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Tue, 22 Sep 2026 10:26:45 -0700 (PDT) Received: from ziepe.ca ([130.41.10.202]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-81603fc79dcsm103564a34.14.2026.09.22.10.26.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 22 Sep 2026 10:26:44 -0700 (PDT) Received: from jgg by wakko with local (Exim 4.97) (envelope-from ) id 1x93id-0000000AWlt-1Oeu; Tue, 22 Sep 2026 13:51:47 -0300 Date: Tue, 22 Sep 2026 13:51:47 -0300 From: Jason Gunthorpe To: Catalin Marinas Cc: "Aneesh Kumar K.V (Arm)" , linux-coco@lists.linux.dev, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, Andrew Morton , christian.koenig@amd.com, Joerg Roedel , Marc Zyngier , Marek Szyprowski , Robin Murphy , Steven Price , Sumit Semwal , Suzuki K Poulose , Thomas Gleixner , Will Deacon , dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-media@vger.kernel.org, linux-mm@kvack.org Subject: Re: [RFC PATCH v7 02/13] mm: Add an allocator for CoCo shared memory Message-ID: <20260922165147.GD1540250@ziepe.ca> References: <20260921144847.501151-1-aneesh.kumar@kernel.org> <20260921144847.501151-3-aneesh.kumar@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 53538C0006 X-Rspam-User: X-Stat-Signature: z6jgae1nbqa3i8i1rc3k8w33m38ssc7o X-HE-Tag: 1790098006-252928 X-HE-Meta: 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 An3zSPsN fWbQ1PWoWmzaaBB2l8fkKq9C38DaUoZ3SitmxdxQXG3VjkLiYGniYF6MlMeExnwWpYanlVmsHCIE6xdRpIwznE8W/RGf8nZHGyu/I1o6OqgnvTBojJd2rX0swtWQNjDiIzSAfrUU1NkksVKrbBo30pq4IpETfQZRRMusZrAcZdx6jjX3uZzVq00sFzsRknqP+CjMI3XvxgMz1UuCCTgCCxh6RcEOnG+IqGLhDgp9wRaOnA5QMJOD4CPQ0QwYRzfNmDj/fzBMEeuTtUPBDpVijya9FP0lKAhTBte05 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Sep 22, 2026 at 05:25:58PM +0100, Catalin Marinas wrote: > Does the memset() post sharing logic work for pKVM as well? If nothing > clears it, we have a small window where guest data is leaked to the > host. Same question for RMM? Or did they define that the RMM zeros on these transitions? Jason