From: Matthew Wilcox <willy@infradead.org>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Sean Christopherson <seanjc@google.com>,
Jim Mattson <jmattson@google.com>,
David Rientjes <rientjes@google.com>,
"Edgecombe, Rick P" <rick.p.edgecombe@intel.com>,
"Kleen, Andi" <andi.kleen@intel.com>,
"Yamahata, Isaku" <isaku.yamahata@intel.com>,
Erdem Aktas <erdemaktas@google.com>,
Steve Rutherford <srutherford@google.com>,
Peter Gonda <pgonda@google.com>,
David Hildenbrand <david@redhat.com>,
x86@kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFCv2 00/13] TDX and guest memory unmapping
Date: Fri, 16 Apr 2021 17:46:02 +0100 [thread overview]
Message-ID: <20210416164602.GN2531743@casper.infradead.org> (raw)
In-Reply-To: <20210416154106.23721-1-kirill.shutemov@linux.intel.com>
On Fri, Apr 16, 2021 at 06:40:53PM +0300, Kirill A. Shutemov wrote:
> TDX integrity check failures may lead to system shutdown host kernel must
> not allow any writes to TD-private memory. This requirment clashes with
> KVM design: KVM expects the guest memory to be mapped into host userspace
> (e.g. QEMU).
>
> This patchset aims to start discussion on how we can approach the issue.
>
> The core of the change is in the last patch. Please see more detailed
> description of the issue and proposoal of the solution there.
This seems to have some parallels with s390's arch_make_page_accessible().
Is there any chance to combine the two, so we don't end up with duplicated
hooks all over the MM for this kind of thing?
https://patchwork.kernel.org/project/kvm/cover/20200214222658.12946-1-borntraeger@de.ibm.com/
and recent THP/Folio-related discussion:
https://lore.kernel.org/linux-mm/20210409194059.GW2531743@casper.infradead.org/
next prev parent reply other threads:[~2021-04-16 16:46 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-16 15:40 [RFCv2 00/13] TDX and guest memory unmapping Kirill A. Shutemov
2021-04-16 15:40 ` [RFCv2 01/13] x86/mm: Move force_dma_unencrypted() to common code Kirill A. Shutemov
2021-04-16 15:40 ` [RFCv2 02/13] x86/kvm: Introduce KVM memory protection feature Kirill A. Shutemov
2021-04-16 16:10 ` Borislav Petkov
2021-04-19 10:10 ` Kirill A. Shutemov
2021-04-16 15:40 ` [RFCv2 03/13] x86/kvm: Make DMA pages shared Kirill A. Shutemov
2021-04-16 15:40 ` [RFCv2 04/13] x86/kvm: Use bounce buffers for KVM memory protection Kirill A. Shutemov
2021-04-16 16:21 ` Dave Hansen
2021-04-16 15:40 ` [RFCv2 05/13] x86/kvmclock: Share hvclock memory with the host Kirill A. Shutemov
2021-04-16 15:40 ` [RFCv2 06/13] x86/realmode: Share trampoline area if KVM memory protection enabled Kirill A. Shutemov
2021-04-19 16:49 ` Dave Hansen
2021-04-16 15:41 ` [RFCv2 07/13] mm: Add hwpoison_entry_to_pfn() and hwpoison_entry_to_page() Kirill A. Shutemov
2021-04-16 15:41 ` [RFCv2 08/13] mm/gup: Add FOLL_ALLOW_POISONED Kirill A. Shutemov
2021-04-16 15:41 ` [RFCv2 09/13] shmem: Fail shmem_getpage_gfp() on poisoned pages Kirill A. Shutemov
2021-04-16 15:41 ` [RFCv2 10/13] mm: Keep page reference for hwpoison entries Kirill A. Shutemov
2021-04-16 15:41 ` [RFCv2 11/13] mm: Replace hwpoison entry with present PTE if page got unpoisoned Kirill A. Shutemov
2021-04-16 15:41 ` [RFCv2 12/13] KVM: passdown struct kvm to hva_to_pfn_slow() Kirill A. Shutemov
2021-04-16 15:41 ` [RFCv2 13/13] KVM: unmap guest memory using poisoned pages Kirill A. Shutemov
2021-04-16 17:30 ` Sean Christopherson
2021-04-19 11:32 ` Xiaoyao Li
2021-04-19 14:26 ` Kirill A. Shutemov
2021-04-19 16:01 ` Sean Christopherson
2021-04-19 16:40 ` Kirill A. Shutemov
2021-04-19 18:09 ` Sean Christopherson
2021-04-19 18:12 ` David Hildenbrand
2021-04-19 18:53 ` Kirill A. Shutemov
2021-04-19 20:09 ` Sean Christopherson
2021-04-19 22:57 ` Kirill A. Shutemov
2021-04-20 17:13 ` Sean Christopherson
2021-05-21 12:31 ` Kirill A. Shutemov
2021-05-26 19:46 ` Sean Christopherson
2021-05-31 20:07 ` Kirill A. Shutemov
2021-06-02 17:51 ` Sean Christopherson
2021-06-02 23:33 ` Kirill A. Shutemov
2021-06-03 19:46 ` Sean Christopherson
2021-06-04 14:29 ` Kirill A. Shutemov
2021-06-04 17:16 ` Andy Lutomirski
2021-06-04 17:54 ` Kirill A. Shutemov
2021-04-16 16:46 ` Matthew Wilcox [this message]
2021-04-22 14:36 [RFCv2 00/13] TDX and guest memory unmapping Jue Wang
2021-04-22 14:36 ` Jue Wang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210416164602.GN2531743@casper.infradead.org \
--to=willy@infradead.org \
--cc=andi.kleen@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=david@redhat.com \
--cc=erdemaktas@google.com \
--cc=isaku.yamahata@intel.com \
--cc=jmattson@google.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=luto@kernel.org \
--cc=peterz@infradead.org \
--cc=pgonda@google.com \
--cc=rick.p.edgecombe@intel.com \
--cc=rientjes@google.com \
--cc=seanjc@google.com \
--cc=srutherford@google.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.