mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-12-27 12:21:22 -05:00
Code Issues Packages Projects Releases Wiki Activity

KVM: x86: Enable support for emulating AVX MOV instructions

Browse Source 
Some users of KVM have emulated devices (typically added to private
forks of QEMU) that execute AVX instructions on PCI BARs.  Whenever
the guest OS tries to do that, an illegal instruction exception or
emulation failure is triggered.

Add the Avx flag to move instructions:
- (66) 0f 10 - MOVUPS/MOVUPD from memory
- (66) 0f 11 - MOVUPS/MOVUPD to memory
- 66 0f 6f - MOVDQA from memory
- 66 0f 7f - MOVDQA to memory
- f3 0f 6f - MOVDQU from memory
- f3 0f 7f - MOVDQU to memory
- (66) 0f 28 - MOVAPS/MOVAPD from memory
- (66) 0f 29 - MOVAPS/MOVAPD to memory
- (66) 0f 2b - MOVNTPS/MOVNTPD to memory
- 66 0f e7 - MOVNTDQ to memory
- 66 0f 38 2a - MOVNTDQA to memory

Co-developed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Link: https://lore.kernel.org/kvm/BD108C42-0382-4B17-B601-434A4BD038E7@fb.com/T/
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://patch.msgid.link/20251114003633.60689-11-pbonzini@redhat.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Paolo Bonzini
2025-11-13 19:36:33 -05:00
committed by Sean Christopherson
parent f0585a714a
commit ebec25438f
1 changed files with 7 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
arch/x86/kvm/emulate.c
View File

@@ -4121,7 +4121,7 @@ static const struct group_dual group15 = { {
} };
static const struct gprefix pfx_0f_6f_0f_7f = {
I(Mmx, em_mov), I(Sse | Aligned, em_mov), N, I(Sse | Unaligned, em_mov),
I(Mmx, em_mov), I(Sse | Avx | Aligned, em_mov), N, I(Sse | Avx | Unaligned, em_mov),
};
static const struct instr_dual instr_dual_0f_2b = {
@@ -4141,7 +4141,7 @@ static const struct gprefix pfx_0f_28_0f_29 = {
};
static const struct gprefix pfx_0f_e7_0f_38_2a = {
N, I(Sse, em_mov), N, N,
N, I(Sse | Avx, em_mov), N, N,
};
static const struct escape escape_d9 = { {
@@ -4354,8 +4354,8 @@ static const struct opcode twobyte_table[256] = {
DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N,
N, D(ImplicitOps | ModRM | SrcMem | NoAccess), N, N,
/* 0x10 - 0x1F */
GP(ModRM | DstReg | SrcMem | Mov | Sse, &pfx_0f_10_0f_11),
GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_10_0f_11),
GP(ModRM | DstReg | SrcMem | Mov | Sse | Avx, &pfx_0f_10_0f_11),
GP(ModRM | DstMem | SrcReg | Mov | Sse | Avx, &pfx_0f_10_0f_11),
N, N, N, N, N, N,
D(ImplicitOps | ModRM | SrcMem | NoAccess), /* 4 * prefetch + 4 * reserved NOP */
D(ImplicitOps | ModRM | SrcMem | NoAccess), N, N,
@@ -4371,9 +4371,9 @@ static const struct opcode twobyte_table[256] = {
IIP(ModRM | SrcMem | Priv | Op3264 | NoMod, em_dr_write, dr_write,
check_dr_write),
N, N, N, N,
GP(ModRM | DstReg | SrcMem | Mov | Sse, &pfx_0f_28_0f_29),
GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_28_0f_29),
N, GP(ModRM | DstMem | SrcReg | Mov | Sse, &pfx_0f_2b),
GP(ModRM | DstReg | SrcMem | Mov | Sse | Avx, &pfx_0f_28_0f_29),
GP(ModRM | DstMem | SrcReg | Mov | Sse | Avx, &pfx_0f_28_0f_29),
N, GP(ModRM | DstMem | SrcReg | Mov | Sse | Avx, &pfx_0f_2b),
N, N, N, N,
/* 0x30 - 0x3F */
II(ImplicitOps | Priv, em_wrmsr, wrmsr),