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To:     Borislav Petkov <bp@alien8.de>
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Subject: RE: [Patch v4 01/13] x86/ioapic: Gate decrypted mapping on
 cc_platform_has() attribute
Thread-Topic: [Patch v4 01/13] x86/ioapic: Gate decrypted mapping on
 cc_platform_has() attribute
Thread-Index: AQHZBf6m1tvwNL7mx0Ck5dxxQ1BDw65hREcAgAAIgaCAI5uKgIAASOVg
Date:   Thu, 29 Dec 2022 16:02:28 +0000
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References: <1669951831-4180-1-git-send-email-mikelley@microsoft.com>
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From: Borislav Petkov <bp@alien8.de> Sent: Thursday, December 29, 2022 3:39=
 AM
>=20
> On Tue, Dec 06, 2022 at 07:54:02PM +0000, Michael Kelley (LINUX) wrote:
> > Exactly correct.
>=20
> Ok, thanks.
>=20
> Let's put that in the commit message and get rid of the "subsequent
> patch" wording as patch order in git is ambiguous.
>=20
> IOW, something like this:
>=20
>     Current code always maps the IO-APIC as shared (decrypted) in a
>     confidential VM. But Hyper-V guest VMs on AMD SEV-SNP with vTOM enabl=
ed
>     use a paravisor running in VMPL0 to emulate the IO-APIC.
>=20
>     In such a case, the IO-APIC must be accessed as private (encrypted)
>     because the paravisor emulates the IO-APIC in the lower half of the v=
TOM
>     where all accesses must be encrypted.
>=20
>     Add a new CC attribute which determines how the IO-APIC MMIO mapping
>     should be established depending on the platform the kernel is running=
 on
>     as a guest.
>
=20
Works for me.  I'll adopt this wording in v5.

Michael