linux-kernel - Re: [PATCH] KVM: x86/mmu: Add capability to zap only sptes for the affected memslot

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Message-ID: <20200723155711.GD21891@linux.intel.com>
Date:   Thu, 23 Jul 2020 08:57:11 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Xiong Zhang <xiong.y.zhang@...el.com>,
        Wayne Boyer <wayne.boyer@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Weijiang Yang <weijiang.yang@...el.com>
Subject: Re: [PATCH] KVM: x86/mmu: Add capability to zap only sptes for the
 affected memslot

On Tue, Jul 21, 2020 at 10:00:36AM -0600, Alex Williamson wrote:
> On Mon, 20 Jul 2020 20:03:19 -0700
> Sean Christopherson <sean.j.christopherson@...el.com> wrote:
> 
> > +Weijiang
> > 
> > On Mon, Jul 13, 2020 at 12:06:50PM -0700, Sean Christopherson wrote:
> > > The only ideas I have going forward are to:
> > > 
> > >   a) Reproduce the bug outside of your environment and find a resource that
> > >      can go through the painful bisection.  
> > 
> > We're trying to reproduce the original issue in the hopes of biesecting, but
> > have not yet discovered the secret sauce.  A few questions:
> > 
> >   - Are there any known hardware requirements, e.g. specific flavor of GPU?
> 
> I'm using an old GeForce GT635, I don't think there's anything special
> about this card.

Would you be able to provide your QEMU command line?  Or at least any
potentially relevant bits?  Still no luck reproducing this on our end.

Thanks again!