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Message-Id: <20220614120135.14812-2-kirill.shutemov@linux.intel.com>
Date: Tue, 14 Jun 2022 15:01:33 +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: [PATCHv4 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")
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.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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