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Date: Tue, 15 Mar 2022 14:48:30 +0100
From: "Gerd Hoffmann" <kraxel@redhat.com>
To: Min Xu <min.m.xu@intel.com>
Cc: devel@edk2.groups.io, Michael D Kinney <michael.d.kinney@intel.com>,
	Brijesh Singh <brijesh.singh@amd.com>,
	Erdem Aktas <erdemaktas@google.com>,
	James Bottomley <jejb@linux.ibm.com>,
	Jiewen Yao <jiewen.yao@intel.com>,
	Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: [PATCH V5 08/10] OvmfPkg/IncompatiblePciDeviceSupportDxe: Ignore OptionRom in Td guest
Message-ID: <20220315134830.uz7iay6onjdd232o@sirius.home.kraxel.org>
References: <20220313004111.388-1-min.m.xu@intel.com>
 <20220313004111.388-9-min.m.xu@intel.com>
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On Sun, Mar 13, 2022 at 08:41:09AM +0800, Min Xu wrote:
> RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429
> 
> Host VMM may inject OptionRom which is untrusted in Td guest. So PCI
> OptionRom needs to be ignored if it is Td guest. According to
> "Table 20. ACPI 2.0 & 3.0 QWORD Address Space Descriptor Usage"
> PI spec 1.7, type-specific flags can be set to 0 when Address
> Translation Offset == 6 to skip device option ROM.
> 
> Cc: Michael D Kinney <michael.d.kinney@intel.com>
> Cc: Brijesh Singh <brijesh.singh@amd.com>
> Cc: Erdem Aktas <erdemaktas@google.com>
> Cc: James Bottomley <jejb@linux.ibm.com>
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Cc: Tom Lendacky <thomas.lendacky@amd.com>
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Signed-off-by: Min Xu <min.m.xu@intel.com>

Acked-by: Gerd Hoffmann <kraxel@redhat.com>