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Date: Sun, 27 Nov 2016 20:18:54 -0800
From: Kyle Huey <me@...ehuey.com>
To: Paolo Bonzini <pbonzini@...hat.com>,
Radim Krčmář <rkrcmar@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
Joerg Roedel <joro@...tes.org>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] KVM: VMX: Move skip_emulated_instruction out of nested_vmx_check_vmcs12
We can't return both the pass/fail boolean for the vmcs and the upcoming
continue/exit-to-userspace boolean for skip_emulated_instruction out of
nested_vmx_check_vmcs, so move skip_emulated_instruction out of it instead.
Additionally, VMENTER/VMRESUME only trigger singlestep exceptions when
they advance the IP to the following instruction, not when they a) succeed,
b) fail MSR validation or c) throw an exception. Add a
skip_emulated_instruction_no_trap variant that will not check RFLAGS.TF.
Signed-off-by: Kyle Huey <khuey@...ehuey.com>
---
arch/x86/kvm/vmx.c | 60 +++++++++++++++++++++++++++++++++++-------------------
1 file changed, 39 insertions(+), 21 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index f2f9cf5..9cc4c41 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2455,28 +2455,33 @@ static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
interruptibility |= GUEST_INTR_STATE_MOV_SS;
else if (mask & KVM_X86_SHADOW_INT_STI)
interruptibility |= GUEST_INTR_STATE_STI;
if ((interruptibility != interruptibility_old))
vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility);
}
-static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
+static void skip_emulated_instruction_no_trap(struct kvm_vcpu *vcpu)
{
unsigned long rip;
rip = kvm_rip_read(vcpu);
rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
kvm_rip_write(vcpu, rip);
/* skipping an emulated instruction also counts */
vmx_set_interrupt_shadow(vcpu, 0);
}
+static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
+{
+ skip_emulated_instruction_no_trap(vcpu);
+}
+
/*
* KVM wants to inject page-faults which it got to the guest. This function
* checks whether in a nested guest, we need to inject them to L1 or L2.
*/
static int nested_vmx_check_exception(struct kvm_vcpu *vcpu, unsigned nr)
{
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
@@ -7319,33 +7324,36 @@ static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx)
* VMX instructions which assume a current vmcs12 (i.e., that VMPTRLD was
* used before) all generate the same failure when it is missing.
*/
static int nested_vmx_check_vmcs12(struct kvm_vcpu *vcpu)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
if (vmx->nested.current_vmptr == -1ull) {
nested_vmx_failInvalid(vcpu);
- skip_emulated_instruction(vcpu);
return 0;
}
return 1;
}
static int handle_vmread(struct kvm_vcpu *vcpu)
{
unsigned long field;
u64 field_value;
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
gva_t gva = 0;
- if (!nested_vmx_check_permission(vcpu) ||
- !nested_vmx_check_vmcs12(vcpu))
+ if (!nested_vmx_check_permission(vcpu))
+ return 1;
+
+ if (!nested_vmx_check_vmcs12(vcpu)) {
+ skip_emulated_instruction(vcpu);
return 1;
+ }
/* Decode instruction info and find the field to read */
field = kvm_register_readl(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
/* Read the field, zero-extended to a u64 field_value */
if (vmcs12_read_any(vcpu, field, &field_value) < 0) {
nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
skip_emulated_instruction(vcpu);
return 1;
@@ -7383,19 +7391,23 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu)
* mode, and eventually we need to write that into a field of several
* possible lengths. The code below first zero-extends the value to 64
* bit (field_value), and then copies only the appropriate number of
* bits into the vmcs12 field.
*/
u64 field_value = 0;
struct x86_exception e;
- if (!nested_vmx_check_permission(vcpu) ||
- !nested_vmx_check_vmcs12(vcpu))
+ if (!nested_vmx_check_permission(vcpu))
+ return 1;
+
+ if (!nested_vmx_check_vmcs12(vcpu)) {
+ skip_emulated_instruction(vcpu);
return 1;
+ }
if (vmx_instruction_info & (1u << 10))
field_value = kvm_register_readl(vcpu,
(((vmx_instruction_info) >> 3) & 0xf));
else {
if (get_vmx_mem_address(vcpu, exit_qualification,
vmx_instruction_info, false, &gva))
return 1;
@@ -10041,21 +10053,22 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
{
struct vmcs12 *vmcs12;
struct vcpu_vmx *vmx = to_vmx(vcpu);
int cpu;
struct loaded_vmcs *vmcs02;
bool ia32e;
u32 msr_entry_idx;
- if (!nested_vmx_check_permission(vcpu) ||
- !nested_vmx_check_vmcs12(vcpu))
+ if (!nested_vmx_check_permission(vcpu))
return 1;
- skip_emulated_instruction(vcpu);
+ if (!nested_vmx_check_vmcs12(vcpu))
+ goto out;
+
vmcs12 = get_vmcs12(vcpu);
if (enable_shadow_vmcs)
copy_shadow_to_vmcs12(vmx);
/*
* The nested entry process starts with enforcing various prerequisites
* on vmcs12 as required by the Intel SDM, and act appropriately when
@@ -10065,43 +10078,43 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
* To speed up the normal (success) code path, we should avoid checking
* for misconfigurations which will anyway be caught by the processor
* when using the merged vmcs02.
*/
if (vmcs12->launch_state == launch) {
nested_vmx_failValid(vcpu,
launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS
: VMXERR_VMRESUME_NONLAUNCHED_VMCS);
- return 1;
+ goto out;
}
if (vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE &&
vmcs12->guest_activity_state != GUEST_ACTIVITY_HLT) {
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
- return 1;
+ goto out;
}
if (!nested_get_vmcs12_pages(vcpu, vmcs12)) {
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
- return 1;
+ goto out;
}
if (nested_vmx_check_msr_bitmap_controls(vcpu, vmcs12)) {
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
- return 1;
+ goto out;
}
if (nested_vmx_check_apicv_controls(vcpu, vmcs12)) {
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
- return 1;
+ goto out;
}
if (nested_vmx_check_msr_switch_controls(vcpu, vmcs12)) {
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
- return 1;
+ goto out;
}
if (!vmx_control_verify(vmcs12->cpu_based_vm_exec_control,
vmx->nested.nested_vmx_true_procbased_ctls_low,
vmx->nested.nested_vmx_procbased_ctls_high) ||
!vmx_control_verify(vmcs12->secondary_vm_exec_control,
vmx->nested.nested_vmx_secondary_ctls_low,
vmx->nested.nested_vmx_secondary_ctls_high) ||
@@ -10111,36 +10124,36 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
!vmx_control_verify(vmcs12->vm_exit_controls,
vmx->nested.nested_vmx_true_exit_ctls_low,
vmx->nested.nested_vmx_exit_ctls_high) ||
!vmx_control_verify(vmcs12->vm_entry_controls,
vmx->nested.nested_vmx_true_entry_ctls_low,
vmx->nested.nested_vmx_entry_ctls_high))
{
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
- return 1;
+ goto out;
}
if (((vmcs12->host_cr0 & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON) ||
((vmcs12->host_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) {
nested_vmx_failValid(vcpu,
VMXERR_ENTRY_INVALID_HOST_STATE_FIELD);
- return 1;
+ goto out;
}
if (!nested_cr0_valid(vcpu, vmcs12->guest_cr0) ||
((vmcs12->guest_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) {
nested_vmx_entry_failure(vcpu, vmcs12,
EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT);
- return 1;
+ goto out;
}
if (vmcs12->vmcs_link_pointer != -1ull) {
nested_vmx_entry_failure(vcpu, vmcs12,
EXIT_REASON_INVALID_STATE, ENTRY_FAIL_VMCS_LINK_PTR);
- return 1;
+ goto out;
}
/*
* If the load IA32_EFER VM-entry control is 1, the following checks
* are performed on the field for the IA32_EFER MSR:
* - Bits reserved in the IA32_EFER MSR must be 0.
* - Bit 10 (corresponding to IA32_EFER.LMA) must equal the value of
* the IA-32e mode guest VM-exit control. It must also be identical
@@ -10150,17 +10163,17 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER) {
ia32e = (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) != 0;
if (!kvm_valid_efer(vcpu, vmcs12->guest_ia32_efer) ||
ia32e != !!(vmcs12->guest_ia32_efer & EFER_LMA) ||
((vmcs12->guest_cr0 & X86_CR0_PG) &&
ia32e != !!(vmcs12->guest_ia32_efer & EFER_LME))) {
nested_vmx_entry_failure(vcpu, vmcs12,
EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT);
- return 1;
+ goto out;
}
}
/*
* If the load IA32_EFER VM-exit control is 1, bits reserved in the
* IA32_EFER MSR must be 0 in the field for that register. In addition,
* the values of the LMA and LME bits in the field must each be that of
* the host address-space size VM-exit control.
@@ -10168,29 +10181,30 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER) {
ia32e = (vmcs12->vm_exit_controls &
VM_EXIT_HOST_ADDR_SPACE_SIZE) != 0;
if (!kvm_valid_efer(vcpu, vmcs12->host_ia32_efer) ||
ia32e != !!(vmcs12->host_ia32_efer & EFER_LMA) ||
ia32e != !!(vmcs12->host_ia32_efer & EFER_LME)) {
nested_vmx_entry_failure(vcpu, vmcs12,
EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT);
- return 1;
+ goto out;
}
}
/*
* We're finally done with prerequisite checking, and can start with
* the nested entry.
*/
vmcs02 = nested_get_current_vmcs02(vmx);
if (!vmcs02)
return -ENOMEM;
+ skip_emulated_instruction_no_trap(vcpu);
enter_guest_mode(vcpu);
if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS))
vmx->nested.vmcs01_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
cpu = get_cpu();
vmx->loaded_vmcs = vmcs02;
vmx_vcpu_put(vcpu);
@@ -10222,16 +10236,20 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
/*
* Note no nested_vmx_succeed or nested_vmx_fail here. At this point
* we are no longer running L1, and VMLAUNCH/VMRESUME has not yet
* returned as far as L1 is concerned. It will only return (and set
* the success flag) when L2 exits (see nested_vmx_vmexit()).
*/
return 1;
+
+out:
+ skip_emulated_instruction(vcpu);
+ return 1;
}
/*
* On a nested exit from L2 to L1, vmcs12.guest_cr0 might not be up-to-date
* because L2 may have changed some cr0 bits directly (CRO_GUEST_HOST_MASK).
* This function returns the new value we should put in vmcs12.guest_cr0.
* It's not enough to just return the vmcs02 GUEST_CR0. Rather,
* 1. Bits that neither L0 nor L1 trapped, were set directly by L2 and are now
--
2.10.2
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