[PATCH] KVM: nVMX: Wrap VM-Fail valid path in generic VM-Fail helper
From: Sean Christopherson
Date: Mon Jun 08 2020 - 21:56:20 EST
Add nested_vmx_fail() to wrap VM-Fail paths that _may_ result in VM-Fail
Valid to make it clear at the call sites that the Valid flavor isn't
guaranteed.
Suggested-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
arch/x86/kvm/vmx/nested.c | 77 ++++++++++++++++++---------------------
1 file changed, 36 insertions(+), 41 deletions(-)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index bcb50724be38..f45a36e5c863 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -171,15 +171,6 @@ static int nested_vmx_failInvalid(struct kvm_vcpu *vcpu)
static int nested_vmx_failValid(struct kvm_vcpu *vcpu,
u32 vm_instruction_error)
{
- struct vcpu_vmx *vmx = to_vmx(vcpu);
-
- /*
- * failValid writes the error number to the current VMCS, which
- * can't be done if there isn't a current VMCS.
- */
- if (vmx->nested.current_vmptr == -1ull && !vmx->nested.hv_evmcs)
- return nested_vmx_failInvalid(vcpu);
-
vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
& ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
X86_EFLAGS_SF | X86_EFLAGS_OF))
@@ -192,6 +183,20 @@ static int nested_vmx_failValid(struct kvm_vcpu *vcpu,
return kvm_skip_emulated_instruction(vcpu);
}
+static int nested_vmx_fail(struct kvm_vcpu *vcpu, u32 vm_instruction_error)
+{
+ struct vcpu_vmx *vmx = to_vmx(vcpu);
+
+ /*
+ * failValid writes the error number to the current VMCS, which
+ * can't be done if there isn't a current VMCS.
+ */
+ if (vmx->nested.current_vmptr == -1ull && !vmx->nested.hv_evmcs)
+ return nested_vmx_failInvalid(vcpu);
+
+ return nested_vmx_failValid(vcpu, vm_instruction_error);
+}
+
static void nested_vmx_abort(struct kvm_vcpu *vcpu, u32 indicator)
{
/* TODO: not to reset guest simply here. */
@@ -3456,19 +3461,18 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
* when using the merged vmcs02.
*/
if (interrupt_shadow & KVM_X86_SHADOW_INT_MOV_SS)
- return nested_vmx_failValid(vcpu,
- VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS);
+ return nested_vmx_fail(vcpu, VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS);
if (vmcs12->launch_state == launch)
- return nested_vmx_failValid(vcpu,
+ return nested_vmx_fail(vcpu,
launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS
: VMXERR_VMRESUME_NONLAUNCHED_VMCS);
if (nested_vmx_check_controls(vcpu, vmcs12))
- return nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
+ return nested_vmx_fail(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
if (nested_vmx_check_host_state(vcpu, vmcs12))
- return nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_HOST_STATE_FIELD);
+ return nested_vmx_fail(vcpu, VMXERR_ENTRY_INVALID_HOST_STATE_FIELD);
/*
* We're finally done with prerequisite checking, and can start with
@@ -3517,7 +3521,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
if (status == NVMX_VMENTRY_VMEXIT)
return 1;
WARN_ON_ONCE(status != NVMX_VMENTRY_VMFAIL);
- return nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
+ return nested_vmx_fail(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
}
/*
@@ -4460,7 +4464,7 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason,
* flag and the VM-instruction error field of the VMCS
* accordingly, and skip the emulated instruction.
*/
- (void)nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
+ (void)nested_vmx_fail(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
/*
* Restore L1's host state to KVM's software model. We're here
@@ -4760,8 +4764,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu)
}
if (vmx->nested.vmxon)
- return nested_vmx_failValid(vcpu,
- VMXERR_VMXON_IN_VMX_ROOT_OPERATION);
+ return nested_vmx_fail(vcpu, VMXERR_VMXON_IN_VMX_ROOT_OPERATION);
if ((vmx->msr_ia32_feature_control & VMXON_NEEDED_FEATURES)
!= VMXON_NEEDED_FEATURES) {
@@ -4852,12 +4855,10 @@ static int handle_vmclear(struct kvm_vcpu *vcpu)
return r;
if (!page_address_valid(vcpu, vmptr))
- return nested_vmx_failValid(vcpu,
- VMXERR_VMCLEAR_INVALID_ADDRESS);
+ return nested_vmx_fail(vcpu, VMXERR_VMCLEAR_INVALID_ADDRESS);
if (vmptr == vmx->nested.vmxon_ptr)
- return nested_vmx_failValid(vcpu,
- VMXERR_VMCLEAR_VMXON_POINTER);
+ return nested_vmx_fail(vcpu, VMXERR_VMCLEAR_VMXON_POINTER);
/*
* When Enlightened VMEntry is enabled on the calling CPU we treat
@@ -4927,8 +4928,7 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
offset = vmcs_field_to_offset(field);
if (offset < 0)
- return nested_vmx_failValid(vcpu,
- VMXERR_UNSUPPORTED_VMCS_COMPONENT);
+ return nested_vmx_fail(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
if (!is_guest_mode(vcpu) && is_vmcs12_ext_field(field))
copy_vmcs02_to_vmcs12_rare(vcpu, vmcs12);
@@ -5031,8 +5031,7 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
offset = vmcs_field_to_offset(field);
if (offset < 0)
- return nested_vmx_failValid(vcpu,
- VMXERR_UNSUPPORTED_VMCS_COMPONENT);
+ return nested_vmx_fail(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
/*
* If the vCPU supports "VMWRITE to any supported field in the
@@ -5040,8 +5039,7 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
*/
if (vmcs_field_readonly(field) &&
!nested_cpu_has_vmwrite_any_field(vcpu))
- return nested_vmx_failValid(vcpu,
- VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT);
+ return nested_vmx_fail(vcpu, VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT);
/*
* Ensure vmcs12 is up-to-date before any VMWRITE that dirties
@@ -5116,12 +5114,10 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
return r;
if (!page_address_valid(vcpu, vmptr))
- return nested_vmx_failValid(vcpu,
- VMXERR_VMPTRLD_INVALID_ADDRESS);
+ return nested_vmx_fail(vcpu, VMXERR_VMPTRLD_INVALID_ADDRESS);
if (vmptr == vmx->nested.vmxon_ptr)
- return nested_vmx_failValid(vcpu,
- VMXERR_VMPTRLD_VMXON_POINTER);
+ return nested_vmx_fail(vcpu, VMXERR_VMPTRLD_VMXON_POINTER);
/* Forbid normal VMPTRLD if Enlightened version was used */
if (vmx->nested.hv_evmcs)
@@ -5138,7 +5134,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
* given physical address won't match the required
* VMCS12_REVISION identifier.
*/
- return nested_vmx_failValid(vcpu,
+ return nested_vmx_fail(vcpu,
VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
}
@@ -5148,7 +5144,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
(new_vmcs12->hdr.shadow_vmcs &&
!nested_cpu_has_vmx_shadow_vmcs(vcpu))) {
kvm_vcpu_unmap(vcpu, &map, false);
- return nested_vmx_failValid(vcpu,
+ return nested_vmx_fail(vcpu,
VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
}
@@ -5233,8 +5229,7 @@ static int handle_invept(struct kvm_vcpu *vcpu)
types = (vmx->nested.msrs.ept_caps >> VMX_EPT_EXTENT_SHIFT) & 6;
if (type >= 32 || !(types & (1 << type)))
- return nested_vmx_failValid(vcpu,
- VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
+ return nested_vmx_fail(vcpu, VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
/* According to the Intel VMX instruction reference, the memory
* operand is read even if it isn't needed (e.g., for type==global)
@@ -5255,7 +5250,7 @@ static int handle_invept(struct kvm_vcpu *vcpu)
switch (type) {
case VMX_EPT_EXTENT_CONTEXT:
if (!nested_vmx_check_eptp(vcpu, operand.eptp))
- return nested_vmx_failValid(vcpu,
+ return nested_vmx_fail(vcpu,
VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
roots_to_free = 0;
@@ -5315,7 +5310,7 @@ static int handle_invvpid(struct kvm_vcpu *vcpu)
VMX_VPID_EXTENT_SUPPORTED_MASK) >> 8;
if (type >= 32 || !(types & (1 << type)))
- return nested_vmx_failValid(vcpu,
+ return nested_vmx_fail(vcpu,
VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
/* according to the intel vmx instruction reference, the memory
@@ -5329,7 +5324,7 @@ static int handle_invvpid(struct kvm_vcpu *vcpu)
return vmx_handle_memory_failure(vcpu, r, &e);
if (operand.vpid >> 16)
- return nested_vmx_failValid(vcpu,
+ return nested_vmx_fail(vcpu,
VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
vpid02 = nested_get_vpid02(vcpu);
@@ -5337,14 +5332,14 @@ static int handle_invvpid(struct kvm_vcpu *vcpu)
case VMX_VPID_EXTENT_INDIVIDUAL_ADDR:
if (!operand.vpid ||
is_noncanonical_address(operand.gla, vcpu))
- return nested_vmx_failValid(vcpu,
+ return nested_vmx_fail(vcpu,
VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
vpid_sync_vcpu_addr(vpid02, operand.gla);
break;
case VMX_VPID_EXTENT_SINGLE_CONTEXT:
case VMX_VPID_EXTENT_SINGLE_NON_GLOBAL:
if (!operand.vpid)
- return nested_vmx_failValid(vcpu,
+ return nested_vmx_fail(vcpu,
VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
vpid_sync_context(vpid02);
break;
--
2.26.0