[PATCH v8 0/6] Support writable CPU ID registers from userspace

[Cornelia Huck]

On Tue, May 16 2023, Shameerali Kolothum Thodi <shameerali.kolothum.thodi at huawei.com> wrote:

>> -----Original Message-----
>> From: Marc Zyngier [mailto:maz at kernel.org]
>> Sent: 16 May 2023 12:01
>> To: Shameerali Kolothum Thodi <shameerali.kolothum.thodi at huawei.com>
>> Cc: Jing Zhang <jingzhangos at google.com>; KVM <kvm at vger.kernel.org>;
>> KVMARM <kvmarm at lists.linux.dev>; ARMLinux
>> <linux-arm-kernel at lists.infradead.org>; Oliver Upton <oupton at google.com>;
>> Will Deacon <will at kernel.org>; Paolo Bonzini <pbonzini at redhat.com>;
>> James Morse <james.morse at arm.com>; Alexandru Elisei
>> <alexandru.elisei at arm.com>; Suzuki K Poulose <suzuki.poulose at arm.com>;
>> Fuad Tabba <tabba at google.com>; Reiji Watanabe <reijiw at google.com>;
>> Raghavendra Rao Ananta <rananta at google.com>
>> Subject: Re: [PATCH v8 0/6] Support writable CPU ID registers from
>> userspace
>> 
>> On Tue, 16 May 2023 11:37:20 +0100,
>> Shameerali Kolothum Thodi <shameerali.kolothum.thodi at huawei.com>
>> wrote:
>> >
>> > > -----Original Message-----
>> > > From: Jing Zhang [mailto:jingzhangos at google.com]
>> > > Sent: 03 May 2023 18:16
>> > > To: KVM <kvm at vger.kernel.org>; KVMARM <kvmarm at lists.linux.dev>;
>> > > ARMLinux <linux-arm-kernel at lists.infradead.org>; Marc Zyngier
>> > > <maz at kernel.org>; Oliver Upton <oupton at google.com>
>> > > Cc: Will Deacon <will at kernel.org>; Paolo Bonzini
>> <pbonzini at redhat.com>;
>> > > James Morse <james.morse at arm.com>; Alexandru Elisei
>> > > <alexandru.elisei at arm.com>; Suzuki K Poulose
>> <suzuki.poulose at arm.com>;
>> > > Fuad Tabba <tabba at google.com>; Reiji Watanabe <reijiw at google.com>;
>> > > Raghavendra Rao Ananta <rananta at google.com>; Jing Zhang
>> > > <jingzhangos at google.com>
>> > > Subject: [PATCH v8 0/6] Support writable CPU ID registers from
>> userspace
>> > >
>> > > This patchset refactors/adds code to support writable per guest CPU ID
>> > > feature
>> > > registers. Part of the code/ideas are from
>> > >
>> https://lore.kernel.org/all/20220419065544.3616948-1-reijiw@google.com
>> >
>> > Hi Jing/Reiji,
>> >
>> > Just to check the status on the above mentioned series "KVM: arm64: Make
>> CPU
>> > ID registers writable by userspace". Is there any plan to respin that one
>> soon?
>> > (Sorry, not sure there is any other series in progress for that support
>> currently)
>> 
>> I think this still is the latest, which I'm about to review again. I'd
>> appreciate if you could have a look to!
>
> Thanks Marc for confirming. Will go through. We do have some requirement to
> add support for Qemu CPU models/migration between different hosts.

Do you have more concrete ideas for QEMU CPU models already? Asking
because I wanted to talk about this at KVM Forum, so collecting what
others would like to do seems like a good idea :)