From: "Gerd Hoffmann" <kraxel@redhat.com>
To: "West, Catharine" <catharine.west@intel.com>
Cc: "Xu, Min M" <min.m.xu@intel.com>,
"devel@edk2.groups.io" <devel@edk2.groups.io>,
"Ni, Ray" <ray.ni@intel.com>,
"Wu, MingliangX" <mingliangx.wu@intel.com>,
"Yao, Jiewen" <jiewen.yao@intel.com>,
"Xue, Shengfeng" <xueshengfeng@byosoft.com.cn>,
"Dong, Eric" <eric.dong@intel.com>,
"Kumar, Rahul R" <rahul.r.kumar@intel.com>,
"De, Debkumar" <debkumar.de@intel.com>
Subject: Re: [edk2-devel] [PATCH V1 1/1] UefiCpuPkg/ResetVector: Cache Disable should not be set by default in CR0
Date: Thu, 18 Jan 2024 16:46:13 +0100 [thread overview]
Message-ID: <iat7urnhdfjbs4z5msw3flhmxz2altbe6piixqv2av43xj3ayf@v56pxdihr3lk> (raw)
In-Reply-To: <SN7PR11MB7591D19E5BF0096ABDF4AB9A9B692@SN7PR11MB7591.namprd11.prod.outlook.com>
On Wed, Jan 10, 2024 at 04:43:47PM +0000, West, Catharine wrote:
> Disabling cache by default results in violation of BTG protections (if BTG enabled).
>
> BIOS cannot assume that cache is disabled before it executes as ACM may be required to enable NEM.
>
> Whatever solution needs to be done here cannot evict ACM-enabled NEM.
Well, it's OVMF in a virtual machine. No boot guard involved.
So we could probably go for a OVMF-specific patch here.
But I'd prefer to figure what exactly is happening here before going
down that route. An extreme slowdown just because we flip that bit
doesn't make sense to me.
> Why is boot time increasing?
Not clear. It seems to be the lzma uncompress of the firmware volume
in rom / pflash which is very slow. Also it is apparently only
triggered in case pci device assignment is used.
take care,
Gerd
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next prev parent reply other threads:[~2024-01-18 15:46 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-26 9:47 [edk2-devel] [PATCH V1 1/1] UefiCpuPkg/ResetVector: Cache Disable should not be set by default in CR0 xueshengfeng via groups.io
2023-07-26 9:55 ` Ni, Ray
[not found] ` <177562550EF0534C.27380@groups.io>
2023-08-03 8:14 ` Ni, Ray
2024-01-10 7:51 ` Min Xu
2024-01-10 16:43 ` West, Catharine
2024-01-18 15:46 ` Gerd Hoffmann [this message]
2024-01-22 19:11 ` Brian J. Johnson
2024-01-23 5:01 ` Min Xu
2024-01-23 10:52 ` Gerd Hoffmann
2024-01-23 14:13 ` Laszlo Ersek
2024-01-23 16:11 ` Gerd Hoffmann
2024-01-24 3:06 ` Min Xu
2024-01-24 12:49 ` Laszlo Ersek
2024-01-24 13:26 ` Gerd Hoffmann
2024-01-24 14:45 ` Laszlo Ersek
2024-01-24 17:11 ` Gerd Hoffmann
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