From: Fuad Tabba <tabba@google.com>
To: Chao Peng <chao.p.peng@linux.intel.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-api@vger.kernel.org, linux-doc@vger.kernel.org,
qemu-devel@nongnu.org, linux-kselftest@vger.kernel.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>,
Shuah Khan <shuah@kernel.org>, Mike Rapoport <rppt@kernel.org>,
Steven Price <steven.price@arm.com>,
"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>,
luto@kernel.org, jun.nakajima@intel.com, dave.hansen@intel.com,
ak@linux.intel.com, david@redhat.com, aarcange@redhat.com,
ddutile@redhat.com, dhildenb@redhat.com,
Quentin Perret <qperret@google.com>,
Michael Roth <michael.roth@amd.com>,
mhocko@suse.com, Muchun Song <songmuchun@bytedance.com>,
Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>
Subject: Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory
Date: Wed, 31 Aug 2022 10:12:12 +0100 [thread overview]
Message-ID: <CA+EHjTxgKJ=9UP=DWtNsSgD2FtvBMYrUbcS=9h5j8Tmk57WqxQ@mail.gmail.com> (raw)
In-Reply-To: <20220829151756.GB1586678@chaop.bj.intel.com>
Hi Chao,
Thank you for your reply.
On Mon, Aug 29, 2022 at 4:23 PM Chao Peng <chao.p.peng@linux.intel.com> wrote:
>
> On Fri, Aug 26, 2022 at 04:19:25PM +0100, Fuad Tabba wrote:
> > Hi,
> >
> > On Wed, Jul 6, 2022 at 9:24 AM Chao Peng <chao.p.peng@linux.intel.com> wrote:
> > >
> > > This is the v7 of this series which tries to implement the fd-based KVM
> > > guest private memory. The patches are based on latest kvm/queue branch
> > > commit:
> > >
> > > b9b71f43683a (kvm/queue) KVM: x86/mmu: Buffer nested MMU
> > > split_desc_cache only by default capacity
> > >
> > > 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 punch hole on the fd
> > > to notify KVM to unmap secondary MMU page table entries.
> > >
> > > 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 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.
> > >
> > > The memfile_notifier extension provides two sets of callbacks for KVM to
> > > interact with the memory backing store:
> > > - memfile_notifier_ops: callbacks for memory backing store to notify
> > > KVM when memory gets invalidated.
> > > - backing store callbacks: callbacks for KVM to call into memory
> > > backing store to request memory pages for guest private memory.
> > >
> > > The memfile_notifier extension also provides APIs for memory backing
> > > store to register/unregister itself and to trigger the notifier when the
> > > bookmarked memory gets invalidated.
> > >
> > > The patchset also introduces a new memfd seal F_SEAL_AUTO_ALLOCATE to
> > > prevent double allocation caused by unintentional guest when we only
> > > have a single side of the shared/private memfds effective.
> > >
> > > memslot extension
> > > -----------------
> > > Add the private fd and the fd offset to existing 'shared' memslot so
> > > that both private/shared guest memory can live in one single memslot.
> > > A page in the memslot is either private or shared. Whether a guest page
> > > is private or shared is maintained through reusing existing SEV ioctls
> > > KVM_MEMORY_ENCRYPT_{UN,}REG_REGION.
> > >
> >
> > I'm on the Android pKVM team at Google, and we've been looking into
> > how this approach fits with what we've been doing with pkvm/arm64.
> > I've had a go at porting your patches, along with some fixes and
> > additions so it would go on top of our latest pkvm patch series [1] to
> > see how well this proposal fits with what we’re doing. You can find
> > the ported code at this link [2].
> >
> > In general, an fd-based approach fits very well with pKVM for the
> > reasons you mention. It means that we don't necessarily need to map
> > the guest memory, and with the new extensions it allows the host
> > kernel to control whether to restrict migration and swapping.
>
> Good to hear that.
>
> >
> > For pKVM, we would also need the guest private memory not to be
> > GUP’able by the kernel so that userspace can’t trick the kernel into
> > accessing guest private memory in a context where it isn’t prepared to
> > handle the fault injected by the hypervisor. We’re looking at whether
> > we could use memfd_secret to achieve this, or maybe whether extending
> > your work might solve the problem.
>
> This is interesting and can be a valuable addition to this series.
I'll keep you posted as it goes. I think with the work that you've
already put in, it wouldn't require that much more.
> >
> > However, during the porting effort, the main issue we've encountered
> > is that many of the details of this approach seem to be targeted at
> > TDX/SEV and don’t readily align with the design of pKVM. My knowledge
> > on TDX is very rudimentary, so please bear with me if I get things
> > wrong.
>
> No doubt this series is initially designed for confidential computing
> usages, but pKVM can definitely extend it if it finds useful.
>
> >
> > The idea of the memslot having two references to the backing memory,
> > the (new) private_fd (a file descriptor) as well as the userspace_addr
> > (a memory address), with the meaning changing depending on whether the
> > memory is private or shared. Both can potentially be live at the same
> > time, but only one is used by the guest depending on whether the
> > memory is shared or private. For pKVM, the memory region is the same,
> > and whether the underlying physical page is shared or private is
> > determined by the hypervisor based on the initial configuration of the
> > VM and also in response to hypercalls from the guest.
>
> For confidential computing usages, this is actually the same. The shared
> or private is determined by initial configuration or guest hypercalls.
>
> > So at least from
> > our side, having a private_fd isn't the best fit, but rather just
> > having an fd instead of a userspace_addr.
>
> Let me understand this a bit: pKVM basically wants to maintain the
> shared and private memory in only one fd, and not use userspace_addr at
> all, right? Any blocking for pKVM to use private_fd + userspace_addr
> instead?
> >
> > Moreover, something which was discussed here before [3], is the
> > ability to share in-place. For pKVM/arm64, the conversion between
> > shared and private involves only changes to the stage-2 page tables,
> > which are controlled by the hypervisor. Android supports this in-place
> > conversion already, and I think that the cost of copying for many
> > use-cases that would involve large amounts of data would be big. We
> > will measure the relative costs in due course, but in the meantime
> > we’re nervous about adopting a new user ABI which doesn’t appear to
> > cater for in-place conversion; having just the fd would simplify that
> > somewhat
>
> I understand there is difficulty to achieve that with the current
> private_fd + userspace_addr (they basically in two separate fds), but is
> it possible for pKVM to extend this? Brainstorming for example, pKVM can
> ignore userspace_addr and only use private_fd to cover both shared and
> private memory, or pKVM introduce new KVM memslot flag?
It's not that there's anything blocking pKVM from doing that. It's
that the disconnect of using a memory address for the shared memory,
and a file descriptor for the private memory doesn't really make sense
for pKVM. I see how it makes sense for TDX and the Intel-specific
implementation. It just seems that this is baking in an
implementation-specific aspect as a part of the KVM general api, and
the worry is that this might have some unintended consequences in the
future.
> >
> > In the memfd approach, what is the plan for being able to initialize
> > guest private memory from the host? In my port of this patch series,
> > I've added an fcntl() command that allows setting INACCESSIBLE after
> > the memfd has been created. So the memory can be mapped, initialized,
> > then unmapped. Of course there is no way to enforce that the memory is
> > unmapped from userspace before being used as private memory, but the
> > hypervisor will take care of the stage-2 mapping and so a user access
> > to the private memory would result in a SEGV regardless of the flag
>
> There is discussion on removing MFD_INACCESSIBLE and delaying the
> alignment of the flag to the KVM/backing store binding time
> (https://lkml.kernel.org/lkml/20220824094149.GA1383966@chaop.bj.intel.com/).
>
> Creating new API like what you are playing with fcntl() also works if it
> turns out the MFD_INACCESSIBLE has to be set at the memfd_create time.
That makes sense.
> >
> > Now, moving on to implementation-specific issues in this patch series
> > that I have encountered:
> >
> > - There are a couple of small issues in porting the patches, some of
> > which have been mentioned already by others. I will point out the rest
> > in direct replies to these patches.
>
> Thanks.
>
> >
> > - MEMFILE_F_UNRECLAIMABLE and MEMFILE_F_UNMOVABLE are never set in
> > this patch series. MFD_INACCESSIBLE only sets
> > MEMFILE_F_USER_INACCESSIBLE. Is this intentional?
>
> It gets set in kvm_private_mem_register() of patch 13, basically those
> flags are expected to be set by architecture code.
>
> >
> > - Nothing in this patch series enforces that MFD_INACCESSIBLE or that
> > any of the MEMFILE_F_* flags are set for the file descriptor to be
> > used as a private_fd. Is this also intentional?
>
> With KVM_MEM_PRIVATE memslot flag, the MEMFILE_F_* are enforced by the
> architecture code.
Right. I was expecting them to be in the mem_fd, but I see now how
they are being set and enforced in patch 13. This makes a lot of sense
now. Thanks!
> >
> > Most of us working on pKVM will be at KVM forum Dublin in September,
> > so it would be great if we could have a chat (and/or beer!) face to
> > face sometime during the conference to help us figure out an
> > upstreamable solution for Android
>
> I would like to, but currently I have no travel plan due to COVID-19 :(
> We can have more online discussions anyway.
Of course! We'll continue this online, and hopefully we will get a
chance to meet in person soon.
Cheers,
/fuad
> Thanks,
> Chao
> >
> > Cheers,
> > /fuad
> >
> > [1] https://lore.kernel.org/all/20220630135747.26983-1-will@kernel.org/
> > [2] https://android-kvm.googlesource.com/linux/+/refs/heads/tabba/fdmem
> > [3] https://lore.kernel.org/all/YkcTTY4YjQs5BRhE@google.com/
> >
> >
> > > Test
> > > ----
> > > To test the new functionalities of this patch TDX patchset is needed.
> > > Since TDX patchset has not been merged so I did two kinds of test:
> > >
> > > - Regresion test on kvm/queue (this patchset)
> > > Most new code are not covered. Code also in below repo:
> > > https://github.com/chao-p/linux/tree/privmem-v7
> > >
> > > - New Funational test on latest TDX code
> > > The patch is rebased to latest TDX code and tested the new
> > > funcationalities. See below repos:
> > > Linux: https://github.com/chao-p/linux/tree/privmem-v7-tdx
> > > QEMU: https://github.com/chao-p/qemu/tree/privmem-v7
> > >
> > > An example QEMU command line for TDX test:
> > > -object tdx-guest,id=tdx,debug=off,sept-ve-disable=off \
> > > -machine confidential-guest-support=tdx \
> > > -object memory-backend-memfd-private,id=ram1,size=${mem} \
> > > -machine memory-backend=ram1
> > >
> > > Changelog
> > > ----------
> > > v7:
> > > - Move the private/shared info from backing store to KVM.
> > > - Introduce F_SEAL_AUTO_ALLOCATE to avoid double allocation.
> > > - Rework on the sync mechanism between zap/page fault paths.
> > > - Addressed other comments in v6.
> > > v6:
> > > - Re-organzied patch for both mm/KVM parts.
> > > - Added flags for memfile_notifier so its consumers can state their
> > > features and memory backing store can check against these flags.
> > > - Put a backing store reference in the memfile_notifier and move pfn_ops
> > > into backing store.
> > > - Only support boot time backing store register.
> > > - Overall KVM part improvement suggested by Sean and some others.
> > > v5:
> > > - Removed userspace visible F_SEAL_INACCESSIBLE, instead using an
> > > in-kernel flag (SHM_F_INACCESSIBLE for shmem). Private fd can only
> > > be created by MFD_INACCESSIBLE.
> > > - Introduced new APIs for backing store to register itself to
> > > memfile_notifier instead of direct function call.
> > > - Added the accounting and restriction for MFD_INACCESSIBLE memory.
> > > - Added KVM API doc for new memslot extensions and man page for the new
> > > MFD_INACCESSIBLE flag.
> > > - Removed the overlap check for mapping the same file+offset into
> > > multiple gfns due to perf consideration, warned in document.
> > > - Addressed other comments in v4.
> > > v4:
> > > - Decoupled the callbacks between KVM/mm from memfd and use new
> > > name 'memfile_notifier'.
> > > - Supported register multiple memslots to the same backing store.
> > > - Added per-memslot pfn_ops instead of per-system.
> > > - Reworked the invalidation part.
> > > - Improved new KVM uAPIs (private memslot extension and memory
> > > error) per Sean's suggestions.
> > > - Addressed many other minor fixes for comments from v3.
> > > v3:
> > > - Added locking protection when calling
> > > invalidate_page_range/fallocate callbacks.
> > > - Changed memslot structure to keep use useraddr for shared memory.
> > > - Re-organized F_SEAL_INACCESSIBLE and MEMFD_OPS.
> > > - Added MFD_INACCESSIBLE flag to force F_SEAL_INACCESSIBLE.
> > > - Commit message improvement.
> > > - Many small fixes for comments from the last version.
> > >
> > > Links to previous discussions
> > > -----------------------------
> > > [1] Original design proposal:
> > > https://lkml.kernel.org/kvm/20210824005248.200037-1-seanjc@google.com/
> > > [2] Updated proposal and RFC patch v1:
> > > https://lkml.kernel.org/linux-fsdevel/20211111141352.26311-1-chao.p.peng@linux.intel.com/
> > > [3] Patch v5: https://lkml.org/lkml/2022/5/19/861
> > >
> > > Chao Peng (12):
> > > mm: Add F_SEAL_AUTO_ALLOCATE seal to memfd
> > > selftests/memfd: Add tests for F_SEAL_AUTO_ALLOCATE
> > > mm: Introduce memfile_notifier
> > > mm/memfd: Introduce MFD_INACCESSIBLE flag
> > > KVM: Rename KVM_PRIVATE_MEM_SLOTS to KVM_INTERNAL_MEM_SLOTS
> > > KVM: Use gfn instead of hva for mmu_notifier_retry
> > > KVM: Rename mmu_notifier_*
> > > KVM: Extend the memslot to support fd-based private memory
> > > KVM: Add KVM_EXIT_MEMORY_FAULT exit
> > > KVM: Register/unregister the guest private memory regions
> > > KVM: Handle page fault for private memory
> > > KVM: Enable and expose KVM_MEM_PRIVATE
> > >
> > > Kirill A. Shutemov (1):
> > > mm/shmem: Support memfile_notifier
> > >
> > > Documentation/virt/kvm/api.rst | 77 +++++-
> > > arch/arm64/kvm/mmu.c | 8 +-
> > > arch/mips/include/asm/kvm_host.h | 2 +-
> > > arch/mips/kvm/mmu.c | 10 +-
> > > arch/powerpc/include/asm/kvm_book3s_64.h | 2 +-
> > > arch/powerpc/kvm/book3s_64_mmu_host.c | 4 +-
> > > arch/powerpc/kvm/book3s_64_mmu_hv.c | 4 +-
> > > arch/powerpc/kvm/book3s_64_mmu_radix.c | 6 +-
> > > arch/powerpc/kvm/book3s_hv_nested.c | 2 +-
> > > arch/powerpc/kvm/book3s_hv_rm_mmu.c | 8 +-
> > > arch/powerpc/kvm/e500_mmu_host.c | 4 +-
> > > arch/riscv/kvm/mmu.c | 4 +-
> > > arch/x86/include/asm/kvm_host.h | 3 +-
> > > arch/x86/kvm/Kconfig | 3 +
> > > arch/x86/kvm/mmu.h | 2 -
> > > arch/x86/kvm/mmu/mmu.c | 74 +++++-
> > > arch/x86/kvm/mmu/mmu_internal.h | 18 ++
> > > arch/x86/kvm/mmu/mmutrace.h | 1 +
> > > arch/x86/kvm/mmu/paging_tmpl.h | 4 +-
> > > arch/x86/kvm/x86.c | 2 +-
> > > include/linux/kvm_host.h | 105 +++++---
> > > include/linux/memfile_notifier.h | 91 +++++++
> > > include/linux/shmem_fs.h | 2 +
> > > include/uapi/linux/fcntl.h | 1 +
> > > include/uapi/linux/kvm.h | 37 +++
> > > include/uapi/linux/memfd.h | 1 +
> > > mm/Kconfig | 4 +
> > > mm/Makefile | 1 +
> > > mm/memfd.c | 18 +-
> > > mm/memfile_notifier.c | 123 ++++++++++
> > > mm/shmem.c | 125 +++++++++-
> > > tools/testing/selftests/memfd/memfd_test.c | 166 +++++++++++++
> > > virt/kvm/Kconfig | 3 +
> > > virt/kvm/kvm_main.c | 272 ++++++++++++++++++---
> > > virt/kvm/pfncache.c | 14 +-
> > > 35 files changed, 1074 insertions(+), 127 deletions(-)
> > > create mode 100644 include/linux/memfile_notifier.h
> > > create mode 100644 mm/memfile_notifier.c
> > >
> > > --
> > > 2.25.1
> > >
next prev parent reply other threads:[~2022-08-31 9:13 UTC|newest]
Thread overview: 172+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-06 8:20 [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory Chao Peng
2022-07-06 8:20 ` [PATCH v7 01/14] mm: Add F_SEAL_AUTO_ALLOCATE seal to memfd Chao Peng
2022-07-21 9:44 ` David Hildenbrand
2022-07-21 9:50 ` David Hildenbrand
2022-07-21 15:05 ` Sean Christopherson
2022-07-25 13:46 ` Chao Peng
2022-07-21 10:27 ` Gupta, Pankaj
2022-07-25 13:54 ` Chao Peng
2022-07-25 14:49 ` Gupta, Pankaj
2022-07-25 13:42 ` Chao Peng
2022-08-05 17:55 ` Paolo Bonzini
2022-08-05 18:06 ` David Hildenbrand
2022-08-10 9:40 ` Chao Peng
2022-08-10 9:38 ` Chao Peng
2022-08-17 23:41 ` Kirill A. Shutemov
2022-08-18 9:09 ` Paolo Bonzini
2022-08-23 7:36 ` David Hildenbrand
2022-08-24 10:20 ` Chao Peng
2022-08-26 15:19 ` Fuad Tabba
2022-08-29 15:18 ` Chao Peng
2022-07-06 8:20 ` [PATCH v7 02/14] selftests/memfd: Add tests for F_SEAL_AUTO_ALLOCATE Chao Peng
2022-08-05 13:11 ` David Hildenbrand
2022-07-06 8:20 ` [PATCH v7 03/14] mm: Introduce memfile_notifier Chao Peng
2022-08-05 13:22 ` David Hildenbrand
2022-08-10 9:22 ` Chao Peng
2022-08-10 10:05 ` David Hildenbrand
2022-08-10 14:38 ` Sean Christopherson
2022-08-11 12:27 ` Quentin Perret
2022-08-11 13:39 ` Chao Peng
2022-07-06 8:20 ` [PATCH v7 04/14] mm/shmem: Support memfile_notifier Chao Peng
2022-07-12 18:02 ` Gupta, Pankaj
2022-07-13 7:44 ` Chao Peng
2022-07-13 10:01 ` Gupta, Pankaj
2022-07-13 23:49 ` Chao Peng
2022-07-14 4:15 ` Gupta, Pankaj
2022-08-05 13:26 ` David Hildenbrand
2022-08-10 9:25 ` Chao Peng
2022-07-06 8:20 ` [PATCH v7 05/14] mm/memfd: Introduce MFD_INACCESSIBLE flag Chao Peng
2022-08-05 13:28 ` David Hildenbrand
2022-08-10 9:37 ` Chao Peng
2022-08-10 9:55 ` David Hildenbrand
2022-08-11 13:17 ` Chao Peng
2022-09-07 16:18 ` Kirill A. Shutemov
2022-07-06 8:20 ` [PATCH v7 06/14] KVM: Rename KVM_PRIVATE_MEM_SLOTS to KVM_INTERNAL_MEM_SLOTS Chao Peng
2022-07-06 8:20 ` [PATCH v7 07/14] KVM: Use gfn instead of hva for mmu_notifier_retry Chao Peng
2022-07-15 11:36 ` Gupta, Pankaj
2022-07-18 13:29 ` Chao Peng
2022-07-18 15:26 ` Sean Christopherson
2022-07-19 14:02 ` Chao Peng
2022-08-04 7:10 ` Isaku Yamahata
2022-08-10 8:19 ` Chao Peng
2022-07-06 8:20 ` [PATCH v7 08/14] KVM: Rename mmu_notifier_* Chao Peng
2022-07-29 19:02 ` Sean Christopherson
2022-08-03 10:13 ` Chao Peng
2022-08-05 19:54 ` Paolo Bonzini
2022-08-10 8:09 ` Chao Peng
2023-05-23 7:19 ` Kautuk Consul
2023-05-23 14:19 ` Sean Christopherson
2023-05-24 6:12 ` Kautuk Consul
2023-05-24 20:16 ` Sean Christopherson
2023-05-24 20:33 ` Peter Zijlstra
2023-05-24 21:39 ` Sean Christopherson
2023-05-25 8:54 ` Peter Zijlstra
2023-05-25 3:52 ` Kautuk Consul
2023-05-24 20:28 ` Peter Zijlstra
2022-07-06 8:20 ` [PATCH v7 09/14] KVM: Extend the memslot to support fd-based private memory Chao Peng
2022-07-29 19:51 ` Sean Christopherson
2022-08-03 10:08 ` Chao Peng
2022-08-03 14:42 ` Sean Christopherson
2022-07-06 8:20 ` [PATCH v7 10/14] KVM: Add KVM_EXIT_MEMORY_FAULT exit Chao Peng
2022-07-06 8:20 ` [PATCH v7 11/14] KVM: Register/unregister the guest private memory regions Chao Peng
2022-07-19 8:00 ` Gupta, Pankaj
2022-07-19 14:08 ` Chao Peng
2022-07-19 14:23 ` Gupta, Pankaj
2022-07-20 15:07 ` Chao Peng
2022-07-20 15:31 ` Gupta, Pankaj
2022-07-20 16:21 ` Sean Christopherson
2022-07-20 17:41 ` Gupta, Pankaj
2022-07-21 7:34 ` Wei Wang
2022-07-21 9:29 ` Chao Peng
2022-07-21 17:58 ` Sean Christopherson
2022-07-25 13:04 ` Chao Peng
2022-07-29 19:54 ` Sean Christopherson
2022-08-02 0:49 ` Sean Christopherson
2022-08-02 16:38 ` Sean Christopherson
2022-08-03 9:48 ` Chao Peng
2022-08-03 15:51 ` Sean Christopherson
2022-08-04 7:58 ` Chao Peng
2022-07-20 16:44 ` Sean Christopherson
2022-07-21 9:37 ` Chao Peng
2022-08-19 19:37 ` Vishal Annapurve
2022-08-24 10:37 ` Chao Peng
2022-08-26 15:19 ` Fuad Tabba
2022-08-29 15:21 ` Chao Peng
2022-07-06 8:20 ` [PATCH v7 12/14] KVM: Handle page fault for private memory Chao Peng
2022-07-29 20:58 ` Sean Christopherson
2022-08-03 9:52 ` Chao Peng
2022-07-06 8:20 ` [PATCH v7 13/14] KVM: Enable and expose KVM_MEM_PRIVATE Chao Peng
2022-07-19 9:55 ` Gupta, Pankaj
2022-07-19 14:12 ` Chao Peng
2022-07-06 8:20 ` [PATCH v7 14/14] memfd_create.2: Describe MFD_INACCESSIBLE flag Chao Peng
2022-08-01 14:40 ` Dave Hansen
2022-08-03 9:53 ` Chao Peng
2022-07-13 3:58 ` [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory Gupta, Pankaj
2022-07-13 7:57 ` Chao Peng
2022-07-13 10:35 ` Gupta, Pankaj
2022-07-13 23:59 ` Chao Peng
2022-07-14 4:39 ` Gupta, Pankaj
2022-07-14 5:06 ` Gupta, Pankaj
2022-07-14 4:29 ` Andy Lutomirski
2022-07-14 5:13 ` Gupta, Pankaj
2022-08-11 10:02 ` Nikunj A. Dadhania
2022-08-11 11:30 ` Gupta, Pankaj
2022-08-11 13:32 ` Chao Peng
2022-08-11 17:28 ` Nikunj A. Dadhania
2022-08-12 3:22 ` Nikunj A. Dadhania
2022-08-11 17:18 ` Nikunj A. Dadhania
2022-08-11 23:02 ` Gupta, Pankaj
2022-08-12 6:02 ` Gupta, Pankaj
2022-08-12 7:18 ` Gupta, Pankaj
2022-08-12 8:48 ` Nikunj A. Dadhania
2022-08-12 9:33 ` Gupta, Pankaj
2022-08-15 13:04 ` Chao Peng
2022-08-16 4:28 ` Nikunj A. Dadhania
2022-08-16 11:33 ` Gupta, Pankaj
2022-08-16 12:24 ` Kirill A . Shutemov
2022-08-16 13:03 ` Gupta, Pankaj
2022-08-16 15:38 ` Sean Christopherson
2022-08-17 15:27 ` Michael Roth
2022-08-23 1:25 ` Isaku Yamahata
2022-08-23 17:41 ` Gupta, Pankaj
2022-08-18 5:40 ` Hugh Dickins
2022-08-18 13:24 ` Kirill A . Shutemov
2022-08-19 0:20 ` Sean Christopherson
2022-08-19 3:38 ` Hugh Dickins
2022-08-19 22:53 ` Sean Christopherson
2022-08-23 7:55 ` David Hildenbrand
2022-08-23 16:05 ` Sean Christopherson
2022-08-24 9:41 ` Chao Peng
2022-09-09 4:55 ` Andy Lutomirski
2022-08-19 3:00 ` Hugh Dickins
2022-08-20 0:27 ` Kirill A. Shutemov
2022-08-21 5:15 ` Hugh Dickins
2022-08-31 14:24 ` Kirill A . Shutemov
2022-09-02 10:27 ` Chao Peng
2022-09-02 12:30 ` Kirill A . Shutemov
2022-09-08 1:10 ` Kirill A. Shutemov
2022-09-13 9:44 ` Sean Christopherson
2022-09-13 13:28 ` Kirill A. Shutemov
2022-09-13 14:53 ` Sean Christopherson
2022-09-13 16:00 ` Kirill A. Shutemov
2022-09-13 16:12 ` Sean Christopherson
2022-09-09 4:48 ` Andy Lutomirski
2022-09-09 14:32 ` Kirill A . Shutemov
2022-09-09 19:11 ` Andy Lutomirski
2022-09-09 23:02 ` Kirill A . Shutemov
2022-08-21 10:27 ` Matthew Wilcox
2022-08-24 10:27 ` Chao Peng
2022-09-09 4:44 ` Andy Lutomirski
[not found] ` <diqzlej60z57.fsf@ackerleytng-cloudtop.c.googlers.com>
[not found] ` <20221202061347.1070246-2-chao.p.peng@linux.intel.com>
2023-04-13 15:25 ` Christian Brauner
2023-04-13 22:28 ` Sean Christopherson
2023-04-14 22:38 ` Ackerley Tng
2023-04-14 23:26 ` Sean Christopherson
2023-04-15 0:06 ` Sean Christopherson
2023-04-19 8:29 ` Christian Brauner
2023-04-20 0:49 ` Sean Christopherson
2023-04-20 8:35 ` Christian Brauner
2022-08-26 15:19 ` Fuad Tabba
2022-08-29 15:17 ` Chao Peng
2022-08-31 9:12 ` Fuad Tabba [this message]
2022-09-02 10:19 ` Chao Peng
2022-09-09 15:35 ` Michael Roth
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='CA+EHjTxgKJ=9UP=DWtNsSgD2FtvBMYrUbcS=9h5j8Tmk57WqxQ@mail.gmail.com' \
--to=tabba@google.com \
--cc=aarcange@redhat.com \
--cc=ak@linux.intel.com \
--cc=akpm@linux-foundation.org \
--cc=bfields@fieldses.org \
--cc=bp@alien8.de \
--cc=chao.p.peng@linux.intel.com \
--cc=corbet@lwn.net \
--cc=dave.hansen@intel.com \
--cc=david@redhat.com \
--cc=ddutile@redhat.com \
--cc=dhildenb@redhat.com \
--cc=hpa@zytor.com \
--cc=hughd@google.com \
--cc=jlayton@kernel.org \
--cc=jmattson@google.com \
--cc=joro@8bytes.org \
--cc=jun.nakajima@intel.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=kvm@vger.kernel.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=luto@kernel.org \
--cc=mail@maciej.szmigiero.name \
--cc=maz@kernel.org \
--cc=mhocko@suse.com \
--cc=michael.roth@amd.com \
--cc=mingo@redhat.com \
--cc=pbonzini@redhat.com \
--cc=qemu-devel@nongnu.org \
--cc=qperret@google.com \
--cc=rppt@kernel.org \
--cc=seanjc@google.com \
--cc=shuah@kernel.org \
--cc=songmuchun@bytedance.com \
--cc=steven.price@arm.com \
--cc=tglx@linutronix.de \
--cc=vannapurve@google.com \
--cc=vbabka@suse.cz \
--cc=vkuznets@redhat.com \
--cc=wanpengli@tencent.com \
--cc=will@kernel.org \
--cc=x86@kernel.org \
--cc=yu.c.zhang@linux.intel.com \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).