linux-kernel - Re: [RFC PATCH v2 20/69] KVM: x86/mmu: Mark VM as bugged if page fault returns RET_PF

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Date:   Tue, 13 Jul 2021 20:28:29 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     isaku.yamahata@...el.com
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>,
        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>, erdemaktas@...gle.com,
        Connor Kuehl <ckuehl@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        isaku.yamahata@...il.com,
        Sean Christopherson <sean.j.christopherson@...el.com>
Subject: Re: [RFC PATCH v2 20/69] KVM: x86/mmu: Mark VM as bugged if page
 fault returns RET_PF_INVALID

On Fri, Jul 02, 2021, isaku.yamahata@...el.com wrote:
> From: Sean Christopherson <sean.j.christopherson@...el.com>

For a changelog:

  Mark a VM as bugged instead of simply warning if the core page fault
  handler unexpectedly returns RET_PF_INVALID.  KVM's (undocumented) API
  for the page fault path does not allow returning RET_PF_INVALID, e.g. a
  fatal condition should be morphed to -errno.

> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> ---