linux-kernel - Re: [PATCH v2 2/2] x86/sev: let sev_es_efi_map

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Message-ID: <20250625124016.GCaFvuMA9oApInTVyI@fat_crate.local>
Date: Wed, 25 Jun 2025 14:40:16 +0200
From: Borislav Petkov <bp@...en8.de>
To: Gerd Hoffmann <kraxel@...hat.com>
Cc: linux-coco@...ts.linux.dev, kvm@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
	"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <linux-kernel@...r.kernel.org>,
	"open list:EXTENSIBLE FIRMWARE INTERFACE (EFI)" <linux-efi@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] x86/sev: let sev_es_efi_map_ghcbs map the caa
 pages too

On Wed, Jun 25, 2025 at 01:52:58PM +0200, Gerd Hoffmann wrote:
> The kernel allocates the caa page(s) only when running under svsm, see
> alloc_runtime_data(), so this is not correct.  I think we either have to
> return to the original behavior of only doing something in case address
> is not NULL

Yes, we're doing something only when the address is not NULL.

Or maybe I'm missing what you're trying to tell me...

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette