averello/linux-stable-mirror
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2026-09-22 09:34:56 +02:00
Code Issues Packages Projects Releases Wiki Activity

KVM: arm64: Wake-up from WFI when iqrchip is in userspace

Browse Source 
commit 4ce98bf086 upstream

It appears that there is nothing in the wake-up path that
evaluates whether the in-kernel interrupts are pending unless
we have a vgic.

This means that the userspace irqchip support has been broken for
about four years, and nobody noticed. It was also broken before
as we wouldn't wake-up on a PMU interrupt, but hey, who cares...

It is probably time to remove the feature altogether, because it
was a terrible idea 10 years ago, and it still is.

Fixes: b57de4ffd7 ("KVM: arm64: Simplify kvm_cpu_has_pending_timer()")
Link: https://patch.msgid.link/20260423163607.486345-1-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Marc Zyngier
2026-05-17 17:13:54 +02:00
committed by Greg Kroah-Hartman
parent 83ce43a21b
commit 944d76f749
1 changed files with 5 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm64/kvm/arm.c
+5
View File
@@ -557,6 +557,11 @@ int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
bool irq_lines = *vcpu_hcr(v) & (HCR_VI | HCR_VF);
irq_lines |= (!irqchip_in_kernel(v->kvm) &&
(kvm_timer_should_notify_user(v) ||
kvm_pmu_should_notify_user(v)));
return ((irq_lines || kvm_vgic_vcpu_pending_irq(v))
&& !kvm_arm_vcpu_stopped(v) && !v->arch.pause);
}