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a="30753963" X-IronPort-AV: E=Sophos;i="6.09,235,1716274800"; d="scan'208";a="30753963" X-CSE-ConnectionGUID: BmOnfm53TROM4l4nb2FKiw== X-CSE-MsgGUID: 1Cs7+M5qSK6v2R8gqF5zBQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,235,1716274800"; d="scan'208";a="52858161" From: Chenyi Qiang To: Paolo Bonzini , David Hildenbrand , Peter Xu , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Michael Roth Cc: Chenyi Qiang , qemu-devel@nongnu.org, kvm@vger.kernel.org, Williams Dan J , Edgecombe Rick P , Wang Wei W , Peng Chao P , Gao Chao , Wu Hao , Xu Yilun Subject: [RFC PATCH 3/6] KVM: Notify the state change via RamDiscardManager helper during shared/private conversion Date: Thu, 25 Jul 2024 03:21:12 -0400 Message-ID: <20240725072118.358923-4-chenyi.qiang@intel.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20240725072118.358923-1-chenyi.qiang@intel.com> References: <20240725072118.358923-1-chenyi.qiang@intel.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=198.175.65.13; envelope-from=chenyi.qiang@intel.com; helo=mgamail.intel.com X-Spam_score_int: -44 X-Spam_score: -4.5 X-Spam_bar: ---- X-Spam_report: (-4.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.136, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, 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: 1721892273572116600 Content-Type: text/plain; charset="utf-8" Once exit to userspace to convert the page from private to shared or vice versa at runtime, notify the state change via the guest_memfd_state_change() helper so that other registered subsystems like VFIO can be notified. Signed-off-by: Chenyi Qiang --- accel/kvm/kvm-all.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index 854cb86b22..94bbbbd2de 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -48,6 +48,7 @@ #include "kvm-cpus.h" #include "sysemu/dirtylimit.h" #include "qemu/range.h" +#include "sysemu/guest-memfd-manager.h" =20 #include "hw/boards.h" #include "sysemu/stats.h" @@ -2852,6 +2853,7 @@ int kvm_convert_memory(hwaddr start, hwaddr size, boo= l to_private) RAMBlock *rb; void *addr; int ret =3D -1; + GuestMemfdManager *gmm; =20 trace_kvm_convert_memory(start, size, to_private ? "shared_to_private"= : "private_to_shared"); =20 @@ -2914,6 +2916,11 @@ int kvm_convert_memory(hwaddr start, hwaddr size, bo= ol to_private) addr =3D memory_region_get_ram_ptr(mr) + section.offset_within_region; rb =3D qemu_ram_block_from_host(addr, false, &offset); =20 + gmm =3D GUEST_MEMFD_MANAGER(mr->rdm); + if (gmm) { + guest_memfd_state_change(gmm, offset, size, to_private); + } + if (to_private) { if (rb->page_size !=3D qemu_real_host_page_size()) { /* --=20 2.43.5