[PATCH 43/50] KVM: x86 emulator: handle undecoded rex.b with r/m = 5 in certain cases

[Avi Kivity]

x86_64 does not decode rex.b in certain cases, where the r/m field = 5.

Signed-off-by: Avi Kivity <avi@xxxxxxxxxxxx>
---
 arch/x86/kvm/x86_emulate.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index 2808291..3721cfd 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -750,6 +750,7 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
 
 			switch (base_reg) {
 			case 5:
+			case 13:
 				if (c->modrm_mod != 0)
 					c->modrm_ea += c->regs[base_reg];
 				else
@@ -767,6 +768,7 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
 			}
 			break;
 		case 5:
+		case 13:
 			if (c->modrm_mod != 0)
 				c->modrm_ea += c->regs[c->modrm_rm];
 			else if (ctxt->mode == X86EMUL_MODE_PROT64)
-- 
1.5.6

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