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KVM: nVMX: Use a gfn_to_hva_cache for vmptrld 

And thus another call to kvm_vcpu_map() can die.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20211115165030.7422-7-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Woodhouse 2021-11-15 16:50:26 +00:00 committed by Paolo Bonzini
parent 7d0172b3ca
commit cee66664dc
2 changed files with 22 additions and 9 deletions
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26
arch/x86/kvm/vmx/nested.c
View File

@ -5286,10 +5286,11 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
return 1;
if (vmx->nested.current_vmptr != vmptr) {
struct kvm_host_map map;
struct vmcs12 *new_vmcs12;
struct gfn_to_hva_cache *ghc = &vmx->nested.vmcs12_cache;
struct vmcs_hdr hdr;
if (kvm_vcpu_map(vcpu, gpa_to_gfn(vmptr), &map)) {
if (ghc->gpa != vmptr &&
kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc, vmptr, VMCS12_SIZE)) {
/*
* Reads from an unbacked page return all 1s,
* which means that the 32 bits located at the
@ -5300,12 +5301,16 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
}
new_vmcs12 = map.hva;
if (kvm_read_guest_offset_cached(vcpu->kvm, ghc, &hdr,
offsetof(struct vmcs12, hdr),
sizeof(hdr))) {
return nested_vmx_fail(vcpu,
VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
}
if (new_vmcs12->hdr.revision_id != VMCS12_REVISION ||
(new_vmcs12->hdr.shadow_vmcs &&
if (hdr.revision_id != VMCS12_REVISION ||
(hdr.shadow_vmcs &&
!nested_cpu_has_vmx_shadow_vmcs(vcpu))) {
kvm_vcpu_unmap(vcpu, &map, false);
return nested_vmx_fail(vcpu,
VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
}
@ -5316,8 +5321,11 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
* Load VMCS12 from guest memory since it is not already
* cached.
*/
memcpy(vmx->nested.cached_vmcs12, new_vmcs12, VMCS12_SIZE);
kvm_vcpu_unmap(vcpu, &map, false);
if (kvm_read_guest_cached(vcpu->kvm, ghc, vmx->nested.cached_vmcs12,
VMCS12_SIZE)) {
return nested_vmx_fail(vcpu,
VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
}
set_current_vmptr(vmx, vmptr);
}

5
arch/x86/kvm/vmx/vmx.h
View File

@ -146,6 +146,11 @@ struct nested_vmx {
*/
struct gfn_to_hva_cache shadow_vmcs12_cache;
/*
* GPA to HVA cache for VMCS12
*/
struct gfn_to_hva_cache vmcs12_cache;
/*
* Indicates if the shadow vmcs or enlightened vmcs must be updated
* with the data held by struct vmcs12.