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From: Dave Hansen <dave.hansen@intel.com>
To: jejb@linux.ibm.com, Andy Lutomirski <luto@kernel.org>,
	David Hildenbrand <david@redhat.com>,
	Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm list <kvm@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Borislav Petkov <bp@alien8.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Joerg Roedel <jroedel@suse.de>, Andi Kleen <ak@linux.intel.com>,
	David Rientjes <rientjes@google.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Varad Gautam <varad.gautam@suse.com>,
	Dario Faggioli <dfaggioli@suse.com>,
	the arch/x86 maintainers <x86@kernel.org>,
	linux-mm@kvack.org, linux-coco@lists.linux.dev,
	"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	"Kirill A . Shutemov" <kirill@shutemov.name>,
	Sathyanarayanan Kuppuswamy 
	<sathyanarayanan.kuppuswamy@linux.intel.com>,
	Yu Zhang <yu.c.zhang@linux.intel.com>
Subject: Re: [RFC] KVM: mm: fd-based approach for supporting KVM guest private memory
Date: Wed, 1 Sep 2021 12:26:07 -0700	[thread overview]
Message-ID: <cb3b2281-8651-672a-53e0-d0c7a9407643@intel.com> (raw)
In-Reply-To: <bd22ef54224d15ee89130728c408f70da0516eaa.camel@linux.ibm.com>

On 9/1/21 9:18 AM, James Bottomley wrote:
>> So I think there are literally zero code paths that currently call
>> try_to_unmap() that will actually work like that on TDX.  If we run
>> out of memory on a TDX host, we can kill the guest completely and
>> reclaim all of its memory (which probably also involves killing QEMU
>> or whatever other user program is in charge), but that's really our
>> only option.
> I think our only option for swap is guest co-operation.

Yes, today that's the only choice.  Both TDX and SEV-SNP can
*theoretically* extend their architectures to enable swap with
uncooperative guests.  But, frankly, nobody has been asking for it.

If you care, please ask Intel and AMD to fix this gap.

  parent reply	other threads:[~2021-09-01 19:26 UTC|newest]

Thread overview: 142+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24  0:52 [RFC] KVM: mm: fd-based approach for supporting KVM guest private memory Sean Christopherson
2021-08-24  0:52 ` Sean Christopherson
2021-08-24 10:48 ` Yu Zhang
2021-08-24 10:48   ` Yu Zhang
2021-08-26  0:35   ` Sean Christopherson
2021-08-26  0:35     ` Sean Christopherson
2021-08-26 13:23     ` Yu Zhang
2021-08-26 13:23       ` Yu Zhang
2021-08-26 10:15 ` David Hildenbrand
2021-08-26 10:15   ` David Hildenbrand
2021-08-26 17:05   ` Andy Lutomirski
2021-08-26 17:05     ` Andy Lutomirski
2021-08-26 21:26     ` David Hildenbrand
2021-08-26 21:26       ` David Hildenbrand
2021-08-27 18:24       ` Andy Lutomirski
2021-08-27 18:24         ` Andy Lutomirski
2021-08-27 22:28         ` Sean Christopherson
2021-08-27 22:28           ` Sean Christopherson
2021-08-31 19:12           ` David Hildenbrand
2021-08-31 19:12             ` David Hildenbrand
2021-08-31 20:45             ` Sean Christopherson
2021-08-31 20:45               ` Sean Christopherson
2021-09-01  7:51               ` David Hildenbrand
2021-09-01  7:51                 ` David Hildenbrand
2021-08-27  2:31   ` Yu Zhang
2021-08-27  2:31     ` Yu Zhang
2021-08-31 19:08     ` David Hildenbrand
2021-08-31 19:08       ` David Hildenbrand
2021-08-31 20:01       ` Andi Kleen
2021-08-31 20:01         ` Andi Kleen
2021-08-31 20:15         ` David Hildenbrand
2021-08-31 20:15           ` David Hildenbrand
2021-08-31 20:39           ` Andi Kleen
2021-08-31 20:39             ` Andi Kleen
2021-09-01  3:34             ` Yu Zhang
2021-09-01  3:34               ` Yu Zhang
2021-09-01  4:53     ` Andy Lutomirski
2021-09-01  4:53       ` Andy Lutomirski
2021-09-01  7:12       ` Tian, Kevin
2021-09-01  7:12         ` Tian, Kevin
2021-09-01 10:24       ` Yu Zhang
2021-09-01 10:24         ` Yu Zhang
2021-09-01 16:07         ` Andy Lutomirski
2021-09-01 16:07           ` Andy Lutomirski
2021-09-01 16:27           ` David Hildenbrand
2021-09-01 16:27             ` David Hildenbrand
2021-09-02  8:34             ` Yu Zhang
2021-09-02  8:34               ` Yu Zhang
2021-09-02  8:44               ` David Hildenbrand
2021-09-02  8:44                 ` David Hildenbrand
2021-09-02 11:02                 ` Yu Zhang
2021-09-02 11:02                   ` Yu Zhang
2021-09-02  8:19           ` Yu Zhang
2021-09-02  8:19             ` Yu Zhang
2021-09-02 18:41             ` Andy Lutomirski
2021-09-02 18:41               ` Andy Lutomirski
2021-09-07  1:33             ` Yan Zhao
2021-09-07  1:33               ` Yan Zhao
2021-09-02  9:27           ` Joerg Roedel
2021-09-02  9:27             ` Joerg Roedel
2021-09-02 18:41             ` Andy Lutomirski
2021-09-02 18:41               ` Andy Lutomirski
2021-09-02 18:57               ` Sean Christopherson
2021-09-02 18:57                 ` Sean Christopherson
2021-09-02 19:07                 ` Dave Hansen
2021-09-02 19:07                   ` Dave Hansen
2021-09-02 20:42                   ` Andy Lutomirski
2021-09-02 20:42                     ` Andy Lutomirski
2021-08-27 22:18   ` Sean Christopherson
2021-08-27 22:18     ` Sean Christopherson
2021-08-31 19:07     ` David Hildenbrand
2021-08-31 19:07       ` David Hildenbrand
2021-08-31 21:54       ` Sean Christopherson
2021-08-31 21:54         ` Sean Christopherson
2021-09-01  8:09         ` David Hildenbrand
2021-09-01  8:09           ` David Hildenbrand
2021-09-01 15:54           ` Andy Lutomirski
2021-09-01 15:54             ` Andy Lutomirski
2021-09-01 16:16             ` David Hildenbrand
2021-09-01 16:16               ` David Hildenbrand
2021-09-01 17:09               ` Andy Lutomirski
2021-09-01 17:09                 ` Andy Lutomirski
2021-09-01 16:18             ` James Bottomley
2021-09-01 16:18               ` James Bottomley
2021-09-01 16:22               ` David Hildenbrand
2021-09-01 16:22                 ` David Hildenbrand
2021-09-01 16:31                 ` James Bottomley
2021-09-01 16:31                   ` James Bottomley
2021-09-01 16:37                   ` David Hildenbrand
2021-09-01 16:37                     ` David Hildenbrand
2021-09-01 16:45                     ` James Bottomley
2021-09-01 16:45                       ` James Bottomley
2021-09-01 17:08                       ` David Hildenbrand
2021-09-01 17:08                         ` David Hildenbrand
2021-09-01 17:50                         ` Sean Christopherson
2021-09-01 17:50                           ` Sean Christopherson
2021-09-01 17:53                           ` David Hildenbrand
2021-09-01 17:53                             ` David Hildenbrand
2021-09-01 17:08               ` Andy Lutomirski
2021-09-01 17:08                 ` Andy Lutomirski
2021-09-01 17:13                 ` James Bottomley
2021-09-01 17:13                   ` James Bottomley
2021-09-02 10:18                 ` Joerg Roedel
2021-09-02 10:18                   ` Joerg Roedel
2021-09-01 18:24               ` Andy Lutomirski
2021-09-01 18:24                 ` Andy Lutomirski
2021-09-01 19:26               ` Dave Hansen [this message]
2021-09-01 19:26                 ` Dave Hansen
2021-09-07 15:00               ` Tom Lendacky
2021-09-07 15:00                 ` Tom Lendacky
2021-09-01  4:58       ` Andy Lutomirski
2021-09-01  4:58         ` Andy Lutomirski
2021-09-01  7:49         ` David Hildenbrand
2021-09-01  7:49           ` David Hildenbrand
2021-09-02 18:47 ` Kirill A. Shutemov
2021-09-02 18:47   ` Kirill A. Shutemov
2021-09-02 20:33   ` Sean Christopherson
2021-09-02 20:33     ` Sean Christopherson
2021-09-03 19:14     ` Kirill A. Shutemov
2021-09-03 19:14       ` Kirill A. Shutemov
2021-09-03 19:15       ` Andy Lutomirski
2021-09-03 19:15         ` Andy Lutomirski
2021-09-10 17:18         ` Kirill A. Shutemov
2021-09-10 17:18           ` Kirill A. Shutemov
2021-09-15 19:58           ` Chao Peng
2021-09-15 19:58             ` Chao Peng
2021-09-15 13:51             ` David Hildenbrand
2021-09-15 13:51               ` David Hildenbrand
2021-09-15 14:29               ` Kirill A. Shutemov
2021-09-15 14:29                 ` Kirill A. Shutemov
2021-09-15 14:59                 ` David Hildenbrand
2021-09-15 14:59                   ` David Hildenbrand
2021-09-15 15:35                   ` David Hildenbrand
2021-09-15 15:35                     ` David Hildenbrand
2021-09-15 20:04                   ` Kirill A. Shutemov
2021-09-15 20:04                     ` Kirill A. Shutemov
2021-09-15 14:11             ` Kirill A. Shutemov
2021-09-15 14:11               ` Kirill A. Shutemov
2021-09-16  7:36               ` Chao Peng
2021-09-16  7:36                 ` Chao Peng
2021-09-16  9:24               ` Paolo Bonzini
2021-09-16  9:24                 ` Paolo Bonzini

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