2
0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-18 02:04:05 +08:00
linux-next/virt
Marc Zyngier 1f03b2bcd0 KVM: Disable preemption in kvm_get_running_vcpu()
Accessing a per-cpu variable only makes sense when preemption is
disabled (and the kernel does check this when the right debug options
are switched on).

For kvm_get_running_vcpu(), it is fine to return the value after
re-enabling preemption, as the preempt notifiers will make sure that
this is kept consistent across task migration (the comment above the
function hints at it, but lacks the crucial preemption management).

While we're at it, move the comment from the ARM code, which explains
why the whole thing works.

Fixes: 7495e22bb1 ("KVM: Move running VCPU from ARM to common code").
Cc: Paolo Bonzini <pbonzini@redhat.com>
Reported-by: Zenghui Yu <yuzenghui@huawei.com>
Tested-by: Zenghui Yu <yuzenghui@huawei.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/318984f6-bc36-33a3-abc6-bf2295974b06@huawei.com
Message-id: <20200207163410.31276-1-maz@kernel.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-02-12 12:19:35 +01:00
..
kvm KVM: Disable preemption in kvm_get_running_vcpu() 2020-02-12 12:19:35 +01:00
lib KVM: lib: use jump label to handle resource release in irq_bypass_register_producer() 2020-01-08 18:16:01 +01:00
Makefile treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00