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Re: [PATCH v2 5/6] x86/emulate: remove HAVE_AS_RDRAND and HAVE_AS_RDSEED
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 4 Apr 2025 09:11:40 +0200
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- Cc: anthony.perard@xxxxxxxxxx, julien@xxxxxxx, michal.orzel@xxxxxxx, roger.pau@xxxxxxxxxx, sstabellini@xxxxxxxxxx, dmukhin@xxxxxxxx, dmkhn@xxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 04 Apr 2025 07:11:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.04.2025 21:21, Andrew Cooper wrote:
> On 03/04/2025 7:23 pm, dmkhn@xxxxxxxxx wrote:
>> From: Denis Mukhin <dmukhin@xxxxxxxx>
>>
>> The new toolchain baseline knows the rdrand/rdseed instructions,
>> no need to carry the workaround in the code.
>>
>> Resolves: https://gitlab.com/xen-project/xen/-/work_items/208
>> Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
>> ---
>> xen/arch/x86/arch.mk | 2 --
>> xen/arch/x86/x86_emulate/0fc7.c | 15 +++++----------
>
> Huh...
>
> I was expecting a hunk in xen/arch/x86/include/asm/random.h but lookin
> at it, I see that didn't even get the HAVE_AS_RDRAND treatment in the
> first place. Also, the + constraint, rather than =, looks suspicious.
Might that have been for a similar reason as the one you recently added
a XOR ahead of POPCNT for? IOW us wanting the clearing of the output to
happen irrespective of whether the if() condition is true?
Jan
|
