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From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: qemu-devel@nongnu.org, "Aurelien Jarno" <aurelien@aurel32.net>,
	"Peter Maydell" <peter.maydell@linaro.org>,
	"Anthony Perard" <anthony.perard@citrix.com>,
	qemu-ppc@nongnu.org, qemu-s390x@nongnu.org,
	"Halil Pasic" <pasic@linux.ibm.com>,
	"Huacai Chen" <chenhuacai@kernel.org>,
	xen-devel@lists.xenproject.org,
	"Marcel Apfelbaum" <marcel.apfelbaum@gmail.com>,
	qemu-arm@nongnu.org,
	"Stefano Stabellini" <sstabellini@kernel.org>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	kvm@vger.kernel.org, "BALATON Zoltan" <balaton@eik.bme.hu>,
	"Leif Lindholm" <leif@nuviainc.com>,
	"Richard Henderson" <richard.henderson@linaro.org>,
	"Radoslaw Biernacki" <rad@semihalf.com>,
	"Alistair Francis" <alistair@alistair23.me>,
	"Paul Durrant" <paul@xen.org>,
	"Eduardo Habkost" <ehabkost@redhat.com>,
	"Michael S. Tsirkin" <mst@redhat.com>,
	"Thomas Huth" <thuth@redhat.com>,
	"Jiaxun Yang" <jiaxun.yang@flygoat.com>,
	"Hervé Poussineau" <hpoussin@reactos.org>,
	"Greg Kurz" <groug@kaod.org>,
	"Christian Borntraeger" <borntraeger@de.ibm.com>,
	"Cornelia Huck" <cohuck@redhat.com>,
	"Edgar E. Iglesias" <edgar.iglesias@gmail.com>,
	"David Hildenbrand" <david@redhat.com>,
	"Mark Cave-Ayland" <mark.cave-ayland@ilande.co.uk>,
	"Aleksandar Rikalo" <aleksandar.rikalo@syrmia.com>,
	"Philippe Mathieu-Daudé" <f4bug@amsat.org>
Subject: Re: [RFC PATCH v2 06/11] hw/ppc: Restrict KVM to various PPC machines
Date: Mon, 22 Feb 2021 14:19:13 +0100	[thread overview]
Message-ID: <e28dc7fe-3a78-6b24-0034-830909f71f8e@redhat.com> (raw)
In-Reply-To: <YDNIQiHG0nfKXNR8@yekko.fritz.box>

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.



  reply	other threads:[~2021-02-22 13:19 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-19 17:38 [PATCH v2 00/11] hw/accel: Exit gracefully when accelerator is invalid Philippe Mathieu-Daudé
2021-02-19 17:38 ` [PATCH v2 01/11] accel/kvm: Check MachineClass kvm_type() return value Philippe Mathieu-Daudé
2021-02-22 17:24   ` Cornelia Huck
2021-02-22 17:41     ` Philippe Mathieu-Daudé
2021-02-22 17:50       ` Cornelia Huck
2021-02-22 18:04         ` Philippe Mathieu-Daudé
2021-02-22 23:33         ` David Gibson
2021-02-22 23:37           ` David Gibson
2021-02-23 10:36             ` Cornelia Huck
2021-02-23 11:23               ` Philippe Mathieu-Daudé
2021-02-19 17:38 ` [PATCH v2 02/11] hw/boards: Introduce machine_class_valid_for_accelerator() Philippe Mathieu-Daudé
2021-02-22 17:34   ` Cornelia Huck
2021-02-22 17:46     ` Philippe Mathieu-Daudé
2021-02-22 17:59       ` Cornelia Huck
2021-02-19 17:38 ` [PATCH v2 03/11] hw/core: Restrict 'query-machines' to those supported by current accel Philippe Mathieu-Daudé
2021-02-22 17:42   ` Cornelia Huck
2021-02-19 17:38 ` [PATCH v2 04/11] hw/arm: Restrit KVM to the virt & versal machines Philippe Mathieu-Daudé
2021-02-22 20:03   ` BALATON Zoltan
2021-02-19 17:38 ` [PATCH v2 05/11] hw/mips: Restrict KVM to the malta & virt machines Philippe Mathieu-Daudé
     [not found]   ` <31a32613-2a61-7cd2-582a-4e6d10949436@flygoat.com>
2021-02-20  6:02     ` Huacai Chen
2021-02-19 17:38 ` [RFC PATCH v2 06/11] hw/ppc: Restrict KVM to various PPC machines Philippe Mathieu-Daudé
2021-02-22  5:59   ` David Gibson
2021-02-22 13:19     ` Philippe Mathieu-Daudé [this message]
2021-02-19 17:38 ` [PATCH v2 07/11] hw/s390x: Explicit the s390-ccw-virtio machines support TCG and KVM Philippe Mathieu-Daudé
2021-02-22 17:37   ` Cornelia Huck
2021-02-19 17:38 ` [RFC PATCH v2 08/11] hw/i386: Explicit x86 machines support all current accelerators Philippe Mathieu-Daudé
2021-02-19 17:38 ` [PATCH v2 09/11] hw/xenpv: Restrict Xen Para-virtualized machine to Xen accelerator Philippe Mathieu-Daudé
2021-02-19 18:20   ` Paul Durrant
2021-02-19 17:38 ` [PATCH v2 10/11] hw/board: Only allow TCG accelerator by default Philippe Mathieu-Daudé
2021-02-19 17:38 ` [PATCH v2 11/11] softmmu/vl: Exit gracefully when accelerator is not supported Philippe Mathieu-Daudé
2021-02-22 17:46   ` Cornelia Huck

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