Date: Mon, 20 Aug 2018 12:46:47 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 230773] GDT limit needs reset on VMX exit Message-ID: <bug-230773-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230773 Bug ID: 230773 Summary: GDT limit needs reset on VMX exit Product: Base System Version: CURRENT Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: levon@movementarian.org Intel vol 3 27.5.2: "The base addresses for GDTR and IDTR are loaded from the GDTR base-address field and the IDTR base-address field, respectively. If the processor supports the Intel 64 architecture and the processor supports N < 64 linear-address bits, each of bits 63:N of each base address is set to the value of bit N–1 of that base address. The GDTR and IDTR limits are each set to FFFFH." As far as I could tell, bhyve doesn't do this in current FreeBSD, leaving the GDT limit significantly larger than the previous NGDT-based one. We found and fixed this in our port as seen here: https://github.com/joyent/illumos-joyent/commit/1d0338f3f33eec2ed45ec5a6cae30c399a3ef769#diff-5b270bdc09d0e88fd39cfed0ccd0c44b -- You are receiving this mail because: You are the assignee for the bug.
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