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Mon, 03 Nov 2025 13:06:50 -0800 (PST) X-Google-Smtp-Source: AGHT+IF4FVW6RmePVO3C5tM6InWV0y++MuBOKCQ+vy5A3bBe6vz2AWjfnLcS9mHcPd9Vju8nmW1ruw== X-Received: by 2002:a05:620a:3724:b0:8a2:db64:2f13 with SMTP id af79cd13be357-8ab9afd2fcdmr1723623085a.55.1762204009936; Mon, 03 Nov 2025 13:06:49 -0800 (PST) From: Peter Xu To: qemu-devel@nongnu.org Cc: Fabiano Rosas , David Hildenbrand , peterx@redhat.com, Paolo Bonzini , Xiaoyao Li , Stefano Garzarella , qemu-stable Subject: [PULL 15/36] hostmem/shm: Allow shm memory backend serve as shared memory for coco-VMs Date: Mon, 3 Nov 2025 16:06:04 -0500 Message-ID: <20251103210625.3689448-16-peterx@redhat.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20251103210625.3689448-1-peterx@redhat.com> References: <20251103210625.3689448-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1762204199218154101 Content-Type: text/plain; charset="utf-8" From: Xiaoyao Li shm can surely serve as the shared memory for coco-VMs. But currently it doesn't check the backend->guest_memfd to pass down the RAM_GUEST_MEMFD flag. It leads to failure when creating coco-VMs (e.g., TDX guest) which require private mmeory. Set and pass down RAM_GUEST_MEMFD when backend->guest_memfd is true, to allow shm memory backend serve as shared memory for coco-VMs. Cc: Stefano Garzarella Cc: qemu-stable Signed-off-by: Xiaoyao Li Acked-by: David Hildenbrand Acked-by: Stefano Garzarella Link: https://lore.kernel.org/r/20250721065220.895606-1-xiaoyao.li@intel.com Signed-off-by: Peter Xu --- backends/hostmem-shm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/backends/hostmem-shm.c b/backends/hostmem-shm.c index f66211a2ec..806e2670e0 100644 --- a/backends/hostmem-shm.c +++ b/backends/hostmem-shm.c @@ -54,6 +54,7 @@ have_fd: /* Let's do the same as memory-backend-ram,share=3Don would do. */ ram_flags =3D RAM_SHARED; ram_flags |=3D backend->reserve ? 0 : RAM_NORESERVE; + ram_flags |=3D backend->guest_memfd ? RAM_GUEST_MEMFD : 0; =20 return memory_region_init_ram_from_fd(&backend->mr, OBJECT(backend), backend_name, backend->size, --=20 2.50.1