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x86/tdx: Fix early #VE handling

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tdx_early_handle_ve() does not increment RIP after successfully
handling the exception.  That leads to infinite loop of exceptions.

Move RIP when exceptions are successfully handled.

[ dhansen: make problem statement more clear ]

Fixes: 32e72854fa ("x86/tdx: Port I/O: Add early boot support")
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Link: https://lkml.kernel.org/r/20220614120135.14812-2-kirill.shutemov@linux.intel.com
This commit is contained in:
Kirill A. Shutemov 2022-06-14 15:01:33 +03:00 • committed by Dave Hansen
parent e32683c6f7
commit 60428d8bc2
1 changed files with 5 additions and 1 deletions
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6
arch/x86/coco/tdx/tdx.c
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@ -447,13 +447,17 @@ static bool handle_io(struct pt_regs *regs, u32 exit_qual)
__init bool tdx_early_handle_ve(struct pt_regs *regs) __init bool tdx_early_handle_ve(struct pt_regs *regs)
{ {
struct ve_info ve; struct ve_info ve;
bool ret;
tdx_get_ve_info(&ve); tdx_get_ve_info(&ve);
if (ve.exit_reason != EXIT_REASON_IO_INSTRUCTION) if (ve.exit_reason != EXIT_REASON_IO_INSTRUCTION)
return false; return false;
return handle_io(regs, ve.exit_qual); ret = handle_io(regs, ve.exit_qual);
if (ret)
regs->ip += ve.instr_len;
return ret;
} }
void tdx_get_ve_info(struct ve_info *ve) void tdx_get_ve_info(struct ve_info *ve)