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29 July 2024, 15:18:00 UTC
Revision cdd85786f4b3b9273e4376e69aa95a2d71722764 authored by Kirill A. Shutemov on 14 June 2022, 12:01:34 UTC, committed by Dave Hansen on 15 June 2022, 18:05:16 UTC 
x86/tdx: Clarify RIP adjustments in #VE handler
 
After successful #VE handling, tdx_handle_virt_exception() has to move
RIP to the next instruction. The handler needs to know the length of the
instruction.

If the #VE happened due to instruction execution, the GET_VEINFO TDX
module call provides info on the instruction in R10, including its length.

For #VE due to EPT violation, the info in R10 is not populand and the
kernel must decode the instruction manually to find out its length.

Restructure the code to make it explicit that the instruction length
depends on the type of #VE. Make individual #VE handlers return
the instruction length on success or -errno on failure.

[ dhansen: fix up changelog and comments ]

Suggested-by: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lkml.kernel.org/r/20220614120135.14812-3-kirill.shutemov@linux.intel.com
1 parent 60428d8
History
Tip revision: cdd85786f4b3b9273e4376e69aa95a2d71722764 authored by Kirill A. Shutemov on 14 June 2022, 12:01:34 UTC
x86/tdx: Clarify RIP adjustments in #VE handler
Tip revision: cdd8578
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