From: Paolo Bonzini <pbonzini@redhat.com>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Peter Zijlstra <peterz@infradead.org>,
Andi Kleen <ak@linux.intel.com>, Joerg Roedel <jroedel@suse.de>,
David Rientjes <rientjes@google.com>,
Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
Sean Christopherson <seanjc@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Brijesh Singh <brijesh.singh@amd.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Jon Grimm <Jon.Grimm@amd.com>,
Thomas Gleixner <tglx@linutronix.de>,
Christoph Hellwig <hch@lst.de>, Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, linux-mm@kvack.org
Subject: Re: AMD SEV-SNP/Intel TDX: validation of memory pages
Date: Tue, 16 Feb 2021 18:05:47 +0100 [thread overview]
Message-ID: <c92612ab-96d1-563c-9c70-c42011e8a7fc@redhat.com> (raw)
In-Reply-To: <E12DD668-596B-4AEB-86B1-78BD0F60E85C@amacapital.net>
On 16/02/21 17:57, Andy Lutomirski wrote:
>
>
>> On Feb 16, 2021, at 7:59 AM, Paolo Bonzini <pbonzini@redhat.com>
>> wrote:
>>
>> On 16/02/21 15:46, Peter Zijlstra wrote:
>>>> On Tue, Feb 16, 2021 at 06:27:41AM -0800, Andi Kleen wrote: I
>>>> think the IST solution should at least be explored before
>>>> dismissing it. It might be simpler than anything else (like
>>>> using new APIs)
>>> Have you seen the trainwreck bonzini proposed?
>>
>> You had been suspiciously silent...
>
> Can one of you point me at the original proposal?
https://lkml.org/lkml/2020/5/15/1239
(only pseudocode)
> This sounds suspiciously like the current NMI code.
Yes, it's similar in concept. The exact circumstances of how nested #VE
happens, however, are different from NMI, and the limitation of two
nested #VEs simplifies things a bit.
> I want to look at the code. If nothing else, I suspect it’s busted wrt CET,
Yes, that's the obvious part. You'd have to add some WRSSP or whatnot.
Paolo
> but the current NMI code definitely has bugs. For example, if we are
> about to IRET from NMI and we get #VE in the IRET insn itself and
> then get a new NMI inside the #VE, we are toast.
next prev parent reply other threads:[~2021-02-16 17:05 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-02 1:51 David Rientjes
2021-02-02 13:17 ` Matthew Wilcox
2021-02-02 16:02 ` Kirill A. Shutemov
2021-02-03 0:16 ` Brijesh Singh
2021-02-11 17:46 ` Sean Christopherson
2021-02-02 22:37 ` Andi Kleen
2021-02-11 20:46 ` Peter Zijlstra
2021-02-12 13:19 ` Joerg Roedel
2021-02-12 14:17 ` Peter Zijlstra
2021-02-12 14:53 ` Joerg Roedel
2021-02-12 15:19 ` Peter Zijlstra
2021-02-12 15:28 ` Joerg Roedel
2021-02-12 16:12 ` Peter Zijlstra
2021-02-12 16:18 ` Joerg Roedel
2021-02-12 16:45 ` Peter Zijlstra
2021-02-12 17:48 ` Dave Hansen
2021-02-12 18:22 ` Sean Christopherson
2021-02-12 18:38 ` Andy Lutomirski
2021-02-12 18:43 ` Sean Christopherson
2021-02-12 18:46 ` Dave Hansen
2021-02-12 19:24 ` Sean Christopherson
2021-02-16 10:00 ` Joerg Roedel
2021-02-16 14:27 ` Andi Kleen
2021-02-16 14:46 ` Peter Zijlstra
2021-02-16 15:59 ` Paolo Bonzini
2021-02-16 16:25 ` Joerg Roedel
2021-02-16 16:48 ` Paolo Bonzini
2021-02-16 18:26 ` Joerg Roedel
2021-02-16 18:33 ` Paolo Bonzini
2021-02-16 16:47 ` Peter Zijlstra
2021-02-16 16:57 ` Andy Lutomirski
2021-02-16 17:05 ` Paolo Bonzini [this message]
2021-02-16 16:55 ` Andi Kleen
2021-02-12 21:42 ` Andi Kleen
2021-02-12 21:58 ` Peter Zijlstra
2021-02-12 22:39 ` Andi Kleen
2021-02-12 22:46 ` Andy Lutomirski
2021-02-13 9:38 ` Peter Zijlstra
2021-02-12 23:51 ` Paolo Bonzini
2021-03-23 9:33 ` Joerg Roedel
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