From 0a37027e83f867793af0ccb9176a6b383dd0b7c8 Mon Sep 17 00:00:00 2001 From: Alex Williamson Date: Fri, 11 Jul 2014 11:56:31 -0600 Subject: [PATCH] KVM: x86 emulator: emulate MOVNTDQ Windows 8.1 guest with NVIDIA driver and GPU fails to boot with an emulation failure. The KVM spew suggests the fault is with lack of movntdq emulation (courtesy of Paolo): Code=02 00 00 b8 08 00 00 00 f3 0f 6f 44 0a f0 f3 0f 6f 4c 0a e0 <66> 0f e7 41 f0 66 0f e7 49 e0 48 83 e9 40 f3 0f 6f 44 0a 10 f3 0f 6f 0c 0a 66 0f e7 41 10 $ as -o a.out .section .text .byte 0x66, 0x0f, 0xe7, 0x41, 0xf0 .byte 0x66, 0x0f, 0xe7, 0x49, 0xe0 $ objdump -d a.out 0: 66 0f e7 41 f0 movntdq %xmm0,-0x10(%rcx) 5: 66 0f e7 49 e0 movntdq %xmm1,-0x20(%rcx) Add the necessary emulation. Signed-off-by: Alex Williamson Cc: Paolo Bonzini Signed-off-by: Paolo Bonzini --- arch/x86/kvm/emulate.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index a240fac..0892622 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -3696,6 +3696,10 @@ static const struct gprefix pfx_0f_28_0f_29 = { I(Aligned, em_mov), I(Aligned, em_mov), N, N, }; +static const struct gprefix pfx_0f_e7 = { + N, I(Sse, em_mov), N, N, +}; + static const struct escape escape_d9 = { { N, N, N, N, N, N, N, I(DstMem, em_fnstcw), }, { @@ -3966,7 +3970,8 @@ static const struct opcode twobyte_table[256] = { /* 0xD0 - 0xDF */ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, /* 0xE0 - 0xEF */ - N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, + N, N, N, N, N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_e7), + N, N, N, N, N, N, N, N, /* 0xF0 - 0xFF */ N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N }; -- 2.7.4