Messages in this thread | | | Date | Wed, 9 Mar 2022 19:22:02 +0100 | From | Borislav Petkov <> | Subject | Re: [PATCHv5.1 01/30] x86/tdx: Detect running as a TDX guest in early boot |
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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
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