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Commit dca7f128 authored by Sean Christopherson's avatar Sean Christopherson Committed by Paolo Bonzini
Browse files

KVM: x86: add kvm_fast_pio() to consolidate fast PIO code 



Add kvm_fast_pio() to consolidate duplicate code in VMX and SVM.
Unexport kvm_fast_pio_in() and kvm_fast_pio_out().

Suggested-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarSean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 432baf60

arch/x86/include/asm/kvm_host.h

+1 −2
Original line number Diff line number Diff line
@@ -1210,8 +1210,7 @@ int kvm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr); 


struct x86_emulate_ctxt;



int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port);

int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, unsigned short port);

int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in);

int kvm_emulate_cpuid(struct kvm_vcpu *vcpu);

int kvm_emulate_halt(struct kvm_vcpu *vcpu);

int kvm_vcpu_halt(struct kvm_vcpu *vcpu);

arch/x86/kvm/svm.c

+2 −10
Original line number Diff line number Diff line
@@ -2640,7 +2640,7 @@ static int io_interception(struct vcpu_svm *svm) 
{

	struct kvm_vcpu *vcpu = &svm->vcpu;

	u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */

	int size, in, string, ret;

	int size, in, string;

	unsigned port;



	++svm->vcpu.stat.io_exits;
@@ -2652,16 +2652,8 @@ static int io_interception(struct vcpu_svm *svm) 
	port = io_info >> 16;

	size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;

	svm->next_rip = svm->vmcb->control.exit_info_2;

	ret = kvm_skip_emulated_instruction(&svm->vcpu);



	/*

	 * TODO: we might be squashing a KVM_GUESTDBG_SINGLESTEP-triggered

	 * KVM_EXIT_DEBUG here.

	 */

	if (in)

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

	else

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

	return kvm_fast_pio(&svm->vcpu, size, port, in);

}



static int nmi_interception(struct vcpu_svm *svm)

arch/x86/kvm/vmx.c

+2 −11
Original line number Diff line number Diff line
@@ -6265,7 +6265,7 @@ 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, ret;

	int size, in, string;

	unsigned port;



	exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
@@ -6280,16 +6280,7 @@ static int handle_io(struct kvm_vcpu *vcpu) 
	size = (exit_qualification & 7) + 1;

	in = (exit_qualification & 8) != 0;



	ret = kvm_skip_emulated_instruction(vcpu);



	/*

	 * TODO: we might be squashing a KVM_GUESTDBG_SINGLESTEP-triggered

	 * KVM_EXIT_DEBUG here.

	 */

	if (in)

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

	else

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

	return kvm_fast_pio(vcpu, size, port, in);

}



static void

arch/x86/kvm/x86.c

+19 −4
Original line number Diff line number Diff line
@@ -6061,7 +6061,8 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, 
}

EXPORT_SYMBOL_GPL(x86_emulate_instruction);



int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)

static int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size,

			    unsigned short port)

{

	unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);

	int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt,
@@ -6070,7 +6071,6 @@ int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port) 
	vcpu->arch.pio.count = 0;

	return ret;

}

EXPORT_SYMBOL_GPL(kvm_fast_pio_out);



static int complete_fast_pio_in(struct kvm_vcpu *vcpu)

{
@@ -6094,7 +6094,8 @@ static int complete_fast_pio_in(struct kvm_vcpu *vcpu) 
	return 1;

}



int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, unsigned short port)

static int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size,

			   unsigned short port)

{

	unsigned long val;

	int ret;
@@ -6113,7 +6114,21 @@ int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, unsigned short port) 


	return 0;

}

EXPORT_SYMBOL_GPL(kvm_fast_pio_in);



int kvm_fast_pio(struct kvm_vcpu *vcpu, int size, unsigned short port, int in)

{

	int ret = kvm_skip_emulated_instruction(vcpu);



	/*

	 * TODO: we might be squashing a KVM_GUESTDBG_SINGLESTEP-triggered

	 * KVM_EXIT_DEBUG here.

	 */

	if (in)

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

	else

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

}

EXPORT_SYMBOL_GPL(kvm_fast_pio);



static int kvmclock_cpu_down_prep(unsigned int cpu)

{