[RFC PATCH v6 81/92] kvm: x86: emulate movq xmm, m64
From: Adalbert Lazăr <hidden>
Date: 2019-08-09 16:05:09
Also in:
kvm, linux-mm
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Mihai Donțu <redacted> This is needed in order to be able to support guest code that uses movq to write into pages that are marked for write tracking. Signed-off-by: Mihai Donțu <redacted> Signed-off-by: Adalbert Lazăr <redacted> --- arch/x86/kvm/emulate.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index b8a412b8b087..2297955d0934 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c@@ -1180,23 +1180,24 @@ static int em_fnstsw(struct x86_emulate_ctxt *ctxt) static u8 simd_prefix_to_bytes(const struct x86_emulate_ctxt *ctxt, int simd_prefix) { - u8 bytes; + u8 bytes = 16; switch (ctxt->b) { case 0x11: /* movss xmm, m32 */ /* movsd xmm, m64 */ /* movups xmm, m128 */ - if (simd_prefix == 0xf3) { + if (simd_prefix == 0xf3) bytes = 4; - break; - } else if (simd_prefix == 0xf2) { + else if (simd_prefix == 0xf2) bytes = 8; - break; - } - /* fallthrough */ + break; + case 0xd6: + /* movq xmm, m64 */ + if (simd_prefix == 0x66) + bytes = 8; + break; default: - bytes = 16; break; } return bytes;
@@ -4549,6 +4550,10 @@ static const struct instr_dual instr_dual_0f_2b = { I(0, em_mov), N }; +static const struct gprefix pfx_0f_d6 = { + N, I(0, em_mov), N, N, +}; + static const struct gprefix pfx_0f_2b = { ID(0, &instr_dual_0f_2b), ID(0, &instr_dual_0f_2b), N, N, };
@@ -4846,7 +4851,8 @@ static const struct opcode twobyte_table[256] = { /* 0xC8 - 0xCF */ X8(I(DstReg, em_bswap)), /* 0xD0 - 0xDF */ - N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, + N, N, N, N, N, N, GP(ModRM | SrcReg | DstMem | Mov | Sse, &pfx_0f_d6), + N, N, N, N, N, N, N, N, N, /* 0xE0 - 0xEF */ N, N, N, N, N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_e7), N, N, N, N, N, N, N, N,
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