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    Subject[PATCHv4 1/3] x86/tdx: Fix early #VE handling
    Date
    Move RIP in tdx_early_handle_ve() after handling the exception. Failure
    to do that leads to infinite loop of exceptions.

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    Fixes: 32e72854fa5f ("x86/tdx: Port I/O: Add early boot support")
    Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
    ---
    arch/x86/coco/tdx/tdx.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    diff --git a/arch/x86/coco/tdx/tdx.c b/arch/x86/coco/tdx/tdx.c
    index 03deb4d6920d..faae53f8d559 100644
    --- a/arch/x86/coco/tdx/tdx.c
    +++ b/arch/x86/coco/tdx/tdx.c
    @@ -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)
    {
    struct ve_info ve;
    + bool ret;

    tdx_get_ve_info(&ve);

    if (ve.exit_reason != EXIT_REASON_IO_INSTRUCTION)
    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)
    --
    2.35.1
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