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Commit eb277562 authored by Kyle Huey's avatar Kyle Huey Committed by Paolo Bonzini
Browse files

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 separate call to
skip_emulated_instruction that will later not be converted to the variant
that checks the singlestep flag.

Signed-off-by: default avatarKyle Huey <khuey@kylehuey.com>
Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
parent 09ca3f20

arch/x86/kvm/vmx.c

+33 −20
Original line number Diff line number Diff line
@@ -7324,7 +7324,6 @@ 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;
@@ -7338,9 +7337,13 @@ static int handle_vmread(struct kvm_vcpu *vcpu) 
	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));
@@ -7388,10 +7391,14 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu) 
	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));
@@ -10046,11 +10053,12 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
	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)
@@ -10070,33 +10078,33 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool 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,
@@ -10116,26 +10124,26 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
				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;

	}



	/*
@@ -10155,7 +10163,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
		     ia32e != !!(vmcs12->guest_ia32_efer & EFER_LME))) {

			nested_vmx_entry_failure(vcpu, vmcs12,

				EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT);

			return 1;

			goto out;

		}

	}
@@ -10173,7 +10181,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
		    ia32e != !!(vmcs12->host_ia32_efer & EFER_LME)) {

			nested_vmx_entry_failure(vcpu, vmcs12,

				EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT);

			return 1;

			goto out;

		}

	}
@@ -10186,6 +10194,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
	if (!vmcs02)

		return -ENOMEM;



	skip_emulated_instruction(vcpu);

	enter_guest_mode(vcpu);



	if (!(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS))
@@ -10227,6 +10236,10 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
	 * the success flag) when L2 exits (see nested_vmx_vmexit()).

	 */

	return 1;



out:

	skip_emulated_instruction(vcpu);

	return 1;

}



/*