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Oliver Upton f003277311 KVM: arm64: Use config_lock to protect vgic state

Almost all of the vgic state is VM-scoped but accessed from the context
of a vCPU. These accesses were serialized on the kvm->lock which cannot
be nested within a vcpu->mutex critical section.

Move over the vgic state to using the config_lock. Tweak the lock
ordering where necessary to ensure that the config_lock is acquired
after the vcpu->mutex. Acquire the config_lock in kvm_vgic_create() to
avoid a race between the converted flows and GIC creation. Where
necessary, continue to acquire kvm->lock to avoid a race with vCPU
creation (i.e. flows that use lock_all_vcpus()).

Finally, promote the locking expectations in comments to lockdep
assertions and update the locking documentation for the config_lock as
well as vcpu->mutex.

Cc: stable@vger.kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230327164747.2466958-5-oliver.upton@linux.dev

2023-03-29 14:08:31 +01:00

trace.h

…

vgic-debug.c

KVM: arm64: Use config_lock to protect vgic state

2023-03-29 14:08:31 +01:00

vgic-init.c

KVM: arm64: Use config_lock to protect vgic state

2023-03-29 14:08:31 +01:00

vgic-irqfd.c

KVM: arm64: vgic: Add memcg accounting to vgic allocations

2021-10-17 11:25:55 +01:00