[Bug 116731] New: KVM guest fails to boot OVMF firmware with SMP enabled

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=116731

            Bug ID: 116731
           Summary: KVM guest fails to boot OVMF firmware with SMP enabled
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.2 and later
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: jonathan.n.boeing@gmail.com
        Regression: No

If I enable SMP and an OVMF firmware in my VM, QEMU either hangs at boot or
dies with the error message: KVM: entry failed, hardware error 0x80000021

A minimal QEMU command line to repro is:

qemu-system-x86_64 -enable-kvm -smp cpus=2 -drive
if=pflash,format=raw,file=OVMF.fd

Running host kernel 4.4.6, and I bisected the failure to OVMF commit 94941c8:
UefiCpuPkg: CpuDxe: broadcast MTRR changes to APs

Doing some debugging, I built the latest OVMF from git and bisected the failure
to kernel commit (merged for 4.2rc1) d28bc9d: KVM: x86: INIT and reset
sequences are different

To clarify, the failing config is:
Host kernel d28bc9d+ (~4.2rc1), OVMF 94941c8+, and SMP enabled

Working configs are:
Host kernels 4.1-4.4, OVMF tip, and SMP disabled
Host kernels 4.1-4.4, SeaBIOS (instead of OVMF), and SMP enabled
Host kernel 4.1, OVMF tip, and SMP enabled
Host kernels 4.1-4.4, OVMF prior to 94941c8, and SMP enabled

The host system is running a quad-core Intel Penryn CPU (which supports VMX but
not EPT). Per OVMF dev Laszlo Ersek, the failure is related to lacking EPT
support.

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