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Commit 6c6cb69b authored by Nadav Amit's avatar Nadav Amit Committed by Paolo Bonzini
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KVM: x86: Cleanup of rflags.rf cleaning 



RFLAGS.RF was cleaned in several functions (e.g., syscall) in the x86 emulator.
Now that we clear it before the execution of an instruction in the emulator, we
can remove the specific cleanup of RFLAGS.RF.

Signed-off-by: default avatarNadav Amit <namit@cs.technion.ac.il>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 4467c3f1

arch/x86/kvm/emulate.c

+4 −4
Original line number Diff line number Diff line
@@ -2211,7 +2211,7 @@ static int em_syscall(struct x86_emulate_ctxt *ctxt) 
	*reg_write(ctxt, VCPU_REGS_RCX) = ctxt->_eip;

	if (efer & EFER_LMA) {

#ifdef CONFIG_X86_64

		*reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags & ~EFLG_RF;

		*reg_write(ctxt, VCPU_REGS_R11) = ctxt->eflags;



		ops->get_msr(ctxt,

			     ctxt->mode == X86EMUL_MODE_PROT64 ?
@@ -2219,14 +2219,14 @@ static int em_syscall(struct x86_emulate_ctxt *ctxt) 
		ctxt->_eip = msr_data;



		ops->get_msr(ctxt, MSR_SYSCALL_MASK, &msr_data);

		ctxt->eflags &= ~(msr_data | EFLG_RF);

		ctxt->eflags &= ~msr_data;

#endif

	} else {

		/* legacy mode */

		ops->get_msr(ctxt, MSR_STAR, &msr_data);

		ctxt->_eip = (u32)msr_data;



		ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);

		ctxt->eflags &= ~(EFLG_VM | EFLG_IF);

	}



	return X86EMUL_CONTINUE;
@@ -2275,7 +2275,7 @@ static int em_sysenter(struct x86_emulate_ctxt *ctxt) 
		break;

	}



	ctxt->eflags &= ~(EFLG_VM | EFLG_IF | EFLG_RF);

	ctxt->eflags &= ~(EFLG_VM | EFLG_IF);

	cs_sel = (u16)msr_data;

	cs_sel &= ~SELECTOR_RPL_MASK;

	ss_sel = cs_sel + 8;