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SubjectRe: [PATCH v4 14/14] KVM/nVMX: Use kvm_vcpu_map for accessing the enhanced VMCS
Date
KarimAllah Ahmed <karahmed@amazon.de> writes:

> Use kvm_vcpu_map for accessing the enhanced VMCS since using

just a nitpick: "eVMCS" stands for Enlightened VMCS, not 'enhanced' :-)

> kvm_vcpu_gpa_to_page() and kmap() will only work for guest memory that has
> a "struct page".
>
> Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
> ---
> arch/x86/kvm/vmx.c | 16 ++++++----------
> 1 file changed, 6 insertions(+), 10 deletions(-)
>
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index a958700..83a614f 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -894,7 +894,7 @@ struct nested_vmx {
> } smm;
>
> gpa_t hv_evmcs_vmptr;
> - struct page *hv_evmcs_page;
> + struct kvm_host_map hv_evmcs_map;
> struct hv_enlightened_vmcs *hv_evmcs;
> };
>
> @@ -8456,10 +8456,8 @@ static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
> if (!vmx->nested.hv_evmcs)
> return;
>
> - kunmap(vmx->nested.hv_evmcs_page);
> - kvm_release_page_dirty(vmx->nested.hv_evmcs_page);
> + kvm_vcpu_unmap(&vmx->nested.hv_evmcs_map);
> vmx->nested.hv_evmcs_vmptr = -1ull;
> - vmx->nested.hv_evmcs_page = NULL;
> vmx->nested.hv_evmcs = NULL;
> }
>
> @@ -8559,7 +8557,7 @@ static int handle_vmclear(struct kvm_vcpu *vcpu)
> return nested_vmx_failValid(vcpu,
> VMXERR_VMCLEAR_VMXON_POINTER);
>
> - if (vmx->nested.hv_evmcs_page) {
> + if (vmx->nested.hv_evmcs_map.hva) {
> if (vmptr == vmx->nested.hv_evmcs_vmptr)
> nested_release_evmcs(vcpu);
> } else {
> @@ -9355,13 +9353,11 @@ static int nested_vmx_handle_enlightened_vmptrld(struct kvm_vcpu *vcpu,
>
> nested_release_evmcs(vcpu);
>
> - vmx->nested.hv_evmcs_page = kvm_vcpu_gpa_to_page(
> - vcpu, assist_page.current_nested_vmcs);
> -
> - if (unlikely(is_error_page(vmx->nested.hv_evmcs_page)))
> + if (kvm_vcpu_map(vcpu, gpa_to_gfn(assist_page.current_nested_vmcs),
> + &vmx->nested.hv_evmcs_map))
> return 0;
>
> - vmx->nested.hv_evmcs = kmap(vmx->nested.hv_evmcs_page);
> + vmx->nested.hv_evmcs = vmx->nested.hv_evmcs_map.hva;
>
> /*
> * Currently, KVM only supports eVMCS version 1

--
Vitaly

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