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authorGlauber Costa <gcosta@redhat.com>2008-07-10 17:08:15 -0300
committerAvi Kivity <avi@qumranet.com>2008-07-20 12:42:40 +0300
commit2a7c5b8b550b1fb1db9eb490420132e637f5dcb4 (patch)
tree49ee4d514e9af781bec31ff8f07f9d8a5687a6b6
parent376c53c2b30d4a1955240f59f4ecd959aa118f92 (diff)
KVM: x86 emulator: emulate clflush
If the guest issues a clflush in a mmio address, the instruction can trap into the hypervisor. Currently, we do not decode clflush properly, causing the guest to hang. This patch fixes this emulating clflush (opcode 0f ae). Signed-off-by: Glauber Costa <gcosta@redhat.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
-rw-r--r--arch/x86/kvm/x86_emulate.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86_emulate.c b/arch/x86/kvm/x86_emulate.c
index 8bc63f62fbb..f2f90468f8b 100644
--- a/arch/x86/kvm/x86_emulate.c
+++ b/arch/x86/kvm/x86_emulate.c
@@ -219,7 +219,7 @@ static u16 twobyte_table[256] = {
/* 0xA0 - 0xA7 */
0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, 0, 0,
/* 0xA8 - 0xAF */
- 0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, 0, 0,
+ 0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, ModRM, 0,
/* 0xB0 - 0xB7 */
ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, 0,
DstMem | SrcReg | ModRM | BitOp,
@@ -1947,6 +1947,8 @@ twobyte_insn:
c->src.val &= (c->dst.bytes << 3) - 1;
emulate_2op_SrcV_nobyte("bts", c->src, c->dst, ctxt->eflags);
break;
+ case 0xae: /* clflush */
+ break;
case 0xb0 ... 0xb1: /* cmpxchg */
/*
* Save real source value, then compare EAX against