KVM: Emulate multibyte NOP
This is encountered when booting RHEL5.9 64-bit. There is another bug after this one that is not a simple emulation failure, but this one lets the boot proceed a bit. Cc: <stable@vger.kernel.org> # 3.9 Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Gleb Natapov <gleb@redhat.com>
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@ -3997,7 +3997,8 @@ static const struct opcode twobyte_table[256] = {
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DI(ImplicitOps | Priv, invd), DI(ImplicitOps | Priv, wbinvd), N, N,
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N, D(ImplicitOps | ModRM), N, N,
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/* 0x10 - 0x1F */
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N, N, N, N, N, N, N, N, D(ImplicitOps | ModRM), N, N, N, N, N, N, N,
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N, N, N, N, N, N, N, N,
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D(ImplicitOps | ModRM), N, N, N, N, N, N, D(ImplicitOps | ModRM),
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/* 0x20 - 0x2F */
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DIP(ModRM | DstMem | Priv | Op3264, cr_read, check_cr_read),
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DIP(ModRM | DstMem | Priv | Op3264, dr_read, check_dr_read),
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@ -4836,6 +4837,7 @@ twobyte_insn:
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case 0x08: /* invd */
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case 0x0d: /* GrpP (prefetch) */
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case 0x18: /* Grp16 (prefetch/nop) */
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case 0x1f: /* nop */
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break;
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case 0x20: /* mov cr, reg */
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ctxt->dst.val = ops->get_cr(ctxt, ctxt->modrm_reg);
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