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Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li Subject: [PATCH v5 0/9] mshv: add SEV-SNP support for MSHV root partitions Date: Tue, 8 Sep 2026 12:13:33 +0000 Message-ID: <20260908121403.1160280-1-weh@linux.microsoft.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260831112704.2851147-1-weh@linux.microsoft.com> References: <20260831112704.2851147-1-weh@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series adds support for creating and managing AMD SEV-SNP confidential virtual machines through the Microsoft Hypervisor root partition driver. The series adds fixed-size MSHV UAPI definitions, the required Microsoft Hypervisor ABI definitions and hypercall helpers, partition ioctls, capability discovery, processor-feature handling, ordered encrypted-memory teardown, and nested-root SynIC handling. Two prerequisite fixes lead the series. The first makes memory-region unmap ownership explicit and retains mappings, pinned pages, the partition, and the module whenever checked hypervisor unmap cannot prove cleanup. The second publishes and withdraws per-CPU SynIC pointers so interrupt readers cannot observe mappings after initialization failure or CPU teardown. Testing: - Built all four affected x86 MSHV objects with W=1 at every commit. - Built the complete x86_64 kernel and modules with W=1. - Built the affected ARM64 objects with W=1. - Ran scripts/checkpatch.pl --strict on every patch. - Verified installed UAPI layouts in 64-bit and 32-bit userspace builds. - Generated rust-vmm MSHV bindings from the installed kernel headers. - Passed all 8 KUnit host-access tests on a separate test-only branch. - Passed the corrected single-CVM runtime test. - Booted a four-vCPU SEV-SNP guest to login. The development host needs two additional local runtime patches to boot as a nested MSHV root partition: EFI HvLoader root-partition boot enablement and the non-upstreamable nested-VMBus interrupt-vector workaround. Neither patch, the KUnit follow-up, nor any runtime-only commit is part of this nine-patch series. Changes since v4: - Separate faults_blocked admission state from mapping_may_exist proof in patch 1. The interval notifier no longer takes the fair rwsem, always publishes its interval sequence after taking the region mutex, and a movable fault drops all attempt-local locks before retry. This removes the v4 ABBA cycle while preserving checked-unmap proof requirements. - Correct patch 5's commit message to describe the isolated-page import and import-completion wrappers actually added by that patch. - Replace patch 6's region-wide host-access boolean with per-page READ, WRITE, EXCLUSIVE, and UNCERTAIN state and exact completed-prefix updates. Recovery restores only the known completed prefix; teardown restores only nonbaseline state and retains uncertain pages. - Make MAKE_EXCLUSIVE and MAKE_SHARED explicit ownership transitions. Permission-only operations preserve ownership, and the child partition ID is supplied only for MAKE_EXCLUSIVE. Support arbitrary cross-region arrays, reject duplicate GPA/PFN entries and pinned aliases, and restore PSP request pages to their exact original state. - The first v5 runtime iteration exposed an incorrect forced MAKE_SHARED and child partition_id model. The corrected wire/state matrix passed the single-CVM runtime test and a four-vCPU guest boot to login. - Leave two findings that predate this series unchanged and explicitly out of scope: MMIO VMA/PFN validation and the blockable notifier remap-failure contract. The reported L1VH local-SIRBP path is also pre-existing and is unreachable for the hardware-CVM partition type exercised here. Link: https://lore.kernel.org/linux-hyperv/20260831112704.2851147-1-weh@linux.microsoft.com/ Wei Hu (3): mshv: retain memory regions until unmap succeeds mshv: clear SynIC mappings before freeing them mshv: set up own SynIC registers on a nested root partition Wei Liu (6): mshv: add SEV-SNP UAPI definitions mshv: add SEV-SNP PSP request hypercall mshv: add SEV-SNP isolated page hypercalls mshv: wire SEV-SNP partition ioctls mshv: detect and report SEV-SNP support at init mshv: use safe partition CPU feature defaults drivers/hv/mshv_regions.c | 510 ++++++++++--- drivers/hv/mshv_root.h | 120 ++- drivers/hv/mshv_root_hv_call.c | 369 ++++++++-- drivers/hv/mshv_root_main.c | 1267 ++++++++++++++++++++++++++++++-- drivers/hv/mshv_synic.c | 172 +++-- include/hyperv/hvgdk_mini.h | 31 + include/hyperv/hvhdk.h | 124 +++- include/hyperv/hvhdk_mini.h | 53 ++ include/uapi/linux/mshv.h | 111 ++- 9 files changed, 2452 insertions(+), 305 deletions(-) base-commit: be0cfab740e58b70047ef6e7e3d578f00ed5d258 -- 2.43.0