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| author | Avi Kivity <avi@qumranet.com> | 2007-05-31 14:46:04 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2007-07-16 11:05:44 +0200 |
| commit | e663ee64aefc57f7eff7325142206c4ea0200be8 (patch) | |
| tree | a95c5a1015914ee4101c1770039ad1457e8767c3 | |
| parent | KVM: Make shadow pte updates atomic (diff) | |
| download | linux-e663ee64aefc57f7eff7325142206c4ea0200be8.tar.xz linux-e663ee64aefc57f7eff7325142206c4ea0200be8.zip | |
KVM: MMU: Make setting shadow ptes atomic on i386
Signed-off-by: Avi Kivity <avi@qumranet.com>
| -rw-r--r-- | drivers/kvm/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/kvm/mmu.c | 14 | ||||
| -rw-r--r-- | drivers/kvm/paging_tmpl.h | 4 |
3 files changed, 15 insertions, 4 deletions
diff --git a/drivers/kvm/Kconfig b/drivers/kvm/Kconfig index 2f661e5f0dae..33fa28a8c199 100644 --- a/drivers/kvm/Kconfig +++ b/drivers/kvm/Kconfig @@ -11,6 +11,7 @@ if VIRTUALIZATION config KVM tristate "Kernel-based Virtual Machine (KVM) support" depends on X86 && EXPERIMENTAL + depends on X86_CMPXCHG64 || 64BIT ---help--- Support hosting fully virtualized guest machines using hardware virtualization extensions. You will need a fairly recent diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index 3cdbf687df25..f24b540148aa 100644 --- a/drivers/kvm/mmu.c +++ b/drivers/kvm/mmu.c @@ -22,6 +22,7 @@ #include <linux/mm.h> #include <linux/highmem.h> #include <linux/module.h> +#include <asm/cmpxchg.h> #include "vmx.h" #include "kvm.h" @@ -204,6 +205,15 @@ static int is_rmap_pte(u64 pte) == (PT_WRITABLE_MASK | PT_PRESENT_MASK); } +static void set_shadow_pte(u64 *sptep, u64 spte) +{ +#ifdef CONFIG_X86_64 + set_64bit((unsigned long *)sptep, spte); +#else + set_64bit((unsigned long long *)sptep, spte); +#endif +} + static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache, struct kmem_cache *base_cache, int min, gfp_t gfp_flags) @@ -446,7 +456,7 @@ static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn) rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte); rmap_remove(vcpu, spte); kvm_arch_ops->tlb_flush(vcpu); - *spte &= ~(u64)PT_WRITABLE_MASK; + set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK); } } @@ -699,7 +709,7 @@ static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu, } BUG_ON(!parent_pte); kvm_mmu_put_page(vcpu, page, parent_pte); - *parent_pte = 0; + set_shadow_pte(parent_pte, 0); } kvm_mmu_page_unlink_children(vcpu, page); if (!page->root_count) { diff --git a/drivers/kvm/paging_tmpl.h b/drivers/kvm/paging_tmpl.h index 397a4039eaad..fabc2c9093cd 100644 --- a/drivers/kvm/paging_tmpl.h +++ b/drivers/kvm/paging_tmpl.h @@ -234,7 +234,7 @@ static void FNAME(set_pte_common)(struct kvm_vcpu *vcpu, spte |= gaddr; spte |= PT_SHADOW_IO_MARK; spte &= ~PT_PRESENT_MASK; - *shadow_pte = spte; + set_shadow_pte(shadow_pte, spte); return; } @@ -280,7 +280,7 @@ unshadowed: if (access_bits & PT_WRITABLE_MASK) mark_page_dirty(vcpu->kvm, gaddr >> PAGE_SHIFT); - *shadow_pte = spte; + set_shadow_pte(shadow_pte, spte); page_header_update_slot(vcpu->kvm, shadow_pte, gaddr); if (!was_rmapped) rmap_add(vcpu, shadow_pte); |