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Merge branch 'x86-xen-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'x86-xen-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (42 commits)
  xen: cache cr0 value to avoid trap'n'emulate for read_cr0
  xen/x86-64: clean up warnings about IST-using traps
  xen/x86-64: fix breakpoints and hardware watchpoints
  xen: reserve Xen start_info rather than e820 reserving
  xen: add FIX_TEXT_POKE to fixmap
  lguest: update lazy mmu changes to match lguest's use of kvm hypercalls
  xen: honour VCPU availability on boot
  xen: add "capabilities" file
  xen: drop kexec bits from /sys/hypervisor since kexec isn't implemented yet
  xen/sys/hypervisor: change writable_pt to features
  xen: add /sys/hypervisor support
  xen/xenbus: export xenbus_dev_changed
  xen: use device model for suspending xenbus devices
  xen: remove suspend_cancel hook
  xen/dev-evtchn: clean up locking in evtchn
  xen: export ioctl headers to userspace
  xen: add /dev/xen/evtchn driver
  xen: add irq_from_evtchn
  xen: clean up gate trap/interrupt constants
  xen: set _PAGE_NX in __supported_pte_mask before pagetable construction
  ...
This commit is contained in:
Linus Torvalds 2009-06-10 16:16:27 -07:00
parent 595dc54a1d a789ed5fb6
commit be15f9d63b
37 changed files with 1281 additions and 174 deletions
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22
arch/x86/include/asm/paravirt.h
View File

@ -56,6 +56,7 @@ struct desc_ptr;
struct tss_struct;
struct mm_struct;
struct desc_struct;
struct task_struct;
/*
* Wrapper type for pointers to code which uses the non-standard
@ -203,7 +204,8 @@ struct pv_cpu_ops {
void (*swapgs)(void);
struct pv_lazy_ops lazy_mode;
void (*start_context_switch)(struct task_struct *prev);
void (*end_context_switch)(struct task_struct *next);
};
struct pv_irq_ops {
@ -1399,25 +1401,23 @@ enum paravirt_lazy_mode {
};
enum paravirt_lazy_mode paravirt_get_lazy_mode(void);
void paravirt_enter_lazy_cpu(void);
void paravirt_leave_lazy_cpu(void);
void paravirt_start_context_switch(struct task_struct *prev);
void paravirt_end_context_switch(struct task_struct *next);
void paravirt_enter_lazy_mmu(void);
void paravirt_leave_lazy_mmu(void);
void paravirt_leave_lazy(enum paravirt_lazy_mode mode);
#define __HAVE_ARCH_ENTER_LAZY_CPU_MODE
static inline void arch_enter_lazy_cpu_mode(void)
#define __HAVE_ARCH_START_CONTEXT_SWITCH
static inline void arch_start_context_switch(struct task_struct *prev)
{
PVOP_VCALL0(pv_cpu_ops.lazy_mode.enter);
PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
}
static inline void arch_leave_lazy_cpu_mode(void)
static inline void arch_end_context_switch(struct task_struct *next)
{
PVOP_VCALL0(pv_cpu_ops.lazy_mode.leave);
PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
}
void arch_flush_lazy_cpu_mode(void);
#define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
static inline void arch_enter_lazy_mmu_mode(void)
{

2
arch/x86/include/asm/pgtable.h
View File

@ -81,6 +81,8 @@ static inline void __init paravirt_pagetable_setup_done(pgd_t *base)
#define pte_val(x) native_pte_val(x)
#define __pte(x) native_make_pte(x)
#define arch_end_context_switch(prev) do {} while(0)
#endif /* CONFIG_PARAVIRT */
/*

8
arch/x86/include/asm/required-features.h
View File

@ -48,9 +48,15 @@
#endif
#ifdef CONFIG_X86_64
#ifdef CONFIG_PARAVIRT
/* Paravirtualized systems may not have PSE or PGE available */
#define NEED_PSE 0
#define NEED_MSR (1<<(X86_FEATURE_MSR & 31))
#define NEED_PGE 0
#else
#define NEED_PSE (1<<(X86_FEATURE_PSE) & 31)
#define NEED_PGE (1<<(X86_FEATURE_PGE) & 31)
#endif
#define NEED_MSR (1<<(X86_FEATURE_MSR & 31))
#define NEED_FXSR (1<<(X86_FEATURE_FXSR & 31))
#define NEED_XMM (1<<(X86_FEATURE_XMM & 31))
#define NEED_XMM2 (1<<(X86_FEATURE_XMM2 & 31))

4
arch/x86/include/asm/thread_info.h
View File

@ -94,7 +94,8 @@ struct thread_info {
#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
#define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */
#define TIF_DS_AREA_MSR 26 /* uses thread_struct.ds_area_msr */
#define TIF_SYSCALL_FTRACE 27 /* for ftrace syscall instrumentation */
#define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */
#define TIF_SYSCALL_FTRACE 28 /* for ftrace syscall instrumentation */
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
@ -116,6 +117,7 @@ struct thread_info {
#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
#define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR)
#define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR)
#define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES)
#define _TIF_SYSCALL_FTRACE (1 << TIF_SYSCALL_FTRACE)
/* work to do in syscall_trace_enter() */

3
arch/x86/include/asm/traps.h
View File

@ -14,6 +14,9 @@ asmlinkage void divide_error(void);
asmlinkage void debug(void);
asmlinkage void nmi(void);
asmlinkage void int3(void);
asmlinkage void xen_debug(void);
asmlinkage void xen_int3(void);
asmlinkage void xen_stack_segment(void);
asmlinkage void overflow(void);
asmlinkage void bounds(void);
asmlinkage void invalid_op(void);

5
arch/x86/kernel/entry_64.S
View File

@ -1379,6 +1379,11 @@ END(xen_failsafe_callback)
paranoidzeroentry_ist debug do_debug DEBUG_STACK
paranoidzeroentry_ist int3 do_int3 DEBUG_STACK
paranoiderrorentry stack_segment do_stack_segment
#ifdef CONFIG_XEN
zeroentry xen_debug do_debug
zeroentry xen_int3 do_int3
errorentry xen_stack_segment do_stack_segment
#endif
errorentry general_protection do_general_protection
errorentry page_fault do_page_fault
#ifdef CONFIG_X86_MCE

2
arch/x86/kernel/kvm.c
View File

@ -195,7 +195,7 @@ static void kvm_leave_lazy_mmu(void)
struct kvm_para_state *state = kvm_para_state();
mmu_queue_flush(state);
paravirt_leave_lazy(paravirt_get_lazy_mode());
paravirt_leave_lazy_mmu();
state->mode = paravirt_get_lazy_mode();
}

56
arch/x86/kernel/paravirt.c
View File

@ -248,18 +248,16 @@ static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LA
static inline void enter_lazy(enum paravirt_lazy_mode mode)
{
BUG_ON(__get_cpu_var(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
BUG_ON(preemptible());
BUG_ON(percpu_read(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
__get_cpu_var(paravirt_lazy_mode) = mode;
percpu_write(paravirt_lazy_mode, mode);
}
void paravirt_leave_lazy(enum paravirt_lazy_mode mode)
static void leave_lazy(enum paravirt_lazy_mode mode)
{
BUG_ON(__get_cpu_var(paravirt_lazy_mode) != mode);
BUG_ON(preemptible());
BUG_ON(percpu_read(paravirt_lazy_mode) != mode);
__get_cpu_var(paravirt_lazy_mode) = PARAVIRT_LAZY_NONE;
percpu_write(paravirt_lazy_mode, PARAVIRT_LAZY_NONE);
}
void paravirt_enter_lazy_mmu(void)
@ -269,22 +267,36 @@ void paravirt_enter_lazy_mmu(void)
void paravirt_leave_lazy_mmu(void)
{
paravirt_leave_lazy(PARAVIRT_LAZY_MMU);
leave_lazy(PARAVIRT_LAZY_MMU);
}
void paravirt_enter_lazy_cpu(void)
void paravirt_start_context_switch(struct task_struct *prev)
{
BUG_ON(preemptible());
if (percpu_read(paravirt_lazy_mode) == PARAVIRT_LAZY_MMU) {
arch_leave_lazy_mmu_mode();
set_ti_thread_flag(task_thread_info(prev), TIF_LAZY_MMU_UPDATES);
}
enter_lazy(PARAVIRT_LAZY_CPU);
}
void paravirt_leave_lazy_cpu(void)
void paravirt_end_context_switch(struct task_struct *next)
{
paravirt_leave_lazy(PARAVIRT_LAZY_CPU);
BUG_ON(preemptible());
leave_lazy(PARAVIRT_LAZY_CPU);
if (test_and_clear_ti_thread_flag(task_thread_info(next), TIF_LAZY_MMU_UPDATES))
arch_enter_lazy_mmu_mode();
}
enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
{
return __get_cpu_var(paravirt_lazy_mode);
if (in_interrupt())
return PARAVIRT_LAZY_NONE;
return percpu_read(paravirt_lazy_mode);
}
void arch_flush_lazy_mmu_mode(void)
@ -292,7 +304,6 @@ void arch_flush_lazy_mmu_mode(void)
preempt_disable();
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
WARN_ON(preempt_count() == 1);
arch_leave_lazy_mmu_mode();
arch_enter_lazy_mmu_mode();
}
@ -300,19 +311,6 @@ void arch_flush_lazy_mmu_mode(void)
preempt_enable();
}
void arch_flush_lazy_cpu_mode(void)
{
preempt_disable();
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_CPU) {
WARN_ON(preempt_count() == 1);
arch_leave_lazy_cpu_mode();
arch_enter_lazy_cpu_mode();
}
preempt_enable();
}
struct pv_info pv_info = {
.name = "bare hardware",
.paravirt_enabled = 0,
@ -404,10 +402,8 @@ struct pv_cpu_ops pv_cpu_ops = {
.set_iopl_mask = native_set_iopl_mask,
.io_delay = native_io_delay,
.lazy_mode = {
.enter = paravirt_nop,
.leave = paravirt_nop,
},
.start_context_switch = paravirt_nop,
.end_context_switch = paravirt_nop,
};
struct pv_apic_ops pv_apic_ops = {

2
arch/x86/kernel/process_32.c
View File

@ -404,7 +404,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
* done before math_state_restore, so the TS bit is up
* to date.
*/
arch_leave_lazy_cpu_mode();
arch_end_context_switch(next_p);
/* If the task has used fpu the last 5 timeslices, just do a full
* restore of the math state immediately to avoid the trap; the

2
arch/x86/kernel/process_64.c
View File

@ -425,7 +425,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
* done before math_state_restore, so the TS bit is up
* to date.
*/
arch_leave_lazy_cpu_mode();
arch_end_context_switch(next_p);
/*
* Switch FS and GS.

20
arch/x86/kernel/vmi_32.c
View File

@ -462,22 +462,28 @@ vmi_startup_ipi_hook(int phys_apicid, unsigned long start_eip,
}
#endif
static void vmi_enter_lazy_cpu(void)
static void vmi_start_context_switch(struct task_struct *prev)
{
paravirt_enter_lazy_cpu();
paravirt_start_context_switch(prev);
vmi_ops.set_lazy_mode(2);
}
static void vmi_end_context_switch(struct task_struct *next)
{
vmi_ops.set_lazy_mode(0);
paravirt_end_context_switch(next);
}
static void vmi_enter_lazy_mmu(void)
{
paravirt_enter_lazy_mmu();
vmi_ops.set_lazy_mode(1);
}
static void vmi_leave_lazy(void)
static void vmi_leave_lazy_mmu(void)
{
paravirt_leave_lazy(paravirt_get_lazy_mode());
vmi_ops.set_lazy_mode(0);
paravirt_leave_lazy_mmu();
}
static inline int __init check_vmi_rom(struct vrom_header *rom)
@ -711,14 +717,14 @@ static inline int __init activate_vmi(void)
para_fill(pv_cpu_ops.set_iopl_mask, SetIOPLMask);
para_fill(pv_cpu_ops.io_delay, IODelay);
para_wrap(pv_cpu_ops.lazy_mode.enter, vmi_enter_lazy_cpu,
para_wrap(pv_cpu_ops.start_context_switch, vmi_start_context_switch,
set_lazy_mode, SetLazyMode);
para_wrap(pv_cpu_ops.lazy_mode.leave, vmi_leave_lazy,
para_wrap(pv_cpu_ops.end_context_switch, vmi_end_context_switch,
set_lazy_mode, SetLazyMode);
para_wrap(pv_mmu_ops.lazy_mode.enter, vmi_enter_lazy_mmu,
set_lazy_mode, SetLazyMode);
para_wrap(pv_mmu_ops.lazy_mode.leave, vmi_leave_lazy,
para_wrap(pv_mmu_ops.lazy_mode.leave, vmi_leave_lazy_mmu,
set_lazy_mode, SetLazyMode);
/* user and kernel flush are just handled with different flags to FlushTLB */

16
arch/x86/lguest/boot.c
View File

@ -167,10 +167,16 @@ static void lazy_hcall3(unsigned long call,
/* When lazy mode is turned off reset the per-cpu lazy mode variable and then
* issue the do-nothing hypercall to flush any stored calls. */
static void lguest_leave_lazy_mode(void)
static void lguest_leave_lazy_mmu_mode(void)
{
paravirt_leave_lazy(paravirt_get_lazy_mode());
kvm_hypercall0(LHCALL_FLUSH_ASYNC);
paravirt_leave_lazy_mmu();
}
static void lguest_end_context_switch(struct task_struct *next)
{
kvm_hypercall0(LHCALL_FLUSH_ASYNC);
paravirt_end_context_switch(next);
}
/*G:033
@ -1054,8 +1060,8 @@ __init void lguest_init(void)
pv_cpu_ops.write_gdt_entry = lguest_write_gdt_entry;
pv_cpu_ops.write_idt_entry = lguest_write_idt_entry;
pv_cpu_ops.wbinvd = lguest_wbinvd;
pv_cpu_ops.lazy_mode.enter = paravirt_enter_lazy_cpu;
pv_cpu_ops.lazy_mode.leave = lguest_leave_lazy_mode;
pv_cpu_ops.start_context_switch = paravirt_start_context_switch;
pv_cpu_ops.end_context_switch = lguest_end_context_switch;
/* pagetable management */
pv_mmu_ops.write_cr3 = lguest_write_cr3;
@ -1068,7 +1074,7 @@ __init void lguest_init(void)
pv_mmu_ops.read_cr2 = lguest_read_cr2;
pv_mmu_ops.read_cr3 = lguest_read_cr3;
pv_mmu_ops.lazy_mode.enter = paravirt_enter_lazy_mmu;
pv_mmu_ops.lazy_mode.leave = lguest_leave_lazy_mode;
pv_mmu_ops.lazy_mode.leave = lguest_leave_lazy_mmu_mode;
pv_mmu_ops.pte_update = lguest_pte_update;
pv_mmu_ops.pte_update_defer = lguest_pte_update;

6
arch/x86/mm/fault.c
View File

@ -201,12 +201,10 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
if (!pmd_present(*pmd_k))
return NULL;
if (!pmd_present(*pmd)) {
if (!pmd_present(*pmd))
set_pmd(pmd, *pmd_k);
arch_flush_lazy_mmu_mode();
} else {
else
BUG_ON(pmd_page(*pmd) != pmd_page(*pmd_k));
}
return pmd_k;
}

2
arch/x86/mm/highmem_32.c
View File

@ -44,7 +44,6 @@ void *kmap_atomic_prot(struct page *page, enum km_type type, pgprot_t prot)
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
BUG_ON(!pte_none(*(kmap_pte-idx)));
set_pte(kmap_pte-idx, mk_pte(page, prot));
arch_flush_lazy_mmu_mode();
return (void *)vaddr;
}
@ -74,7 +73,6 @@ void kunmap_atomic(void *kvaddr, enum km_type type)
#endif
}
arch_flush_lazy_mmu_mode();
pagefault_enable();
}

1
arch/x86/mm/iomap_32.c
View File

@ -82,7 +82,6 @@ iounmap_atomic(void *kvaddr, enum km_type type)
if (vaddr == __fix_to_virt(FIX_KMAP_BEGIN+idx))
kpte_clear_flush(kmap_pte-idx, vaddr);
arch_flush_lazy_mmu_mode();
pagefault_enable();
}
EXPORT_SYMBOL_GPL(iounmap_atomic);

14
arch/x86/mm/pageattr.c
View File

@ -839,13 +839,6 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
vm_unmap_aliases();
/*
* If we're called with lazy mmu updates enabled, the
* in-memory pte state may be stale. Flush pending updates to
* bring them up to date.
*/
arch_flush_lazy_mmu_mode();
cpa.vaddr = addr;
cpa.pages = pages;
cpa.numpages = numpages;
@ -890,13 +883,6 @@ static int change_page_attr_set_clr(unsigned long *addr, int numpages,
} else
cpa_flush_all(cache);
/*
* If we've been called with lazy mmu updates enabled, then
* make sure that everything gets flushed out before we
* return.
*/
arch_flush_lazy_mmu_mode();
out:
return ret;
}

65
arch/x86/xen/enlighten.c
View File

@ -20,6 +20,7 @@
#include <linux/delay.h>
#include <linux/start_kernel.h>
#include <linux/sched.h>
#include <linux/kprobes.h>
#include <linux/bootmem.h>
#include <linux/module.h>
#include <linux/mm.h>
@ -44,6 +45,7 @@
#include <asm/processor.h>
#include <asm/proto.h>
#include <asm/msr-index.h>
#include <asm/traps.h>
#include <asm/setup.h>
#include <asm/desc.h>
#include <asm/pgtable.h>
@ -240,10 +242,10 @@ static unsigned long xen_get_debugreg(int reg)
return HYPERVISOR_get_debugreg(reg);
}
void xen_leave_lazy(void)
static void xen_end_context_switch(struct task_struct *next)
{
paravirt_leave_lazy(paravirt_get_lazy_mode());
xen_mc_flush();
paravirt_end_context_switch(next);
}
static unsigned long xen_store_tr(void)
@ -428,11 +430,44 @@ static void xen_write_ldt_entry(struct desc_struct *dt, int entrynum,
static int cvt_gate_to_trap(int vector, const gate_desc *val,
struct trap_info *info)
{
unsigned long addr;
if (val->type != GATE_TRAP && val->type != GATE_INTERRUPT)
return 0;
info->vector = vector;
info->address = gate_offset(*val);
addr = gate_offset(*val);
#ifdef CONFIG_X86_64
/*
* Look for known traps using IST, and substitute them
* appropriately. The debugger ones are the only ones we care
* about. Xen will handle faults like double_fault and
* machine_check, so we should never see them. Warn if
* there's an unexpected IST-using fault handler.
*/
if (addr == (unsigned long)debug)
addr = (unsigned long)xen_debug;
else if (addr == (unsigned long)int3)
addr = (unsigned long)xen_int3;
else if (addr == (unsigned long)stack_segment)
addr = (unsigned long)xen_stack_segment;
else if (addr == (unsigned long)double_fault ||
addr == (unsigned long)nmi) {
/* Don't need to handle these */
return 0;
#ifdef CONFIG_X86_MCE
} else if (addr == (unsigned long)machine_check) {
return 0;
#endif
} else {
/* Some other trap using IST? */
if (WARN_ON(val->ist != 0))
return 0;
}
#endif /* CONFIG_X86_64 */
info->address = addr;
info->cs = gate_segment(*val);
info->flags = val->dpl;
/* interrupt gates clear IF */
@ -623,10 +658,26 @@ static void xen_clts(void)
xen_mc_issue(PARAVIRT_LAZY_CPU);
}
static DEFINE_PER_CPU(unsigned long, xen_cr0_value);
static unsigned long xen_read_cr0(void)
{
unsigned long cr0 = percpu_read(xen_cr0_value);
if (unlikely(cr0 == 0)) {
cr0 = native_read_cr0();
percpu_write(xen_cr0_value, cr0);
}
return cr0;
}
static void xen_write_cr0(unsigned long cr0)
{
struct multicall_space mcs;
percpu_write(xen_cr0_value, cr0);
/* Only pay attention to cr0.TS; everything else is
ignored. */
mcs = xen_mc_entry(0);
@ -812,7 +863,7 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
.clts = xen_clts,
.read_cr0 = native_read_cr0,
.read_cr0 = xen_read_cr0,
.write_cr0 = xen_write_cr0,
.read_cr4 = native_read_cr4,
@ -860,10 +911,8 @@ static const struct pv_cpu_ops xen_cpu_ops __initdata = {
/* Xen takes care of %gs when switching to usermode for us */
.swapgs = paravirt_nop,
.lazy_mode = {
.enter = paravirt_enter_lazy_cpu,
.leave = xen_leave_lazy,
},
.start_context_switch = paravirt_start_context_switch,
.end_context_switch = xen_end_context_switch,
};
static const struct pv_apic_ops xen_apic_ops __initdata = {

23
arch/x86/xen/mmu.c
View File

@ -452,10 +452,6 @@ void set_pte_mfn(unsigned long vaddr, unsigned long mfn, pgprot_t flags)
void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pteval)
{
/* updates to init_mm may be done without lock */
if (mm == &init_mm)
preempt_disable();
ADD_STATS(set_pte_at, 1);
// ADD_STATS(set_pte_at_pinned, xen_page_pinned(ptep));
ADD_STATS(set_pte_at_current, mm == current->mm);
@ -476,9 +472,7 @@ void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
}
xen_set_pte(ptep, pteval);
out:
if (mm == &init_mm)
preempt_enable();
out: return;
}
pte_t xen_ptep_modify_prot_start(struct mm_struct *mm,
@ -1152,10 +1146,8 @@ static void drop_other_mm_ref(void *info)
/* If this cpu still has a stale cr3 reference, then make sure
it has been flushed. */
if (percpu_read(xen_current_cr3) == __pa(mm->pgd)) {
if (percpu_read(xen_current_cr3) == __pa(mm->pgd))
load_cr3(swapper_pg_dir);
arch_flush_lazy_cpu_mode();
}
}
static void xen_drop_mm_ref(struct mm_struct *mm)
@ -1168,7 +1160,6 @@ static void xen_drop_mm_ref(struct mm_struct *mm)
load_cr3(swapper_pg_dir);
else
leave_mm(smp_processor_id());
arch_flush_lazy_cpu_mode();
}
/* Get the "official" set of cpus referring to our pagetable. */
@ -1876,6 +1867,14 @@ __init void xen_post_allocator_init(void)
xen_mark_init_mm_pinned();
}
static void xen_leave_lazy_mmu(void)
{
preempt_disable();
xen_mc_flush();
paravirt_leave_lazy_mmu();
preempt_enable();
}
const struct pv_mmu_ops xen_mmu_ops __initdata = {
.pagetable_setup_start = xen_pagetable_setup_start,
.pagetable_setup_done = xen_pagetable_setup_done,
@ -1949,7 +1948,7 @@ const struct pv_mmu_ops xen_mmu_ops __initdata = {
.lazy_mode = {
.enter = paravirt_enter_lazy_mmu,
.leave = xen_leave_lazy,
.leave = xen_leave_lazy_mmu,
},
.set_fixmap = xen_set_fixmap,

6
arch/x86/xen/setup.c
View File

@ -61,9 +61,9 @@ char * __init xen_memory_setup(void)
* - xen_start_info
* See comment above "struct start_info" in <xen/interface/xen.h>
*/
e820_add_region(__pa(xen_start_info->mfn_list),
xen_start_info->pt_base - xen_start_info->mfn_list,
E820_RESERVED);
reserve_early(__pa(xen_start_info->mfn_list),
__pa(xen_start_info->pt_base),
"XEN START INFO");
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);

1
arch/x86/xen/xen-ops.h
View File

@ -30,7 +30,6 @@ pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd, unsigned long max_pfn);
void xen_ident_map_ISA(void);
void xen_reserve_top(void);
void xen_leave_lazy(void);
void xen_post_allocator_init(void);
char * __init xen_memory_setup(void);

20
drivers/xen/Kconfig
View File

@ -18,6 +18,16 @@ config XEN_SCRUB_PAGES
secure, but slightly less efficient.
If in doubt, say yes.
config XEN_DEV_EVTCHN
tristate "Xen /dev/xen/evtchn device"
depends on XEN
default y
help
The evtchn driver allows a userspace process to triger event
channels and to receive notification of an event channel
firing.
If in doubt, say yes.
config XENFS
tristate "Xen filesystem"
depends on XEN
@ -41,3 +51,13 @@ config XEN_COMPAT_XENFS
a xen platform.
If in doubt, say yes.
config XEN_SYS_HYPERVISOR
bool "Create xen entries under /sys/hypervisor"
depends on XEN && SYSFS
select SYS_HYPERVISOR
default y
help
Create entries under /sys/hypervisor describing the Xen
hypervisor environment. When running native or in another
virtual environment, /sys/hypervisor will still be present,
but will have no xen contents.

2
drivers/xen/Makefile
View File

@ -4,4 +4,6 @@ obj-y += xenbus/
obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o
obj-$(CONFIG_XEN_XENCOMM) += xencomm.o
obj-$(CONFIG_XEN_BALLOON) += balloon.o
obj-$(CONFIG_XEN_DEV_EVTCHN) += evtchn.o
obj-$(CONFIG_XENFS) += xenfs/
obj-$(CONFIG_XEN_SYS_HYPERVISOR) += sys-hypervisor.o

6
drivers/xen/events.c
View File

@ -151,6 +151,12 @@ static unsigned int evtchn_from_irq(unsigned irq)
return info_for_irq(irq)->evtchn;
}
unsigned irq_from_evtchn(unsigned int evtchn)
{
return evtchn_to_irq[evtchn];
}
EXPORT_SYMBOL_GPL(irq_from_evtchn);
static enum ipi_vector ipi_from_irq(unsigned irq)
{
struct irq_info *info = info_for_irq(irq);

507
drivers/xen/evtchn.c Normal file
View File

@ -0,0 +1,507 @@
/******************************************************************************
* evtchn.c
*
* Driver for receiving and demuxing event-channel signals.
*
* Copyright (c) 2004-2005, K A Fraser
* Multi-process extensions Copyright (c) 2004, Steven Smith
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/major.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/poll.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/gfp.h>
#include <linux/mutex.h>
#include <linux/cpu.h>
#include <xen/events.h>
#include <xen/evtchn.h>
#include <asm/xen/hypervisor.h>
struct per_user_data {
struct mutex bind_mutex; /* serialize bind/unbind operations */
/* Notification ring, accessed via /dev/xen/evtchn. */
#define EVTCHN_RING_SIZE (PAGE_SIZE / sizeof(evtchn_port_t))
#define EVTCHN_RING_MASK(_i) ((_i)&(EVTCHN_RING_SIZE-1))
evtchn_port_t *ring;
unsigned int ring_cons, ring_prod, ring_overflow;
struct mutex ring_cons_mutex; /* protect against concurrent readers */
/* Processes wait on this queue when ring is empty. */
wait_queue_head_t evtchn_wait;
struct fasync_struct *evtchn_async_queue;
const char *name;
};
/* Who's bound to each port? */
static struct per_user_data *port_user[NR_EVENT_CHANNELS];
static DEFINE_SPINLOCK(port_user_lock); /* protects port_user[] and ring_prod */
irqreturn_t evtchn_interrupt(int irq, void *data)
{
unsigned int port = (unsigned long)data;
struct per_user_data *u;
spin_lock(&port_user_lock);
u = port_user[port];
disable_irq_nosync(irq);
if ((u->ring_prod - u->ring_cons) < EVTCHN_RING_SIZE) {
u->ring[EVTCHN_RING_MASK(u->ring_prod)] = port;
wmb(); /* Ensure ring contents visible */
if (u->ring_cons == u->ring_prod++) {
wake_up_interruptible(&u->evtchn_wait);
kill_fasync(&u->evtchn_async_queue,
SIGIO, POLL_IN);
}
} else {
u->ring_overflow = 1;
}
spin_unlock(&port_user_lock);
return IRQ_HANDLED;
}
static ssize_t evtchn_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
int rc;
unsigned int c, p, bytes1 = 0, bytes2 = 0;
struct per_user_data *u = file->private_data;
/* Whole number of ports. */
count &= ~(sizeof(evtchn_port_t)-1);
if (count == 0)
return 0;
if (count > PAGE_SIZE)
count = PAGE_SIZE;
for (;;) {
mutex_lock(&u->ring_cons_mutex);
rc = -EFBIG;
if (u->ring_overflow)
goto unlock_out;
c = u->ring_cons;
p = u->ring_prod;
if (c != p)
break;
mutex_unlock(&u->ring_cons_mutex);
if (file->f_flags & O_NONBLOCK)
return -EAGAIN;
rc = wait_event_interruptible(u->evtchn_wait,
u->ring_cons != u->ring_prod);
if (rc)
return rc;
}
/* Byte lengths of two chunks. Chunk split (if any) is at ring wrap. */
if (((c ^ p) & EVTCHN_RING_SIZE) != 0) {
bytes1 = (EVTCHN_RING_SIZE - EVTCHN_RING_MASK(c)) *
sizeof(evtchn_port_t);
bytes2 = EVTCHN_RING_MASK(p) * sizeof(evtchn_port_t);
} else {
bytes1 = (p - c) * sizeof(evtchn_port_t);
bytes2 = 0;
}
/* Truncate chunks according to caller's maximum byte count. */
if (bytes1 > count) {
bytes1 = count;
bytes2 = 0;
} else if ((bytes1 + bytes2) > count) {
bytes2 = count - bytes1;
}
rc = -EFAULT;
rmb(); /* Ensure that we see the port before we copy it. */
if (copy_to_user(buf, &u->ring[EVTCHN_RING_MASK(c)], bytes1) ||
((bytes2 != 0) &&
copy_to_user(&buf[bytes1], &u->ring[0], bytes2)))
goto unlock_out;
u->ring_cons += (bytes1 + bytes2) / sizeof(evtchn_port_t);
rc = bytes1 + bytes2;
unlock_out:
mutex_unlock(&u->ring_cons_mutex);
return rc;
}
static ssize_t evtchn_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
int rc, i;
evtchn_port_t *kbuf = (evtchn_port_t *)__get_free_page(GFP_KERNEL);
struct per_user_data *u = file->private_data;
if (kbuf == NULL)
return -ENOMEM;
/* Whole number of ports. */
count &= ~(sizeof(evtchn_port_t)-1);
rc = 0;
if (count == 0)
goto out;
if (count > PAGE_SIZE)
count = PAGE_SIZE;
rc = -EFAULT;
if (copy_from_user(kbuf, buf, count) != 0)
goto out;
spin_lock_irq(&port_user_lock);
for (i = 0; i < (count/sizeof(evtchn_port_t)); i++)
if ((kbuf[i] < NR_EVENT_CHANNELS) && (port_user[kbuf[i]] == u))
enable_irq(irq_from_evtchn(kbuf[i]));
spin_unlock_irq(&port_user_lock);
rc = count;
out:
free_page((unsigned long)kbuf);
return rc;
}
static int evtchn_bind_to_user(struct per_user_data *u, int port)
{
int rc = 0;
/*
* Ports are never reused, so every caller should pass in a
* unique port.
*
* (Locking not necessary because we haven't registered the
* interrupt handler yet, and our caller has already
* serialized bind operations.)
*/
BUG_ON(port_user[port] != NULL);
port_user[port] = u;
rc = bind_evtchn_to_irqhandler(port, evtchn_interrupt, IRQF_DISABLED,
u->name, (void *)(unsigned long)port);
if (rc >= 0)
rc = 0;
return rc;
}
static void evtchn_unbind_from_user(struct per_user_data *u, int port)
{
int irq = irq_from_evtchn(port);
unbind_from_irqhandler(irq, (void *)(unsigned long)port);
/* make sure we unbind the irq handler before clearing the port */
barrier();
port_user[port] = NULL;
}
static long evtchn_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
int rc;
struct per_user_data *u = file->private_data;
void __user *uarg = (void __user *) arg;
/* Prevent bind from racing with unbind */
mutex_lock(&u->bind_mutex);
switch (cmd) {
case IOCTL_EVTCHN_BIND_VIRQ: {
struct ioctl_evtchn_bind_virq bind;
struct evtchn_bind_virq bind_virq;
rc = -EFAULT;
if (copy_from_user(&bind, uarg, sizeof(bind)))
break;
bind_virq.virq = bind.virq;
bind_virq.vcpu = 0;
rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_virq,
&bind_virq);
if (rc != 0)
break;
rc = evtchn_bind_to_user(u, bind_virq.port);
if (rc == 0)
rc = bind_virq.port;
break;
}
case IOCTL_EVTCHN_BIND_INTERDOMAIN: {
struct ioctl_evtchn_bind_interdomain bind;
struct evtchn_bind_interdomain bind_interdomain;
rc = -EFAULT;
if (copy_from_user(&bind, uarg, sizeof(bind)))
break;
bind_interdomain.remote_dom = bind.remote_domain;
bind_interdomain.remote_port = bind.remote_port;
rc = HYPERVISOR_event_channel_op(EVTCHNOP_bind_interdomain,
&bind_interdomain);
if (rc != 0)
break;
rc = evtchn_bind_to_user(u, bind_interdomain.local_port);
if (rc == 0)
rc = bind_interdomain.local_port;
break;
}
case IOCTL_EVTCHN_BIND_UNBOUND_PORT: {
struct ioctl_evtchn_bind_unbound_port bind;
struct evtchn_alloc_unbound alloc_unbound;
rc = -EFAULT;
if (copy_from_user(&bind, uarg, sizeof(bind)))
break;
alloc_unbound.dom = DOMID_SELF;
alloc_unbound.remote_dom = bind.remote_domain;
rc = HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound,
&alloc_unbound);
if (rc != 0)
break;
rc = evtchn_bind_to_user(u, alloc_unbound.port);
if (rc == 0)
rc = alloc_unbound.port;
break;
}
case IOCTL_EVTCHN_UNBIND: {
struct ioctl_evtchn_unbind unbind;
rc = -EFAULT;
if (copy_from_user(&unbind, uarg, sizeof(unbind)))
break;
rc = -EINVAL;
if (unbind.port >= NR_EVENT_CHANNELS)
break;
spin_lock_irq(&port_user_lock);
rc = -ENOTCONN;
if (port_user[unbind.port] != u) {
spin_unlock_irq(&port_user_lock);
break;
}
evtchn_unbind_from_user(u, unbind.port);
spin_unlock_irq(&port_user_lock);
rc = 0;
break;
}
case IOCTL_EVTCHN_NOTIFY: {
struct ioctl_evtchn_notify notify;
rc = -EFAULT;
if (copy_from_user(&notify, uarg, sizeof(notify)))
break;
if (notify.port >= NR_EVENT_CHANNELS) {
rc = -EINVAL;
} else if (port_user[notify.port] != u) {
rc = -ENOTCONN;
} else {
notify_remote_via_evtchn(notify.port);
rc = 0;
}
break;
}
case IOCTL_EVTCHN_RESET: {
/* Initialise the ring to empty. Clear errors. */
mutex_lock(&u->ring_cons_mutex);
spin_lock_irq(&port_user_lock);
u->ring_cons = u->ring_prod = u->ring_overflow = 0;
spin_unlock_irq(&port_user_lock);
mutex_unlock(&u->ring_cons_mutex);
rc = 0;
break;
}
default:
rc = -ENOSYS;
break;
}
mutex_unlock(&u->bind_mutex);
return rc;
}
static unsigned int evtchn_poll(struct file *file, poll_table *wait)
{
unsigned int mask = POLLOUT | POLLWRNORM;
struct per_user_data *u = file->private_data;
poll_wait(file, &u->evtchn_wait, wait);
if (u->ring_cons != u->ring_prod)
mask |= POLLIN | POLLRDNORM;
if (u->ring_overflow)
mask = POLLERR;
return mask;
}
static int evtchn_fasync(int fd, struct file *filp, int on)
{
struct per_user_data *u = filp->private_data;
return fasync_helper(fd, filp, on, &u->evtchn_async_queue);
}
static int evtchn_open(struct inode *inode, struct file *filp)
{
struct per_user_data *u;
u = kzalloc(sizeof(*u), GFP_KERNEL);
if (u == NULL)
return -ENOMEM;
u->name = kasprintf(GFP_KERNEL, "evtchn:%s", current->comm);
if (u->name == NULL) {
kfree(u);
return -ENOMEM;
}
init_waitqueue_head(&u->evtchn_wait);
u->ring = (evtchn_port_t *)__get_free_page(GFP_KERNEL);
if (u->ring == NULL) {
kfree(u->name);
kfree(u);
return -ENOMEM;
}
mutex_init(&u->bind_mutex);
mutex_init(&u->ring_cons_mutex);
filp->private_data = u;
return 0;
}
static int evtchn_release(struct inode *inode, struct file *filp)
{
int i;
struct per_user_data *u = filp->private_data;
spin_lock_irq(&port_user_lock);
free_page((unsigned long)u->ring);
for (i = 0; i < NR_EVENT_CHANNELS; i++) {
if (port_user[i] != u)
continue;
evtchn_unbind_from_user(port_user[i], i);
}
spin_unlock_irq(&port_user_lock);
kfree(u->name);
kfree(u);
return 0;
}
static const struct file_operations evtchn_fops = {
.owner = THIS_MODULE,
.read = evtchn_read,
.write = evtchn_write,
.unlocked_ioctl = evtchn_ioctl,
.poll = evtchn_poll,
.fasync = evtchn_fasync,
.open = evtchn_open,
.release = evtchn_release,
};
static struct miscdevice evtchn_miscdev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "evtchn",
.fops = &evtchn_fops,
};
static int __init evtchn_init(void)
{
int err;
if (!xen_domain())
return -ENODEV;
spin_lock_init(&port_user_lock);
memset(port_user, 0, sizeof(port_user));
/* Create '/dev/misc/evtchn'. */
err = misc_register(&evtchn_miscdev);
if (err != 0) {
printk(KERN_ALERT "Could not register /dev/misc/evtchn\n");
return err;
}
printk(KERN_INFO "Event-channel device installed.\n");
return 0;
}
static void __exit evtchn_cleanup(void)
{
misc_deregister(&evtchn_miscdev);
}
module_init(evtchn_init);
module_exit(evtchn_cleanup);
MODULE_LICENSE("GPL");

9
drivers/xen/manage.c
View File

@ -98,9 +98,8 @@ static void do_suspend(void)
goto out;
}
printk("suspending xenbus...\n");
/* XXX use normal device tree? */
xenbus_suspend();
printk(KERN_DEBUG "suspending xenstore...\n");
xs_suspend();
err = device_power_down(PMSG_SUSPEND);
if (err) {
@ -116,9 +115,9 @@ static void do_suspend(void)
if (!cancelled) {
xen_arch_resume();
xenbus_resume();
xs_resume();
} else
xenbus_suspend_cancel();
xs_suspend_cancel();
device_power_up(PMSG_RESUME);

445
drivers/xen/sys-hypervisor.c Normal file
View File

@ -0,0 +1,445 @@
/*
* copyright (c) 2006 IBM Corporation
* Authored by: Mike D. Day <ncmike@us.ibm.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include <xen/xenbus.h>
#include <xen/interface/xen.h>
#include <xen/interface/version.h>
#define HYPERVISOR_ATTR_RO(_name) \
static struct hyp_sysfs_attr _name##_attr = __ATTR_RO(_name)
#define HYPERVISOR_ATTR_RW(_name) \
static struct hyp_sysfs_attr _name##_attr = \
__ATTR(_name, 0644, _name##_show, _name##_store)
struct hyp_sysfs_attr {
struct attribute attr;
ssize_t (*show)(struct hyp_sysfs_attr *, char *);
ssize_t (*store)(struct hyp_sysfs_attr *, const char *, size_t);
void *hyp_attr_data;
};
static ssize_t type_show(struct hyp_sysfs_attr *attr, char *buffer)
{
return sprintf(buffer, "xen\n");
}
HYPERVISOR_ATTR_RO(type);
static int __init xen_sysfs_type_init(void)
{
return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
}
static void xen_sysfs_type_destroy(void)
{
sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
}
/* xen version attributes */
static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int version = HYPERVISOR_xen_version(XENVER_version, NULL);
if (version)
return sprintf(buffer, "%d\n", version >> 16);
return -ENODEV;
}
HYPERVISOR_ATTR_RO(major);
static ssize_t minor_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int version = HYPERVISOR_xen_version(XENVER_version, NULL);
if (version)
return sprintf(buffer, "%d\n", version & 0xff);
return -ENODEV;
}
HYPERVISOR_ATTR_RO(minor);
static ssize_t extra_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int ret = -ENOMEM;
char *extra;
extra = kmalloc(XEN_EXTRAVERSION_LEN, GFP_KERNEL);
if (extra) {
ret = HYPERVISOR_xen_version(XENVER_extraversion, extra);
if (!ret)
ret = sprintf(buffer, "%s\n", extra);
kfree(extra);
}
return ret;
}
HYPERVISOR_ATTR_RO(extra);
static struct attribute *version_attrs[] = {
&major_attr.attr,
&minor_attr.attr,
&extra_attr.attr,
NULL
};
static struct attribute_group version_group = {
.name = "version",
.attrs = version_attrs,
};
static int __init xen_sysfs_version_init(void)
{
return sysfs_create_group(hypervisor_kobj, &version_group);
}
static void xen_sysfs_version_destroy(void)
{
sysfs_remove_group(hypervisor_kobj, &version_group);
}
/* UUID */
static ssize_t uuid_show(struct hyp_sysfs_attr *attr, char *buffer)
{
char *vm, *val;
int ret;
extern int xenstored_ready;
if (!xenstored_ready)
return -EBUSY;
vm = xenbus_read(XBT_NIL, "vm", "", NULL);
if (IS_ERR(vm))
return PTR_ERR(vm);
val = xenbus_read(XBT_NIL, vm, "uuid", NULL);
kfree(vm);
if (IS_ERR(val))
return PTR_ERR(val);
ret = sprintf(buffer, "%s\n", val);
kfree(val);
return ret;
}
HYPERVISOR_ATTR_RO(uuid);
static int __init xen_sysfs_uuid_init(void)
{
return sysfs_create_file(hypervisor_kobj, &uuid_attr.attr);
}
static void xen_sysfs_uuid_destroy(void)
{
sysfs_remove_file(hypervisor_kobj, &uuid_attr.attr);
}
/* xen compilation attributes */
static ssize_t compiler_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int ret = -ENOMEM;
struct xen_compile_info *info;
info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
if (info) {
ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
if (!ret)
ret = sprintf(buffer, "%s\n", info->compiler);
kfree(info);
}
return ret;
}
HYPERVISOR_ATTR_RO(compiler);
static ssize_t compiled_by_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int ret = -ENOMEM;
struct xen_compile_info *info;
info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
if (info) {
ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
if (!ret)
ret = sprintf(buffer, "%s\n", info->compile_by);
kfree(info);
}
return ret;
}
HYPERVISOR_ATTR_RO(compiled_by);
static ssize_t compile_date_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int ret = -ENOMEM;
struct xen_compile_info *info;
info = kmalloc(sizeof(struct xen_compile_info), GFP_KERNEL);
if (info) {
ret = HYPERVISOR_xen_version(XENVER_compile_info, info);
if (!ret)
ret = sprintf(buffer, "%s\n", info->compile_date);
kfree(info);
}
return ret;
}
HYPERVISOR_ATTR_RO(compile_date);
static struct attribute *xen_compile_attrs[] = {
&compiler_attr.attr,
&compiled_by_attr.attr,
&compile_date_attr.attr,
NULL
};
static struct attribute_group xen_compilation_group = {
.name = "compilation",
.attrs = xen_compile_attrs,
};
int __init static xen_compilation_init(void)
{
return sysfs_create_group(hypervisor_kobj, &xen_compilation_group);
}
static void xen_compilation_destroy(void)
{
sysfs_remove_group(hypervisor_kobj, &xen_compilation_group);
}
/* xen properties info */
static ssize_t capabilities_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int ret = -ENOMEM;
char *caps;
caps = kmalloc(XEN_CAPABILITIES_INFO_LEN, GFP_KERNEL);
if (caps) {
ret = HYPERVISOR_xen_version(XENVER_capabilities, caps);
if (!ret)
ret = sprintf(buffer, "%s\n", caps);
kfree(caps);
}
return ret;
}
HYPERVISOR_ATTR_RO(capabilities);
static ssize_t changeset_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int ret = -ENOMEM;
char *cset;
cset = kmalloc(XEN_CHANGESET_INFO_LEN, GFP_KERNEL);
if (cset) {
ret = HYPERVISOR_xen_version(XENVER_changeset, cset);
if (!ret)
ret = sprintf(buffer, "%s\n", cset);
kfree(cset);
}
return ret;
}
HYPERVISOR_ATTR_RO(changeset);
static ssize_t virtual_start_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int ret = -ENOMEM;
struct xen_platform_parameters *parms;
parms = kmalloc(sizeof(struct xen_platform_parameters), GFP_KERNEL);
if (parms) {
ret = HYPERVISOR_xen_version(XENVER_platform_parameters,
parms);
if (!ret)
ret = sprintf(buffer, "%lx\n", parms->virt_start);
kfree(parms);
}
return ret;
}
HYPERVISOR_ATTR_RO(virtual_start);
static ssize_t pagesize_show(struct hyp_sysfs_attr *attr, char *buffer)
{
int ret;
ret = HYPERVISOR_xen_version(XENVER_pagesize, NULL);
if (ret > 0)
ret = sprintf(buffer, "%x\n", ret);
return ret;
}
HYPERVISOR_ATTR_RO(pagesize);
static ssize_t xen_feature_show(int index, char *buffer)
{
ssize_t ret;
struct xen_feature_info info;
info.submap_idx = index;
ret = HYPERVISOR_xen_version(XENVER_get_features, &info);
if (!ret)
ret = sprintf(buffer, "%08x", info.submap);
return ret;
}
static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
{
ssize_t len;
int i;
len = 0;
for (i = XENFEAT_NR_SUBMAPS-1; i >= 0; i--) {
int ret = xen_feature_show(i, buffer + len);
if (ret < 0) {
if (len == 0)
len = ret;
break;
}
len += ret;
}
if (len > 0)
buffer[len++] = '\n';
return len;
}
HYPERVISOR_ATTR_RO(features);
static struct attribute *xen_properties_attrs[] = {
&capabilities_attr.attr,
&changeset_attr.attr,
&virtual_start_attr.attr,
&pagesize_attr.attr,
&features_attr.attr,
NULL
};
static struct attribute_group xen_properties_group = {
.name = "properties",
.attrs = xen_properties_attrs,
};
static int __init xen_properties_init(void)
{
return sysfs_create_group(hypervisor_kobj, &xen_properties_group);
}
static void xen_properties_destroy(void)
{
sysfs_remove_group(hypervisor_kobj, &xen_properties_group);
}
static int __init hyper_sysfs_init(void)
{
int ret;
if (!xen_domain())
return -ENODEV;
ret = xen_sysfs_type_init();
if (ret)
goto out;
ret = xen_sysfs_version_init();
if (ret)
goto version_out;
ret = xen_compilation_init();
if (ret)
goto comp_out;
ret = xen_sysfs_uuid_init();
if (ret)
goto uuid_out;
ret = xen_properties_init();
if (ret)
goto prop_out;
goto out;
prop_out:
xen_sysfs_uuid_destroy();
uuid_out:
xen_compilation_destroy();
comp_out:
xen_sysfs_version_destroy();
version_out:
xen_sysfs_type_destroy();
out:
return ret;
}
static void __exit hyper_sysfs_exit(void)
{
xen_properties_destroy();
xen_compilation_destroy();
xen_sysfs_uuid_destroy();
xen_sysfs_version_destroy();
xen_sysfs_type_destroy();
}
module_init(hyper_sysfs_init);
module_exit(hyper_sysfs_exit);
static ssize_t hyp_sysfs_show(struct kobject *kobj,
struct attribute *attr,
char *buffer)
{
struct hyp_sysfs_attr *hyp_attr;
hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
if (hyp_attr->show)
return hyp_attr->show(hyp_attr, buffer);
return 0;
}
static ssize_t hyp_sysfs_store(struct kobject *kobj,
struct attribute *attr,
const char *buffer,
size_t len)
{
struct hyp_sysfs_attr *hyp_attr;
hyp_attr = container_of(attr, struct hyp_sysfs_attr, attr);
if (hyp_attr->store)
return hyp_attr->store(hyp_attr, buffer, len);
return 0;
}
static struct sysfs_ops hyp_sysfs_ops = {
.show = hyp_sysfs_show,
.store = hyp_sysfs_store,
};
static struct kobj_type hyp_sysfs_kobj_type = {
.sysfs_ops = &hyp_sysfs_ops,
};
static int __init hypervisor_subsys_init(void)
{
if (!xen_domain())
return -ENODEV;
hypervisor_kobj->ktype = &hyp_sysfs_kobj_type;
return 0;
}
device_initcall(hypervisor_subsys_init);

61
drivers/xen/xenbus/xenbus_probe.c
View File

@ -71,6 +71,9 @@ static int xenbus_probe_frontend(const char *type, const char *name);
static void xenbus_dev_shutdown(struct device *_dev);
static int xenbus_dev_suspend(struct device *dev, pm_message_t state);
static int xenbus_dev_resume(struct device *dev);
/* If something in array of ids matches this device, return it. */
static const struct xenbus_device_id *
match_device(const struct xenbus_device_id *arr, struct xenbus_device *dev)
@ -188,6 +191,9 @@ static struct xen_bus_type xenbus_frontend = {
.remove = xenbus_dev_remove,
.shutdown = xenbus_dev_shutdown,
.dev_attrs = xenbus_dev_attrs,
.suspend = xenbus_dev_suspend,
.resume = xenbus_dev_resume,
},
};
@ -654,6 +660,7 @@ void xenbus_dev_changed(const char *node, struct xen_bus_type *bus)
kfree(root);
}
EXPORT_SYMBOL_GPL(xenbus_dev_changed);
static void frontend_changed(struct xenbus_watch *watch,
const char **vec, unsigned int len)
@ -669,7 +676,7 @@ static struct xenbus_watch fe_watch = {
.callback = frontend_changed,
};
static int suspend_dev(struct device *dev, void *data)
static int xenbus_dev_suspend(struct device *dev, pm_message_t state)
{
int err = 0;
struct xenbus_driver *drv;
@ -682,35 +689,14 @@ static int suspend_dev(struct device *dev, void *data)
drv = to_xenbus_driver(dev->driver);
xdev = container_of(dev, struct xenbus_device, dev);
if (drv->suspend)
err = drv->suspend(xdev);
err = drv->suspend(xdev, state);
if (err)
printk(KERN_WARNING
"xenbus: suspend %s failed: %i\n", dev_name(dev), err);
return 0;
}
static int suspend_cancel_dev(struct device *dev, void *data)
{
int err = 0;
struct xenbus_driver *drv;
struct xenbus_device *xdev;
DPRINTK("");
if (dev->driver == NULL)
return 0;
drv = to_xenbus_driver(dev->driver);
xdev = container_of(dev, struct xenbus_device, dev);
if (drv->suspend_cancel)
err = drv->suspend_cancel(xdev);
if (err)
printk(KERN_WARNING
"xenbus: suspend_cancel %s failed: %i\n",
dev_name(dev), err);
return 0;
}
static int resume_dev(struct device *dev, void *data)
static int xenbus_dev_resume(struct device *dev)
{
int err;
struct xenbus_driver *drv;
@ -755,33 +741,6 @@ static int resume_dev(struct device *dev, void *data)
return 0;
}
void xenbus_suspend(void)
{
DPRINTK("");
bus_for_each_dev(&xenbus_frontend.bus, NULL, NULL, suspend_dev);
xenbus_backend_suspend(suspend_dev);
xs_suspend();
}
EXPORT_SYMBOL_GPL(xenbus_suspend);
void xenbus_resume(void)
{
xb_init_comms();
xs_resume();
bus_for_each_dev(&xenbus_frontend.bus, NULL, NULL, resume_dev);
xenbus_backend_resume(resume_dev);
}
EXPORT_SYMBOL_GPL(xenbus_resume);
void xenbus_suspend_cancel(void)
{
xs_suspend_cancel();
bus_for_each_dev(&xenbus_frontend.bus, NULL, NULL, suspend_cancel_dev);
xenbus_backend_resume(suspend_cancel_dev);
}
EXPORT_SYMBOL_GPL(xenbus_suspend_cancel);
/* A flag to determine if xenstored is 'ready' (i.e. has started) */
int xenstored_ready = 0;

2
drivers/xen/xenbus/xenbus_xs.c
View File

@ -673,6 +673,8 @@ void xs_resume(void)
struct xenbus_watch *watch;
char token[sizeof(watch) * 2 + 1];
xb_init_comms();
mutex_unlock(&xs_state.response_mutex);
mutex_unlock(&xs_state.request_mutex);
up_write(&xs_state.transaction_mutex);

19
drivers/xen/xenfs/super.c
View File

@ -20,10 +20,27 @@
MODULE_DESCRIPTION("Xen filesystem");
MODULE_LICENSE("GPL");
static ssize_t capabilities_read(struct file *file, char __user *buf,
size_t size, loff_t *off)
{
char *tmp = "";
if (xen_initial_domain())
tmp = "control_d\n";
return simple_read_from_buffer(buf, size, off, tmp, strlen(tmp));
}
static const struct file_operations capabilities_file_ops = {
.read = capabilities_read,
};
static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
{
static struct tree_descr xenfs_files[] = {
[2] = {"xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR},
[1] = {},
{ "xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR },
{ "capabilities", &capabilities_file_ops, S_IRUGO },
{""},
};

1
include/Kbuild
View File

@ -8,3 +8,4 @@ header-y += mtd/
header-y += rdma/
header-y += video/
header-y += drm/
header-y += xen/

21
include/asm-generic/pgtable.h
View File

@ -280,17 +280,18 @@ static inline void ptep_modify_prot_commit(struct mm_struct *mm,
#endif
/*
* A facility to provide batching of the reload of page tables with the
* actual context switch code for paravirtualized guests. By convention,
* only one of the lazy modes (CPU, MMU) should be active at any given
* time, entry should never be nested, and entry and exits should always
* be paired. This is for sanity of maintaining and reasoning about the
* kernel code.
* A facility to provide batching of the reload of page tables and
* other process state with the actual context switch code for
* paravirtualized guests. By convention, only one of the batched
* update (lazy) modes (CPU, MMU) should be active at any given time,
* entry should never be nested, and entry and exits should always be
* paired. This is for sanity of maintaining and reasoning about the
* kernel code. In this case, the exit (end of the context switch) is
* in architecture-specific code, and so doesn't need a generic
* definition.
*/
#ifndef __HAVE_ARCH_ENTER_LAZY_CPU_MODE
#define arch_enter_lazy_cpu_mode() do {} while (0)
#define arch_leave_lazy_cpu_mode() do {} while (0)
#define arch_flush_lazy_cpu_mode() do {} while (0)
#ifndef __HAVE_ARCH_START_CONTEXT_SWITCH
#define arch_start_context_switch(prev) do {} while (0)
#endif
#ifndef __HAVE_PFNMAP_TRACKING

1
include/xen/Kbuild Normal file
View File

@ -0,0 +1 @@
header-y += evtchn.h

3
include/xen/events.h
View File

@ -53,4 +53,7 @@ bool xen_test_irq_pending(int irq);
irq will be disabled so it won't deliver an interrupt. */
void xen_poll_irq(int irq);
/* Determine the IRQ which is bound to an event channel */
unsigned irq_from_evtchn(unsigned int evtchn);
#endif /* _XEN_EVENTS_H */

88
include/xen/evtchn.h Normal file
View File

@ -0,0 +1,88 @@
/******************************************************************************
* evtchn.h
*
* Interface to /dev/xen/evtchn.
*
* Copyright (c) 2003-2005, K A Fraser
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef __LINUX_PUBLIC_EVTCHN_H__
#define __LINUX_PUBLIC_EVTCHN_H__
/*
* Bind a fresh port to VIRQ @virq.
* Return allocated port.
*/
#define IOCTL_EVTCHN_BIND_VIRQ \
_IOC(_IOC_NONE, 'E', 0, sizeof(struct ioctl_evtchn_bind_virq))
struct ioctl_evtchn_bind_virq {
unsigned int virq;
};
/*
* Bind a fresh port to remote <@remote_domain, @remote_port>.
* Return allocated port.
*/
#define IOCTL_EVTCHN_BIND_INTERDOMAIN \
_IOC(_IOC_NONE, 'E', 1, sizeof(struct ioctl_evtchn_bind_interdomain))
struct ioctl_evtchn_bind_interdomain {
unsigned int remote_domain, remote_port;
};
/*
* Allocate a fresh port for binding to @remote_domain.
* Return allocated port.
*/
#define IOCTL_EVTCHN_BIND_UNBOUND_PORT \
_IOC(_IOC_NONE, 'E', 2, sizeof(struct ioctl_evtchn_bind_unbound_port))
struct ioctl_evtchn_bind_unbound_port {
unsigned int remote_domain;
};
/*
* Unbind previously allocated @port.
*/
#define IOCTL_EVTCHN_UNBIND \
_IOC(_IOC_NONE, 'E', 3, sizeof(struct ioctl_evtchn_unbind))
struct ioctl_evtchn_unbind {
unsigned int port;
};
/*
* Unbind previously allocated @port.
*/
#define IOCTL_EVTCHN_NOTIFY \
_IOC(_IOC_NONE, 'E', 4, sizeof(struct ioctl_evtchn_notify))
struct ioctl_evtchn_notify {
unsigned int port;
};
/* Clear and reinitialise the event buffer. Clear error condition. */
#define IOCTL_EVTCHN_RESET \
_IOC(_IOC_NONE, 'E', 5, 0)
#endif /* __LINUX_PUBLIC_EVTCHN_H__ */

3
include/xen/interface/version.h
View File

@ -57,4 +57,7 @@ struct xen_feature_info {
/* Declares the features reported by XENVER_get_features. */
#include "features.h"
/* arg == NULL; returns host memory page size. */
#define XENVER_pagesize 7
#endif /* __XEN_PUBLIC_VERSION_H__ */

3
include/xen/xenbus.h
View File

@ -91,8 +91,7 @@ struct xenbus_driver {
void (*otherend_changed)(struct xenbus_device *dev,
enum xenbus_state backend_state);
int (*remove)(struct xenbus_device *dev);
int (*suspend)(struct xenbus_device *dev);
int (*suspend_cancel)(struct xenbus_device *dev);
int (*suspend)(struct xenbus_device *dev, pm_message_t state);
int (*resume)(struct xenbus_device *dev);
int (*uevent)(struct xenbus_device *, char **, int, char *, int);
struct device_driver driver;

2
kernel/sched.c
View File

@ -2783,7 +2783,7 @@ context_switch(struct rq *rq, struct task_struct *prev,
* combine the page table reload and the switch backend into
* one hypercall.
*/
arch_enter_lazy_cpu_mode();
arch_start_context_switch(prev);
if (unlikely(!mm)) {
next->active_mm = oldmm;