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Date: Fri, 20 May 2022 06:13:14 +0300 From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> To: tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, dave.hansen@...el.com, luto@...nel.org, peterz@...radead.org Cc: ak@...ux.intel.com, dan.j.williams@...el.com, david@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org, sathyanarayanan.kuppuswamy@...ux.intel.com, seanjc@...gle.com, thomas.lendacky@....com, x86@...nel.org, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> Subject: [PATCHv2 1/3] x86/tdx: Fix early #VE handling 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@...ux.intel.com> Fixes: 32e72854fa5f ("x86/tdx: Port I/O: Add early boot support") --- 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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