linux-kernel - Re: [PATCH 6/6] KVM: PPC: Book3S HV: Add one-reg interface for HASHKEYR register

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Date: Tue, 04 Jun 2024 16:07:29 +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 6/6] KVM: PPC: Book3S HV: Add one-reg interface for
 HASHKEYR register

On Mon Jun 3, 2024 at 9:15 PM AEST, Shivaprasad G Bhat wrote:
> The patch adds a one-reg register identifier which can be used to
> read and set the virtual HASHKEYR for the guest during enter/exit
> with KVM_REG_PPC_HASHKEYR. The specific SPR KVM API documentation
> too updated.
>
> Signed-off-by: Shivaprasad G Bhat <sbhat@...ux.ibm.com>
> ---
>  Documentation/virt/kvm/api.rst            |    1 +
>  arch/powerpc/include/uapi/asm/kvm.h       |    1 +
>  arch/powerpc/kvm/book3s_hv.c              |    6 ++++++
>  tools/arch/powerpc/include/uapi/asm/kvm.h |    1 +
>  4 files changed, 9 insertions(+)
>
> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
> index 81077c654281..0c22cb4196d8 100644
> --- a/Documentation/virt/kvm/api.rst
> +++ b/Documentation/virt/kvm/api.rst
> @@ -2439,6 +2439,7 @@ registers, find a list below:
>    PPC     KVM_REG_PPC_PSSCR               64
>    PPC     KVM_REG_PPC_DEC_EXPIRY          64
>    PPC     KVM_REG_PPC_PTCR                64
> +  PPC     KVM_REG_PPC_HASHKEYR            64

Just looking at the QEMU side of this change made me think... AFAIKS
we need to also set and get and migrate the HASHPKEY SPR.

The hashst/hashchk test cases might be "working" by chance if the SPR
is always zero :/

Thanks,
Nick