Date: Fri, 19 Feb 2021 12:55:39 +0000 From: bugzilla-noreply@freebsd.org To: fs@FreeBSD.org Subject: [Bug 253617] ffs_sbget: panic: Unregistered use of FPU in kernel Message-ID: <bug-253617-3630-afPSVT1nOM@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-253617-3630@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253617 --- Comment #4 from Konstantin Belousov <kib@FreeBSD.org> --- Note that CRC32 instruction is qualified on SSE4.2, but it does not use any of FPU registers. It operates on GPR so it does not require saving user context before executing in kernel. It should not even cause #NM (Device Not Available) exception at all, according to SDM. Adding fpu_kern_enter() around it would hugely hit non-buggy environments like bare metal or non-buggy hypervisors. Try to report it to QEMU devs. -- You are receiving this mail because: You are the assignee for the bug.home | help
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