Re: [PATCH v10 0/8] KVM: PPC: Driver to manage pages of secure guest

Paul Mackerras
2019-11-06T04:30:58Z

On Mon, Nov 04, 2019 at 09:47:52AM +0530, Bharata B Rao wrote:
> Hi,
>
> This is the next version of the patchset that adds required support
> in the KVM hypervisor to run secure guests on PEF-enabled POWER platforms.
>
> The major change in this version is about not using kvm.arch->rmap[]
> array to store device PFNs, thus not depending on the memslot availability
> to reach to the device PFN from the fault path. Instead of rmap[], we
> now have a different array which gets created and destroyed along with
> memslot creation and deletion. These arrays hang off from kvm.arch and
> are arragned in a simple linked list for now. We could move to some other
> data structure in future if walking of linked list becomes an overhead
> due to large number of memslots.

Thanks. This is looking really close now.

> Other changes include:
>
> - Rearranged/Merged/Cleaned up patches, removed all Acks/Reviewed-by since
> all the patches have changed.
> - Added a new patch to support H_SVM_INIT_ABORT hcall (From Suka)
> - Added KSM unmerge support so that VMAs that have device PFNs don't
> participate in KSM merging and eventually crash in KSM code.
> - Release device pages during unplug (Paul) and ensure that memory
> hotplug and unplug works correctly.
> - Let kvm-hv module to load on PEF-disabled platforms (Ram) when
> CONFIG_PPC_UV is enabled allowing regular non-secure guests
> to still run.
> - Support guest reset when swithing to secure is in progress.
> - Check if page is already secure in kvmppc_send_page_to_uv() before
> sending it to UV.
> - Fixed sentinal for header file kvm_book3s_uvmem.h (Jason)
>
> Now, all the dependencies required by this patchset are in powerpc/next
> on which this patchset is based upon.

Can you tell me what patches that are in powerpc/next but not upstream
this depends on?

Paul.