KVM: arm/arm64: Fix guest's PMR synchronization when blocking on WFI
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b4 am [email protected]Versions newest first
- v1 Latest2 patches 2 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | KVM: arm/arm64: Sync ICH_VMCR_EL2 back when about to blockinclude/ virt/ virt/ +3 more | +39 | 0 replies | |
| 2/2 | KVM: Call kvm_arch_vcpu_blocking early into the blocking sequencevirt/ | +3 | 2 replies |
Reviews trailers per patch
1 of 2 patches has a Reviewed-by or Acked-by.
| Patch | Paolo Bonzini |
|---|---|
| 1/2 | |
| 2/2 | A-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH 0/2] KVM: arm/arm64: Fix guest's PMR synchronization when blocking on WFI
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(-)
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2.20.1