linux-kernel - Re: [PATCH RFC 0/5] x86/KVM/svm: get rid of hardcoded instructions lengths

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Message-ID: <3515d812-e5dd-4436-b73f-1d64bc93b079@redhat.com>
Date:   Thu, 20 Jun 2019 14:14:06 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH RFC 0/5] x86/KVM/svm: get rid of hardcoded instructions
 lengths

On 20/06/19 13:02, Vitaly Kuznetsov wrote:
> 
> P.S. If you'd like to test the series you'll have to have a CPU without
> NRIP_SAVE feature or forcefully disable it, something like:
> 
> index 8d4e50428b68..93c7eaad7915 100644
> --- a/arch/x86/kernel/cpu/amd.c
> +++ b/arch/x86/kernel/cpu/amd.c
> @@ -922,6 +922,9 @@ static void init_amd(struct cpuinfo_x86 *c)
>         /* AMD CPUs don't reset SS attributes on SYSRET, Xen does. */
>         if (!cpu_has(c, X86_FEATURE_XENPV))
>                 set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
> +
> +       /* No nrips */
> +       clear_cpu_cap(c, X86_FEATURE_NRIPS);
>  }
>  
>  #ifdef CONFIG_X86_32

Let's add a module parameter instead.  Patch sent (forgot to Cc you).

Paolo