This is a small series that reworks a problem in a previously submitted patch [1]. The previous patch version did not consider that userspace accesses already hold the KVM mutex and therefore end up in deadlock. These patches therefore introduces uaccess read/write functions for the GICv2 MMIO register descriptor framework, splits out the distributor active register write functionality into separate guest and userspace access functions, and then finally take the KVM mutex on the guest access path and gets rid of unneeded complexity from active_change_prepare/finish. Applied on top of v4.12-rc1. [1]: https://lists.cs.columbia.edu/pipermail/kvmarm/2017-May/025542.html Changes from v1: - Separate guest and uaccess distributor active register writes. - Only take the mutex in the guest access path. Christoffer Dall (3): KVM: arm/arm64: Allow GICv2 to supply a uaccess register function KVM: arm/arm64: Separate guest and uaccess writes to dist {sc}active KVM: arm/arm64: Simplify active_change_prepare and plug race arch/arm/include/asm/kvm_host.h | 2 -- arch/arm64/include/asm/kvm_host.h | 2 -- virt/kvm/arm/arm.c | 20 +++--------- virt/kvm/arm/vgic/vgic-mmio-v2.c | 24 +++++++------- virt/kvm/arm/vgic/vgic-mmio-v3.c | 8 +++-- virt/kvm/arm/vgic/vgic-mmio.c | 68 ++++++++++++++++++++++++++++++--------- virt/kvm/arm/vgic/vgic-mmio.h | 12 ++++++- virt/kvm/arm/vgic/vgic.c | 11 ++++--- 8 files changed, 92 insertions(+), 55 deletions(-) -- 2.9.0
