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Re: [PATCH v5 03/11] target/arm: Restrict ARMv4 cpus to TCG accel
From: |
Peter Maydell |
Subject: |
Re: [PATCH v5 03/11] target/arm: Restrict ARMv4 cpus to TCG accel |
Date: |
Sat, 30 Jan 2021 18:54:37 +0000 |
On Sat, 30 Jan 2021 at 18:36, Philippe Mathieu-Daudé <f4bug@amsat.org> wrote:
>
> Hi Peter,
>
> On 1/30/21 4:37 PM, Peter Maydell wrote:
> > On Sat, 30 Jan 2021 at 01:52, Philippe Mathieu-Daudé <f4bug@amsat.org>
> > wrote:
> >>
> >> KVM requires a cpu based on (at least) the ARMv7 architecture.
> >
> > These days it requires ARMv8, because we dropped 32-bit host
> > support, and all 64-bit host CPUs are v8.
>
> Oh, this comment is about the target, to justify it is pointless to
> include pre-v7 target cpus/machines in a KVM-only binary.
>
> I'll update as:
>
> "KVM requires the target cpu based on (at least) the ARMv7
> architecture."
KVM requires the target CPU to be at least ARMv8, because
we only support the "host" cpu type, and all KVM host CPUs
are v8, which means you can't pass a v7 CPU as the target CPU.
(This used to not be true when we still supported running
KVM on a v7 CPU like the Cortex-A15, in which case you could
pass it to the guest.)
thanks
-- PMM
[PATCH v5 04/11] target/arm: Restrict ARMv5 cpus to TCG accel, Philippe Mathieu-Daudé, 2021/01/29
[PATCH v5 05/11] target/arm: Restrict ARMv6 cpus to TCG accel, Philippe Mathieu-Daudé, 2021/01/29
[PATCH v5 06/11] target/arm: Restrict ARMv7 R-profile cpus to TCG accel, Philippe Mathieu-Daudé, 2021/01/29
[PATCH v5 07/11] target/arm: Restrict ARMv7 M-profile cpus to TCG accel, Philippe Mathieu-Daudé, 2021/01/29
[PATCH v5 08/11] target/arm: Make m_helper.c optional via CONFIG_ARM_V7M, Philippe Mathieu-Daudé, 2021/01/29
[PATCH v5 09/11] target/arm: Reorder meson.build rules, Philippe Mathieu-Daudé, 2021/01/29
[PATCH v5 11/11] .travis.yml: Add a KVM-only Aarch64 job, Philippe Mathieu-Daudé, 2021/01/29
[PATCH v5 10/11] target/arm: Do not build TCG objects when TCG is off, Philippe Mathieu-Daudé, 2021/01/29