From: "Edgar E. Iglesias" <edgar.igles...@amd.com> Julien reported that he has seen strange behaviour when running Xen on QEMU using GICv2. When Xen migrates a guest's vCPU to another pCPU while the vCPU is handling an interrupt the guest is unable to properly deactivate interrupts.
It sounds like something rare but in some setups it actually happens all the time. Looking at it a little closer, our GICv2 model treats deactivation of SPI lines as if they were PPI's, i.e banked per CPU core. The state for active interrupts should only be banked for PPI lines, not for SPI lines. When deactivating SPI lines, I think we need to handle the state as unbanked, similar to how we handle writes to GICD_ICACTIVER. This fixes the problem on my side. Cheers, Edgar Edgar E. Iglesias (1): hw/intc/arm_gic: Fix deactivation of SPI lines hw/intc/gic_internal.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) base-commit: d16cab541ab9217977e2a39abf3d79f914146741 -- 2.40.1
