lkml.org 
[lkml]   [2022]   [Mar]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCHv5.1 01/30] x86/tdx: Detect running as a TDX guest in early boot
On Tue, Mar 08, 2022 at 01:24:56AM +0300, Kirill A. Shutemov wrote:
> From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
>
> In preparation of extending cc_platform_has() API to support TDX guest,
> use CPUID instruction to detect support for TDX guests in the early
> boot code (via tdx_early_init()). Since copy_bootdata() is the first
> user of cc_platform_has() API, detect the TDX guest status before it.
>
> Define a synthetic feature flag (X86_FEATURE_TDX_GUEST) and set this
> bit in a valid TDX guest platform.
>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
> Reviewed-by: Andi Kleen <ak@linux.intel.com>
> Reviewed-by: Tony Luck <tony.luck@intel.com>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
> ---
> v5.1:
> - Drop BUILD_BUG_ON()
> ---
> arch/x86/Kconfig | 12 ++++++++++++
> arch/x86/coco/Makefile | 2 ++
> arch/x86/coco/tdx.c | 22 ++++++++++++++++++++++
> arch/x86/include/asm/cpufeatures.h | 1 +
> arch/x86/include/asm/disabled-features.h | 8 +++++++-
> arch/x86/include/asm/tdx.h | 21 +++++++++++++++++++++
> arch/x86/kernel/head64.c | 4 ++++
> 7 files changed, 69 insertions(+), 1 deletion(-)
> create mode 100644 arch/x86/coco/tdx.c
> create mode 100644 arch/x86/include/asm/tdx.h

I don't know how many versions of this patch I've reviewed by now. Oh
well, finally:

Reviewed-by: Borislav Petkov <bp@suse.de>

:-)

--
Regards/Gruss,
Boris.

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

\
 
 \ /
  Last update: 2022-03-09 19:23    [W:0.068 / U:22.240 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site