Date: Wed, 12 Mar 2025 18:41:16 +0000 From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 203643] [bhyve] NetBSD causes bhyve to exit on AMD processors Message-ID: <bug-203643-27103-AyWislgkfq@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-203643-27103@https.bugs.freebsd.org/bugzilla/> References: <bug-203643-27103@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203643 Mark Peek <mp@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mp@FreeBSD.org --- Comment #9 from Mark Peek <mp@FreeBSD.org> --- Booting and installing NetBSD on an AMD Ryzen 7 7840U worked fine. Looking at the error being returned: exitcode 0x7b shows it was an IO exit exitinfo1 can be decoded from the AMD Programmers Manual Volume 2 Chapter 15.10.2 0x3f8021c shows REP OUTS to port 0x3f8 (COM1 serial port) exitinfo2 is the address of the instruction following the OUTS The IO is handled in svm_handle_io() https://github.com/freebsd/freebsd-src/blob/main/sys/amd64/vmm/amd/svm.c#L785 There is a check for the SVM DecodeAssist feature here: https://github.com/freebsd/freebsd-src/blob/main/sys/amd64/vmm/amd/svm.c#L808 The system information listed in this bug report do not have DecodeAssist listed. The 7840U I used shows these SVM features: SVM: NP,NRIP,VClean,AFlush,DAssist,NAsids=32768 By stubbing that call to decode_assist() to return 0, I was able to get the same error to occur on my hardware. Looking back in the history, the check svm_handlt_io() was put in via this commit and commit message: https://github.com/freebsd/freebsd-src/commit/bbadcde418c29fe312a1d9d39b768735f285efbd "Don't attempt to handle INS/OUTS VM-exits unless the DecodeAssist capabilityis available. The effective segment field in EXITINFO1 is not valid withoutthis capability." You could try modifying the code to not do the decode_assist() check and see if it works on your system. Or try turning on graphics for the VM to see if it will boot using a graphics console. -- You are receiving this mail because: You are the assignee for the bug.
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