Kirill A. Shutemov 65fab5bc03 x86/tdx: Exclude shared bit from __PHYSICAL_MASK ... In TDX guests, by default memory is protected from host access. If a guest needs to communicate with the VMM (like the I/O use case), it uses a single bit in the physical address to communicate the protected/shared attribute of the given page. In the x86 ARCH code, __PHYSICAL_MASK macro represents the width of the physical address in the given architecture. It is used in creating physical PAGE_MASK for address bits in the kernel. Since in TDX guest, a single bit is used as metadata, it needs to be excluded from valid physical address bits to avoid using incorrect addresses bits in the kernel. Enable DYNAMIC_PHYSICAL_MASK to support updating the __PHYSICAL_MASK. Co-developed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> 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: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/20220405232939.73860-6-kirill.shutemov@linux.intel.com		2022-04-07 08:27:51 -07:00
..
tdx	x86/tdx: Exclude shared bit from __PHYSICAL_MASK	2022-04-07 08:27:51 -07:00
core.c	x86/tdx: Extend the confidential computing API to support TDX guests	2022-04-07 08:27:50 -07:00
Makefile	x86/tdx: Detect running as a TDX guest in early boot	2022-04-07 08:27:50 -07:00