Commit 0a37027e authored Jul 11, 2014 by Alex Williamson Committed by Paolo Bonzini Aug 29, 2014

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 <alex.williamson@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 0f54a321

arch/x86/kvm/emulate.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -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
		};