From: "Andy Lutomirski" <luto@kernel.org>
To: "Sean Christopherson" <seanjc@google.com>
Cc: "Quentin Perret" <qperret@google.com>,
"Steven Price" <steven.price@arm.com>,
"Chao Peng" <chao.p.peng@linux.intel.com>,
"kvm list" <kvm@vger.kernel.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
"Linux API" <linux-api@vger.kernel.org>,
qemu-devel@nongnu.org, "Paolo Bonzini" <pbonzini@redhat.com>,
"Jonathan Corbet" <corbet@lwn.net>,
"Vitaly Kuznetsov" <vkuznets@redhat.com>,
"Wanpeng Li" <wanpengli@tencent.com>,
"Jim Mattson" <jmattson@google.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"the arch/x86 maintainers" <x86@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
"Hugh Dickins" <hughd@google.com>,
"Jeff Layton" <jlayton@kernel.org>,
"J . Bruce Fields" <bfields@fieldses.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Mike Rapoport" <rppt@kernel.org>,
"Maciej S . Szmigiero" <mail@maciej.szmigiero.name>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Vishal Annapurve" <vannapurve@google.com>,
"Yu Zhang" <yu.c.zhang@linux.intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
"Nakajima, Jun" <jun.nakajima@intel.com>,
"Dave Hansen" <dave.hansen@intel.com>,
"Andi Kleen" <ak@linux.intel.com>,
"David Hildenbrand" <david@redhat.com>,
"Marc Zyngier" <maz@kernel.org>, "Will Deacon" <will@kernel.org>
Subject: Re: [PATCH v5 00/13] KVM: mm: fd-based approach for supporting KVM guest private memory
Date: Wed, 06 Apr 2022 11:42:17 -0700 [thread overview]
Message-ID: <4ae11ddc-0fe6-4644-a30e-006d99dba456@www.fastmail.com> (raw)
In-Reply-To: <YkyKywkQYbr9U0CA@google.com>
On Tue, Apr 5, 2022, at 11:30 AM, Sean Christopherson wrote:
> On Tue, Apr 05, 2022, Andy Lutomirski wrote:
>
>> resume guest
>> *** host -> hypervisor -> guest ***
>> Guest unshares the page.
>> *** guest -> hypervisor ***
>> Hypervisor removes PTE. TLBI.
>> *** hypervisor -> guest ***
>>
>> Obviously considerable cleverness is needed to make a virt IOMMU like this
>> work well, but still.
>>
>> Anyway, my suggestion is that the fd backing proposal get slightly modified
>> to get it ready for multiple subtypes of backing object, which should be a
>> pretty minimal change. Then, if someone actually needs any of this
>> cleverness, it can be added later. In the mean time, the
>> pread()/pwrite()/splice() scheme is pretty good.
>
> Tangentially related to getting private-fd ready for multiple things,
> what about
> implementing the pread()/pwrite()/splice() scheme in pKVM itself? I.e.
> read() on
> the VM fd, with the offset corresponding to gfn in some way.
>
Hmm, could make sense.
next prev parent reply other threads:[~2022-04-06 20:23 UTC|newest]
Thread overview: 116+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-10 14:08 [PATCH v5 00/13] KVM: mm: fd-based approach for supporting KVM guest private memory Chao Peng
2022-03-10 14:08 ` [PATCH v5 01/13] mm/memfd: Introduce MFD_INACCESSIBLE flag Chao Peng
2022-04-11 15:10 ` Kirill A. Shutemov
2022-04-12 13:11 ` Chao Peng
2022-04-23 5:43 ` Vishal Annapurve
2022-04-24 8:15 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 02/13] mm: Introduce memfile_notifier Chao Peng
2022-03-29 18:45 ` Sean Christopherson
2022-04-08 12:54 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 03/13] mm/shmem: Support memfile_notifier Chao Peng
2022-03-10 23:08 ` Dave Chinner
2022-03-11 8:42 ` Chao Peng
2022-04-11 15:26 ` Kirill A. Shutemov
2022-04-12 13:12 ` Chao Peng
2022-04-19 22:40 ` Vishal Annapurve
2022-04-20 3:24 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 04/13] mm/shmem: Restrict MFD_INACCESSIBLE memory against RLIMIT_MEMLOCK Chao Peng
2022-04-07 16:05 ` Sean Christopherson
2022-04-07 17:09 ` Andy Lutomirski
2022-04-08 17:56 ` Sean Christopherson
2022-04-08 18:54 ` David Hildenbrand
2022-04-12 14:36 ` Jason Gunthorpe
2022-04-12 21:27 ` Andy Lutomirski
2022-04-13 16:30 ` David Hildenbrand
2022-04-13 16:24 ` David Hildenbrand
2022-04-13 17:52 ` Jason Gunthorpe
2022-04-25 14:07 ` David Hildenbrand
2022-04-08 13:02 ` Chao Peng
2022-04-11 15:34 ` Kirill A. Shutemov
2022-04-12 5:14 ` Hugh Dickins
2022-04-11 15:32 ` Kirill A. Shutemov
2022-04-12 13:39 ` Chao Peng
2022-04-12 19:28 ` Kirill A. Shutemov
2022-04-13 9:15 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 05/13] KVM: Extend the memslot to support fd-based private memory Chao Peng
2022-03-28 21:27 ` Sean Christopherson
2022-04-08 13:21 ` Chao Peng
2022-03-28 21:56 ` Sean Christopherson
2022-04-08 13:46 ` Chao Peng
2022-04-08 17:45 ` Sean Christopherson
2022-03-10 14:09 ` [PATCH v5 06/13] KVM: Use kvm_userspace_memory_region_ext Chao Peng
2022-03-28 22:26 ` Sean Christopherson
2022-04-08 13:58 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 07/13] KVM: Add KVM_EXIT_MEMORY_ERROR exit Chao Peng
2022-03-28 22:33 ` Sean Christopherson
2022-04-08 13:59 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 08/13] KVM: Use memfile_pfn_ops to obtain pfn for private pages Chao Peng
2022-03-28 23:56 ` Sean Christopherson
2022-04-08 14:07 ` Chao Peng
2022-04-28 12:37 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 09/13] KVM: Handle page fault for private memory Chao Peng
2022-03-29 1:07 ` Sean Christopherson
2022-04-12 12:10 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 10/13] KVM: Register private memslot to memory backing store Chao Peng
2022-03-29 19:01 ` Sean Christopherson
2022-04-12 12:40 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 11/13] KVM: Zap existing KVM mappings when pages changed in the private fd Chao Peng
2022-03-29 19:23 ` Sean Christopherson
2022-04-12 12:43 ` Chao Peng
2022-04-05 23:45 ` Michael Roth
2022-04-08 3:06 ` Sean Christopherson
2022-04-19 22:43 ` Vishal Annapurve
2022-04-20 3:17 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 12/13] KVM: Expose KVM_MEM_PRIVATE Chao Peng
2022-03-29 19:13 ` Sean Christopherson
2022-04-12 12:56 ` Chao Peng
2022-03-10 14:09 ` [PATCH v5 13/13] memfd_create.2: Describe MFD_INACCESSIBLE flag Chao Peng
2022-03-24 15:51 ` [PATCH v5 00/13] KVM: mm: fd-based approach for supporting KVM guest private memory Quentin Perret
2022-03-28 17:13 ` Sean Christopherson
2022-03-28 18:00 ` Quentin Perret
2022-03-28 18:58 ` Sean Christopherson
2022-03-29 17:01 ` Quentin Perret
2022-03-30 8:58 ` Steven Price
2022-03-30 10:39 ` Quentin Perret
2022-03-30 17:58 ` Sean Christopherson
2022-03-31 16:04 ` Andy Lutomirski
2022-04-01 14:59 ` Quentin Perret
2022-04-01 17:14 ` Sean Christopherson
2022-04-01 18:03 ` Quentin Perret
2022-04-01 18:24 ` Sean Christopherson
2022-04-01 19:56 ` Andy Lutomirski
2022-04-04 15:01 ` Quentin Perret
2022-04-04 17:06 ` Sean Christopherson
2022-04-04 22:04 ` Andy Lutomirski
2022-04-05 10:36 ` Quentin Perret
2022-04-05 17:51 ` Andy Lutomirski
2022-04-05 18:30 ` Sean Christopherson
2022-04-06 18:42 ` Andy Lutomirski [this message]
2022-04-06 13:05 ` Quentin Perret
2022-04-05 18:03 ` Sean Christopherson
2022-04-06 10:34 ` Quentin Perret
2022-04-22 10:56 ` Chao Peng
2022-04-22 11:06 ` Paolo Bonzini
2022-04-24 8:07 ` Chao Peng
2022-04-24 16:59 ` Andy Lutomirski
2022-04-25 13:40 ` Chao Peng
2022-04-25 14:52 ` Andy Lutomirski
2022-04-25 20:30 ` Sean Christopherson
2022-06-10 19:18 ` Andy Lutomirski
2022-06-10 19:27 ` Sean Christopherson
2022-04-28 12:29 ` Chao Peng
2022-05-03 11:12 ` Quentin Perret
2022-05-09 22:30 ` Michael Roth
2022-05-09 23:29 ` Sean Christopherson
2022-07-21 20:05 ` Gupta, Pankaj
2022-07-21 21:19 ` Sean Christopherson
2022-07-21 21:36 ` Gupta, Pankaj
2022-07-23 3:09 ` Andy Lutomirski
2022-07-25 9:19 ` Gupta, Pankaj
2022-03-30 16:18 ` Sean Christopherson
2022-03-28 20:16 ` Andy Lutomirski
2022-03-28 22:48 ` Nakajima, Jun
2022-03-29 0:04 ` Sean Christopherson
2022-04-08 21:35 ` Vishal Annapurve
2022-04-12 13:00 ` Chao Peng
2022-04-12 19:58 ` Kirill A. Shutemov
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