[PATCH] KVM: arm64: Skip CMOs when updating a PTE pointing to non-memory

[Jean-Philippe Brucker]

On Tue, Apr 27, 2021 at 03:52:46PM +0100, Alexandru Elisei wrote:
> The comment [1] suggested that the panic is triggered during page aging.

I think only with an out-of-tree patch applied
https://jpbrucker.net/git/linux/commit/?h=sva/2021-03-01&id=d32d8baaf293aaefef8a1c9b8a4508ab2ec46c61
which probably is not going upstream.

Thanks,
Jean

> vfio_pci_mmap() sets the VM_PFNMAP for the VMA and I see in the Documentation that
> pages with VM_PFNMAP are added to the unevictable LRU list, doesn't that mean it's
> not subject the page aging? I feel like there's something I'm missing.
> 
> [1]
> https://lore.kernel.org/kvm/BY5PR12MB37642B9AC7E5D907F5A664F6B3459@BY5PR12MB3764.namprd12.prod.outlook.com/
> 
> Thanks,
> 
> Alex