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Peter Anvin" To: Brijesh Singh , Thomas Gleixner , x86@kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-coco@lists.linux.dev, linux-mm@kvack.org CC: brijesh.singh@amd.com, Ingo Molnar , Joerg Roedel , Tom Lendacky , Ard Biesheuvel , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Jim Mattson , Andy Lutomirski , Dave Hansen , Sergio Lopez , Peter Gonda , Peter Zijlstra , Srinivas Pandruvada , David Rientjes , Dov Murik , Tobin Feldman-Fitzthum , Borislav Petkov , Michael Roth , Vlastimil Babka , "Kirill A . Shutemov" , Andi Kleen , "Dr . David Alan Gilbert" , brijesh.ksingh@gmail.com, tony.luck@intel.com, marcorr@google.com, sathyanarayanan.kuppuswamy@linux.intel.com Subject: =?US-ASCII?Q?Re=3A_=5BPATCH_v12_29/46=5D_x86/boot=3A_Add_Co?= =?US-ASCII?Q?nfidential_Computing_type_to_setup=5Fdata?= User-Agent: K-9 Mail for Android In-Reply-To: <91ed3c18-6cff-c6d4-a628-81f1f71b21dc@amd.com> References: <20220307213356.2797205-1-brijesh.singh@amd.com> <20220307213356.2797205-30-brijesh.singh@amd.com> <87v8vlzz8x.ffs@tglx> <91ed3c18-6cff-c6d4-a628-81f1f71b21dc@amd.com> Message-ID: <496A3732-C91B-48B0-9DBB-126108174D93@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1658034971; a=rsa-sha256; cv=none; b=ZgVoX5ucXopu10HP/c6/+59L0maQpGUGHBJ3Ftp7/21WKzg/m1ZlKK7eB/fTnVUliOiZj9 ck+4iEw71sZcCwLLxsfzg4+ZAAr3TR2FF3G6YGiB9KYl/sL1lC/+qC5qODLoe6MRkyLSfT lYlTE5msy+NIpcy825tm8Ei9LnuWOyc= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=zytor.com header.s=2022070501 header.b=x9NX+33N; spf=pass (imf09.hostedemail.com: domain of hpa@zytor.com designates 198.137.202.136 as permitted sender) smtp.mailfrom=hpa@zytor.com; dmarc=pass (policy=none) header.from=zytor.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1658034971; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=2oBoSTWNfbYjfQp5I53ct47lO8uP5kHvPPZlw0O0iT4=; b=TsKNirjqIZZquqj41BGo0493Kl+lqhYzi4EuLkoq/64TOovnZFNPjsmJTvxnhc9Le2Q8Xl 4zj0VS/nfM7ZySsEjoNqiLbtJieCO0WzQq5GbymD0bRxqL/LTw9PEZ8LXrrvrLk+jbnaP6 d4iJ1nbOKBokKBPLVQOGtLuQPtcnhYM= X-Rspamd-Queue-Id: 1B176140045 Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=zytor.com header.s=2022070501 header.b=x9NX+33N; spf=pass (imf09.hostedemail.com: domain of hpa@zytor.com designates 198.137.202.136 as permitted sender) smtp.mailfrom=hpa@zytor.com; dmarc=pass (policy=none) header.from=zytor.com X-Rspamd-Server: rspam05 X-Rspam-User: X-Stat-Signature: tgs5jkjatph9fsct3faxi6a9mgyf5thu X-HE-Tag: 1658034970-223548 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On April 7, 2022 7:57:22 AM PDT, Brijesh Singh = wrote: > > >On 4/6/22 16:19, Thomas Gleixner wrote: >> On Mon, Mar 07 2022 at 15:33, Brijesh Singh wrote: >>> =20 >>> +/* >>> + * AMD SEV Confidential computing blob structure=2E The structure is >>> + * defined in OVMF UEFI firmware header: >>> + * https://github=2Ecom/tianocore/edk2/blob/master/OvmfPkg/Include/Gu= id/ConfidentialComputingSevSnpBlob=2Eh >>> + */ >>> +#define CC_BLOB_SEV_HDR_MAGIC 0x45444d41 >>> +struct cc_blob_sev_info { >>> + u32 magic; >>> + u16 version; >>> + u16 reserved; >>> + u64 secrets_phys; >>> + u32 secrets_len; >>> + u32 rsvd1; >>> + u64 cpuid_phys; >>> + u32 cpuid_len; >>> + u32 rsvd2; >>> +}; >>=20 >> Shouldn't this be packed? >>=20 > >Yep, to avoid any additional compiler alignment we should pack it=2E > >thanks It shouldn't be *necessary*, any more than it is necessary for kernel-user= space structures, since EFI is a C-based ABI=2E On x86 it doesn't hurt, ei= ther, though, so might as well=2E