Commit 6affcbed authored by Kyle Huey's avatar Kyle Huey Committed by Paolo Bonzini
Browse files

KVM: x86: Add kvm_skip_emulated_instruction and use it. 



kvm_skip_emulated_instruction calls both
kvm_x86_ops->skip_emulated_instruction and kvm_vcpu_check_singlestep,
skipping the emulated instruction and generating a trap if necessary.

Replacing skip_emulated_instruction calls with
kvm_skip_emulated_instruction is straightforward, except for:

- ICEBP, which is already inside a trap, so avoid triggering another trap.
- Instructions that can trigger exits to userspace, such as the IO insns,
  MOVs to CR8, and HALT. If kvm_skip_emulated_instruction does trigger a
  KVM_GUESTDBG_SINGLESTEP exit, and the handling code for
  IN/OUT/MOV CR8/HALT also triggers an exit to userspace, the latter will
  take precedence. The singlestep will be triggered again on the next
  instruction, which is the current behavior.
- Task switch instructions which would require additional handling (e.g.
  the task switch bit) and are instead left alone.
- Cases where VMLAUNCH/VMRESUME do not proceed to the next instruction,
  which do not trigger singlestep traps as mentioned previously.

Signed-off-by: default avatarKyle Huey <khuey@kylehuey.com>
Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
parent eb277562

arch/x86/include/asm/kvm_host.h

+2 −1
Original line number Diff line number Diff line
@@ -1368,7 +1368,8 @@ void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, 
bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu);

extern bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn);



void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err);

int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu);

int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err);



int kvm_is_in_guest(void);

arch/x86/kvm/cpuid.c

+1 −2
Original line number Diff line number Diff line
@@ -890,7 +890,6 @@ int kvm_emulate_cpuid(struct kvm_vcpu *vcpu) 
	kvm_register_write(vcpu, VCPU_REGS_RBX, ebx);

	kvm_register_write(vcpu, VCPU_REGS_RCX, ecx);

	kvm_register_write(vcpu, VCPU_REGS_RDX, edx);

	kvm_x86_ops->skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}

EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);

arch/x86/kvm/svm.c

+3 −8
Original line number Diff line number Diff line
@@ -3151,8 +3151,7 @@ static int skinit_interception(struct vcpu_svm *svm) 


static int wbinvd_interception(struct vcpu_svm *svm)

{

	kvm_emulate_wbinvd(&svm->vcpu);

	return 1;

	return kvm_emulate_wbinvd(&svm->vcpu);

}



static int xsetbv_interception(struct vcpu_svm *svm)
@@ -3275,9 +3274,7 @@ static int rdpmc_interception(struct vcpu_svm *svm) 
		return emulate_on_interception(svm);



	err = kvm_rdpmc(&svm->vcpu);

	kvm_complete_insn_gp(&svm->vcpu, err);



	return 1;

	return kvm_complete_insn_gp(&svm->vcpu, err);

}



static bool check_selective_cr0_intercepted(struct vcpu_svm *svm,
@@ -3374,9 +3371,7 @@ static int cr_interception(struct vcpu_svm *svm) 
		}

		kvm_register_write(&svm->vcpu, reg, val);

	}

	kvm_complete_insn_gp(&svm->vcpu, err);



	return 1;

	return kvm_complete_insn_gp(&svm->vcpu, err);

}



static int dr_interception(struct vcpu_svm *svm)

arch/x86/kvm/vmx.c

+72 −105
Original line number Diff line number Diff line
@@ -5556,7 +5556,7 @@ static int handle_triple_fault(struct kvm_vcpu *vcpu) 
static int handle_io(struct kvm_vcpu *vcpu)

{

	unsigned long exit_qualification;

	int size, in, string;

	int size, in, string, ret;

	unsigned port;



	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
@@ -5570,9 +5570,14 @@ static int handle_io(struct kvm_vcpu *vcpu) 


	port = exit_qualification >> 16;

	size = (exit_qualification & 7) + 1;

	skip_emulated_instruction(vcpu);



	return kvm_fast_pio_out(vcpu, size, port);

	ret = kvm_skip_emulated_instruction(vcpu);



	/*

	 * TODO: we might be squashing a KVM_GUESTDBG_SINGLESTEP-triggered

	 * KVM_EXIT_DEBUG here.

	 */

	return kvm_fast_pio_out(vcpu, size, port) && ret;

}



static void
@@ -5670,6 +5675,7 @@ static int handle_cr(struct kvm_vcpu *vcpu) 
	int cr;

	int reg;

	int err;

	int ret;



	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);

	cr = exit_qualification & 15;
@@ -5681,25 +5687,27 @@ static int handle_cr(struct kvm_vcpu *vcpu) 
		switch (cr) {

		case 0:

			err = handle_set_cr0(vcpu, val);

			kvm_complete_insn_gp(vcpu, err);

			return 1;

			return kvm_complete_insn_gp(vcpu, err);

		case 3:

			err = kvm_set_cr3(vcpu, val);

			kvm_complete_insn_gp(vcpu, err);

			return 1;

			return kvm_complete_insn_gp(vcpu, err);

		case 4:

			err = handle_set_cr4(vcpu, val);

			kvm_complete_insn_gp(vcpu, err);

			return 1;

			return kvm_complete_insn_gp(vcpu, err);

		case 8: {

				u8 cr8_prev = kvm_get_cr8(vcpu);

				u8 cr8 = (u8)val;

				err = kvm_set_cr8(vcpu, cr8);

				kvm_complete_insn_gp(vcpu, err);

				ret = kvm_complete_insn_gp(vcpu, err);

				if (lapic_in_kernel(vcpu))

					return 1;

					return ret;

				if (cr8_prev <= cr8)

					return 1;

					return ret;

				/*

				 * TODO: we might be squashing a

				 * KVM_GUESTDBG_SINGLESTEP-triggered

				 * KVM_EXIT_DEBUG here.

				 */

				vcpu->run->exit_reason = KVM_EXIT_SET_TPR;

				return 0;

			}
@@ -5709,22 +5717,19 @@ static int handle_cr(struct kvm_vcpu *vcpu) 
		handle_clts(vcpu);

		trace_kvm_cr_write(0, kvm_read_cr0(vcpu));

		vmx_fpu_activate(vcpu);

		skip_emulated_instruction(vcpu);

		return 1;

		return kvm_skip_emulated_instruction(vcpu);

	case 1: /*mov from cr*/

		switch (cr) {

		case 3:

			val = kvm_read_cr3(vcpu);

			kvm_register_write(vcpu, reg, val);

			trace_kvm_cr_read(cr, val);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		case 8:

			val = kvm_get_cr8(vcpu);

			kvm_register_write(vcpu, reg, val);

			trace_kvm_cr_read(cr, val);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}

		break;

	case 3: /* lmsw */
@@ -5732,8 +5737,7 @@ static int handle_cr(struct kvm_vcpu *vcpu) 
		trace_kvm_cr_write(0, (kvm_read_cr0(vcpu) & ~0xful) | val);

		kvm_lmsw(vcpu, val);



		skip_emulated_instruction(vcpu);

		return 1;

		return kvm_skip_emulated_instruction(vcpu);

	default:

		break;

	}
@@ -5804,8 +5808,7 @@ static int handle_dr(struct kvm_vcpu *vcpu) 
		if (kvm_set_dr(vcpu, dr, kvm_register_readl(vcpu, reg)))

			return 1;



	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



static u64 vmx_get_dr6(struct kvm_vcpu *vcpu)
@@ -5858,8 +5861,7 @@ static int handle_rdmsr(struct kvm_vcpu *vcpu) 
	/* FIXME: handling of bits 32:63 of rax, rdx */

	vcpu->arch.regs[VCPU_REGS_RAX] = msr_info.data & -1u;

	vcpu->arch.regs[VCPU_REGS_RDX] = (msr_info.data >> 32) & -1u;

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



static int handle_wrmsr(struct kvm_vcpu *vcpu)
@@ -5879,8 +5881,7 @@ static int handle_wrmsr(struct kvm_vcpu *vcpu) 
	}



	trace_kvm_msr_write(ecx, data);

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu)
@@ -5924,8 +5925,7 @@ static int handle_invlpg(struct kvm_vcpu *vcpu) 
	unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);



	kvm_mmu_invlpg(vcpu, exit_qualification);

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



static int handle_rdpmc(struct kvm_vcpu *vcpu)
@@ -5933,15 +5933,12 @@ static int handle_rdpmc(struct kvm_vcpu *vcpu) 
	int err;



	err = kvm_rdpmc(vcpu);

	kvm_complete_insn_gp(vcpu, err);



	return 1;

	return kvm_complete_insn_gp(vcpu, err);

}



static int handle_wbinvd(struct kvm_vcpu *vcpu)

{

	kvm_emulate_wbinvd(vcpu);

	return 1;

	return kvm_emulate_wbinvd(vcpu);

}



static int handle_xsetbv(struct kvm_vcpu *vcpu)
@@ -5950,20 +5947,20 @@ static int handle_xsetbv(struct kvm_vcpu *vcpu) 
	u32 index = kvm_register_read(vcpu, VCPU_REGS_RCX);



	if (kvm_set_xcr(vcpu, index, new_bv) == 0)

		skip_emulated_instruction(vcpu);

		return kvm_skip_emulated_instruction(vcpu);

	return 1;

}



static int handle_xsaves(struct kvm_vcpu *vcpu)

{

	skip_emulated_instruction(vcpu);

	kvm_skip_emulated_instruction(vcpu);

	WARN(1, "this should never happen\n");

	return 1;

}



static int handle_xrstors(struct kvm_vcpu *vcpu)

{

	skip_emulated_instruction(vcpu);

	kvm_skip_emulated_instruction(vcpu);

	WARN(1, "this should never happen\n");

	return 1;

}
@@ -5984,8 +5981,7 @@ static int handle_apic_access(struct kvm_vcpu *vcpu) 
		if ((access_type == TYPE_LINEAR_APIC_INST_WRITE) &&

		    (offset == APIC_EOI)) {

			kvm_lapic_set_eoi(vcpu);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}

	}

	return emulate_instruction(vcpu, 0) == EMULATE_DONE;
@@ -6134,8 +6130,7 @@ static int handle_ept_misconfig(struct kvm_vcpu *vcpu) 
	gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);

	if (!kvm_io_bus_write(vcpu, KVM_FAST_MMIO_BUS, gpa, 0, NULL)) {

		trace_kvm_fast_mmio(gpa);

		skip_emulated_instruction(vcpu);

		return 1;

		return kvm_skip_emulated_instruction(vcpu);

	}



	ret = handle_mmio_page_fault(vcpu, gpa, true);
@@ -6508,15 +6503,12 @@ static int handle_pause(struct kvm_vcpu *vcpu) 
		grow_ple_window(vcpu);



	kvm_vcpu_on_spin(vcpu);

	skip_emulated_instruction(vcpu);



	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



static int handle_nop(struct kvm_vcpu *vcpu)

{

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



static int handle_mwait(struct kvm_vcpu *vcpu)
@@ -6823,8 +6815,7 @@ static int nested_vmx_check_vmptr(struct kvm_vcpu *vcpu, int exit_reason, 
		 */

		if (!PAGE_ALIGNED(vmptr) || (vmptr >> maxphyaddr)) {

			nested_vmx_failInvalid(vcpu);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}



		page = nested_get_page(vcpu, vmptr);
@@ -6832,8 +6823,7 @@ static int nested_vmx_check_vmptr(struct kvm_vcpu *vcpu, int exit_reason, 
		    *(u32 *)kmap(page) != VMCS12_REVISION) {

			nested_vmx_failInvalid(vcpu);

			kunmap(page);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}

		kunmap(page);

		vmx->nested.vmxon_ptr = vmptr;
@@ -6842,30 +6832,26 @@ static int nested_vmx_check_vmptr(struct kvm_vcpu *vcpu, int exit_reason, 
		if (!PAGE_ALIGNED(vmptr) || (vmptr >> maxphyaddr)) {

			nested_vmx_failValid(vcpu,

					     VMXERR_VMCLEAR_INVALID_ADDRESS);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}



		if (vmptr == vmx->nested.vmxon_ptr) {

			nested_vmx_failValid(vcpu,

					     VMXERR_VMCLEAR_VMXON_POINTER);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}

		break;

	case EXIT_REASON_VMPTRLD:

		if (!PAGE_ALIGNED(vmptr) || (vmptr >> maxphyaddr)) {

			nested_vmx_failValid(vcpu,

					     VMXERR_VMPTRLD_INVALID_ADDRESS);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}



		if (vmptr == vmx->nested.vmxon_ptr) {

			nested_vmx_failValid(vcpu,

					     VMXERR_VMCLEAR_VMXON_POINTER);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}

		break;

	default:
@@ -6921,8 +6907,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu) 


	if (vmx->nested.vmxon) {

		nested_vmx_failValid(vcpu, VMXERR_VMXON_IN_VMX_ROOT_OPERATION);

		skip_emulated_instruction(vcpu);

		return 1;

		return kvm_skip_emulated_instruction(vcpu);

	}



	if ((vmx->msr_ia32_feature_control & VMXON_NEEDED_FEATURES)
@@ -6963,8 +6948,7 @@ static int handle_vmon(struct kvm_vcpu *vcpu) 
	vmx->nested.vmxon = true;



	nested_vmx_succeed(vcpu);

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);



out_shadow_vmcs:

	kfree(vmx->nested.cached_vmcs12);
@@ -7084,8 +7068,7 @@ static int handle_vmoff(struct kvm_vcpu *vcpu) 
		return 1;

	free_nested(to_vmx(vcpu));

	nested_vmx_succeed(vcpu);

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



/* Emulate the VMCLEAR instruction */
@@ -7125,8 +7108,7 @@ static int handle_vmclear(struct kvm_vcpu *vcpu) 
	nested_free_vmcs02(vmx, vmptr);



	nested_vmx_succeed(vcpu);

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch);
@@ -7340,18 +7322,15 @@ static int handle_vmread(struct kvm_vcpu *vcpu) 
	if (!nested_vmx_check_permission(vcpu))

		return 1;



	if (!nested_vmx_check_vmcs12(vcpu)) {

		skip_emulated_instruction(vcpu);

		return 1;

	}

	if (!nested_vmx_check_vmcs12(vcpu))

		return kvm_skip_emulated_instruction(vcpu);



	/* 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;

		return kvm_skip_emulated_instruction(vcpu);

	}

	/*

	 * Now copy part of this value to register or memory, as requested.
@@ -7371,8 +7350,7 @@ static int handle_vmread(struct kvm_vcpu *vcpu) 
	}



	nested_vmx_succeed(vcpu);

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}
@@ -7394,10 +7372,8 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu) 
	if (!nested_vmx_check_permission(vcpu))

		return 1;



	if (!nested_vmx_check_vmcs12(vcpu)) {

		skip_emulated_instruction(vcpu);

		return 1;

	}

	if (!nested_vmx_check_vmcs12(vcpu))

		return kvm_skip_emulated_instruction(vcpu);



	if (vmx_instruction_info & (1u << 10))

		field_value = kvm_register_readl(vcpu,
@@ -7418,19 +7394,16 @@ static int handle_vmwrite(struct kvm_vcpu *vcpu) 
	if (vmcs_field_readonly(field)) {

		nested_vmx_failValid(vcpu,

			VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT);

		skip_emulated_instruction(vcpu);

		return 1;

		return kvm_skip_emulated_instruction(vcpu);

	}



	if (vmcs12_write_any(vcpu, field, field_value) < 0) {

		nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);

		skip_emulated_instruction(vcpu);

		return 1;

		return kvm_skip_emulated_instruction(vcpu);

	}



	nested_vmx_succeed(vcpu);

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



/* Emulate the VMPTRLD instruction */
@@ -7451,8 +7424,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu) 
		page = nested_get_page(vcpu, vmptr);

		if (page == NULL) {

			nested_vmx_failInvalid(vcpu);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}

		new_vmcs12 = kmap(page);

		if (new_vmcs12->revision_id != VMCS12_REVISION) {
@@ -7460,8 +7432,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu) 
			nested_release_page_clean(page);

			nested_vmx_failValid(vcpu,

				VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}



		nested_release_vmcs12(vmx);
@@ -7485,8 +7456,7 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu) 
	}



	nested_vmx_succeed(vcpu);

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



/* Emulate the VMPTRST instruction */
@@ -7511,8 +7481,7 @@ static int handle_vmptrst(struct kvm_vcpu *vcpu) 
		return 1;

	}

	nested_vmx_succeed(vcpu);

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



/* Emulate the INVEPT instruction */
@@ -7550,8 +7519,7 @@ static int handle_invept(struct kvm_vcpu *vcpu) 
	if (type >= 32 || !(types & (1 << type))) {

		nested_vmx_failValid(vcpu,

				VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);

		skip_emulated_instruction(vcpu);

		return 1;

		return kvm_skip_emulated_instruction(vcpu);

	}



	/* According to the Intel VMX instruction reference, the memory
@@ -7582,8 +7550,7 @@ static int handle_invept(struct kvm_vcpu *vcpu) 
		break;

	}



	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



static int handle_invvpid(struct kvm_vcpu *vcpu)
@@ -7614,8 +7581,7 @@ static int handle_invvpid(struct kvm_vcpu *vcpu) 
	if (type >= 32 || !(types & (1 << type))) {

		nested_vmx_failValid(vcpu,

			VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);

		skip_emulated_instruction(vcpu);

		return 1;

		return kvm_skip_emulated_instruction(vcpu);

	}



	/* according to the intel vmx instruction reference, the memory
@@ -7637,23 +7603,20 @@ static int handle_invvpid(struct kvm_vcpu *vcpu) 
		if (!vpid) {

			nested_vmx_failValid(vcpu,

				VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);

			skip_emulated_instruction(vcpu);

			return 1;

			return kvm_skip_emulated_instruction(vcpu);

		}

		break;

	case VMX_VPID_EXTENT_ALL_CONTEXT:

		break;

	default:

		WARN_ON_ONCE(1);

		skip_emulated_instruction(vcpu);

		return 1;

		return kvm_skip_emulated_instruction(vcpu);

	}



	__vmx_flush_tlb(vcpu, vmx->nested.vpid02);

	nested_vmx_succeed(vcpu);



	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



static int handle_pml_full(struct kvm_vcpu *vcpu)
@@ -10194,6 +10157,11 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
	if (!vmcs02)

		return -ENOMEM;



	/*

	 * After this point, the trap flag no longer triggers a singlestep trap

	 * on the vm entry instructions. Don't call

	 * kvm_skip_emulated_instruction.

	 */

	skip_emulated_instruction(vcpu);

	enter_guest_mode(vcpu);
@@ -10238,8 +10206,7 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch) 
	return 1;



out:

	skip_emulated_instruction(vcpu);

	return 1;

	return kvm_skip_emulated_instruction(vcpu);

}



/*

arch/x86/kvm/x86.c

+25 −8
Original line number Diff line number Diff line
@@ -425,12 +425,14 @@ void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr) 
}

EXPORT_SYMBOL_GPL(kvm_requeue_exception);



void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)

int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)

{

	if (err)

		kvm_inject_gp(vcpu, 0);

	else

		kvm_x86_ops->skip_emulated_instruction(vcpu);

		return kvm_skip_emulated_instruction(vcpu);



	return 1;

}

EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
@@ -4813,8 +4815,8 @@ static int kvm_emulate_wbinvd_noskip(struct kvm_vcpu *vcpu) 


int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)

{

	kvm_x86_ops->skip_emulated_instruction(vcpu);

	return kvm_emulate_wbinvd_noskip(vcpu);

	kvm_emulate_wbinvd_noskip(vcpu);

	return kvm_skip_emulated_instruction(vcpu);

}

EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
@@ -5430,6 +5432,17 @@ static void kvm_vcpu_check_singlestep(struct kvm_vcpu *vcpu, unsigned long rflag 
	}

}



int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu)

{

	unsigned long rflags = kvm_x86_ops->get_rflags(vcpu);

	int r = EMULATE_DONE;



	kvm_x86_ops->skip_emulated_instruction(vcpu);

	kvm_vcpu_check_singlestep(vcpu, rflags, &r);

	return r == EMULATE_DONE;

}

EXPORT_SYMBOL_GPL(kvm_skip_emulated_instruction);



static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r)

{

	if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) &&
@@ -6007,8 +6020,12 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_halt); 


int kvm_emulate_halt(struct kvm_vcpu *vcpu)

{

	kvm_x86_ops->skip_emulated_instruction(vcpu);

	return kvm_vcpu_halt(vcpu);

	int ret = kvm_skip_emulated_instruction(vcpu);

	/*

	 * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered

	 * KVM_EXIT_DEBUG here.

	 */

	return kvm_vcpu_halt(vcpu) && ret;

}

EXPORT_SYMBOL_GPL(kvm_emulate_halt);
@@ -6039,9 +6056,9 @@ void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu) 
int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)

{

	unsigned long nr, a0, a1, a2, a3, ret;

	int op_64_bit, r = 1;

	int op_64_bit, r;



	kvm_x86_ops->skip_emulated_instruction(vcpu);

	r = kvm_skip_emulated_instruction(vcpu);



	if (kvm_hv_hypercall_enabled(vcpu->kvm))

		return kvm_hv_hypercall(vcpu);

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