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[2003:d8:2f1b:b800:6fdb:1af2:4fbd:1fdf]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a4efe5b7b0sm21754128f8f.10.2025.06.04.05.25.28 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Jun 2025 05:25:30 -0700 (PDT) Message-ID: Date: Wed, 4 Jun 2025 14:25:27 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 09/16] KVM: guest_memfd: Track shared memory support in memslot To: Fuad Tabba , kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org Cc: 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, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, 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, quic_svaddagi@quicinc.com, quic_cvanscha@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, catalin.marinas@arm.com, james.morse@arm.com, 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, jgg@nvidia.com, rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com, hughd@google.com, jthoughton@google.com, peterx@redhat.com, pankaj.gupta@amd.com, ira.weiny@intel.com References: <20250527180245.1413463-1-tabba@google.com> <20250527180245.1413463-10-tabba@google.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 253A380003 X-Stat-Signature: dbniu77mm89ney7psfycogpy7z3ypwcm X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1749039935-756825 X-HE-Meta: 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 UPoR6NVz 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 27.05.25 20:02, Fuad Tabba wrote: > Track whether a guest_memfd-backed memslot supports shared memory within > the memslot itself, using the flags field. The top half of memslot flags > is reserved for internal use in KVM. Add a flag there to track shared > memory support. > > This saves the caller from having to check the guest_memfd-backed file > for this support, a potentially more expensive operation due to the need > to get/put the file. > > Suggested-by: David Hildenbrand > Signed-off-by: Fuad Tabba > --- > include/linux/kvm_host.h | 11 ++++++++++- > virt/kvm/guest_memfd.c | 8 ++++++-- > 2 files changed, 16 insertions(+), 3 deletions(-) > > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > index ba83547e62b0..edb3795a64b9 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -54,7 +54,8 @@ > * used in kvm, other bits are visible for userspace which are defined in > * include/uapi/linux/kvm.h. > */ > -#define KVM_MEMSLOT_INVALID (1UL << 16) > +#define KVM_MEMSLOT_INVALID (1UL << 16) > +#define KVM_MEMSLOT_SUPPORTS_SHARED (1UL << 17) Should there be a "GMEM" in there? -- Cheers, David / dhildenb