From: Chao Peng <chao.p.peng@linux.intel.com>
To: Mike Rapoport <rppt@kernel.org>
Cc: linux-api@vger.kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org, qemu-devel@nongnu.org,
Paolo Bonzini <pbonzini@redhat.com>,
Jonathan Corbet <corbet@lwn.net>,
Sean Christopherson <seanjc@google.com>,
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>,
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>,
Yu Zhang <yu.c.zhang@linux.intel.com>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
luto@kernel.org, jun.nakajima@intel.com, dave.hansen@intel.com,
ak@linux.intel.com, david@redhat.com
Subject: Re: [PATCH v4 00/12] KVM: mm: fd-based approach for supporting KVM guest private memory
Date: Thu, 17 Feb 2022 21:47:05 +0800 [thread overview]
Message-ID: <20220217134705.GB33836@chaop.bj.intel.com> (raw)
In-Reply-To: <YgK3buC2xes9/lLj@kernel.org>
On Tue, Feb 08, 2022 at 08:33:18PM +0200, Mike Rapoport wrote:
> (addded linux-api)
>
> On Tue, Jan 18, 2022 at 09:21:09PM +0800, Chao Peng wrote:
> > This is the v4 of this series which try to implement the fd-based KVM
> > guest private memory. The patches are based on latest kvm/queue branch
> > commit:
> >
> > fea31d169094 KVM: x86/pmu: Fix available_event_types check for
> > REF_CPU_CYCLES event
> >
> > Introduction
> > ------------
> > In general this patch series introduce fd-based memslot which provides
> > guest memory through memory file descriptor fd[offset,size] instead of
> > hva/size. The fd can be created from a supported memory filesystem
> > like tmpfs/hugetlbfs etc. which we refer as memory backing store. KVM
> > and the the memory backing store exchange callbacks when such memslot
> > gets created. At runtime KVM will call into callbacks provided by the
> > backing store to get the pfn with the fd+offset. Memory backing store
> > will also call into KVM callbacks when userspace fallocate/punch hole
> > on the fd to notify KVM to map/unmap secondary MMU page tables.
> >
> > Comparing to existing hva-based memslot, this new type of memslot allows
> > guest memory unmapped from host userspace like QEMU and even the kernel
> > itself, therefore reduce attack surface and prevent bugs.
> >
> > Based on this fd-based memslot, we can build guest private memory that
> > is going to be used in confidential computing environments such as Intel
> > TDX and AMD SEV. When supported, the memory backing store can provide
> > more enforcement on the fd and KVM can use a single memslot to hold both
> > the private and shared part of the guest memory.
> >
> > mm extension
> > ---------------------
> > Introduces new F_SEAL_INACCESSIBLE for shmem and new MFD_INACCESSIBLE
> > flag for memfd_create(), the file created with these flags cannot read(),
> > write() or mmap() etc via normal MMU operations. The file content can
> > only be used with the newly introduced memfile_notifier extension.
>
> It would be great to see man page draft for new ABI flags
Yes I can provide the man page.
Thanks,
Chao
prev parent reply other threads:[~2022-02-17 13:47 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-18 13:21 [PATCH v4 00/12] KVM: mm: fd-based approach for supporting KVM guest private memory Chao Peng
2022-01-18 13:21 ` [PATCH v4 01/12] mm/shmem: Introduce F_SEAL_INACCESSIBLE Chao Peng
2022-02-07 12:24 ` Vlastimil Babka
2022-02-17 12:56 ` Chao Peng
2022-02-11 23:33 ` Andy Lutomirski
2022-02-17 13:06 ` Chao Peng
2022-02-17 19:09 ` Andy Lutomirski
2022-02-23 11:49 ` Chao Peng
2022-02-23 12:05 ` Steven Price
2022-03-04 19:24 ` Andy Lutomirski
2022-03-07 13:26 ` Chao Peng
2022-03-08 12:17 ` Paolo Bonzini
2022-01-18 13:21 ` [PATCH v4 02/12] mm/memfd: Introduce MFD_INACCESSIBLE flag Chao Peng
2022-01-21 15:50 ` Steven Price
2022-01-24 13:29 ` Chao Peng
2022-02-07 18:51 ` Vlastimil Babka
2022-02-08 8:49 ` David Hildenbrand
2022-02-08 18:22 ` Mike Rapoport
2022-01-18 13:21 ` [PATCH v4 03/12] mm: Introduce memfile_notifier Chao Peng
2022-03-07 15:42 ` Vlastimil Babka
2022-03-08 1:45 ` Chao Peng
2022-01-18 13:21 ` [PATCH v4 04/12] mm/shmem: Support memfile_notifier Chao Peng
2022-02-08 18:29 ` Mike Rapoport
2022-02-17 13:10 ` Chao Peng
2022-02-11 23:40 ` Andy Lutomirski
2022-02-17 13:23 ` Chao Peng
2022-01-18 13:21 ` [PATCH v4 05/12] KVM: Extend the memslot to support fd-based private memory Chao Peng
2022-01-18 13:21 ` [PATCH v4 06/12] KVM: Use kvm_userspace_memory_region_ext Chao Peng
2022-01-18 13:21 ` [PATCH v4 07/12] KVM: Add KVM_EXIT_MEMORY_ERROR exit Chao Peng
2022-01-18 13:21 ` [PATCH v4 08/12] KVM: Use memfile_pfn_ops to obtain pfn for private pages Chao Peng
2022-01-18 13:21 ` [PATCH v4 09/12] KVM: Handle page fault for private memory Chao Peng
2022-01-18 13:21 ` [PATCH v4 10/12] KVM: Register private memslot to memory backing store Chao Peng
2022-01-18 13:21 ` [PATCH v4 11/12] KVM: Zap existing KVM mappings when pages changed in the private fd Chao Peng
2022-01-18 13:21 ` [PATCH v4 12/12] KVM: Expose KVM_MEM_PRIVATE Chao Peng
2022-01-25 20:20 ` Maciej S. Szmigiero
2022-02-17 13:45 ` Chao Peng
2022-02-22 1:16 ` Maciej S. Szmigiero
2022-02-23 12:00 ` Chao Peng
2022-02-23 18:32 ` Maciej S. Szmigiero
2022-02-24 8:07 ` Chao Peng
2022-01-28 16:47 ` [PATCH v4 00/12] KVM: mm: fd-based approach for supporting KVM guest private memory Steven Price
2022-02-02 2:28 ` Nakajima, Jun
2022-02-02 9:23 ` Steven Price
2022-02-02 20:47 ` Nakajima, Jun
2022-02-08 18:33 ` Mike Rapoport
2022-02-17 13:47 ` Chao Peng [this message]
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