Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support

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To: Joerg Roedel <jroedel@xxxxxxx>
Subject: Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
From: Sean Christopherson <seanjc@xxxxxxxxxx>
Date: Tue, 16 Nov 2021 18:26:29 +0000
Cc: Andy Lutomirski <luto@xxxxxxxxxx>, Marc Orr <marcorr@xxxxxxxxxx>, "Dr. David Alan Gilbert" <dgilbert@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxx>, Peter Gonda <pgonda@xxxxxxxxxx>, Brijesh Singh <brijesh.singh@xxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, kvm list <kvm@xxxxxxxxxxxxxxx>, linux-coco@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Linux Crypto Mailing List <linux-crypto@xxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Tom Lendacky <Thomas.Lendacky@xxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Wanpeng Li <wanpengli@xxxxxxxxxxx>, Jim Mattson <jmattson@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Sergio Lopez <slp@xxxxxxxxxx>, "Peter Zijlstra (Intel)" <peterz@xxxxxxxxxxxxx>, Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Dov Murik <dovmurik@xxxxxxxxxxxxx>, Tobin Feldman-Fitzthum <tobin@xxxxxxx>, Michael Roth <Michael.Roth@xxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, "Kirill A . Shutemov" <kirill@xxxxxxxxxxxxx>, Andi Kleen <ak@xxxxxxxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>, Marc Zyngier <maz@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Quentin Perret <qperret@xxxxxxxxxx>
In-reply-to: <YZOwbjGVEfa/wLaS@suse.de>
References: <061ccd49-3b9f-d603-bafd-61a067c3f6fa@intel.com> <YY6z5/0uGJmlMuM6@zn.tnic> <YY7FAW5ti7YMeejj@google.com> <YZJTA1NyLCmVtGtY@work-vm> <YZKmSDQJgCcR06nE@google.com> <CAA03e5E3Rvx0t8_ZrbNMZwBkjPivGKOg5HCShSFYwfkKDDHWtA@mail.gmail.com> <YZKxuxZurFW6BVZJ@google.com> <CAA03e5GBajwRJBuTJLPjji7o8QD2daEUJU7DpPJBxtWsf-DE8g@mail.gmail.com> <8a244d34-2b10-4cf8-894a-1bf12b59cf92@www.fastmail.com> <YZOwbjGVEfa/wLaS@suse.de>

On Tue, Nov 16, 2021, Joerg Roedel wrote:
> But as Marc already pointed out, the kernel needs a plan B when an RMP
> happens anyway due to some bug.

I don't see why unexpected RMP #PF is a special snowflake that needs a different
plan than literally every other type of unexpected #PF in the kernel.

Follow-Ups:
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Peter Gonda

References:
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Dave Hansen
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Borislav Petkov
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Sean Christopherson
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Dr. David Alan Gilbert
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Sean Christopherson
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Marc Orr
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Sean Christopherson
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Marc Orr
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Andy Lutomirski
- Re: [PATCH Part2 v5 00/45] Add AMD Secure Nested Paging (SEV-SNP) Hypervisor Support
  - From: Joerg Roedel

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