It recently came to light that if we run a guest that actively uses interrupt priorities to block interrupts, vcpus can end-up being blocked while they shouldn't, leading to an unresponsive guest (a slightly less than desirable outcome). Patch #1 fixes the issue (which has been with us since 4.12), which I plan to take in for 5.3 with immediate backport to stable. Patch #2 is more of an RFC, as it also impacts the SVN AVIC support. It moves the kvm_arch_vcpu_blocking callback to happen earlier, leading to much better performances on ARM, and leading to the above fix to be applied at the best possible spot. I'd welcome any comment/testing on this, specially on non-ARM systems. Marc Zyngier (2): KVM: arm/arm64: Sync ICH_VMCR_EL2 back when about to block KVM: Call kvm_arch_vcpu_blocking early into the blocking sequence include/kvm/arm_vgic.h | 1 + virt/kvm/arm/arm.c | 11 +++++++++++ virt/kvm/arm/vgic/vgic-v2.c | 9 ++++++++- virt/kvm/arm/vgic/vgic-v3.c | 7 ++++++- virt/kvm/arm/vgic/vgic.c | 11 +++++++++++ virt/kvm/arm/vgic/vgic.h | 2 ++ virt/kvm/kvm_main.c | 7 +++---- 7 files changed, 42 insertions(+), 6 deletions(-) -- 2.20.1
