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    Subject[PATCH 7/9] KVM: SVM: Add intercept checks for one-byte instructions
    Date
    This patch add intercept checks for emulated one-byte
    instructions to the KVM instruction emulation path.

    Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
    ---
    arch/x86/kvm/svm.c | 36 +++++++++++++++++++++++++++++++++---
    1 files changed, 33 insertions(+), 3 deletions(-)

    diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    index 77b344e..2a30b5b 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -3668,6 +3668,35 @@ static void svm_check_group7(struct vmcb *vmcb, struct x86_emulate_ctxt *ctxt)
    }
    }

    +static void svm_check_onebyte(struct vmcb *vmcb, struct x86_emulate_ctxt *ctxt)
    +{
    + struct decode_cache *c = &ctxt->decode;
    +
    + switch (c->b) {
    + case 0x90: /* PAUSE */
    + if (c->rep_prefix == REPE_PREFIX)
    + vmcb->control.exit_code = SVM_EXIT_PAUSE;
    + break;
    + case 0x9c: /* PUSHF */
    + break;
    + case 0x9d: /* POPF */
    + vmcb->control.exit_code = SVM_EXIT_POPF;
    + break;
    + case 0xcd: /* INTn */
    + vmcb->control.exit_code = SVM_EXIT_SWINT;
    + break;
    + case 0xcf: /* IRET */
    + vmcb->control.exit_code = SVM_EXIT_IRET;
    + break;
    + case 0xf1: /* ICEBP */
    + vmcb->control.exit_code = SVM_EXIT_ICEBP;
    + break;
    + case 0xf4: /* HLT */
    + vmcb->control.exit_code = SVM_EXIT_HLT;
    + break;
    + }
    +}
    +
    static int svm_insn_intercepted(struct kvm_vcpu *vcpu,
    struct x86_emulate_ctxt *ctxt)
    {
    @@ -3681,8 +3710,10 @@ static int svm_insn_intercepted(struct kvm_vcpu *vcpu,

    ret = X86EMUL_CONTINUE;

    - if (!c->twobyte)
    + if (!c->twobyte) {
    + svm_check_onebyte(vmcb, ctxt);
    goto out;
    + }

    switch (c->b) {
    case 0x00:
    @@ -3799,14 +3830,13 @@ static int svm_insn_intercepted(struct kvm_vcpu *vcpu,
    break;
    }

    +out:
    vmcb->control.next_rip = ctxt->eip;
    vmexit = nested_svm_exit_handled(svm);

    ret = (vmexit == NESTED_EXIT_DONE) ? X86EMUL_INTERCEPTED
    : X86EMUL_CONTINUE;

    -out:
    -
    return ret;
    }

    --
    1.7.1



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