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Re: [PATCH v2 3/3] xen/arm: Warn user on cpu errata 832075
- To: George Dunlap <george.dunlap@xxxxxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Wed, 28 Oct 2020 09:56:45 +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>
- Delivery-date: Wed, 28 Oct 2020 09:57:34 +0000
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- Thread-topic: [PATCH v2 3/3] xen/arm: Warn user on cpu errata 832075
Hi George,
> On 28 Oct 2020, at 09:43, George Dunlap <george.dunlap@xxxxxxxxxx> wrote:
>
>
>
>> 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
>
Ok I will fix that.
Thanks for the review
Cheers
Bertrand
> -George
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