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a="59099907" X-IronPort-AV: E=Sophos;i="6.16,328,1744095600"; d="scan'208";a="59099907" X-CSE-ConnectionGUID: 8a5hHC3SSAu4jFbWBdZkww== X-CSE-MsgGUID: cWPg/EDpRnyXw88jogLF3A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,328,1744095600"; d="scan'208";a="158067516" From: Xiaoyao Li To: David Hildenbrand , Igor Mammedov , Paolo Bonzini Cc: qemu-devel@nongnu.org, Xiaoyao Li , Stefano Garzarella Subject: [PATCH] hostmem/shm: Allow shm memory backend serve as shared memory for coco-VMs Date: Mon, 21 Jul 2025 14:52:20 +0800 Message-ID: <20250721065220.895606-1-xiaoyao.li@intel.com> X-Mailer: git-send-email 2.43.0 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=192.198.163.12; envelope-from=xiaoyao.li@intel.com; helo=mgamail.intel.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.088, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HK_RANDOM_ENVFROM=0.001, HK_RANDOM_FROM=0.999, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, SPF_HELO_NONE=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 @intel.com) X-ZM-MESSAGEID: 1753081322825116600 Content-Type: text/plain; charset="utf-8" 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 Signed-off-by: Xiaoyao Li Acked-by: David Hildenbrand Acked-by: Stefano Garzarella --- backends/hostmem-shm.c | 1 + 1 file changed, 1 insertion(+) diff --git a/backends/hostmem-shm.c b/backends/hostmem-shm.c index f66211a2ec92..806e2670e039 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 2.43.0