diff mbox series

[v2,17/43] KVM: x86: Directly block (instead of "halting") UNINITIALIZED vCPUs

Message ID 20211009021236.4122790-18-seanjc@google.com (mailing list archive)
State New, archived
Headers show
Series KVM: Halt-polling and x86 APICv overhaul | expand

Commit Message

Sean Christopherson Oct. 9, 2021, 2:12 a.m. UTC 
Go directly to kvm_vcpu_block() when handling the case where userspace
attempts to run an UNINITIALIZED vCPU.  The vCPU is not halted, nor is it
likely that halt-polling will be successful in this case.

Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 arch/x86/kvm/x86.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Maxim Levitsky Oct. 27, 2021, 2:46 p.m. UTC | #1 
On Fri, 2021-10-08 at 19:12 -0700, Sean Christopherson wrote:
> Go directly to kvm_vcpu_block() when handling the case where userspace
> attempts to run an UNINITIALIZED vCPU.  The vCPU is not halted, nor is it
> likely that halt-polling will be successful in this case.
> 
> Reviewed-by: David Matlack <dmatlack@google.com>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  arch/x86/kvm/x86.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index e6c17bbed25c..cd51f100e906 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -10133,7 +10133,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
>  			r = -EINTR;
>  			goto out;
>  		}
> -		kvm_vcpu_halt(vcpu);
> +		kvm_vcpu_block(vcpu);
>  		if (kvm_apic_accept_events(vcpu) < 0) {
>  			r = 0;
>  			goto out;


Makes sense.
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>


Best regards,
	Maxim levitsky
diff mbox series

Patch

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e6c17bbed25c..cd51f100e906 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -10133,7 +10133,7 @@  int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
 			r = -EINTR;
 			goto out;
 		}
-		kvm_vcpu_halt(vcpu);
+		kvm_vcpu_block(vcpu);
 		if (kvm_apic_accept_events(vcpu) < 0) {
 			r = 0;
 			goto out;