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KVM: nVMX: vmread/vmwrite: Use shadow vmcs12 if running L2 

This is done as a preparation to VMCS shadowing emulation.

Signed-off-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Liran Alon 2018-06-23 02:35:09 +03:00 committed by Paolo Bonzini
parent 9a78bdf31d
commit 6d894f498f
1 changed files with 49 additions and 12 deletions
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61
arch/x86/kvm/vmx.c
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@ -8341,6 +8341,7 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION); unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO); u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
gva_t gva = 0; gva_t gva = 0;
struct vmcs12 *vmcs12;
if (!nested_vmx_check_permission(vcpu)) if (!nested_vmx_check_permission(vcpu))
return 1; return 1;
@ -8348,10 +8349,24 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
if (!nested_vmx_check_vmcs12(vcpu)) if (!nested_vmx_check_vmcs12(vcpu))
return kvm_skip_emulated_instruction(vcpu); return kvm_skip_emulated_instruction(vcpu);
if (!is_guest_mode(vcpu))
vmcs12 = get_vmcs12(vcpu);
else {
/*
* When vmcs->vmcs_link_pointer is -1ull, any VMREAD
* to shadowed-field sets the ALU flags for VMfailInvalid.
*/
if (get_vmcs12(vcpu)->vmcs_link_pointer == -1ull) {
nested_vmx_failInvalid(vcpu);
return kvm_skip_emulated_instruction(vcpu);
}
vmcs12 = get_shadow_vmcs12(vcpu);
}
/* Decode instruction info and find the field to read */ /* Decode instruction info and find the field to read */
field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf)); field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
/* Read the field, zero-extended to a u64 field_value */ /* Read the field, zero-extended to a u64 field_value */
if (vmcs12_read_any(get_vmcs12(vcpu), field, &field_value) < 0) { if (vmcs12_read_any(vmcs12, field, &field_value) < 0) {
nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT); nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
return kvm_skip_emulated_instruction(vcpu); return kvm_skip_emulated_instruction(vcpu);
} }
@ -8393,6 +8408,7 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
*/ */
u64 field_value = 0; u64 field_value = 0;
struct x86_exception e; struct x86_exception e;
struct vmcs12 *vmcs12;
if (!nested_vmx_check_permission(vcpu)) if (!nested_vmx_check_permission(vcpu))
return 1; return 1;
@ -8427,23 +8443,44 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
return kvm_skip_emulated_instruction(vcpu); return kvm_skip_emulated_instruction(vcpu);
} }
if (vmcs12_write_any(get_vmcs12(vcpu), field, field_value) < 0) { if (!is_guest_mode(vcpu))
vmcs12 = get_vmcs12(vcpu);
else {
/*
* When vmcs->vmcs_link_pointer is -1ull, any VMWRITE
* to shadowed-field sets the ALU flags for VMfailInvalid.
*/
if (get_vmcs12(vcpu)->vmcs_link_pointer == -1ull) {
nested_vmx_failInvalid(vcpu);
return kvm_skip_emulated_instruction(vcpu);
}
vmcs12 = get_shadow_vmcs12(vcpu);
}
if (vmcs12_write_any(vmcs12, field, field_value) < 0) {
nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT); nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
return kvm_skip_emulated_instruction(vcpu); return kvm_skip_emulated_instruction(vcpu);
} }
switch (field) { /*
* Do not track vmcs12 dirty-state if in guest-mode
* as we actually dirty shadow vmcs12 instead of vmcs12.
*/
if (!is_guest_mode(vcpu)) {
switch (field) {
#define SHADOW_FIELD_RW(x) case x: #define SHADOW_FIELD_RW(x) case x:
#include "vmx_shadow_fields.h" #include "vmx_shadow_fields.h"
/* /*
* The fields that can be updated by L1 without a vmexit are * The fields that can be updated by L1 without a vmexit are
* always updated in the vmcs02, the others go down the slow * always updated in the vmcs02, the others go down the slow
* path of prepare_vmcs02. * path of prepare_vmcs02.
*/ */
break; break;
default: default:
vmx->nested.dirty_vmcs12 = true; vmx->nested.dirty_vmcs12 = true;
break; break;
}
} }
nested_vmx_succeed(vcpu); nested_vmx_succeed(vcpu);