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hv: nested: remove vcpu->arch.nested.current_vmcs12_ptr

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This variable represents the L1 GPA of the current VMCS12.  But it's
no longer needed in the multiple active VMCS12 case, which uses the
following variables for this purpose.

- nested->current_vvmcs refers to the vvmcs[] entry which contains the
  cached current VMCS12, its associated VMCS02, and other context info.

- nested->current_vvmcs->vmcs12_gpa refers to the L1 GPA of this
  current VMCS12.

Tracked-On: #6289
Signed-off-by: Zide Chen <zide.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Zide Chen 2021-09-06 10:43:55 -07:00 committed by wenlingz
parent 799a4d332a
commit 4e54c3880b
2 changed files with 11 additions and 14 deletions
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23
hypervisor/arch/x86/guest/nested.c
View File

@ -738,7 +738,6 @@ int32_t vmxon_vmexit_handler(struct acrn_vcpu *vcpu)
vcpu->arch.nested.control_fields_dirty = false;
vcpu->arch.nested.in_l2_guest = false;
vcpu->arch.nested.vmxon_ptr = vmptr_gpa;
vcpu->arch.nested.current_vmcs12_ptr = INVALID_GPA;
vcpu->arch.nested.current_vvmcs = NULL;
nested_vmx_result(VMsucceed, 0);
@ -784,7 +783,6 @@ int32_t vmxoff_vmexit_handler(struct acrn_vcpu *vcpu)
vcpu->arch.nested.host_state_dirty = false;
vcpu->arch.nested.control_fields_dirty = false;
vcpu->arch.nested.in_l2_guest = false;
vcpu->arch.nested.current_vmcs12_ptr = INVALID_GPA;
vcpu->arch.nested.current_vvmcs = NULL;
(void)memset(vcpu->arch.nested.vvmcs[0].vmcs02, 0U, PAGE_SIZE);
@ -819,7 +817,7 @@ int32_t vmread_vmexit_handler(struct acrn_vcpu *vcpu)
uint32_t vmcs_field;
if (check_vmx_permission(vcpu)) {
if (vcpu->arch.nested.current_vmcs12_ptr == INVALID_GPA) {
if ((cur_vvmcs == NULL) || (cur_vvmcs->vmcs12_gpa == INVALID_GPA)) {
nested_vmx_result(VMfailInvalid, 0);
} else {
/* TODO: VMfailValid for invalid VMCS fields */
@ -854,7 +852,7 @@ int32_t vmwrite_vmexit_handler(struct acrn_vcpu *vcpu)
uint32_t vmcs_field;
if (check_vmx_permission(vcpu)) {
if (vcpu->arch.nested.current_vmcs12_ptr == INVALID_GPA) {
if ((cur_vvmcs == NULL) || (cur_vvmcs->vmcs12_gpa == INVALID_GPA)) {
nested_vmx_result(VMfailInvalid, 0);
} else {
/* TODO: VMfailValid for invalid VMCS fields */
@ -1052,8 +1050,7 @@ static void clear_vmcs02(struct acrn_vcpu *vcpu, struct acrn_vvmcs *vvmcs)
sync_vmcs02_to_vmcs12(&vvmcs->vmcs12);
/* flush cached VMCS12 back to L1 guest */
(void)copy_to_gpa(vcpu->vm, (void *)&vvmcs->vmcs12,
vcpu->arch.nested.current_vmcs12_ptr, sizeof(struct acrn_vmcs12));
(void)copy_to_gpa(vcpu->vm, (void *)&vvmcs->vmcs12, vvmcs->vmcs12_gpa, sizeof(struct acrn_vmcs12));
/*
* The current VMCS12 has been flushed out, so that the active VMCS02
@ -1064,8 +1061,8 @@ static void clear_vmcs02(struct acrn_vcpu *vcpu, struct acrn_vvmcs *vvmcs)
/* This VMCS can no longer refer to any shadow EPT */
put_nept_desc(vvmcs->vmcs12.ept_pointer);
/* no current VMCS12 */
vcpu->arch.nested.current_vmcs12_ptr = INVALID_GPA;
/* This vvmcs[] entry doesn't cache a VMCS12 any more */
vvmcs->vmcs12_gpa = INVALID_GPA;
}
/*
@ -1086,11 +1083,11 @@ int32_t vmptrld_vmexit_handler(struct acrn_vcpu *vcpu)
nested_vmx_result(VMfailValid, VMXERR_VMPTRLD_VMXON_POINTER);
} else if (!validate_vmcs_revision_id(vcpu, vmcs12_gpa)) {
nested_vmx_result(VMfailValid, VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
} else if (nested->current_vmcs12_ptr == vmcs12_gpa) {
} else if ((nested->current_vvmcs != NULL) && (nested->current_vvmcs->vmcs12_gpa == vmcs12_gpa)) {
/* VMPTRLD current VMCS12, do nothing */
nested_vmx_result(VMsucceed, 0);
} else {
if (nested->current_vmcs12_ptr != INVALID_GPA) {
if (vvmcs->vmcs12_gpa != INVALID_GPA) {
/*
* L1 hypervisor VMPTRLD a new VMCS12, or VMPTRLD a VMCLEARed VMCS12.
* The current VMCS12 remains active but ACRN needs to sync the content of it
@ -1136,8 +1133,8 @@ int32_t vmptrld_vmexit_handler(struct acrn_vcpu *vcpu)
/* VMCS02 is referenced by VMCS01 Link Pointer */
enable_vmcs_shadowing(vvmcs);
vvmcs->vmcs12_gpa = vmcs12_gpa;
nested->current_vvmcs = vvmcs;
nested->current_vmcs12_ptr = vmcs12_gpa;
nested_vmx_result(VMsucceed, 0);
}
}
@ -1162,7 +1159,7 @@ int32_t vmclear_vmexit_handler(struct acrn_vcpu *vcpu)
} else if (vmcs12_gpa == nested->vmxon_ptr) {
nested_vmx_result(VMfailValid, VMXERR_VMCLEAR_VMXON_POINTER);
} else {
if (vcpu->arch.nested.current_vmcs12_ptr == vmcs12_gpa) {
if (vvmcs->vmcs12_gpa == vmcs12_gpa) {
/*
* The target VMCS12 is active and current.
* VMCS02 is active and being used as a shadow VMCS.
@ -1376,7 +1373,7 @@ static void nested_vmentry(struct acrn_vcpu *vcpu, bool is_launch)
struct acrn_vvmcs *cur_vvmcs = vcpu->arch.nested.current_vvmcs;
struct acrn_vmcs12 *vmcs12 = &cur_vvmcs->vmcs12;
if (vcpu->arch.nested.current_vmcs12_ptr == INVALID_GPA) {
if ((cur_vvmcs == NULL) || (cur_vvmcs->vmcs12_gpa == INVALID_GPA)) {
nested_vmx_result(VMfailInvalid, 0);
} else if (is_launch && (vmcs12->launch_state != VMCS12_LAUNCH_STATE_CLEAR)) {
nested_vmx_result(VMfailValid, VMXERR_VMLAUNCH_NONCLEAR_VMCS);

2
hypervisor/include/arch/x86/asm/guest/nested.h
View File

@ -332,12 +332,12 @@ int32_t invvpid_vmexit_handler(struct acrn_vcpu *vcpu);
struct acrn_vvmcs {
uint8_t vmcs02[PAGE_SIZE]; /* VMCS to run L2 and as Link Pointer in VMCS01 */
struct acrn_vmcs12 vmcs12; /* To cache L1's VMCS12*/
uint64_t vmcs12_gpa; /* The corresponding L1 GPA for this VMCS12 */
} __aligned(PAGE_SIZE);
struct acrn_nested {
struct acrn_vvmcs vvmcs[1];
struct acrn_vvmcs *current_vvmcs; /* Refer to the current loaded VMCS12 */
uint64_t current_vmcs12_ptr; /* GPA */
uint64_t vmxon_ptr; /* GPA */
bool vmxon; /* To indicate if vCPU entered VMX operation */
bool in_l2_guest; /* To indicate if vCPU is currently in Guest mode (from L1's perspective) */