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AJvYcCWA7Z0ddIIaU2Rjnw30gYej5e9MbRFReugNNktBwoyVc7KpQp+cgj67rUBot8t2xLIBibN6Rbd+jw==@kvack.org X-Gm-Message-State: AOJu0YziFPU5kPJok4pvuom9gBMklJFlw9Emk4lEPd9QrFGLk5+y4ZNH 5a5LhO+aO2miuI5wtgbIEfiGpLHUYkm/HUKzKeL9ABV3X1dI8z9C/wT/4G9KjV3ETks02pcLYuh 5xJuHVQ== X-Received: from pgix2.prod.google.com ([2002:a63:db42:0:b0:c6d:cc16:8cee]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:6e8a:b0:38d:f2a1:a43f with SMTP id adf61e73a8af0-39854a814d6mr239546637.42.1772730783352; Thu, 05 Mar 2026 09:13:03 -0800 (PST) Date: Thu, 5 Mar 2026 09:08:27 -0800 In-Reply-To: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.53.0.473.g4a7958ca14-goog Message-ID: <177272511649.1531226.15957182226632150956.b4-ty@google.com> Subject: Re: [PATCH v2 0/2] Test MADV_COLLAPSE on guest_memfd From: Sean Christopherson To: Sean Christopherson , kartikey406@gmail.com, pbonzini@redhat.com, shuah@kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, Ackerley Tng Cc: vannapurve@google.com, Liam.Howlett@oracle.com, akpm@linux-foundation.org, baohua@kernel.org, baolin.wang@linux.alibaba.com, david@kernel.org, dev.jain@arm.com, i@maskray.me, lance.yang@linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, lorenzo.stoakes@oracle.com, npache@redhat.com, ryan.roberts@arm.com, shy828301@gmail.com, stable@vger.kernel.org, syzbot+33a04338019ac7e43a44@syzkaller.appspotmail.com, ziy@nvidia.com Content-Type: text/plain; charset="utf-8" X-Rspamd-Queue-Id: C3E3540011 X-Stat-Signature: 53zfrgjtix7x9ixsto4mscb8fcxeudgf X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1772730784-15648 X-HE-Meta: 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 iR+JJKEp 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 20 Feb 2026 23:54:34 +0000, Ackerley Tng wrote: > syzkaller identified that khugepaged, operating on guest_memfd memory, > could cause guest_memfd folios to get collapsed, leading to a WARNing > during fault [1]. > > Add selftest to guard against similar regressions. > > Changes in v2: > > [...] Applied to kvm-x86 selftests, thanks! [1/2] KVM: selftests: Wrap madvise() to assert success https://github.com/kvm-x86/linux/commit/58f5d8eebd5c [2/2] KVM: selftests: Test MADV_COLLAPSE on guest_memfd https://github.com/kvm-x86/linux/commit/9830209b4ae8 -- https://github.com/kvm-x86/linux/tree/next