diff options
| author |   Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> | 2022-04-06 02:29:10 +0300 |
|---|---|---|
| committer |   Dave Hansen <dave.hansen@linux.intel.com> | 2022-04-07 08:27:50 -0700 |
| commit | 59bd54a84d15e9335de5b8abe7b3b9713a36b99b (patch) | |
| tree | 092fe681be97bfa61b235a9b494114a881180ab0 /kernel/fail_function.c | |
| parent | Linux 5.18-rc1 (diff) | |
| download | linux-rng-59bd54a84d15e9335de5b8abe7b3b9713a36b99b.tar.xz linux-rng-59bd54a84d15e9335de5b8abe7b3b9713a36b99b.zip | |
x86/tdx: Detect running as a TDX guest in early boot
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>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20220405232939.73860-2-kirill.shutemov@linux.intel.com
Diffstat (limited to 'kernel/fail_function.c')
0 files changed, 0 insertions, 0 deletions