Re: [PATCH V3 1/1] hw/intc/arm_gicv3_kvm: preserve pending interrupts during cpr

[Peter Maydell <peter.maydell@linaro.org>]

On Mon, 11 Aug 2025 at 19:19, Steve Sistare <steven.sistare@oracle.com> wrote:
>
> Close a race condition that causes cpr-transfer to lose VFIO
> interrupts on ARM.
>
> CPR stops VCPUs but does not disable VFIO interrupts, which may continue
> to arrive throughout the transition to new QEMU.
>
> CPR calls kvm_irqchip_remove_irqfd_notifier_gsi in old QEMU to force
> future interrupts to the producer eventfd, where they are preserved.
> Old QEMU then destroys the old KVM instance.  However, interrupts may
> already be pending in KVM state.  To preserve them, call ioctl
> KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES to flush them to guest RAM, where
> they will be picked up when the new KVM+VCPU instance is created.
>
> Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
> Reviewed-by: Fabiano Rosas <farosas@suse.de>
> ---


Applied to target-arm.next for 10.2, thanks. I added a cc:stable tag.

-- PMM