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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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