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KVM: VMX: Invalidate hv_tlb_eptp to denote an EPTP mismatch 

Drop the dedicated 'ept_pointers_match' field in favor of stuffing
'hv_tlb_eptp' with INVALID_PAGE to mark it as invalid, i.e. to denote
that there is at least one EPTP mismatch.  Use a local variable to
track whether or not a mismatch is detected so that hv_tlb_eptp can be
used to skip redundant flushes.

No functional change intended.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210305183123.3978098-7-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-03-05 10:31:18 -08:00 committed by Paolo Bonzini
parent 446f7f1155
commit cdbd4b40e7
2 changed files with 23 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
arch/x86/kvm/vmx/vmx.c
View File

@ -500,32 +500,44 @@ static int hv_remote_flush_tlb_with_range(struct kvm *kvm,
{
struct kvm_vmx *kvm_vmx = to_kvm_vmx(kvm);
struct kvm_vcpu *vcpu;
int ret = 0, i;
int ret = 0, i, nr_unique_valid_eptps;
u64 tmp_eptp;
spin_lock(&kvm_vmx->ept_pointer_lock);
if (kvm_vmx->ept_pointers_match != EPT_POINTERS_MATCH) {
kvm_vmx->ept_pointers_match = EPT_POINTERS_MATCH;
kvm_vmx->hv_tlb_eptp = INVALID_PAGE;
if (!VALID_PAGE(kvm_vmx->hv_tlb_eptp)) {
nr_unique_valid_eptps = 0;
/*
* Flush all valid EPTPs, and see if all vCPUs have converged
* on a common EPTP, in which case future flushes can skip the
* loop and flush the common EPTP.
*/
kvm_for_each_vcpu(i, vcpu, kvm) {
tmp_eptp = to_vmx(vcpu)->ept_pointer;
if (!VALID_PAGE(tmp_eptp) ||
tmp_eptp == kvm_vmx->hv_tlb_eptp)
continue;
if (!VALID_PAGE(kvm_vmx->hv_tlb_eptp))
/*
* Set the tracked EPTP to the first valid EPTP. Keep
* this EPTP for the entirety of the loop even if more
* EPTPs are encountered as a low effort optimization
* to avoid flushing the same (first) EPTP again.
*/
if (++nr_unique_valid_eptps == 1)
kvm_vmx->hv_tlb_eptp = tmp_eptp;
else
kvm_vmx->ept_pointers_match
= EPT_POINTERS_MISMATCH;
ret |= hv_remote_flush_eptp(tmp_eptp, range);
}
if (kvm_vmx->ept_pointers_match == EPT_POINTERS_MISMATCH)
/*
* The optimized flush of a single EPTP can't be used if there
* are multiple valid EPTPs (obviously).
*/
if (nr_unique_valid_eptps > 1)
kvm_vmx->hv_tlb_eptp = INVALID_PAGE;
} else if (VALID_PAGE(kvm_vmx->hv_tlb_eptp)) {
} else {
ret = hv_remote_flush_eptp(kvm_vmx->hv_tlb_eptp, range);
}
@ -3105,8 +3117,7 @@ static void vmx_load_mmu_pgd(struct kvm_vcpu *vcpu, hpa_t root_hpa,
if (kvm_x86_ops.tlb_remote_flush) {
spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock);
to_vmx(vcpu)->ept_pointer = eptp;
to_kvm_vmx(kvm)->ept_pointers_match
= EPT_POINTERS_CHECK;
to_kvm_vmx(kvm)->hv_tlb_eptp = INVALID_PAGE;
spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock);
}

7
arch/x86/kvm/vmx/vmx.h
View File

@ -338,12 +338,6 @@ struct vcpu_vmx {
} shadow_msr_intercept;
};
enum ept_pointers_status {
EPT_POINTERS_CHECK = 0,
EPT_POINTERS_MATCH = 1,
EPT_POINTERS_MISMATCH = 2
};
struct kvm_vmx {
struct kvm kvm;
@ -352,7 +346,6 @@ struct kvm_vmx {
gpa_t ept_identity_map_addr;
hpa_t hv_tlb_eptp;
enum ept_pointers_status ept_pointers_match;
spinlock_t ept_pointer_lock;
};