linux-kernel - Re: [PATCH v2] KVM: x86: Do not return host topology information from KVM_GET_SUPPORTED

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Message-ID: <Y9N72sE4eEOYDKzG@kroah.com>
Date:   Fri, 27 Jan 2023 08:23:06 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jim Mattson <jmattson@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, seanjc@...gle.com, stable@...r.kernel.org
Subject: Re: [PATCH v2] KVM: x86: Do not return host topology information
 from KVM_GET_SUPPORTED_CPUID

On Thu, Jan 26, 2023 at 12:45:58PM -0800, Jim Mattson wrote:
> On Thu, Jan 26, 2023 at 9:47 AM Paolo Bonzini <pbonzini@...hat.com> wrote:
> >
> > On 1/26/23 17:06, Jim Mattson wrote:
> > >>> Sadly, there isn't a single kernel involved. People running our VMM on
> > >>> their desktops are going to be impacted as soon as this patch hits
> > >>> that distro. (I don't know if I can say which distro that is.) So, now
> > >>> we have to get the VMM folks to urgently accommodate this change and
> > >>> get a new distribution out.
> > >>
> > >> Ok, this is what is needed to make a more informed choice.  To be clear,
> > >> this is _still_ not public (for example it's not ChromeOS), so there is
> > >> at least some control on what version of the VMM they use?  Would it
> > >> make sense to buy you a few months by deferring this patch to Linux 6.3-6.5?
> > >
> > > Mainline isn't a problem. I'm more worried about 5.19 LTS.
> >
> > 5.19 is not LTS, is it?  This patch is only in 6.1.7 and 6.1.8 as far as
> > stable kernels is concerned, should I ask Greg to revert it there?
> 
> It came to my attention when commit 196c6f0c3e21 ("KVM: x86: Do not
> return host topology information from KVM_GET_SUPPORTED_CPUID") broke
> some of our tests under 5.10 LTS.
> 
> If it isn't bound for linux-5.19-y, then we have some breathing room.

5.19 is long end-of-life, it dropped off of being maintained back in
October of last year.

You can always use the front page of kernel.org to determine what is
still being maintained.

thanks,

greg k-h