Upper page do not need to be tracked the status bit, it is safe to set the
dirty and let cpu to happily prefetch it
Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/mmu.c | 13 +++++--------
1 files changed, 5 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 6913a16..a2d28aa 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -150,6 +150,9 @@ module_param(dbg, bool, 0644);
#define SPTE_HOST_WRITEABLE (1ULL << PT_FIRST_AVAIL_BITS_SHIFT)
#define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level)
+#define SHADOW_PAGE_TABLE \
+ (PT_PRESENT_MASK | PT_WRITABLE_MASK | shadow_user_mask | \
+ shadow_x_mask | shadow_accessed_mask | shadow_dirty_mask)
static bool sp_is_unsync(struct kvm_mmu_page *sp)
{
@@ -1808,9 +1811,7 @@ static void link_shadow_page(u64 *sptep, struct kvm_mmu_page *sp)
{
u64 spte;
- spte = __pa(sp->spt)
- | PT_PRESENT_MASK | PT_ACCESSED_MASK
- | PT_WRITABLE_MASK | PT_USER_MASK;
+ spte = __pa(sp->spt) | SHADOW_PAGE_TABLE;
mmu_spte_set(sptep, spte);
}
@@ -2497,11 +2498,7 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
return -ENOMEM;
}
- mmu_spte_set(iterator.sptep,
- __pa(sp->spt)
- | PT_PRESENT_MASK | PT_WRITABLE_MASK
- | shadow_user_mask | shadow_x_mask
- | shadow_accessed_mask);
+ link_shadow_page(iterator.sptep, sp);
}
}
return emulate;
--
1.7.7.4
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