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Date:   Thu, 28 Nov 2019 15:56:39 +1100
From:   Paul Mackerras <paulus@ozlabs.org>
To:     Paolo Bonzini <pbonzini@redhat.com>, kvm@vger.kernel.org
Cc:     kvm-ppc@vger.kernel.org, Bharata B Rao <bharata@linux.vnet.ibm.com>
Subject: Re: [GIT PULL] Please pull my kvm-ppc-uvmem-5.5 tag
Message-ID: <20191128045639.GA28618@oak.ozlabs.ibm.com>
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On Tue, Nov 26, 2019 at 04:24:55PM +1100, Paul Mackerras wrote:
> Paolo,
> 
> If you are intending to send a second pull request for Linus for this
> merge window, and you are OK with taking a new feature in PPC KVM code
> at this stage, then please do a pull from my kvm-ppc-uvmem-5.5 tag.
> This adds code to manage the movement of pages for a secure KVM guest
> between normal memory managed by the host kernel and secure memory
> managed by the ultravisor on Power systems with Protected Execution
> Facility hardware and firmware.  Secure memory is not accessible to
> the host kernel and is represented as device memory using the
> ZONE_DEVICE facility.
> 
> The patch set has been around for a while and has been reasonably well
> reviewed -- this branch contains v11 of the patch set.  The code
> changes are confined to PPC KVM code with the exception of a one-line
> change to mm/ksm.c to export the ksm_madvise function, the addition of
> a new ioctl number in include/uapi/linux/kvm.h, and the addition of a
> Kconfig option in arch/powerpc/Kconfig (which Michael Ellerman is OK
> with).

Please hold off on this.  Hugh Dickins sent some review comments
identifying a problem (ksm_madvise needs mmap_sem held for writing,
not just reading).  I'll send an updated pull request shortly.

Paul.