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kvm: x86/mmu: Don't clear write flooding for direct SP

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Although there is no harm, but there is no point to clear write
flooding for direct SP.

Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Link: https://lore.kernel.org/r/20230105100310.6700-1-jiangshanlai@gmail.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Lai Jiangshan 2023-01-05 18:03:10 +08:00 committed by Sean Christopherson
parent dc1ae59fc4
commit 9e3fbdfd9b
1 changed files with 3 additions and 5 deletions
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8
arch/x86/kvm/mmu/paging_tmpl.h
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@ -642,12 +642,12 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root.hpa))) if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root.hpa)))
goto out_gpte_changed; goto out_gpte_changed;
for (shadow_walk_init(&it, vcpu, fault->addr); for_each_shadow_entry(vcpu, fault->addr, it) {
shadow_walk_okay(&it) && it.level > gw->level;
shadow_walk_next(&it)) {
gfn_t table_gfn; gfn_t table_gfn;
clear_sp_write_flooding_count(it.sptep); clear_sp_write_flooding_count(it.sptep);
if (it.level == gw->level)
break;
table_gfn = gw->table_gfn[it.level - 2]; table_gfn = gw->table_gfn[it.level - 2];
access = gw->pt_access[it.level - 2]; access = gw->pt_access[it.level - 2];
@ -692,8 +692,6 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault,
trace_kvm_mmu_spte_requested(fault); trace_kvm_mmu_spte_requested(fault);
for (; shadow_walk_okay(&it); shadow_walk_next(&it)) { for (; shadow_walk_okay(&it); shadow_walk_next(&it)) {
clear_sp_write_flooding_count(it.sptep);
/* /*
* We cannot overwrite existing page tables with an NX * We cannot overwrite existing page tables with an NX
* large page, as the leaf could be executable. * large page, as the leaf could be executable.