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Re: [RFC PATCH v2 06/11] hw/ppc: Restrict KVM to various PPC machines
- To: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
- From: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
- Date: Mon, 22 Feb 2021 14:19:13 +0100
- Authentication-results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@xxxxxxxxxx
- Cc: qemu-devel@xxxxxxxxxx, Aurelien Jarno <aurelien@xxxxxxxxxxx>, Peter Maydell <peter.maydell@xxxxxxxxxx>, Anthony Perard <anthony.perard@xxxxxxxxxx>, qemu-ppc@xxxxxxxxxx, qemu-s390x@xxxxxxxxxx, Halil Pasic <pasic@xxxxxxxxxxxxx>, Huacai Chen <chenhuacai@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Marcel Apfelbaum <marcel.apfelbaum@xxxxxxxxx>, qemu-arm@xxxxxxxxxx, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, BALATON Zoltan <balaton@xxxxxxxxxx>, Leif Lindholm <leif@xxxxxxxxxxxx>, Richard Henderson <richard.henderson@xxxxxxxxxx>, Radoslaw Biernacki <rad@xxxxxxxxxxxx>, Alistair Francis <alistair@xxxxxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>, Eduardo Habkost <ehabkost@xxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Thomas Huth <thuth@xxxxxxxxxx>, Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>, Hervé Poussineau <hpoussin@xxxxxxxxxxx>, Greg Kurz <groug@xxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxx>, Cornelia Huck <cohuck@xxxxxxxxxx>, "Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Mark Cave-Ayland <mark.cave-ayland@xxxxxxxxxxxx>, Aleksandar Rikalo <aleksandar.rikalo@xxxxxxxxxx>, Philippe Mathieu-Daudé <f4bug@xxxxxxxxx>
- Delivery-date: Mon, 22 Feb 2021 13:19:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2/22/21 6:59 AM, David Gibson wrote:
> On Fri, Feb 19, 2021 at 06:38:42PM +0100, Philippe Mathieu-Daudé wrote:
>> Restrit KVM to the following PPC machines:
>> - 40p
>> - bamboo
>> - g3beige
>> - mac99
>> - mpc8544ds
>> - ppce500
>> - pseries
>> - sam460ex
>> - virtex-ml507
>
> Hrm.
>
> The reason this list is kind of surprising is because there are 3
> different "flavours" of KVM on ppc: KVM HV ("pseries" only), KVM PR
> (almost any combination, theoretically, but kind of buggy in
> practice), and the Book E specific KVM (Book-E systems with HV
> extensions only).
>
> But basically, qemu explicitly managing what accelerators are
> available for each machine seems the wrong way around to me. The
> approach we've generally taken is that qemu requests the specific
> features it needs of KVM, and KVM tells us whether it can supply those
> or not (which may involve selecting between one of the several
> flavours).
>
> That way we can extend KVM to cover more situations without needing
> corresponding changes in qemu every time.
OK thanks for the information. I'll wait the other patches
get reviewed (in particular the most important ones, 2 and
10) before respining including this information.
Regards,
Phil.
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