Date: Sat, 09 May 2020 09:50:04 +0000 From: bugzilla-noreply@freebsd.org To: virtualization@FreeBSD.org Subject: [Bug 246168] Ubuntu 20.04 KVM / QEMU Failure with nested FreeBSD bhyve Message-ID: <bug-246168-27103-9H9I6DqnXw@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-246168-27103@https.bugs.freebsd.org/bugzilla/> References: <bug-246168-27103@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D246168 --- Comment #10 from Peter Grehan <grehan@FreeBSD.org> --- I used a laptop-class CPU when trying the repro (core i5-8250U). In particu= lar, there is a difference in VT-x features as reported by the L1 guest: VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID vs your system: VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID,VID,PostIntr The one of interest here is that KVM is emulating APIC-virtualization (VID,PostIntr). One thing to try is to disable this feature in the L1 guest. In /boot/loader.conf, put an entry=20 hw.vmm.vmx.use_apic_vid=3D0 After (re)booting the L1 guest, the status of this parameter can be checked with: # sysctl hw.vmm.vmx.cap.virtual_interrupt_delivery hw.vmm.vmx.cap.virtual_interrupt_delivery: 0 <- should be zero --=20 You are receiving this mail because: You are the assignee for the bug.=
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