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charset="utf-8" Message-Id: <20261022-gmem-alternative-providers-v2-39-5dd1dc6c660a@google.com> References: <20261022-gmem-alternative-providers-v2-0-5dd1dc6c660a@google.com> In-Reply-To: <20261022-gmem-alternative-providers-v2-0-5dd1dc6c660a@google.com> To: Alex Williamson , Alexander Graf , Alexander Viro , Alexey Kardashevskiy , Andrew Morton , "Aneesh Kumar K.V" , Ashish Kalra , Baolin Wang , Baolu Lu , Bill Wendling , Borislav Petkov , Catalin Marinas , Christian Brauner , =?utf-8?q?Christian_K=C3=B6nig?= , Connor Williamson , Dave Hansen , Dave Jiang , David Hildenbrand , David Rientjes , David Woodhouse , Erdem Aktas , Frank van der Linden , Fred Griffoul , Fred Griffoul , Gregory Price , "H. Peter Anvin" , Hugh Dickins , Ingo Molnar , Jacob Pan , James Houghton , Jan Kara , Jason Gunthorpe , Jianxiong Gao , Joerg Roedel , Joey Gouly , John Starks , Jonathan Corbet , Justin Stitt , Kevin Tian , Lorenzo Stoakes , Marc Zyngier , Michael Roth , Mike Rapoport , Nathan Chancellor , Nick Desaulniers , Nicolin Chen , Oliver Upton , Paolo Bonzini , Pratyush Yadav , Randy Dunlap , Robin Murphy , Samiullah Khawaja , Sean Christopherson , Shuah Khan , Steffen Eiden , Steven Price , Suzuki K Poulose , Tarun Sahu , Thomas Gleixner , Tom Lendacky , Tycho Andersen , Vishal Annapurve , Vlastimil Babka , Will Deacon , Xu Yilun , Yan Zhao , Zenghui Yu , x86@kernel.org, Shuah Khan , Fuad Tabba Cc: kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, Ackerley Tng X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=ed25519-sha256; t=1792711665; l=1330; i=ackerleytng@google.com; s=20260225; h=from:subject:message-id; bh=NdiG9FPDlnNbsz2ib8/wlciF0KncQRew07nTG0ctD40=; b=CDdMamphZIbmfallZAf+zAlCSwYwHQvFF250PUqCiYstDOGo3XzHcZzpxt2LRa0pH1AMCoBPE zaP+413XJ8UCDzIJFydqCEK46oLrN7zsYHXw7ptoxdrrTrAK4IvEU59 X-Developer-Key: i=ackerleytng@google.com; a=ed25519; pk=sAZDYXdm6Iz8FHitpHeFlCMXwabodTm7p8/3/8xUxuU= X-Endpoint-Received: by B4 Relay for ackerleytng@google.com/20260225 with auth_id=649 X-Original-From: Ackerley Tng Reply-To: ackerleytng@google.com Content-Transfer-Encoding: 7bit From: Ackerley Tng In folio mode, folios truncated on inode destruction are reclaimed via aops->free_folio (kvm_gmem_free_folio), calling kvm_arch_gmem_reclaim() to reset hardware confidential VM state (e.g. SEV-SNP RMP entries). In PFN mode, memory is not backed by page cache folios, so kvm_gmem_free_folio() is never invoked. Do the reclaim during kvm_gmem_destroy_inode() when in PFN mode across the entire file range, ensuring that any confidential architecture state on provider PFNs is reclaimed before releasing the provider. Signed-off-by: Ackerley Tng --- virt/kvm/guest_memfd.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index 0819c3653e88a..88eae9d6d249f 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -1643,6 +1643,13 @@ static void kvm_gmem_destroy_inode(struct inode *inode) { struct gmem_inode *gi = GMEM_I(inode); + /* + * Skip if the provider was not yet set up, as iput() can reach this on + * error paths before provider_ops is initialized. + */ + if (gi->provider_ops && kvm_gmem_is_pfn_mode(gi)) + kvm_gmem_pfn_reclaim(gi, 0, i_size_read(inode) >> PAGE_SHIFT); + gmem_provider_release(gi); mpol_free_shared_policy(&gi->policy); -- 2.56.0.257.gf7497c7d27-goog