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bh=4lvnwCtrPDnXyVmehzwWHmW4+Ppw0puxVjxFyVwmVZY=; b=UB7PliO3mFmSqsJus22+QhfTVJn+IRlMLDe3CjjboBMzX9VTQ5tAxfAR9gwNUY51WilQu6 /gRsjcHOJBd1Zkub8Yg1cRoi4vMXkgCxrZ22vtEgtlpH+nFQGJN/pLPQYpXuG8NCdSM6K3 WG1kwtYtjwF+1rcTHYqRMuxnj/zfZFQ= X-MC-Unique: 1aUZcpzmPpiYIJpPxhonnw-1 From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Xiaoyao Li , David Hildenbrand , Michael Roth Subject: [PULL 54/63] physmem: Introduce ram_block_discard_guest_memfd_range() Date: Tue, 23 Apr 2024 17:09:42 +0200 Message-ID: <20240423150951.41600-55-pbonzini@redhat.com> In-Reply-To: <20240423150951.41600-1-pbonzini@redhat.com> References: <20240423150951.41600-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.4 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=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.67, 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_H4=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: 2.1.29 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: 1713885091435100003 Content-Type: text/plain; charset="utf-8" From: Xiaoyao Li When memory page is converted from private to shared, the original private memory is back'ed by guest_memfd. Introduce ram_block_discard_guest_memfd_range() for discarding memory in guest_memfd. Based on a patch by Isaku Yamahata . Signed-off-by: Xiaoyao Li Reviewed-by: David Hildenbrand Signed-off-by: Michael Roth Message-ID: <20240320083945.991426-12-michael.roth@amd.com> Signed-off-by: Paolo Bonzini --- include/exec/cpu-common.h | 2 ++ system/physmem.c | 23 +++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h index 6346df17ce9..6d5318895a3 100644 --- a/include/exec/cpu-common.h +++ b/include/exec/cpu-common.h @@ -159,6 +159,8 @@ typedef int (RAMBlockIterFunc)(RAMBlock *rb, void *opaq= ue); =20 int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque); int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length); +int ram_block_discard_guest_memfd_range(RAMBlock *rb, uint64_t start, + size_t length); =20 #endif =20 diff --git a/system/physmem.c b/system/physmem.c index 5ebcf5be116..c3d04ca9212 100644 --- a/system/physmem.c +++ b/system/physmem.c @@ -3721,6 +3721,29 @@ err: return ret; } =20 +int ram_block_discard_guest_memfd_range(RAMBlock *rb, uint64_t start, + size_t length) +{ + int ret =3D -1; + +#ifdef CONFIG_FALLOCATE_PUNCH_HOLE + ret =3D fallocate(rb->guest_memfd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KE= EP_SIZE, + start, length); + + if (ret) { + ret =3D -errno; + error_report("%s: Failed to fallocate %s:%" PRIx64 " +%zx (%d)", + __func__, rb->idstr, start, length, ret); + } +#else + ret =3D -ENOSYS; + error_report("%s: fallocate not available %s:%" PRIx64 " +%zx (%d)", + __func__, rb->idstr, start, length, ret); +#endif + + return ret; +} + bool ramblock_is_pmem(RAMBlock *rb) { return rb->flags & RAM_PMEM; --=20 2.44.0