linux-kernel - Re: [PATCH 0/6] KVM: PPC: Book3S HV: Nested guest migration fixes

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Date: Tue, 04 Jun 2024 15:48:16 +1000
From: "Nicholas Piggin" <npiggin@...il.com>
To: "Shivaprasad G Bhat" <sbhat@...ux.ibm.com>, <kvm@...r.kernel.org>,
 <linux-doc@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Cc: <pbonzini@...hat.com>, <naveen.n.rao@...ux.ibm.com>,
 <christophe.leroy@...roup.eu>, <corbet@....net>, <mpe@...erman.id.au>,
 <namhyung@...nel.org>, <pbonzini@...hat.com>, <jniethe5@...il.com>,
 <atrajeev@...ux.vnet.ibm.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/6] KVM: PPC: Book3S HV: Nested guest migration fixes

On Mon Jun 3, 2024 at 9:13 PM AEST, Shivaprasad G Bhat wrote:
> The series fixes the issues exposed by the kvm-unit-tests[1]
> sprs-migration test.
>
> The SDAR, MMCR3 were seen to have some typo/refactoring bugs.
> The first two patches fix them.
>
> Though the nestedv2 APIs defined the guest state elements for
> Power ISA 3.1B SPRs to save-restore with PHYP during entry-exit,
> the DEXCR and HASHKEYR were ignored in code. The KVM_PPC_REG too
> for them are missing without which the Qemu is not setting them
> to their 'previous' value during guest migration at destination.
> The remaining patches take care of this.

These aren't just fixes for nested v2 or even just migration,
by the way. Good fixes.

Thanks,
Nick

>
> References:
> [1]: https://github.com/kvm-unit-tests/kvm-unit-tests
>
> ---
>
> Shivaprasad G Bhat (6):
>       KVM: PPC: Book3S HV: Fix the set_one_reg for MMCR3
>       KVM: PPC: Book3S HV: Fix the get_one_reg of SDAR
>       KVM: PPC: Book3S HV nestedv2: Keep nested guest DEXCR in sync
>       KVM: PPC: Book3S HV: Add one-reg interface for DEXCR register
>       KVM: PPC: Book3S HV nestedv2: Keep nested guest HASHKEYR in sync
>       KVM: PPC: Book3S HV: Add one-reg interface for HASHKEYR register
>
>
>  Documentation/virt/kvm/api.rst            |  2 ++
>  arch/powerpc/include/asm/kvm_host.h       |  2 ++
>  arch/powerpc/include/uapi/asm/kvm.h       |  2 ++
>  arch/powerpc/kvm/book3s_hv.c              | 16 ++++++++++++++--
>  arch/powerpc/kvm/book3s_hv.h              |  2 ++
>  arch/powerpc/kvm/book3s_hv_nestedv2.c     | 12 ++++++++++++
>  tools/arch/powerpc/include/uapi/asm/kvm.h |  2 ++
>  7 files changed, 36 insertions(+), 2 deletions(-)
>
> --
> Signature