From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lamorak.hansenpartnership.com (lamorak.hansenpartnership.com [198.37.111.173]) (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 EA88B2DB7A3; Wed, 17 Jun 2026 13:45:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.37.111.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781703952; cv=none; b=ad5C21rz+XDik/P3XlhmD4iLRP+VCVc+QgkJfKgDcaQPUlQgxZR23/4/pfi8D7PcrglNjqSrbpkH074jydhg7Gzz7Wpq1+CGabo2uY3wbwrhGtlf7IP2VSxEQB7Pf7xiRGnxD5Mqlke6Dc/Jpw+LJI2DqzUZkcQKpev8u9rZ/fY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781703952; c=relaxed/simple; bh=GHbpxhI4ZgYxcZb8FC0vm3p/f6kLT6E2UkZVwM3g9Nk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; 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Joerg Roedel , Jethro Beekman Date: Wed, 17 Jun 2026 09:45:46 -0400 In-Reply-To: References: <20260611123528.572255-1-joro@8bytes.org> <20260611123528.572255-5-joro@8bytes.org> <64383a438eb79a30588f2737a6df84f9d4cd5b7d.camel@HansenPartnership.com> Autocrypt: addr=James.Bottomley@HansenPartnership.com; 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AHBLpBdnl9SOe8ETkv6GqbZrXUED/dAbRVIT5vHP51zyYB8rAUjp3PnzxsXFG8eQaacEyKSl0DKDlgKuQ+k292LVGJhEva8z4cwg3JcrQWzbpTRskQRP624aQ7t0LKbNfXqfYT13TvZNTDdjQaCJRJ3EG8uXOszVKuc0guXunZPmmq6x1Y3bOfOezcFYoywwL3nKef+Z5sQrjG3/5NLeu+W Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2026-06-17 at 15:28 +0200, J=C3=B6rg R=C3=B6del wrote: > Hi James, >=20 > On Wed, Jun 17, 2026 at 09:18:14AM -0400, James Bottomley wrote: > > That's true for the launch measure, but you do have a vTPM inside > > the SVSM which you could use to measure an updated GHCB if we could > > decide on a PCR to use (and a logging specification). >=20 > I guess you mean an updated VMSA? The guest-created VMSAs are trusted > because they are created by trusted code from within the TEE. There > is no need to runtime-measure their content, no? Well if the guest policy is I don't care how many CPUs you give me then certainly, yes. However, if the guest does care, they may want an attestable record of it somewhere. Since clouds do charge somewhat per-vCPU I can see this mattering to some tenants. Regards, James