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[PATCH] vmi: apic ops 

Use para_fill instead of directly setting the APIC ops to the result of the
vmi_get_function call - this allows one to implement a VMI ROM without
implementing APIC functions, just using the native APIC functions.

While doing this, I realized that there is a lot more cleanup that should have
been done.  Basically, we should never assume that the ROM implements a
specific set of functions, and always allow fallback to the native
implementation.

This is critical for future compatibility.

Signed-off-by: Anthony Liguori <anthony@codemonkey.ws>
Signed-off-by: Zachary Amsden <zach@vmware.com>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Zachary Amsden 2007-03-05 00:30:41 -08:00 committed by Linus Torvalds
parent a9eddc9528
commit 772205f62e
2 changed files with 92 additions and 73 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

164
arch/i386/kernel/vmi.c
View File

@ -54,6 +54,7 @@ static int disable_sep;
static int disable_tsc;
static int disable_mtrr;
static int disable_noidle;
static int disable_vmi_timer;
/* Cached VMI operations */
struct {
@ -661,12 +662,12 @@ static inline int __init probe_vmi_rom(void)
void vmi_bringup(void)
{
/* We must establish the lowmem mapping for MMU ops to work */
if (vmi_rom)
if (vmi_ops.set_linear_mapping)
vmi_ops.set_linear_mapping(0, __PAGE_OFFSET, max_low_pfn, 0);
}
/*
* Return a pointer to the VMI function or a NOP stub
* Return a pointer to a VMI function or NULL if unimplemented
*/
static void *vmi_get_function(int vmicall)
{
@ -677,12 +678,13 @@ static void *vmi_get_function(int vmicall)
if (rel->type == VMI_RELOCATION_CALL_REL)
return (void *)rel->eip;
else
return (void *)vmi_nop;
return NULL;
}
/*
* Helper macro for making the VMI paravirt-ops fill code readable.
* For unimplemented operations, fall back to default.
* For unimplemented operations, fall back to default, unless nop
* is returned by the ROM.
*/
#define para_fill(opname, vmicall) \
do { \
@ -691,9 +693,29 @@ do { \
if (rel->type != VMI_RELOCATION_NONE) { \
BUG_ON(rel->type != VMI_RELOCATION_CALL_REL); \
paravirt_ops.opname = (void *)rel->eip; \
} else if (rel->type == VMI_RELOCATION_NOP) \
paravirt_ops.opname = (void *)vmi_nop; \
} while (0)
/*
* Helper macro for making the VMI paravirt-ops fill code readable.
* For cached operations which do not match the VMI ROM ABI and must
* go through a tranlation stub. Ignore NOPs, since it is not clear
* a NOP * VMI function corresponds to a NOP paravirt-op when the
* functions are not in 1-1 correspondence.
*/
#define para_wrap(opname, wrapper, cache, vmicall) \
do { \
reloc = call_vrom_long_func(vmi_rom, get_reloc, \
VMI_CALL_##vmicall); \
BUG_ON(rel->type == VMI_RELOCATION_JUMP_REL); \
if (rel->type == VMI_RELOCATION_CALL_REL) { \
paravirt_ops.opname = wrapper; \
vmi_ops.cache = (void *)rel->eip; \
} \
} while (0)
/*
* Activate the VMI interface and switch into paravirtualized mode
*/
@ -730,13 +752,8 @@ static inline int __init activate_vmi(void)
* rdpmc is not yet used in Linux
*/
/* CPUID is special, so very special */
reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_CPUID);
if (rel->type != VMI_RELOCATION_NONE) {
BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
vmi_ops.cpuid = (void *)rel->eip;
paravirt_ops.cpuid = vmi_cpuid;
}
/* CPUID is special, so very special it gets wrapped like a present */
para_wrap(cpuid, vmi_cpuid, cpuid, CPUID);
para_fill(clts, CLTS);
para_fill(get_debugreg, GetDR);
@ -753,6 +770,7 @@ static inline int __init activate_vmi(void)
para_fill(restore_fl, SetInterruptMask);
para_fill(irq_disable, DisableInterrupts);
para_fill(irq_enable, EnableInterrupts);
/* irq_save_disable !!! sheer pain */
patch_offset(&irq_save_disable_callout[IRQ_PATCH_INT_MASK],
(char *)paravirt_ops.save_fl);
@ -760,26 +778,18 @@ static inline int __init activate_vmi(void)
(char *)paravirt_ops.irq_disable);
para_fill(wbinvd, WBINVD);
para_fill(read_tsc, RDTSC);
/* The following we emulate with trap and emulate for now */
/* paravirt_ops.read_msr = vmi_rdmsr */
/* paravirt_ops.write_msr = vmi_wrmsr */
para_fill(read_tsc, RDTSC);
/* paravirt_ops.rdpmc = vmi_rdpmc */
/* TR interface doesn't pass TR value */
reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_SetTR);
if (rel->type != VMI_RELOCATION_NONE) {
BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
vmi_ops.set_tr = (void *)rel->eip;
paravirt_ops.load_tr_desc = vmi_set_tr;
}
/* TR interface doesn't pass TR value, wrap */
para_wrap(load_tr_desc, vmi_set_tr, set_tr, SetTR);
/* LDT is special, too */
reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_SetLDT);
if (rel->type != VMI_RELOCATION_NONE) {
BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
vmi_ops._set_ldt = (void *)rel->eip;
paravirt_ops.set_ldt = vmi_set_ldt;
}
para_wrap(set_ldt, vmi_set_ldt, _set_ldt, SetLDT);
para_fill(load_gdt, SetGDT);
para_fill(load_idt, SetIDT);
@ -790,25 +800,14 @@ static inline int __init activate_vmi(void)
para_fill(write_ldt_entry, WriteLDTEntry);
para_fill(write_gdt_entry, WriteGDTEntry);
para_fill(write_idt_entry, WriteIDTEntry);
reloc = call_vrom_long_func(vmi_rom, get_reloc,
VMI_CALL_UpdateKernelStack);
if (rel->type != VMI_RELOCATION_NONE) {
BUG_ON(rel->type != VMI_RELOCATION_CALL_REL);
vmi_ops.set_kernel_stack = (void *)rel->eip;
paravirt_ops.load_esp0 = vmi_load_esp0;
}
para_wrap(load_esp0, vmi_load_esp0, set_kernel_stack, UpdateKernelStack);
para_fill(set_iopl_mask, SetIOPLMask);
paravirt_ops.io_delay = (void *)vmi_nop;
para_fill(io_delay, IODelay);
para_fill(set_lazy_mode, SetLazyMode);
reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_FlushTLB);
if (rel->type != VMI_RELOCATION_NONE) {
vmi_ops.flush_tlb = (void *)rel->eip;
paravirt_ops.flush_tlb_user = vmi_flush_tlb_user;
paravirt_ops.flush_tlb_kernel = vmi_flush_tlb_kernel;
}
/* user and kernel flush are just handled with different flags to FlushTLB */
para_wrap(flush_tlb_user, vmi_flush_tlb_user, flush_tlb, FlushTLB);
para_wrap(flush_tlb_kernel, vmi_flush_tlb_kernel, flush_tlb, FlushTLB);
para_fill(flush_tlb_single, InvalPage);
/*
@ -823,28 +822,40 @@ static inline int __init activate_vmi(void)
vmi_ops.set_pte = vmi_get_function(VMI_CALL_SetPxE);
vmi_ops.update_pte = vmi_get_function(VMI_CALL_UpdatePxE);
#endif
vmi_ops.set_linear_mapping = vmi_get_function(VMI_CALL_SetLinearMapping);
vmi_ops.allocate_page = vmi_get_function(VMI_CALL_AllocatePage);
vmi_ops.release_page = vmi_get_function(VMI_CALL_ReleasePage);
paravirt_ops.map_pt_hook = vmi_map_pt_hook;
paravirt_ops.alloc_pt = vmi_allocate_pt;
paravirt_ops.alloc_pd = vmi_allocate_pd;
paravirt_ops.alloc_pd_clone = vmi_allocate_pd_clone;
paravirt_ops.release_pt = vmi_release_pt;
paravirt_ops.release_pd = vmi_release_pd;
paravirt_ops.set_pte = vmi_set_pte;
paravirt_ops.set_pte_at = vmi_set_pte_at;
paravirt_ops.set_pmd = vmi_set_pmd;
paravirt_ops.pte_update = vmi_update_pte;
paravirt_ops.pte_update_defer = vmi_update_pte_defer;
if (vmi_ops.set_pte) {
paravirt_ops.set_pte = vmi_set_pte;
paravirt_ops.set_pte_at = vmi_set_pte_at;
paravirt_ops.set_pmd = vmi_set_pmd;
#ifdef CONFIG_X86_PAE
paravirt_ops.set_pte_atomic = vmi_set_pte_atomic;
paravirt_ops.set_pte_present = vmi_set_pte_present;
paravirt_ops.set_pud = vmi_set_pud;
paravirt_ops.pte_clear = vmi_pte_clear;
paravirt_ops.pmd_clear = vmi_pmd_clear;
paravirt_ops.set_pte_atomic = vmi_set_pte_atomic;
paravirt_ops.set_pte_present = vmi_set_pte_present;
paravirt_ops.set_pud = vmi_set_pud;
paravirt_ops.pte_clear = vmi_pte_clear;
paravirt_ops.pmd_clear = vmi_pmd_clear;
#endif
}
if (vmi_ops.update_pte) {
paravirt_ops.pte_update = vmi_update_pte;
paravirt_ops.pte_update_defer = vmi_update_pte_defer;
}
vmi_ops.allocate_page = vmi_get_function(VMI_CALL_AllocatePage);
if (vmi_ops.allocate_page) {
paravirt_ops.alloc_pt = vmi_allocate_pt;
paravirt_ops.alloc_pd = vmi_allocate_pd;
paravirt_ops.alloc_pd_clone = vmi_allocate_pd_clone;
}
vmi_ops.release_page = vmi_get_function(VMI_CALL_ReleasePage);
if (vmi_ops.release_page) {
paravirt_ops.release_pt = vmi_release_pt;
paravirt_ops.release_pd = vmi_release_pd;
}
para_wrap(map_pt_hook, vmi_map_pt_hook, set_linear_mapping,
SetLinearMapping);
/*
* These MUST always be patched. Don't support indirect jumps
* through these operations, as the VMI interface may use either
@ -856,21 +867,20 @@ static inline int __init activate_vmi(void)
paravirt_ops.iret = (void *)0xbadbab0;
#ifdef CONFIG_SMP
paravirt_ops.startup_ipi_hook = vmi_startup_ipi_hook;
vmi_ops.set_initial_ap_state = vmi_get_function(VMI_CALL_SetInitialAPState);
para_wrap(startup_ipi_hook, vmi_startup_ipi_hook, set_initial_ap_state, SetInitialAPState);
#endif
#ifdef CONFIG_X86_LOCAL_APIC
paravirt_ops.apic_read = vmi_get_function(VMI_CALL_APICRead);
paravirt_ops.apic_write = vmi_get_function(VMI_CALL_APICWrite);
paravirt_ops.apic_write_atomic = vmi_get_function(VMI_CALL_APICWrite);
para_fill(apic_read, APICRead);
para_fill(apic_write, APICWrite);
para_fill(apic_write_atomic, APICWrite);
#endif
/*
* Check for VMI timer functionality by probing for a cycle frequency method
*/
reloc = call_vrom_long_func(vmi_rom, get_reloc, VMI_CALL_GetCycleFrequency);
if (rel->type != VMI_RELOCATION_NONE) {
if (!disable_vmi_timer && rel->type != VMI_RELOCATION_NONE) {
vmi_timer_ops.get_cycle_frequency = (void *)rel->eip;
vmi_timer_ops.get_cycle_counter =
vmi_get_function(VMI_CALL_GetCycleCounter);
@ -890,13 +900,19 @@ static inline int __init activate_vmi(void)
#endif
paravirt_ops.get_scheduled_cycles = vmi_get_sched_cycles;
paravirt_ops.get_cpu_khz = vmi_cpu_khz;
/* We have true wallclock functions; disable CMOS clock sync */
no_sync_cmos_clock = 1;
} else {
disable_noidle = 1;
disable_vmi_timer = 1;
}
if (!disable_noidle)
/* No idle HZ mode only works if VMI timer and no idle is enabled */
if (disable_noidle || disable_vmi_timer)
para_fill(safe_halt, Halt);
else {
vmi_ops.halt = vmi_get_function(VMI_CALL_Halt);
paravirt_ops.safe_halt = vmi_safe_halt;
}
else
para_wrap(safe_halt, vmi_safe_halt, halt, Halt);
/*
* Alternative instruction rewriting doesn't happen soon enough
@ -932,10 +948,9 @@ void __init vmi_init(void)
activate_vmi();
#ifdef CONFIG_X86_IO_APIC
/* This is virtual hardware; timer routing is wired correctly */
no_timer_check = 1;
#endif
no_sync_cmos_clock = 1;
local_irq_restore(flags & X86_EFLAGS_IF);
}
@ -959,6 +974,9 @@ static int __init parse_vmi(char *arg)
} else if (!strcmp(arg, "disable_mtrr")) {
clear_bit(X86_FEATURE_MTRR, boot_cpu_data.x86_capability);
disable_mtrr = 1;
} else if (!strcmp(arg, "disable_timer")) {
disable_vmi_timer = 1;
disable_noidle = 1;
} else if (!strcmp(arg, "disable_noidle"))
disable_noidle = 1;
return 0;

1
include/asm-i386/vmi.h
View File

@ -97,6 +97,7 @@
#define VMI_CALL_SetInitialAPState 62
#define VMI_CALL_APICWrite 63
#define VMI_CALL_APICRead 64
#define VMI_CALL_IODelay 65
#define VMI_CALL_SetLazyMode 73
/*