linux-kernel - Re: [PATCH 0/2] x86: KVM: Add missing AMD features

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4d58d221-5327-4090-926e-a9c21c334ed4@yandex-team.ru>
Date: Sat, 16 Nov 2024 15:02:47 +0300
From: Maksim Davydov <davydov-max@...dex-team.ru>
To: Borislav Petkov <bp@...en8.de>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, babu.moger@....com,
 x86@...nel.org, seanjc@...gle.com, sandipan.das@....com, mingo@...hat.com,
 tglx@...utronix.de, dave.hansen@...ux.intel.com, hpa@...or.com,
 pbonzini@...hat.com
Subject: Re: [PATCH 0/2] x86: KVM: Add missing AMD features


Hi!

On 11/16/24 14:47, Borislav Petkov wrote:
> On Wed, Nov 13, 2024 at 04:30:40PM +0300, Maksim Davydov wrote:
>> This series adds definition of some missing AMD features in
>> 0x80000008_EBX and 0x80000021_EAX functions. It also gives an opportunity
>> to expose these features to userspace.
> 
> Any particular, concrete use for them in luserspace or this is a just-for-fun
> exercise?
> 

Yes, BTC_NO and AMD_IBPB_RET are used by guests while choosing mitigations.

-- 
Best regards,
Maksim Davydov