linux-kernel - Re: [PATCH 2/3] KVM: x86: always expose VIRT

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: <20190822184440.GA9964@char.us.oracle.com>
Date:   Thu, 22 Aug 2019 14:44:40 -0400
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        jmattson@...hat.com, ehabkost@...hat.com
Subject: Re: [PATCH 2/3] KVM: x86: always expose VIRT_SSBD to guests

On Wed, Aug 21, 2019 at 10:26:41AM +0200, Paolo Bonzini wrote:
> Even though it is preferrable to use SPEC_CTRL (represented by
> X86_FEATURE_AMD_SSBD) instead of VIRT_SPEC, VIRT_SPEC is always
> supported anyway because otherwise it would be impossible to
> migrate from old to new CPUs.  Make this apparent in the
> result of KVM_GET_SUPPORTED_CPUID as well.
> 
> While at it, reuse X86_FEATURE_* constants for the SVM leaf too.
> 
> However, we need to hide the bit on Intel processors, so move
> the setting to svm_set_supported_cpuid.
> 
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>

Thank you!