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a="86429765" X-IronPort-AV: E=Sophos;i="6.18,290,1751266800"; d="scan'208";a="86429765" X-CSE-ConnectionGUID: 9W6FRImfQLGlotGUhkwuSw== X-CSE-MsgGUID: 9IxeGwi8TVqbn1KSSo8qbg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.18,290,1751266800"; d="scan'208";a="180975701" From: Zhenzhong Duan To: qemu-devel@nongnu.org Cc: alex.williamson@redhat.com, clg@redhat.com, eric.auger@redhat.com, joao.m.martins@oracle.com, Zhenzhong Duan Subject: [PATCH 0/2] Optimize unmap_all with one ioctl() Date: Wed, 24 Sep 2025 03:02:52 -0400 Message-ID: <20250924070254.1550014-1-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.47.1 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=192.198.163.7; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -47 X-Spam_score: -4.8 X-Spam_bar: ---- X-Spam_report: (-4.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.442, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_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: 1758697479503116600 Content-Type: text/plain; charset="utf-8" Currently unmap_all is split into two ioctl() with each unmap half of the whole iova space. IOMMUFD supports unmap_all ioctl() from beginning, after kernel commit c19650995374 ("vfio/type1: implement unmap all") added same support for VFIO type1, the split becomes unnecessary. So optimize the code to only do one ioctl() to unmap_all for both backends. Test: In order to trigger unmap_all request, made below trick, during emergency reset in guest, memory region [0xfef00000 - 0xffffffffffffffff] is deleted, I fake it to be a unmap_all request. --- a/hw/vfio/listener.c +++ b/hw/vfio/listener.c @@ -714,8 +714,10 @@ static void vfio_listener_region_del(MemoryListener *l= istener, if (try_unmap) { bool unmap_all =3D false; - if (int128_eq(llsize, int128_2_64())) { + if (int128_eq(llsize, int128_2_64()) || + iova =3D=3D 0xfef00000) { unmap_all =3D true; + iova =3D 0; llsize =3D int128_zero(); } The log shows ioctl() succeed on the whole iova space: vfio_listener_region_del region_del 0xfef00000 - 0xffffffffffffffff iommufd_backend_unmap_dma iommufd=3D10 ioas=3D5 iova=3D0x0 size=3D0xffffff= ffffffffff (0) Same result for legacy VFIO. Maybe it's easy to trigger unmap_all with other arch, e.g., arm smmu, but f= or x86, iommu memory region is split by iommu_ir, unmap_all isn't triggered. Thanks Zhenzhong Zhenzhong Duan (2): vfio/container: Support unmap all in one ioctl() vfio/iommufd: Support unmap all in one ioctl() hw/vfio/container.c | 33 ++++++++++++++++++++------------- hw/vfio/iommufd.c | 16 ++-------------- 2 files changed, 22 insertions(+), 27 deletions(-) --=20 2.47.1