Kai Huang 5d092b6611 x86/tdx: Zero out the missing RSI in TDX_HYPERCALL macro ... In the TDX_HYPERCALL asm, after the TDCALL instruction returns from the untrusted VMM, the registers that the TDX guest shares to the VMM need to be cleared to avoid speculative execution of VMM-provided values. RSI is specified in the bitmap of those registers, but it is missing when zeroing out those registers in the current TDX_HYPERCALL. It was there when it was originally added in commit 752d13305c ("x86/tdx: Expand __tdx_hypercall() to handle more arguments"), but was later removed in commit 1e70c68037 ("x86/tdx: Do not corrupt frame-pointer in __tdx_hypercall()"), which was correct because %rsi is later restored in the "pop %rsi". However a later commit 7a3a401874 ("x86/tdx: Drop flags from __tdx_hypercall()") removed that "pop %rsi" but forgot to add the "xor %rsi, %rsi" back. Fix by adding it back. Fixes: 7a3a401874 ("x86/tdx: Drop flags from __tdx_hypercall()") Signed-off-by: Kai Huang <kai.huang@intel.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/all/e7d1157074a0b45d34564d5f17f3e0ffee8115e9.1692096753.git.kai.huang%40intel.com		2023-09-11 16:31:52 -07:00
..
tdx	x86/tdx: Zero out the missing RSI in TDX_HYPERCALL macro	2023-09-11 16:31:52 -07:00
core.c	x86/coco: Get rid of accessor functions	2023-05-09 12:53:16 +02:00
Makefile	x86/tdx: Detect running as a TDX guest in early boot	2022-04-07 08:27:50 -07:00