Re: [PATCH stable-5.8.y backport 1/2] KVM: Pass MMU notifier range flags to kvm_unmap_hva_range()

On Mon, Aug 24, 2020 at 12:30:47PM +0100, Will Deacon wrote:

commit fdfe7cbd58806522e799e2a50a15aee7f2cbb7b6 upstream.

The 'flags' field of 'struct mmu_notifier_range' is used to indicate whether invalidate_range_{start,end}() are permitted to block. In the case of kvm_mmu_notifier_invalidate_range_start(), this field is not forwarded on to the architecture-specific implementation of kvm_unmap_hva_range() and therefore the backend cannot sensibly decide whether or not to block.

Add an extra 'flags' parameter to kvm_unmap_hva_range() so that architectures are aware as to whether or not they are permitted to block.

Cc: stable@vger.kernel.org # v5.8 only

This matched the 5.8 patch I had already, but I took it just to be safe, thanks :)

greg k-h