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KVM: x86: Refactor kvm_vcpu_do_singlestep() to remove out param 

Return the single-step emulation result directly instead of via an out
param.  Presumably at some point in the past kvm_vcpu_do_singlestep()
could be called with *r==EMULATE_USER_EXIT, but that is no longer the
case, i.e. all callers are happy to overwrite their own return variable.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-08-27 14:40:29 -07:00 committed by Paolo Bonzini
parent 22da61c912
commit 120c2c4f99
1 changed files with 6 additions and 6 deletions
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12
arch/x86/kvm/x86.c
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@ -6474,7 +6474,7 @@ static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7,
return dr6;
}
static void kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu, int *r)
static int kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu)
{
struct kvm_run *kvm_run = vcpu->run;
@ -6483,10 +6483,10 @@ static void kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu, int *r)
kvm_run->debug.arch.pc = vcpu->arch.singlestep_rip;
kvm_run->debug.arch.exception = DB_VECTOR;
kvm_run->exit_reason = KVM_EXIT_DEBUG;
*r = EMULATE_USER_EXIT;
} else {
kvm_queue_exception_p(vcpu, DB_VECTOR, DR6_BS);
return EMULATE_USER_EXIT;
}
kvm_queue_exception_p(vcpu, DB_VECTOR, DR6_BS);
return EMULATE_DONE;
}
int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu)
@ -6507,7 +6507,7 @@ int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu)
* that sets the TF flag".
*/
if (unlikely(rflags & X86_EFLAGS_TF))
kvm_vcpu_do_singlestep(vcpu, &r);
r = kvm_vcpu_do_singlestep(vcpu);
return r == EMULATE_DONE;
}
EXPORT_SYMBOL_GPL(kvm_skip_emulated_instruction);
@ -6720,7 +6720,7 @@ restart:
exception_type(ctxt->exception.vector) == EXCPT_TRAP) {
kvm_rip_write(vcpu, ctxt->eip);
if (r == EMULATE_DONE && ctxt->tf)
kvm_vcpu_do_singlestep(vcpu, &r);
r = kvm_vcpu_do_singlestep(vcpu);
__kvm_set_rflags(vcpu, ctxt->eflags);
}