From: Joerg Roedel <jroedel@suse.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: 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>,
Andi Kleen <ak@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>,
Paolo Bonzini <pbonzini@redhat.com>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, linux-mm@kvack.org
Subject: Re: AMD SEV-SNP/Intel TDX: validation of memory pages
Date: Fri, 12 Feb 2021 16:28:13 +0100 [thread overview]
Message-ID: <20210212152813.GA28884@suse.de> (raw)
In-Reply-To: <YCacenGvoQsTmVcy@hirez.programming.kicks-ass.net>
On Fri, Feb 12, 2021 at 04:19:22PM +0100, Peter Zijlstra wrote:
> That's the thing, we don't want #VE to happen in noinstr code *ever*.
>
> noinstr covers the whole entry code, things like the syscall gap and nmi
> recursion setup. Getting a #VE there is fail.
I don't know the details about TDX and #VE, but could a malicious HV not
trigger a #VE basically everywhere by mapping around pages? So 'fail'
means panic() in this case, right?
> So most per-cpu data can be on-demand, but some of it must absolutely
> not be.
The kernel can validate those itself in the early setup code, the
decompressor shouldn't care about those details.
Regards,
Joerg
next prev parent reply other threads:[~2021-02-12 15:28 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 [this message]
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
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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