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Commit 98f73630 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: x86: emulate SAHF instruction 



Yet another instruction that we fail to emulate, this time found
in Windows 2008R2 32-bit.

Reviewed-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent a94b40a6

arch/x86/kvm/emulate.c

+14 −1
Original line number Original line Diff line number Diff line
@@ -3296,6 +3296,18 @@ static int em_cpuid(struct x86_emulate_ctxt *ctxt) 
	return X86EMUL_CONTINUE;

	return X86EMUL_CONTINUE;

}

}





static int em_sahf(struct x86_emulate_ctxt *ctxt)

{

	u32 flags;



	flags = EFLG_CF | EFLG_PF | EFLG_AF | EFLG_ZF | EFLG_SF;

	flags &= *reg_rmw(ctxt, VCPU_REGS_RAX) >> 8;



	ctxt->eflags &= ~0xffUL;

	ctxt->eflags |= flags | X86_EFLAGS_FIXED;

	return X86EMUL_CONTINUE;

}



static int em_lahf(struct x86_emulate_ctxt *ctxt)

static int em_lahf(struct x86_emulate_ctxt *ctxt)

{

{

	*reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL;

	*reg_rmw(ctxt, VCPU_REGS_RAX) &= ~0xff00UL;
@@ -3790,7 +3802,8 @@ static const struct opcode opcode_table[256] = { 
	D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),

	D(DstAcc | SrcNone), I(ImplicitOps | SrcAcc, em_cwd),

	I(SrcImmFAddr | No64, em_call_far), N,

	I(SrcImmFAddr | No64, em_call_far), N,

	II(ImplicitOps | Stack, em_pushf, pushf),

	II(ImplicitOps | Stack, em_pushf, pushf),

	II(ImplicitOps | Stack, em_popf, popf), N, I(ImplicitOps, em_lahf),

	II(ImplicitOps | Stack, em_popf, popf),

	I(ImplicitOps, em_sahf), I(ImplicitOps, em_lahf),

	/* 0xA0 - 0xA7 */

	/* 0xA0 - 0xA7 */

	I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),

	I2bv(DstAcc | SrcMem | Mov | MemAbs, em_mov),

	I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov),

	I2bv(DstMem | SrcAcc | Mov | MemAbs | PageTable, em_mov),