From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A30940D58B; Thu, 20 Aug 2026 11:13:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787224422; cv=none; b=g6QTS5M1mdALBSTqYGRDYt0Gx9gXRhFSqjome4dj7XveXN3S6MLSLlrjmW3qYfCASy5czzRP6WkywcG97kbOAdUorRixc3LsdS+LyYWLIcZbXwxr5xTLgN6Vm6bZ0/+OJHfxVbUxRVwlamkvwxvpmO8yNV+SIXomYBuvijrdMk0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787224422; c=relaxed/simple; bh=KtI5T5Ka930wbyhgmgqkQ4FepflWZdHZnI8uHPdT3NQ=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=Q+fNiJRGcWSzRH6cLi4QQEDcvB7ga0djLb8Cxivmu7q8LbJnHq6wBzrzvGtT+oEIekb3JAJKZMH2CC6NhKoaX8f7tcI8Ep3KkvqBu/GNT1pj6cGphbehW6e5SuLbAA5vRpbo0Bfq3qOe8iwr3yzn9+HCZgDf0G3FkS3LJrtR+wM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gSYNUhgr; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gSYNUhgr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0C551F000E9; Thu, 20 Aug 2026 11:13:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787224421; bh=bi8kks1t9xNKvGVo/6jcNJzZIGuN6UX788iT+MOzMzA=; h=From:To:Cc:Subject:In-Reply-To:References:Date; b=gSYNUhgrqzk238wabITHC7PbgxskdNvBkQ8ykYb8gYbi3wBC4TZl4R6bUTv8izpKV kqPIwwiZtspW6BlEqv9a1P6ZZARrkSzP2n3GzchQVb+zyzQj6Z7WEDwBOpZvQz6unT Dzmz2+vGr8Pk1MWkENMwDieuYaxT+Ut/6cU3hKMJtUqnxBa0f/9OzdEL2xdJQ0dfw7 w2dOUqXtFFOaQ4ddtKCaFbMV4Ezvz4kSRNOxfeCwyW1bbN98aLSSf4n99HPepvs7nY MvLV78GOznFSvpsIgXQhNbqzNIIwav8ngBFYVuC8aMBhbKESKLXTkbVjG1IFxqJukA 8DWpK7rnYR4eQ== X-Mailer: emacs 30.2 (via feedmail 11-beta-1 I) From: Aneesh Kumar K.V To: Kameron Carr , linux-coco@lists.linux.dev, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Alexey Kardashevskiy , Catalin Marinas , Dan Williams , Jason Gunthorpe , Jonathan Cameron , Marc Zyngier , Samuel Ortiz , Steven Price , Suzuki K Poulose , Will Deacon , Xu Yilun Subject: Re: [RFC PATCH v4 07/11] coco: guest: arm64: Add guest APIs to read host-cached DA objects In-Reply-To: <36877aa6-3f70-4da1-aecb-7209a33f8595@linux.microsoft.com> References: <20260427082805.931832-1-aneesh.kumar@kernel.org> <20260427082805.931832-8-aneesh.kumar@kernel.org> <36877aa6-3f70-4da1-aecb-7209a33f8595@linux.microsoft.com> Date: Thu, 20 Aug 2026 16:43:29 +0530 Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain Kameron Carr writes: >> diff --git a/drivers/virt/coco/arm-cca-guest/rsi-da.h b/drivers/virt/coco/arm-cca-guest/rsi-da.h >> index 297cb800edc0..88067d2230ab 100644 >> --- a/drivers/virt/coco/arm-cca-guest/rsi-da.h >> +++ b/drivers/virt/coco/arm-cca-guest/rsi-da.h >> @@ -10,6 +10,8 @@ >> #include >> #include >> >> +#define MAX_CACHE_OBJ_SIZE SZ_16M > > Why is the limit 16 MiB? I don't see that limitation in the RHI spec. > Does the limit come from PCI TSM? > I based that on the SPDM MeasurementRecordLength, which is 16 MB. -aneesh