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From: "Gerd Hoffmann" <kraxel@redhat.com>
To: "Xu, Min M" <min.m.xu@intel.com>
Cc: "devel@edk2.groups.io" <devel@edk2.groups.io>,
	Anthony Perard <anthony.perard@citrix.com>,
	Ard Biesheuvel <ardb+tianocore@kernel.org>,
	Brijesh Singh <brijesh.singh@amd.com>,
	"Aktas, Erdem" <erdemaktas@google.com>,
	James Bottomley <jejb@linux.ibm.com>,
	"Yao, Jiewen" <jiewen.yao@intel.com>,
	"Justen, Jordan L" <jordan.l.justen@intel.com>,
	Julien Grall <julien@xen.org>, Laszlo Ersek <lersek@redhat.com>,
	Peter Grehan <grehan@freebsd.org>,
	Rebecca Cran <rebecca@bsdio.com>,
	"Boeuf, Sebastien" <sebastien.boeuf@intel.com>,
	Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: [PATCH V1 1/1] OvmfPkg/IntelTdxX64: Raise DXEFV size to 13MB
Date: Fri, 6 Jan 2023 07:48:01 +0100	[thread overview]
Message-ID: <20230106064801.wklkbaorb35wc2pj@sirius.home.kraxel.org> (raw)
In-Reply-To: <PH0SPR01MB0012DAA69B333F9FA4711FC2C5FB9@PH0SPR01MB0012.namprd11.prod.outlook.com>

On Fri, Jan 06, 2023 at 12:49:21AM +0000, Xu, Min M wrote:
> On January 5, 2023 7:32 PM, Gerd Hoffmann wrote:
> > 
> > On Thu, Jan 05, 2023 at 03:21:05PM +0800, Min Xu wrote:
> > > From: Min M Xu <min.m.xu@intel.com>
> > >
> > > BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4236
> > >
> > > Similarly to the "cadence" mentioned in commit d272449 ("OvmfPkg:
> > > raise DXEFV size to 11 MB", 2018-05-29), it's been ~1.75 years since
> > > commit 5e75c4d ("OvmfPkg: raise DXEFV size to 12 MB", 2020-03-11), and
> > > we've outgrown DXEFV again (with NOOPT builds).  Increase the DXEFV
> > > size of IntelTdxX64 to 13MB now.
> > 
> > Not sure this makes sense given that you want split DXEFV into two smaller
> > volumes for IntelTdx (patch series sent in december IIRC).
> > 
> Thanks Gerd for the comments.
> I think raising DXEFV size and split DXEFV into 2 FVs are for different purpose and they're not conflicted.
> 
> The purpose of raising DXEFV size is to enlarge the FV so that more drivers can be hosted.
> 
> The purpose of splitting DXEFV are:
> 1) Reduce the attack surface in CC guest.
> 2) Improve boot perf in CC guest.

This also makes DXEFV smaller to make room for the new Firmware Volume.
So you change DXEFV size twice in a row.  I would avoid that and just
pick reasonable sizes for both volumes in the split patch series
instead.

take care,
  Gerd


      reply	other threads:[~2023-01-06  6:48 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-05  7:21 [PATCH V1 1/1] OvmfPkg/IntelTdxX64: Raise DXEFV size to 13MB Min Xu
2023-01-05 11:31 ` Gerd Hoffmann
2023-01-05 16:28   ` Laszlo Ersek
2023-01-06  6:40     ` Gerd Hoffmann
2023-01-06  0:49   ` Min Xu
2023-01-06  6:48     ` Gerd Hoffmann [this message]

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