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Subject[PATCH v4 14/14] KVM/nVMX: Use kvm_vcpu_map for accessing the enhanced VMCS
Date
Use kvm_vcpu_map for accessing the enhanced VMCS since using
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
--
2.7.4
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