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KVM: x86/mmu: Capture requested page level before NX huge page workaround 

Apply the "huge page disallowed" adjustment of the max level only after
capturing the original requested level.  The requested level will be
used in a future patch to skip adding pages to the list of disallowed
huge pages if a huge page wasn't possible anyways, e.g. if the page
isn't mapped as a huge page in the host.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200923183735.584-5-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
zero-sugar-mainline-defconfig
Sean Christopherson 2020-09-23 11:37:31 -07:00 committed by Paolo Bonzini
parent 6c2fd34f5c
commit 3cf066127e
2 changed files with 18 additions and 12 deletions
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22
arch/x86/kvm/mmu/mmu.c
View File

@ -3267,7 +3267,8 @@ static int host_pfn_mapping_level(struct kvm_vcpu *vcpu, gfn_t gfn,
}
static int kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, gfn_t gfn,
int max_level, kvm_pfn_t *pfnp)
int max_level, kvm_pfn_t *pfnp,
bool huge_page_disallowed, int *req_level)
{
struct kvm_memory_slot *slot;
struct kvm_lpage_info *linfo;
@ -3275,6 +3276,8 @@ static int kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, gfn_t gfn,
kvm_pfn_t mask;
int level;
*req_level = PG_LEVEL_4K;
if (unlikely(max_level == PG_LEVEL_4K))
return PG_LEVEL_4K;
@ -3299,7 +3302,14 @@ static int kvm_mmu_hugepage_adjust(struct kvm_vcpu *vcpu, gfn_t gfn,
if (level == PG_LEVEL_4K)
return level;
level = min(level, max_level);
*req_level = level = min(level, max_level);
/*
* Enforce the iTLB multihit workaround after capturing the requested
* level, which will be used to do precise, accurate accounting.
*/
if (huge_page_disallowed)
return PG_LEVEL_4K;
/*
* mmu_notifier_retry() was successful and mmu_lock is held, so
@ -3345,17 +3355,15 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
bool huge_page_disallowed = exec && nx_huge_page_workaround_enabled;
struct kvm_shadow_walk_iterator it;
struct kvm_mmu_page *sp;
int level, ret;
int level, req_level, ret;
gfn_t gfn = gpa >> PAGE_SHIFT;
gfn_t base_gfn = gfn;
if (WARN_ON(!VALID_PAGE(vcpu->arch.mmu->root_hpa)))
return RET_PF_RETRY;
if (huge_page_disallowed)
max_level = PG_LEVEL_4K;
level = kvm_mmu_hugepage_adjust(vcpu, gfn, max_level, &pfn);
level = kvm_mmu_hugepage_adjust(vcpu, gfn, max_level, &pfn,
huge_page_disallowed, &req_level);
trace_kvm_mmu_spte_requested(gpa, level, pfn);
for_each_shadow_entry(vcpu, gpa, it) {

8
arch/x86/kvm/mmu/paging_tmpl.h
View File

@ -636,7 +636,7 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gpa_t addr,
struct kvm_mmu_page *sp = NULL;
struct kvm_shadow_walk_iterator it;
unsigned direct_access, access = gw->pt_access;
int top_level, hlevel, ret;
int top_level, hlevel, req_level, ret;
gfn_t base_gfn = gw->gfn;
direct_access = gw->pte_access;
@ -682,10 +682,8 @@ static int FNAME(fetch)(struct kvm_vcpu *vcpu, gpa_t addr,
link_shadow_page(vcpu, it.sptep, sp);
}
if (huge_page_disallowed)
max_level = PG_LEVEL_4K;
hlevel = kvm_mmu_hugepage_adjust(vcpu, gw->gfn, max_level, &pfn);
hlevel = kvm_mmu_hugepage_adjust(vcpu, gw->gfn, max_level, &pfn,
huge_page_disallowed, &req_level);
trace_kvm_mmu_spte_requested(addr, gw->level, pfn);