From: Glauber Costa Date: Thu, 10 Jul 2008 20:08:15 +0000 (-0300) Subject: KVM: x86 emulator: emulate clflush X-Git-Tag: v2.6.27-rc1~968^2~2 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=2a7c5b8b550b1fb1db9eb490420132e637f5dcb4;p=linux-2.6-omap-h63xx.git 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 Signed-off-by: Avi Kivity --- 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