[PATCH v2 1/2] KVM: nVMX: Use INVALID_GPA for pointers used in nVMX.

From: Yu Zhang
Date: Wed Sep 29 2021 - 06:12:21 EST

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Clean up nested.c and vmx.c by using INVALID_GPA instead of "-1ull",
to denote an invalid address in nested VMX. Affected addresses are
the ones of VMXON region, current VMCS, VMCS link pointer, virtual-
APIC page, ENCLS-exiting bitmap, and IO bitmap etc.

Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Yu Zhang <yu.c.zhang@xxxxxxxxxxxxxxx>
---
arch/x86/kvm/vmx/nested.c | 60 +++++++++++++++++++--------------------
arch/x86/kvm/vmx/vmx.c | 4 +--
2 files changed, 32 insertions(+), 32 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index bc6327950657..25cf76c7fee8 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -191,7 +191,7 @@ 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 &&
+ if (vmx->nested.current_vmptr == INVALID_GPA &&
!evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
return nested_vmx_failInvalid(vcpu);

@@ -218,7 +218,7 @@ static inline u64 vmx_control_msr(u32 low, u32 high)
static void vmx_disable_shadow_vmcs(struct vcpu_vmx *vmx)
{
secondary_exec_controls_clearbit(vmx, SECONDARY_EXEC_SHADOW_VMCS);
- vmcs_write64(VMCS_LINK_POINTER, -1ull);
+ vmcs_write64(VMCS_LINK_POINTER, INVALID_GPA);
vmx->nested.need_vmcs12_to_shadow_sync = false;
}

@@ -292,7 +292,7 @@ static void free_nested(struct kvm_vcpu *vcpu)
vmx->nested.smm.vmxon = false;
free_vpid(vmx->nested.vpid02);
vmx->nested.posted_intr_nv = -1;
- vmx->nested.current_vmptr = -1ull;
+ vmx->nested.current_vmptr = INVALID_GPA;
if (enable_shadow_vmcs) {
vmx_disable_shadow_vmcs(vmx);
vmcs_clear(vmx->vmcs01.shadow_vmcs);
@@ -672,7 +672,7 @@ static void nested_cache_shadow_vmcs12(struct kvm_vcpu *vcpu,
struct vmcs12 *shadow;

if (!nested_cpu_has_shadow_vmcs(vmcs12) ||
- vmcs12->vmcs_link_pointer == -1ull)
+ vmcs12->vmcs_link_pointer == INVALID_GPA)
return;

shadow = get_shadow_vmcs12(vcpu);
@@ -690,7 +690,7 @@ static void nested_flush_cached_shadow_vmcs12(struct kvm_vcpu *vcpu,
struct vcpu_vmx *vmx = to_vmx(vcpu);

if (!nested_cpu_has_shadow_vmcs(vmcs12) ||
- vmcs12->vmcs_link_pointer == -1ull)
+ vmcs12->vmcs_link_pointer == INVALID_GPA)
return;

kvm_write_guest(vmx->vcpu.kvm, vmcs12->vmcs_link_pointer,
@@ -1957,7 +1957,7 @@ static enum nested_evmptrld_status nested_vmx_handle_enlightened_vmptrld(
}

if (unlikely(evmcs_gpa != vmx->nested.hv_evmcs_vmptr)) {
- vmx->nested.current_vmptr = -1ull;
+ vmx->nested.current_vmptr = INVALID_GPA;

nested_release_evmcs(vcpu);

@@ -2141,7 +2141,7 @@ static void prepare_vmcs02_constant_state(struct vcpu_vmx *vmx)
}

if (cpu_has_vmx_encls_vmexit())
- vmcs_write64(ENCLS_EXITING_BITMAP, -1ull);
+ vmcs_write64(ENCLS_EXITING_BITMAP, INVALID_GPA);

/*
* Set the MSR load/store lists to match L0's settings. Only the
@@ -2160,7 +2160,7 @@ static void prepare_vmcs02_early_rare(struct vcpu_vmx *vmx,
{
prepare_vmcs02_constant_state(vmx);

- vmcs_write64(VMCS_LINK_POINTER, -1ull);
+ vmcs_write64(VMCS_LINK_POINTER, INVALID_GPA);

if (enable_vpid) {
if (nested_cpu_has_vpid(vmcs12) && vmx->nested.vpid02)
@@ -2907,7 +2907,7 @@ static int nested_vmx_check_vmcs_link_ptr(struct kvm_vcpu *vcpu,
struct vmcs12 *shadow;
struct kvm_host_map map;

- if (vmcs12->vmcs_link_pointer == -1ull)
+ if (vmcs12->vmcs_link_pointer == INVALID_GPA)
return 0;

if (CC(!page_address_valid(vcpu, vmcs12->vmcs_link_pointer)))
@@ -3174,7 +3174,7 @@ static bool nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
* Write an illegal value to VIRTUAL_APIC_PAGE_ADDR to
* force VM-Entry to fail.
*/
- vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, -1ull);
+ vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, INVALID_GPA);
}
}

@@ -3485,7 +3485,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
}

if (CC(!evmptr_is_valid(vmx->nested.hv_evmcs_vmptr) &&
- vmx->nested.current_vmptr == -1ull))
+ vmx->nested.current_vmptr == INVALID_GPA))
return nested_vmx_failInvalid(vcpu);

vmcs12 = get_vmcs12(vcpu);
@@ -4938,7 +4938,7 @@ static inline void nested_release_vmcs12(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);

- if (vmx->nested.current_vmptr == -1ull)
+ if (vmx->nested.current_vmptr == INVALID_GPA)
return;

copy_vmcs02_to_vmcs12_rare(vcpu, get_vmcs12(vcpu));
@@ -4958,7 +4958,7 @@ static inline void nested_release_vmcs12(struct kvm_vcpu *vcpu)

kvm_mmu_free_roots(vcpu, &vcpu->arch.guest_mmu, KVM_MMU_ROOTS_ALL);

- vmx->nested.current_vmptr = -1ull;
+ vmx->nested.current_vmptr = INVALID_GPA;
}

/* Emulate the VMXOFF instruction */
@@ -5053,12 +5053,12 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
return 1;

/*
- * In VMX non-root operation, when the VMCS-link pointer is -1ull,
+ * In VMX non-root operation, when the VMCS-link pointer is INVALID_GPA,
* any VMREAD sets the ALU flags for VMfailInvalid.
*/
- if (vmx->nested.current_vmptr == -1ull ||
+ if (vmx->nested.current_vmptr == INVALID_GPA ||
(is_guest_mode(vcpu) &&
- get_vmcs12(vcpu)->vmcs_link_pointer == -1ull))
+ get_vmcs12(vcpu)->vmcs_link_pointer == INVALID_GPA))
return nested_vmx_failInvalid(vcpu);

/* Decode instruction info and find the field to read */
@@ -5145,12 +5145,12 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
return 1;

/*
- * In VMX non-root operation, when the VMCS-link pointer is -1ull,
+ * In VMX non-root operation, when the VMCS-link pointer is INVALID_GPA,
* any VMWRITE sets the ALU flags for VMfailInvalid.
*/
- if (vmx->nested.current_vmptr == -1ull ||
+ if (vmx->nested.current_vmptr == INVALID_GPA ||
(is_guest_mode(vcpu) &&
- get_vmcs12(vcpu)->vmcs_link_pointer == -1ull))
+ get_vmcs12(vcpu)->vmcs_link_pointer == INVALID_GPA))
return nested_vmx_failInvalid(vcpu);

if (instr_info & BIT(10))
@@ -5601,7 +5601,7 @@ bool nested_vmx_check_io_bitmaps(struct kvm_vcpu *vcpu, unsigned int port,
gpa_t bitmap, last_bitmap;
u8 b;

- last_bitmap = (gpa_t)-1;
+ last_bitmap = INVALID_GPA;
b = -1;

while (size > 0) {
@@ -6070,8 +6070,8 @@ static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
.format = KVM_STATE_NESTED_FORMAT_VMX,
.size = sizeof(kvm_state),
.hdr.vmx.flags = 0,
- .hdr.vmx.vmxon_pa = -1ull,
- .hdr.vmx.vmcs12_pa = -1ull,
+ .hdr.vmx.vmxon_pa = INVALID_GPA,
+ .hdr.vmx.vmcs12_pa = INVALID_GPA,
.hdr.vmx.preemption_timer_deadline = 0,
};
struct kvm_vmx_nested_state_data __user *user_vmx_nested_state =
@@ -6097,7 +6097,7 @@ static int vmx_get_nested_state(struct kvm_vcpu *vcpu,

if (is_guest_mode(vcpu) &&
nested_cpu_has_shadow_vmcs(vmcs12) &&
- vmcs12->vmcs_link_pointer != -1ull)
+ vmcs12->vmcs_link_pointer != INVALID_GPA)
kvm_state.size += sizeof(user_vmx_nested_state->shadow_vmcs12);
}

@@ -6173,7 +6173,7 @@ static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
return -EFAULT;

if (nested_cpu_has_shadow_vmcs(vmcs12) &&
- vmcs12->vmcs_link_pointer != -1ull) {
+ vmcs12->vmcs_link_pointer != INVALID_GPA) {
if (copy_to_user(user_vmx_nested_state->shadow_vmcs12,
get_shadow_vmcs12(vcpu), VMCS12_SIZE))
return -EFAULT;
@@ -6208,11 +6208,11 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
if (kvm_state->format != KVM_STATE_NESTED_FORMAT_VMX)
return -EINVAL;

- if (kvm_state->hdr.vmx.vmxon_pa == -1ull) {
+ if (kvm_state->hdr.vmx.vmxon_pa == INVALID_GPA) {
if (kvm_state->hdr.vmx.smm.flags)
return -EINVAL;

- if (kvm_state->hdr.vmx.vmcs12_pa != -1ull)
+ if (kvm_state->hdr.vmx.vmcs12_pa != INVALID_GPA)
return -EINVAL;

/*
@@ -6266,7 +6266,7 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,

vmx_leave_nested(vcpu);

- if (kvm_state->hdr.vmx.vmxon_pa == -1ull)
+ if (kvm_state->hdr.vmx.vmxon_pa == INVALID_GPA)
return 0;

vmx->nested.vmxon_ptr = kvm_state->hdr.vmx.vmxon_pa;
@@ -6279,13 +6279,13 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
/* See vmx_has_valid_vmcs12. */
if ((kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE) ||
(kvm_state->flags & KVM_STATE_NESTED_EVMCS) ||
- (kvm_state->hdr.vmx.vmcs12_pa != -1ull))
+ (kvm_state->hdr.vmx.vmcs12_pa != INVALID_GPA))
return -EINVAL;
else
return 0;
}

- if (kvm_state->hdr.vmx.vmcs12_pa != -1ull) {
+ if (kvm_state->hdr.vmx.vmcs12_pa != INVALID_GPA) {
if (kvm_state->hdr.vmx.vmcs12_pa == kvm_state->hdr.vmx.vmxon_pa ||
!page_address_valid(vcpu, kvm_state->hdr.vmx.vmcs12_pa))
return -EINVAL;
@@ -6330,7 +6330,7 @@ static int vmx_set_nested_state(struct kvm_vcpu *vcpu,

ret = -EINVAL;
if (nested_cpu_has_shadow_vmcs(vmcs12) &&
- vmcs12->vmcs_link_pointer != -1ull) {
+ vmcs12->vmcs_link_pointer != INVALID_GPA) {
struct vmcs12 *shadow_vmcs12 = get_shadow_vmcs12(vcpu);

if (kvm_state->size <
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 0c2c0d5ae873..047992eb4b20 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4339,7 +4339,7 @@ static void init_vmcs(struct vcpu_vmx *vmx)
if (cpu_has_vmx_msr_bitmap())
vmcs_write64(MSR_BITMAP, __pa(vmx->vmcs01.msr_bitmap));

- vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
+ vmcs_write64(VMCS_LINK_POINTER, INVALID_GPA); /* 22.3.1.5 */

/* Control */
pin_controls_set(vmx, vmx_pin_based_exec_ctrl(vmx));
@@ -6887,7 +6887,7 @@ static int vmx_create_vcpu(struct kvm_vcpu *vcpu)
vcpu_setup_sgx_lepubkeyhash(vcpu);

vmx->nested.posted_intr_nv = -1;
- vmx->nested.current_vmptr = -1ull;
+ vmx->nested.current_vmptr = INVALID_GPA;
vmx->nested.hv_evmcs_vmptr = EVMPTR_INVALID;

vcpu->arch.microcode_version = 0x100000000ULL;
--
2.25.1

Next message: Yu Zhang: "[PATCH v2 2/2] KVM: nVMX: Reset vmxon_ptr upon VMXOFF emulation."
Previous message: Yu Zhang: "[PATCH v2 0/2] Cleanups for pointer usages in nVMX."
In reply to: Yu Zhang: "[PATCH v2 0/2] Cleanups for pointer usages in nVMX."
Next in thread: Yu Zhang: "[PATCH v2 2/2] KVM: nVMX: Reset vmxon_ptr upon VMXOFF emulation."
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