[RFC PATCH v4 01/39] KVM: arm64: Make lock_all_vcpus() available to the rest of KVM

[Suzuki K Poulose]

On 25/08/2021 17:17, Alexandru Elisei wrote:
> The VGIC code uses the lock_all_vcpus() function to make sure no VCPUs are
> run while it fiddles with the global VGIC state. Move the declaration of
> lock_all_vcpus() and the corresponding unlock function into asm/kvm_host.h
> where it can be reused by other parts of KVM/arm64 and rename the functions
> to kvm_{lock,unlock}_all_vcpus() to make them more generic.
> 
> Because the scope of the code potentially using the functions has
> increased, add a lockdep check that the kvm->lock is held by the caller.
> Holding the lock is necessary because otherwise userspace would be able to
> create new VCPUs and run them while the existing VCPUs are locked.
> 
> No functional change intended.
> 
> Signed-off-by: Alexandru Elisei <alexandru.elisei at arm.com>


LGTM,

Reviewed-by: Suzuki K Poulose <suzuki.poulose at arm.com>