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Thu, 5 Feb 2026 03:57:19 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 292798] bhyve: VMX triple fault in efi windows bootloader Date: Thu, 05 Feb 2026 03:57:19 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bhyve X-Bugzilla-Version: 15.0-STABLE X-Bugzilla-Keywords: bhyve X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: nikolaytihonov2022@gmail.com X-Bugzilla-Status: Closed X-Bugzilla-Resolution: FIXED X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: virtualization@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_status resolution Message-ID: In-Reply-To: References: Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="UTF-8" X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated List-Id: Discussion List-Archive: https://lists.freebsd.org/archives/freebsd-virtualization List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: freebsd-virtualization@freebsd.org Sender: owner-freebsd-virtualization@FreeBSD.org MIME-Version: 1.0 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D292798 Mykola K. changed: What |Removed |Added ---------------------------------------------------------------------------- Status|New |Closed Resolution|--- |FIXED --- Comment #5 from Mykola K. --- Case solved.=20 For Windows you need Data Execution Prevention, or NX in cpu flags. CPU leaf 0x80000001 EDX bit 20. If dmesg doesn't report NX flag in AMD Extended Feat= ures - then you don't have it. If you don't have NX, Windows Bootloader will try force it and triple fault. Bhyve doesn't make up any NX flags, unlike KVM does - that confirms why I h= ad this exact VM working in past.=20 If you facing same problem on Z440 please go to BIOS, somewhere in Legacy settings there will be Data Execution Prevention - ENABLE it! --=20 You are receiving this mail because: You are the assignee for the bug.=