Re: [PATCH v2 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa pages too

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To: Borislav Petkov <bp@xxxxxxxxx>
Subject: Re: [PATCH v2 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa pages too
From: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Date: Thu, 26 Jun 2025 09:43:15 +0200
Cc: linux-coco@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <linux-kernel@xxxxxxxxxxxxxxx>, "open list:EXTENSIBLE FIRMWARE INTERFACE (EFI)" <linux-efi@xxxxxxxxxxxxxxx>
In-reply-to: <20250625142644.GEaFwHJHFO2gbSN3GJ@fat_crate.local>
References: <20250602105050.1535272-1-kraxel@redhat.com> <20250602105050.1535272-3-kraxel@redhat.com> <20250624130158.GIaFqhxjE8-lQqq7mt@fat_crate.local> <rite3te5udzekwbbujmga5kyyjjm5gfphhqoxlhtsncgckq6rm@7m7owl5jgubz> <20250625124016.GCaFvuMA9oApInTVyI@fat_crate.local> <4kk67edghl7wvqzuyubgr45mhols37yqsorbxxvkypm3xwnuvc@2oek5mladprs> <20250625142644.GEaFwHJHFO2gbSN3GJ@fat_crate.local>

On Wed, Jun 25, 2025 at 04:29:36PM +0200, Borislav Petkov wrote:
> On Wed, Jun 25, 2025 at 03:21:47PM +0200, Gerd Hoffmann wrote:
> > This is inside a loop, so returning in case the caa address is NULL will
> > skip ghcb setup for all but the first CPU.
> 
> Then you should not piggyback on this loop but map the CAs in a separate step,
> only when a SVSM is running.

v3 sent.

take care,
  Gerd

References:
- [PATCH v2 0/2] x86/sev: improve efi runtime code support.
  - From: Gerd Hoffmann
- [PATCH v2 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa pages too
  - From: Gerd Hoffmann
- Re: [PATCH v2 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa pages too
  - From: Borislav Petkov
- Re: [PATCH v2 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa pages too
  - From: Gerd Hoffmann
- Re: [PATCH v2 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa pages too
  - From: Borislav Petkov
- Re: [PATCH v2 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa pages too
  - From: Gerd Hoffmann
- Re: [PATCH v2 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa pages too
  - From: Borislav Petkov

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