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KVM: nVMX: Use '-1' in 'hv_evmcs_vmptr' to indicate that eVMCS is not in use

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Instead of checking 'vmx->nested.hv_evmcs' use '-1' in
'vmx->nested.hv_evmcs_vmptr' to indicate 'evmcs is not in use' state. This
matches how we check 'vmx->nested.current_vmptr'. Introduce EVMPTR_INVALID
and evmptr_is_valid() and use it instead of raw '-1' check as a preparation
to adding other 'special' values.

No functional change intended.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210526132026.270394-2-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-05-26 15:20:16 +02:00 • committed by Paolo Bonzini
parent 158a48ecf7
commit 1e9dfbd748
5 changed files with 40 additions and 28 deletions
Download patch file Download diff file Expand all files Collapse all files

3
arch/x86/kvm/vmx/evmcs.c
View file

@ -319,6 +319,9 @@ bool nested_enlightened_vmentry(struct kvm_vcpu *vcpu, u64 *evmcs_gpa)
if (unlikely(!assist_page.enlighten_vmentry))
return false;
if (unlikely(!evmptr_is_valid(assist_page.current_nested_vmcs)))
return false;
*evmcs_gpa = assist_page.current_nested_vmcs;
return true;

7
arch/x86/kvm/vmx/evmcs.h
View file

@ -197,6 +197,13 @@ static inline void evmcs_load(u64 phys_addr) {}
static inline void evmcs_touch_msr_bitmap(void) {}
#endif /* IS_ENABLED(CONFIG_HYPERV) */
#define EVMPTR_INVALID (-1ULL)
static inline bool evmptr_is_valid(u64 evmptr)
{
return evmptr != EVMPTR_INVALID;
}
enum nested_evmptrld_status {
EVMPTRLD_DISABLED,
EVMPTRLD_SUCCEEDED,

51
arch/x86/kvm/vmx/nested.c
View file

@ -187,7 +187,8 @@ static int nested_vmx_fail(struct kvm_vcpu *vcpu, u32 vm_instruction_error)
* 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)
if (vmx->nested.current_vmptr == -1ull &&
!evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
return nested_vmx_failInvalid(vcpu);
return nested_vmx_failValid(vcpu, vm_instruction_error);
@ -221,12 +222,12 @@ static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (!vmx->nested.hv_evmcs)
return;
if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
kvm_vcpu_unmap(vcpu, &vmx->nested.hv_evmcs_map, true);
vmx->nested.hv_evmcs_vmptr = 0;
vmx->nested.hv_evmcs = NULL;
}
vmx->nested.hv_evmcs_vmptr = EVMPTR_INVALID;
}
static void vmx_sync_vmcs_host_state(struct vcpu_vmx *vmx,
@ -1981,9 +1982,7 @@ static enum nested_evmptrld_status nested_vmx_handle_enlightened_vmptrld(
if (!nested_enlightened_vmentry(vcpu, &evmcs_gpa))
return EVMPTRLD_DISABLED;
if (unlikely(!vmx->nested.hv_evmcs ||
evmcs_gpa != vmx->nested.hv_evmcs_vmptr)) {
if (!vmx->nested.hv_evmcs)
if (unlikely(evmcs_gpa != vmx->nested.hv_evmcs_vmptr)) {
vmx->nested.current_vmptr = -1ull;
nested_release_evmcs(vcpu);
@ -2055,7 +2054,7 @@ void nested_sync_vmcs12_to_shadow(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (vmx->nested.hv_evmcs) {
if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
copy_vmcs12_to_enlightened(vmx);
/* All fields are clean */
vmx->nested.hv_evmcs->hv_clean_fields |=
@ -2207,7 +2206,7 @@ static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
u32 exec_control;
u64 guest_efer = nested_vmx_calc_efer(vmx, vmcs12);
if (vmx->nested.dirty_vmcs12 || vmx->nested.hv_evmcs)
if (vmx->nested.dirty_vmcs12 || evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
prepare_vmcs02_early_rare(vmx, vmcs12);
/*
@ -2492,15 +2491,14 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
enum vm_entry_failure_code *entry_failure_code)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
struct hv_enlightened_vmcs *hv_evmcs = vmx->nested.hv_evmcs;
bool load_guest_pdptrs_vmcs12 = false;
if (vmx->nested.dirty_vmcs12 || hv_evmcs) {
if (vmx->nested.dirty_vmcs12 || evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
prepare_vmcs02_rare(vmx, vmcs12);
vmx->nested.dirty_vmcs12 = false;
load_guest_pdptrs_vmcs12 = !hv_evmcs ||
!(hv_evmcs->hv_clean_fields &
load_guest_pdptrs_vmcs12 = !evmptr_is_valid(vmx->nested.hv_evmcs_vmptr) ||
!(vmx->nested.hv_evmcs->hv_clean_fields &
HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP1);
}
@ -3102,7 +3100,8 @@ static bool nested_get_evmcs_page(struct kvm_vcpu *vcpu)
* L2 was running), map it here to make sure vmcs12 changes are
* properly reflected.
*/
if (vmx->nested.enlightened_vmcs_enabled && !vmx->nested.hv_evmcs) {
if (vmx->nested.enlightened_vmcs_enabled &&
!evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
enum nested_evmptrld_status evmptrld_status =
nested_vmx_handle_enlightened_vmptrld(vcpu, false);
@ -3465,7 +3464,7 @@ vmentry_fail_vmexit:
load_vmcs12_host_state(vcpu, vmcs12);
vmcs12->vm_exit_reason = exit_reason.full;
if (enable_shadow_vmcs || vmx->nested.hv_evmcs)
if (enable_shadow_vmcs || evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
vmx->nested.need_vmcs12_to_shadow_sync = true;
return NVMX_VMENTRY_VMEXIT;
}
@ -3493,7 +3492,8 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
return nested_vmx_failInvalid(vcpu);
}
if (CC(!vmx->nested.hv_evmcs && vmx->nested.current_vmptr == -1ull))
if (CC(!evmptr_is_valid(vmx->nested.hv_evmcs_vmptr) &&
vmx->nested.current_vmptr == -1ull))
return nested_vmx_failInvalid(vcpu);
vmcs12 = get_vmcs12(vcpu);
@ -3507,7 +3507,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
if (CC(vmcs12->hdr.shadow_vmcs))
return nested_vmx_failInvalid(vcpu);
if (vmx->nested.hv_evmcs) {
if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
copy_enlightened_to_vmcs12(vmx);
/* Enlightened VMCS doesn't have launch state */
vmcs12->launch_state = !launch;
@ -4066,10 +4066,11 @@ static void sync_vmcs02_to_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (vmx->nested.hv_evmcs)
if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
sync_vmcs02_to_vmcs12_rare(vcpu, vmcs12);
vmx->nested.need_sync_vmcs02_to_vmcs12_rare = !vmx->nested.hv_evmcs;
vmx->nested.need_sync_vmcs02_to_vmcs12_rare =
!evmptr_is_valid(vmx->nested.hv_evmcs_vmptr);
vmcs12->guest_cr0 = vmcs12_guest_cr0(vcpu, vmcs12);
vmcs12->guest_cr4 = vmcs12_guest_cr4(vcpu, vmcs12);
@ -4569,7 +4570,7 @@ void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason,
}
if ((vm_exit_reason != -1) &&
(enable_shadow_vmcs || vmx->nested.hv_evmcs))
(enable_shadow_vmcs || evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)))
vmx->nested.need_vmcs12_to_shadow_sync = true;
/* in case we halted in L2 */
@ -5265,7 +5266,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
return nested_vmx_fail(vcpu, VMXERR_VMPTRLD_VMXON_POINTER);
/* Forbid normal VMPTRLD if Enlightened version was used */
if (vmx->nested.hv_evmcs)
if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
return 1;
if (vmx->nested.current_vmptr != vmptr) {
@ -5321,7 +5322,7 @@ static int handle_vmptrst(struct kvm_vcpu *vcpu)
if (!nested_vmx_check_permission(vcpu))
return 1;
if (unlikely(to_vmx(vcpu)->nested.hv_evmcs))
if (unlikely(evmptr_is_valid(to_vmx(vcpu)->nested.hv_evmcs_vmptr)))
return 1;
if (get_vmx_mem_address(vcpu, exit_qual, instr_info,
@ -6093,7 +6094,7 @@ static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
if (vmx_has_valid_vmcs12(vcpu)) {
kvm_state.size += sizeof(user_vmx_nested_state->vmcs12);
if (vmx->nested.hv_evmcs)
if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
kvm_state.flags |= KVM_STATE_NESTED_EVMCS;
if (is_guest_mode(vcpu) &&
@ -6149,7 +6150,7 @@ static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
} else {
copy_vmcs02_to_vmcs12_rare(vcpu, get_vmcs12(vcpu));
if (!vmx->nested.need_vmcs12_to_shadow_sync) {
if (vmx->nested.hv_evmcs)
if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
copy_enlightened_to_vmcs12(vmx);
else if (enable_shadow_vmcs)
copy_shadow_to_vmcs12(vmx);

2
arch/x86/kvm/vmx/nested.h
View file

@ -63,7 +63,7 @@ static inline int vmx_has_valid_vmcs12(struct kvm_vcpu *vcpu)
* have vmcs12 if it is true.
*/
return is_guest_mode(vcpu) || vmx->nested.current_vmptr != -1ull ||
vmx->nested.hv_evmcs;
evmptr_is_valid(vmx->nested.hv_evmcs_vmptr);
}
static inline u16 nested_get_vpid02(struct kvm_vcpu *vcpu)

1
arch/x86/kvm/vmx/vmx.c
View file

@ -6861,6 +6861,7 @@ static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
vmx->nested.posted_intr_nv = -1;
vmx->nested.current_vmptr = -1ull;
vmx->nested.hv_evmcs_vmptr = EVMPTR_INVALID;
vcpu->arch.microcode_version = 0x100000000ULL;
vmx->msr_ia32_feature_control_valid_bits = FEAT_CTL_LOCKED;