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Subject[PATCH 8/9] KVM: SVM: Add checks for IO instructions
Date
This patch adds code to check for IOIO intercepts on
instructions decoded by the KVM instruction emulator.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kvm/svm.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 2a30b5b..a2c513d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -3668,6 +3668,47 @@ static void svm_check_group7(struct vmcb *vmcb, struct x86_emulate_ctxt *ctxt)
}
}

+static void svm_check_ioio(struct vmcb *vmcb, struct x86_emulate_ctxt *ctxt)
+{
+ struct decode_cache *c;
+ u32 bytes, seg;
+ u32 exit_info;
+
+ c = &ctxt->decode;
+ /* Encode Port */
+ exit_info = (c->regs[VCPU_REGS_RDX] & 0xffff) << 16;
+ seg = 0;
+
+ /* Encode Address Size */
+ exit_info |= (u32)c->ad_bytes << (SVM_IOIO_ASIZE_SHIFT - 1);
+
+ if (c->rep_prefix)
+ exit_info |= SVM_IOIO_REP_MASK;
+
+ if ((c->b & 0x06) == 0x06) {
+ /* OUT* Instruction */
+ bytes = c->dst.bytes;
+ } else {
+ /* IN* Instruction */
+ bytes = c->src.bytes;
+ exit_info |= SVM_IOIO_TYPE_MASK;
+ }
+
+ /* Encode Data Size */
+ bytes = min(bytes, 4u);
+ exit_info |= bytes << SVM_IOIO_SIZE_SHIFT;
+
+ /* Check for the string variants */
+ if ((c->b & 0xf0) == 0x60) {
+ exit_info |= SVM_IOIO_STR_MASK;
+ exit_info |= (seg & 0x07) << 10;
+ }
+
+ vmcb->control.exit_info_1 = exit_info;
+ vmcb->control.exit_info_2 = ctxt->eip;
+ vmcb->control.exit_code = SVM_EXIT_IOIO;
+}
+
static void svm_check_onebyte(struct vmcb *vmcb, struct x86_emulate_ctxt *ctxt)
{
struct decode_cache *c = &ctxt->decode;
@@ -3685,6 +3726,20 @@ static void svm_check_onebyte(struct vmcb *vmcb, struct x86_emulate_ctxt *ctxt)
case 0xcd: /* INTn */
vmcb->control.exit_code = SVM_EXIT_SWINT;
break;
+ case 0x6c: /* INS */
+ case 0x6d:
+ case 0xe4: /* IN */
+ case 0xe5:
+ case 0xec:
+ case 0xed:
+ case 0x6e: /* OUTS */
+ case 0x6f:
+ case 0xe6: /* OUT */
+ case 0xe7:
+ case 0xee:
+ case 0xef:
+ svm_check_ioio(vmcb, ctxt);
+ break;
case 0xcf: /* IRET */
vmcb->control.exit_code = SVM_EXIT_IRET;
break;
--
1.7.1



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