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 0B83D390CA9; Wed, 17 Jun 2026 13:18:15 +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=1781702297; cv=none; b=b5jrI/Dd7EQ9EAahSCt92K3I9yQYqyl9sddbMlvB4wrHRTZ62rQ0xfP+iBB2BFaXujhL4wmszBgaRdtkkBP0hhIEXTjOUW6IHXuN4l9ClAbxKJcJkuHqsYStys0CLIZ6TEy6N31vd/HIvFSEWUvbZAyUYxE4bTs5CuUtOnOMEr0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781702297; c=relaxed/simple; bh=U/rU7D/ikoOzDlOPp5TrwZtyG9qh6ASCOQ5bNp6zfSo=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=iT/3zmeY3q017o/px6D+ZFXcghzVcFp5igPf1jyzNjmqMrpmL28QLYAKaN4z70pNnwA6XEdA49DoWhwbKf8vWx/dRaWXo8LhbQLMkQ8J8Ti5ElA2o5i+nkPJWxGPUS5eY9KAFt6ly61Q8DIiCxdFlwizeUj4ur4KIx6ZDAjHU4w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com; spf=pass smtp.mailfrom=HansenPartnership.com; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b=hXm62Kp5; arc=none smtp.client-ip=198.37.111.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="hXm62Kp5" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1781702295; bh=U/rU7D/ikoOzDlOPp5TrwZtyG9qh6ASCOQ5bNp6zfSo=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References:From; b=hXm62Kp5HhZE7AKAmCjQkMprAsgZ/AK2fnXdWFjWKpB1laINwoAin8ZcieiLQdBN3 /1xHLyOyFs+EGPKeyy4j97pqALqTp0a5pivK4GX+DmBQgVnODr83CsTpSx1Ewl/7rI tx+ZxIUuqN7qFM0GinCmSzTrSsvdrKXgm6Akbedk= Received: from lingrow.int.hansenpartnership.com (unknown [IPv6:2601:5c4:4300:d341::8c71]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lamorak.hansenpartnership.com (Postfix) with ESMTPSA id C292B1C028C; Wed, 17 Jun 2026 09:18:14 -0400 (EDT) Message-ID: <64383a438eb79a30588f2737a6df84f9d4cd5b7d.camel@HansenPartnership.com> Subject: Re: [PATCH 4/4] kvm: svm: Support KVM_SEV_SNP_PAGE_TYPE_VMSA at SNP_LAUNCH_UPDATE From: James Bottomley To: =?ISO-8859-1?Q?J=F6rg_R=F6del?= , Sean Christopherson Cc: Paolo Bonzini , x86@kernel.org, Tom Lendacky , Michael Roth , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, coconut-svsm@lists.linux.dev, Joerg Roedel , Jethro Beekman Date: Wed, 17 Jun 2026 09:18:14 -0400 In-Reply-To: References: <20260611123528.572255-1-joro@8bytes.org> <20260611123528.572255-5-joro@8bytes.org> Autocrypt: addr=James.Bottomley@HansenPartnership.com; keydata=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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 08:45 +0200, J=C3=B6rg R=C3=B6del wrote: > On Tue, Jun 16, 2026 at 10:55:28AM -0700, Sean Christopherson wrote: > > Isn't this essentially the same thing as hot-plugging vCPUs after > > launch?=C2=A0 I have yet to review it in depth (sorry Jethro), but it > > looks a *lot* simpler. >=20 > Replacing the VMSA after launch (as supported with the AP_CREATE GHCB > call) is different because this has no influence on the launch > measurement. 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). Regards, James