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Re: [PATCH v10] x86: use / "support" UDB
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Wed, 3 Jun 2026 11:52:55 -0400
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>
- Delivery-date: Wed, 03 Jun 2026 15:53:19 +0000
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On 2026-04-08 08:12, Jan Beulich wrote:
With opcode D6h now firmly reserved as another #UD-raising one in 64-bit
mode, use that instead of the two-byte UD2 for bug frame marking.
While there also make a minor adjustment to the emulator.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Just a heads up. I was testing Xen with Fedora 44 QEMU 10.2.2 TCG, and
a BUG() did not fire as expected. Single stepping over UDB I did not
see any registers change and execution continued.
QEMU 11.0 does emulate UDB properly - the change was:
commit a71706fc116d263c6661b5c7176150dfe0298d29
Author: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Wed Dec 10 09:42:01 2025 +0100
target/i386/tcg: mark more instructions that are invalid in 64-bit mode
I didn't check earlier version of QEMU.
Regards,
Jason
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