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From:   bugzilla-daemon@bugzilla.kernel.org
To:     kvm@vger.kernel.org
Subject: [Bug 207099] New: VM fails to boot with invariant tsc enabled with
 kvm_amd
Date:   Sat, 04 Apr 2020 11:38:31 +0000
X-Bugzilla-Reason: None
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: AssignedTo virtualization_kvm@kernel-bugs.osdl.org
X-Bugzilla-Product: Virtualization
X-Bugzilla-Component: kvm
X-Bugzilla-Version: unspecified
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: high
X-Bugzilla-Who: geggen54@gmail.com
X-Bugzilla-Status: NEW
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X-Bugzilla-Priority: P1
X-Bugzilla-Assigned-To: virtualization_kvm@kernel-bugs.osdl.org
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https://bugzilla.kernel.org/show_bug.cgi?id=207099

            Bug ID: 207099
           Summary: VM fails to boot with invariant tsc enabled with
                    kvm_amd
           Product: Virtualization
           Version: unspecified
    Kernel Version: 5.6.0 - 5.6.2
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: geggen54@gmail.com
        Regression: No

After the 5.6.0 release my windows 10 VM running on AMD 3950x fails to boot
when option "migratable=no,+invtsc" is enabled. The VM starts the boot process
but after a few seconds I get a bluescreen with the error "Kernel security
check failed". 

Neither the host or guest has any logs that I can find with any more details on
the issue, or even that it happens at all.

The issue is reproducible at least for me with a minimum set of options in QEMU
with no enlightenments:

"-M type=q35,accel=kvm,kernel_irqchip=on -cpu host, kvm=off,
migratable=no,+invtsc, topoext -smp 24,sockets=1, cores=12, threads=2
-enable-kvm"

I've tried changing the options kvm_amd.avic and nested to no avail.

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