Date: Wed, 09 Apr 2025 00:48:10 +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-Bq8JjxwkvV@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 --- Comment #15 from Keith White <kwhite.uottawa@gmail.com> --- No, I had not tried #10. I still wanted to see any errors and to be able to turn any workaround on/off. Thanks for the suggestion, though! I tried a modified version of #10 that provides a hw.vmm.svm.disable_decode_assist sysctl that optionally disables the decode_assist() check. This too works for me. A long-winded way of saying "yes" #10 also works for me. diff --git a/sys/amd64/vmm/amd/svm.c b/sys/amd64/vmm/amd/svm.c index 6c16daaa47c2..63f559037687 100644 --- a/sys/amd64/vmm/amd/svm.c +++ b/sys/amd64/vmm/amd/svm.c @@ -122,6 +122,11 @@ static uint32_t nasid; SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, num_asids, CTLFLAG_RDTUN, &nasid, 0, "Number of ASIDs supported by this processor"); +/* AMD A8 has no decode_assist, allow disabling the check */ +static int disable_decode_assist; +SYSCTL_INT(_hw_vmm_svm, OID_AUTO, disable_decode_assist, CTLFLAG_RWTUN, + &disable_decode_assist, 0, "Set to 1 to disable the decode_assist check"); + /* Current ASID generation for each host cpu */ static struct asid asid[MAXCPU]; @@ -146,7 +151,7 @@ static __inline int decode_assist(void) { - return (svm_feature & AMD_CPUID_SVM_DECODE_ASSIST); + return ((svm_feature & AMD_CPUID_SVM_DECODE_ASSIST) || disable_decode_assist); } static void -- You are receiving this mail because: You are the assignee for the bug.
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