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bh=RfKyB3gUAqSG9wFlu0Z7cbVS/JqR/5j8rNgFaP0cEJw=; b=Ii6lRoMbGM/ZCKY7n0TL28n0xlxn+CwafTrCs67mL65i2h4aYKCDF2A/BOuaAaj4lqzPBD HZNA5b46oNJsECffoO/4eASOi23MbUIXupc7DJ8JCxuq2LxG95bS9qa5NguuJOYpqDvyh/ 72sBGvKev9cXJRWDaSEU0LrKF2Y5Jf0= X-MC-Unique: qdD2Q4iBNzW9w6STYXwIAg-1 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH 2/3] memory: add memory_region_is_mapped_shared() Date: Mon, 22 Feb 2021 16:10:16 +0000 Message-Id: <20210222161017.570837-3-stefanha@redhat.com> In-Reply-To: <20210222161017.570837-1-stefanha@redhat.com> References: <20210222161017.570837-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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=216.205.24.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 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, MIME_BASE64_TEXT=1.741, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, Laurent Vivier , Thomas Huth , "Michael S. Tsirkin" , Stefan Hajnoczi , Paolo Bonzini , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Add a function to query whether a memory region is mmap(MAP_SHARED). This will be used to check that vhost-user memory regions can be shared with the device backend process in the next patch. An inline function in "exec/memory.h" would have been nice but RAMBlock fields are only accessible from memory.c (see "exec/ramblock.h"). Signed-off-by: Stefan Hajnoczi --- include/exec/memory.h | 11 +++++++++++ softmmu/memory.c | 6 ++++++ 2 files changed, 17 insertions(+) diff --git a/include/exec/memory.h b/include/exec/memory.h index c6fb714e49..7b7dbe9fd0 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -2457,6 +2457,17 @@ static inline bool memory_access_is_direct(MemoryReg= ion *mr, bool is_write) } } =20 +/** + * memory_region_is_mapped_shared: check whether a memory region is + * mmap(MAP_SHARED) + * + * Returns %true is a memory region is mmap(MAP_SHARED). This is always fa= lse + * on memory regions that do not support memory_region_get_ram_ptr(). + * + * @mr: the memory region being queried + */ +bool memory_region_is_mapped_shared(MemoryRegion *mr); + /** * address_space_read: read from an address space. * diff --git a/softmmu/memory.c b/softmmu/memory.c index 874a8fccde..e6631e5d4c 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -1809,6 +1809,12 @@ bool memory_region_is_ram_device(MemoryRegion *mr) return mr->ram_device; } =20 +bool memory_region_is_mapped_shared(MemoryRegion *mr) +{ + return memory_access_is_direct(mr, false) && + (mr->ram_block->flags & RAM_SHARED); +} + uint8_t memory_region_get_dirty_log_mask(MemoryRegion *mr) { uint8_t mask =3D mr->dirty_log_mask; --=20 2.29.2