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xen: Fixes for 4.13-rc5 

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Merge tag 'for-linus-4.13b-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:
 "Some fixes for Xen:

   - a fix for a regression introduced in 4.13 for a Xen HVM-guest
     configured with KASLR

   - a fix for a possible deadlock in the xenbus driver when booting the
     system

   - a fix for lost interrupts in Xen guests"

* tag 'for-linus-4.13b-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen/events: Fix interrupt lost during irq_disable and irq_enable
  xen: avoid deadlock in xenbus
  xen: fix hvm guest with kaslr enabled
  xen: split up xen_hvm_init_shared_info()
  x86: provide an init_mem_mapping hypervisor hook
This commit is contained in:
Linus Torvalds 2017-08-12 09:01:36 -07:00
parent 216e4a1def 020db9d3c1
commit 043cd07c55
5 changed files with 53 additions and 24 deletions
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10
arch/x86/include/asm/hypervisor.h
View File

@ -43,6 +43,9 @@ struct hypervisor_x86 {
/* pin current vcpu to specified physical cpu (run rarely) */
void (*pin_vcpu)(int);
/* called during init_mem_mapping() to setup early mappings. */
void (*init_mem_mapping)(void);
};
extern const struct hypervisor_x86 *x86_hyper;
@ -57,8 +60,15 @@ extern const struct hypervisor_x86 x86_hyper_kvm;
extern void init_hypervisor_platform(void);
extern bool hypervisor_x2apic_available(void);
extern void hypervisor_pin_vcpu(int cpu);
static inline void hypervisor_init_mem_mapping(void)
{
if (x86_hyper && x86_hyper->init_mem_mapping)
x86_hyper->init_mem_mapping();
}
#else
static inline void init_hypervisor_platform(void) { }
static inline bool hypervisor_x2apic_available(void) { return false; }
static inline void hypervisor_init_mem_mapping(void) { }
#endif /* CONFIG_HYPERVISOR_GUEST */
#endif /* _ASM_X86_HYPERVISOR_H */

3
arch/x86/mm/init.c
View File

@ -18,6 +18,7 @@
#include <asm/dma.h> /* for MAX_DMA_PFN */
#include <asm/microcode.h>
#include <asm/kaslr.h>
#include <asm/hypervisor.h>
/*
* We need to define the tracepoints somewhere, and tlb.c
@ -636,6 +637,8 @@ void __init init_mem_mapping(void)
load_cr3(swapper_pg_dir);
__flush_tlb_all();
hypervisor_init_mem_mapping();
early_memtest(0, max_pfn_mapped << PAGE_SHIFT);
}

59
arch/x86/xen/enlighten_hvm.c
View File

@ -12,6 +12,7 @@
#include <asm/setup.h>
#include <asm/hypervisor.h>
#include <asm/e820/api.h>
#include <asm/early_ioremap.h>
#include <asm/xen/cpuid.h>
#include <asm/xen/hypervisor.h>
@ -21,38 +22,50 @@
#include "mmu.h"
#include "smp.h"
void __ref xen_hvm_init_shared_info(void)
static unsigned long shared_info_pfn;
void xen_hvm_init_shared_info(void)
{
struct xen_add_to_physmap xatp;
u64 pa;
if (HYPERVISOR_shared_info == &xen_dummy_shared_info) {
/*
* Search for a free page starting at 4kB physical address.
* Low memory is preferred to avoid an EPT large page split up
* by the mapping.
* Starting below X86_RESERVE_LOW (usually 64kB) is fine as
* the BIOS used for HVM guests is well behaved and won't
* clobber memory other than the first 4kB.
*/
for (pa = PAGE_SIZE;
!e820__mapped_all(pa, pa + PAGE_SIZE, E820_TYPE_RAM) ||
memblock_is_reserved(pa);
pa += PAGE_SIZE)
;
memblock_reserve(pa, PAGE_SIZE);
HYPERVISOR_shared_info = __va(pa);
}
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
xatp.gpfn = virt_to_pfn(HYPERVISOR_shared_info);
xatp.gpfn = shared_info_pfn;
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();
}
static void __init reserve_shared_info(void)
{
u64 pa;
/*
* Search for a free page starting at 4kB physical address.
* Low memory is preferred to avoid an EPT large page split up
* by the mapping.
* Starting below X86_RESERVE_LOW (usually 64kB) is fine as
* the BIOS used for HVM guests is well behaved and won't
* clobber memory other than the first 4kB.
*/
for (pa = PAGE_SIZE;
!e820__mapped_all(pa, pa + PAGE_SIZE, E820_TYPE_RAM) ||
memblock_is_reserved(pa);
pa += PAGE_SIZE)
;
shared_info_pfn = PHYS_PFN(pa);
memblock_reserve(pa, PAGE_SIZE);
HYPERVISOR_shared_info = early_memremap(pa, PAGE_SIZE);
}
static void __init xen_hvm_init_mem_mapping(void)
{
early_memunmap(HYPERVISOR_shared_info, PAGE_SIZE);
HYPERVISOR_shared_info = __va(PFN_PHYS(shared_info_pfn));
}
static void __init init_hvm_pv_info(void)
{
int major, minor;
@ -153,6 +166,7 @@ static void __init xen_hvm_guest_init(void)
init_hvm_pv_info();
reserve_shared_info();
xen_hvm_init_shared_info();
/*
@ -218,5 +232,6 @@ const struct hypervisor_x86 x86_hyper_xen_hvm = {
.init_platform = xen_hvm_guest_init,
.pin_vcpu = xen_pin_vcpu,
.x2apic_available = xen_x2apic_para_available,
.init_mem_mapping = xen_hvm_init_mem_mapping,
};
EXPORT_SYMBOL(x86_hyper_xen_hvm);

2
drivers/xen/events/events_base.c
View File

@ -574,7 +574,7 @@ static void shutdown_pirq(struct irq_data *data)
static void enable_pirq(struct irq_data *data)
{
startup_pirq(data);
enable_dynirq(data);
}
static void disable_pirq(struct irq_data *data)

3
drivers/xen/xenbus/xenbus_xs.c
View File

@ -857,6 +857,8 @@ static int xenwatch_thread(void *unused)
struct list_head *ent;
struct xs_watch_event *event;
xenwatch_pid = current->pid;
for (;;) {
wait_event_interruptible(watch_events_waitq,
!list_empty(&watch_events));
@ -925,7 +927,6 @@ int xs_init(void)
task = kthread_run(xenwatch_thread, NULL, "xenwatch");
if (IS_ERR(task))
return PTR_ERR(task);
xenwatch_pid = task->pid;
/* shutdown watches for kexec boot */
xs_reset_watches();