From: Jason Gunthorpe <jgg@nvidia.com>
To: Fuad Tabba <tabba@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>,
kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org,
linux-mm@kvack.org, pbonzini@redhat.com, chenhuacai@kernel.org,
mpe@ellerman.id.au, anup@brainfault.org,
paul.walmsley@sifive.com, palmer@dabbelt.com,
aou@eecs.berkeley.edu, seanjc@google.com,
viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org,
akpm@linux-foundation.org, xiaoyao.li@intel.com,
yilun.xu@intel.com, chao.p.peng@linux.intel.com,
jarkko@kernel.org, amoorthy@google.com, dmatlack@google.com,
yu.c.zhang@linux.intel.com, isaku.yamahata@intel.com,
mic@digikod.net, vbabka@suse.cz, vannapurve@google.com,
ackerleytng@google.com, mail@maciej.szmigiero.name,
david@redhat.com, michael.roth@amd.com, wei.w.wang@intel.com,
liam.merwick@oracle.com, isaku.yamahata@gmail.com,
kirill.shutemov@linux.intel.com, suzuki.poulose@arm.com,
steven.price@arm.com, quic_eberman@quicinc.com,
quic_mnalajal@quicinc.com, quic_tsoni@quicinc.com,
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quic_pderrin@quicinc.com, quic_pheragu@quicinc.com,
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yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org,
will@kernel.org, qperret@google.com, keirf@google.com,
roypat@amazon.co.uk, shuah@kernel.org, hch@infradead.org,
rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com,
hughd@google.com, jthoughton@google.com
Subject: Re: [PATCH v3 04/11] KVM: guest_memfd: Allow host to mmap guest_memfd() pages when shared
Date: Thu, 10 Oct 2024 11:37:16 -0300 [thread overview]
Message-ID: <20241010143716.GC3394334@nvidia.com> (raw)
In-Reply-To: <CA+EHjTwEmXcQhCzGJG1icBzHvWEBUVVH33-ng60ngup6LMcC4Q@mail.gmail.com>
On Thu, Oct 10, 2024 at 03:28:38PM +0100, Fuad Tabba wrote:
> I remember discussing this before. One question that I have is, is it
> possible to get a transient pin while the folio lock is held,
No, you can't lock a folio until you refcount it. That is a basic
requirement for any transient pin.
Jason
next prev parent reply other threads:[~2024-10-10 14:37 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-10 8:59 [PATCH v3 00/11] KVM: Restricted mapping of guest_memfd at the host and arm64 support Fuad Tabba
2024-10-10 8:59 ` [PATCH v3 01/11] KVM: guest_memfd: Make guest mem use guest mem inodes instead of anonymous inodes Fuad Tabba
2024-10-12 6:12 ` kernel test robot
2024-10-10 8:59 ` [PATCH v3 02/11] KVM: guest_memfd: Track mappability within a struct kvm_gmem_private Fuad Tabba
2024-10-10 8:59 ` [PATCH v3 03/11] KVM: guest_memfd: Introduce kvm_gmem_get_pfn_locked(), which retains the folio lock Fuad Tabba
2024-10-10 8:59 ` [PATCH v3 04/11] KVM: guest_memfd: Allow host to mmap guest_memfd() pages when shared Fuad Tabba
2024-10-10 10:14 ` Kirill A. Shutemov
2024-10-10 10:23 ` Fuad Tabba
2024-10-10 12:03 ` Jason Gunthorpe
2024-10-10 14:27 ` Fuad Tabba
2024-10-10 12:20 ` Kirill A. Shutemov
2024-10-10 14:28 ` Fuad Tabba
2024-10-10 14:36 ` Kirill A. Shutemov
2024-10-10 14:37 ` Jason Gunthorpe [this message]
2024-10-14 16:52 ` Elliot Berman
2024-10-15 10:27 ` Fuad Tabba
2024-10-16 16:53 ` Elliot Berman
2024-10-10 8:59 ` [PATCH v3 05/11] KVM: guest_memfd: Add guest_memfd support to kvm_(read|/write)_guest_page() Fuad Tabba
2024-10-17 21:53 ` Ackerley Tng
2024-10-18 6:57 ` Patrick Roy
2024-10-10 8:59 ` [PATCH v3 06/11] KVM: guest_memfd: Add KVM capability to check if guest_memfd is host mappable Fuad Tabba
2024-10-15 10:30 ` Suzuki K Poulose
2024-10-15 10:33 ` Fuad Tabba
2024-10-10 8:59 ` [PATCH v3 07/11] KVM: guest_memfd: Add a guest_memfd() flag to initialize it as mappable Fuad Tabba
2024-10-10 8:59 ` [PATCH v3 08/11] KVM: guest_memfd: selftests: guest_memfd mmap() test when mapping is allowed Fuad Tabba
2024-10-10 8:59 ` [PATCH v3 09/11] KVM: arm64: Skip VMA checks for slots without userspace address Fuad Tabba
2024-10-10 8:59 ` [PATCH v3 10/11] KVM: arm64: Handle guest_memfd()-backed guest page faults Fuad Tabba
2024-10-10 8:59 ` [PATCH v3 11/11] KVM: arm64: Enable guest_memfd private memory when pKVM is enabled Fuad Tabba
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