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[130.88.198.135]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45da0fe2464sm55387740f8f.32.2026.05.20.07.19.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 May 2026 07:19:37 -0700 (PDT) From: Joshua Lant To: linux-cxl@vger.kernel.org Cc: jic23@kernel.org, Joshua Lant Subject: [QEMU PATCH 0/2] cxl: fixes for hot-removal of devices Date: Wed, 20 May 2026 15:16:46 +0100 Message-ID: <20260520141816.3240010-2-joshualant@gmail.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit As requested from the discussion in: https://lore.kernel.org/linux-cxl/20260429135717.3048713-1-joshualant@gmail.com/T/#t Two bugs have been found when testing cxl topologies for managed hot-remove of a device: Patch 1 properly unmaps the backend memory device, allowing it to be remapped if the removed device is re-added. Patch 2 sets the power controller present capability in the downstream port. This is required to notify the device from the guest of removal. Modifications from linked RFC (patches 3 & 4): - Originally patch 3 (1 here) unmaps only on exit. It should also unmap in the error goto in the realize function. - "Fixes:" tags added to commit messages. Joshua Lant (2): cxl-type3: Properly unmap the memory-backend on device exit cxl_downstream: enable power controller present capability. hw/mem/cxl_type3.c | 6 ++++++ hw/pci-bridge/cxl_downstream.c | 2 ++ 2 files changed, 8 insertions(+) -- 2.47.3