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Re: [PATCH v2 3/3] xen/arm: Warn user on cpu errata 832075
- To: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- From: George Dunlap <George.Dunlap@xxxxxxxxxx>
- Date: Wed, 28 Oct 2020 09:43:21 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, "open list:X86" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, "Julien Grall" <julien@xxxxxxx>, Wei Liu <wl@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v2 3/3] xen/arm: Warn user on cpu errata 832075
> On Oct 28, 2020, at 8:43 AM, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
> wrote:
>
>
>
>> On 27 Oct 2020, at 22:44, Stefano Stabellini <sstabellini@xxxxxxxxxx> wrote:
>>
>> On Mon, 26 Oct 2020, Bertrand Marquis wrote:
>>> When a Cortex A57 processor is affected by CPU errata 832075, a guest
>>> not implementing the workaround for it could deadlock the system.
>>> Add a warning during boot informing the user that only trusted guests
>>> should be executed on the system.
>>> An equivalent warning is already given to the user by KVM on cores
>>> affected by this errata.
>>>
>>> Also taint the hypervisor as unsecure when this errata applies and
>>> mention Cortex A57 r0p0 - r1p2 as not security supported in SUPPORT.md
>>>
>>> Signed-off-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
>>> ---
>>> SUPPORT.md | 1 +
>>> xen/arch/arm/cpuerrata.c | 13 +++++++++++++
>>> 2 files changed, 14 insertions(+)
>>>
>>> diff --git a/SUPPORT.md b/SUPPORT.md
>>> index 5fbe5fc444..f7a3b046b0 100644
>>> --- a/SUPPORT.md
>>> +++ b/SUPPORT.md
>>> @@ -38,6 +38,7 @@ supported in this document.
>>> ### ARM v8
>>>
>>> Status: Supported
>>> + Status, Cortex A57 r0p0 - r1p2, not security supported (Errata 832075)
I think this should be:
8<—
Status, Cortex A57 r0p0-r1p1: Supported, not security supported
For the Cortex A57 r0p0 - r1p1, see Errata 832075.
—>8
-George
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