From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B249C2DC35F for ; Fri, 17 Oct 2025 23:33:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760744024; cv=none; b=LwspJtFjsTPkK83dlyr0CxC3P/CUzz8t7cA0aAzmYhZ346SSF3wTAgZA3A7d0I1IxI4WGd1u9DlGv7aK0Tv8IdY4REw6m9S7RBm9fT+NgsSMSy/u0X6nRgtFtFPmRkSPQR5u/AbW7wAsqEYkWUr59LpBWXwktytuDqlNH3fs7L8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760744024; c=relaxed/simple; bh=O4poxL3uV+mMir/NtnbsQIIOJ7Lzn0S5rcHjXTbpNqI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=cBVJocpb0rqUNVqy6azNiz4yZ8vH4M6bEFER4j3XDdOvbc4UMQM8CXw+QT1vEfP5SzEt1fwFuREdqr+4VBaH3Ww2VBshSf52Tt5RKnG1Gx5kIPqUczNMZEQ+Pycy6DPYgGPQuvqBaFi/KTkaiUIGdSxuysbo482oxtwRCpVp8U0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--ackerleytng.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=HBbgnEg6; arc=none smtp.client-ip=209.85.216.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--ackerleytng.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="HBbgnEg6" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-336b646768eso2796760a91.1 for ; Fri, 17 Oct 2025 16:33:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1760744020; x=1761348820; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=LwfPpMJqaisEQVUu9wiIDJQK1raYpWFG3P+DdjsMb18=; b=HBbgnEg6RbTmkM0oHDhclWTglR9/RcvlluitBHJlbWV+6iQLqgU3Jax56TCvgjYTEd IER/G2+2FrtFGXFQSxYiwfG1MF3ty65zfiCKQlgHYEbod7W5kAVd68VNoamcycl2HeaM bj454Ytv83+xSufqfkEo039p5LLoCFYihXQ27Qwh0KFDqAylAzAhzdsDcbGosHkW/2qy n6LKmJRHok2Bu+LaOFqzEYNNKYZSrgLJJABXzjVeNJYflK1KArnj03ujkACwJ9m/euoA WsENt9WdJxyNlSmhdryHCrUDJCXgn90qiy2HjAWUGCovXjN97hT3ZMfVQVbvh76uxLXc /Tzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1760744020; x=1761348820; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=LwfPpMJqaisEQVUu9wiIDJQK1raYpWFG3P+DdjsMb18=; b=DhSl8LHMeQjVaKh71Ap6ahsB0kj9ET01HiUCS0axb3Nk/49JXI2s6gli3dI91jOqaY mAMYGsOvrdoZ0CDB5V+NQkAGSIUk9GcDY7oeUK5J5KJLG3UaQ6Ap8rscYHoskgn7opQ/ wr14hYmoOUEausTOboHLX4YYoSc5T9J8Y4gtaL9aiV+OCV7leDulI3uVcmJiacS6mu87 EDnLjknS7kbkp2yzqHonzADe6F+NYbXiKbGtYA3RgBIJD78u3eIx2wRrC1+h1yMgtocU KxVZGqKmUdwZQE/MJka6V341NI9hxxD8vFYkueZKty10BSK5IBDoQAD5CQweNW6p5+xf Nmjw== X-Forwarded-Encrypted: i=1; AJvYcCVlLGEhqEjgWzUdmfbDrIq/U+famyE3VLLushRstm/VOMyv+AmoFaRQ9FEfhqG4eYklIHD4NoWQGNVPcUiT3bI=@vger.kernel.org X-Gm-Message-State: AOJu0YxxHKf5Lic7wbjgUKSGOGlCaj0nVTWrBZadGIrmKFCEOHJM1yu0 Lsr6EEYN5StOlZ0JnSmKJOiNKUnjpwsl08P1b/GAYXSP8OTh2QIvwFDTSuXqCGNOmxIrQvF3Yoa b1RsCr0i4xzYHYu+OTGm8/Xpjkw== X-Google-Smtp-Source: AGHT+IEJkm1Y/xUQeOW9OSrw7fOIA8LhUvRSTlkRcfM+UNWeMSJmrld0H6KUJsXbTWNmxyDTB1XySSWqNmUDg7YYhA== X-Received: from pjtn11.prod.google.com ([2002:a17:90a:c68b:b0:32b:8eda:24e8]) (user=ackerleytng job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:1d88:b0:32b:df0e:9283 with SMTP id 98e67ed59e1d1-33bcf90e86cmr6755629a91.34.1760744020326; Fri, 17 Oct 2025 16:33:40 -0700 (PDT) Date: Fri, 17 Oct 2025 16:33:38 -0700 In-Reply-To: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: Message-ID: Subject: Re: [RFC PATCH v1 26/37] KVM: selftests: guest_memfd: Test that shared/private status is consistent across processes From: Ackerley Tng To: cgroups@vger.kernel.org, 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, linux-trace-kernel@vger.kernel.org, x86@kernel.org Cc: akpm@linux-foundation.org, binbin.wu@linux.intel.com, bp@alien8.de, brauner@kernel.org, chao.p.peng@intel.com, chenhuacai@kernel.org, corbet@lwn.net, dave.hansen@intel.com, dave.hansen@linux.intel.com, david@redhat.com, dmatlack@google.com, erdemaktas@google.com, fan.du@intel.com, fvdl@google.com, haibo1.xu@intel.com, hannes@cmpxchg.org, hch@infradead.org, hpa@zytor.com, hughd@google.com, ira.weiny@intel.com, isaku.yamahata@intel.com, jack@suse.cz, james.morse@arm.com, jarkko@kernel.org, jgg@ziepe.ca, jgowans@amazon.com, jhubbard@nvidia.com, jroedel@suse.de, jthoughton@google.com, jun.miao@intel.com, kai.huang@intel.com, keirf@google.com, kent.overstreet@linux.dev, liam.merwick@oracle.com, maciej.wieczor-retman@intel.com, mail@maciej.szmigiero.name, maobibo@loongson.cn, mathieu.desnoyers@efficios.com, maz@kernel.org, mhiramat@kernel.org, mhocko@kernel.org, mic@digikod.net, michael.roth@amd.com, mingo@redhat.com, mlevitsk@redhat.com, mpe@ellerman.id.au, muchun.song@linux.dev, nikunj@amd.com, nsaenz@amazon.es, oliver.upton@linux.dev, palmer@dabbelt.com, pankaj.gupta@amd.com, paul.walmsley@sifive.com, pbonzini@redhat.com, peterx@redhat.com, pgonda@google.com, prsampat@amd.com, pvorel@suse.cz, qperret@google.com, richard.weiyang@gmail.com, rick.p.edgecombe@intel.com, rientjes@google.com, rostedt@goodmis.org, roypat@amazon.co.uk, rppt@kernel.org, seanjc@google.com, shakeel.butt@linux.dev, shuah@kernel.org, steven.price@arm.com, steven.sistare@oracle.com, suzuki.poulose@arm.com, tabba@google.com, tglx@linutronix.de, thomas.lendacky@amd.com, vannapurve@google.com, vbabka@suse.cz, viro@zeniv.linux.org.uk, vkuznets@redhat.com, wei.w.wang@intel.com, will@kernel.org, willy@infradead.org, wyihan@google.com, xiaoyao.li@intel.com, yan.y.zhao@intel.com, yilun.xu@intel.com, yuzenghui@huawei.com, zhiquan1.li@intel.com Content-Type: text/plain; charset="UTF-8" Ackerley Tng writes: > From: Sean Christopherson > > Add a test to verify that a guest_memfd's shared/private status is > consistent across processes. > Missed copying Sean's note from [1]. Rephrased: Test that on shared to private conversion, any shared pages previously mapped in any process are unmapped from all processes. [1] https://lore.kernel.org/all/aN7U1ewx8dNOKl1n@google.com/ > The test forks a child process after creating the shared guest_memfd > region so that the second process exists alongside the main process for the > entire test. > > The processes then take turns to access memory to check that the > shared/private status is consistent across processes. > > Signed-off-by: Sean Christopherson > Co-developed-by: Ackerley Tng > Signed-off-by: Ackerley Tng > --- > .../kvm/guest_memfd_conversions_test.c | 74 +++++++++++++++++++ > 1 file changed, 74 insertions(+) > > > [...snip...] >