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kvm: svm: Add kvm_fast_pio_in support

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Update the I/O interception support to add the kvm_fast_pio_in function
to speed up the in instruction similar to the out instruction.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Tom Lendacky
2016-11-23 12:01:50 -05:00
committed by Radim Krčmář
parent 147277540b
commit 8370c3d08b
3 changed files with 47 additions and 2 deletions
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5
arch/x86/kvm/svm.c
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@@ -2270,7 +2270,7 @@ static int io_interception(struct vcpu_svm *svm)
++svm->vcpu.stat.io_exits;
string = (io_info & SVM_IOIO_STR_MASK) != 0;
in = (io_info & SVM_IOIO_TYPE_MASK) != 0;
if (string || in)
if (string)
return emulate_instruction(vcpu, 0) == EMULATE_DONE;
port = io_info >> 16;
@@ -2278,7 +2278,8 @@ static int io_interception(struct vcpu_svm *svm)
svm->next_rip = svm->vmcb->control.exit_info_2;
skip_emulated_instruction(&svm->vcpu);
return kvm_fast_pio_out(vcpu, size, port);
return in ? kvm_fast_pio_in(vcpu, size, port)
: kvm_fast_pio_out(vcpu, size, port);
}
static int nmi_interception(struct vcpu_svm *svm)