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Re: [Qemu-arm] [Qemu-devel] [PATCH 00/23] arm: Add virtualization to GIC

From: Andrew Jones
Subject: Re: [Qemu-arm] [Qemu-devel] [PATCH 00/23] arm: Add virtualization to GICv3, and enable EL2 on 64-bit CPUs
Date: Tue, 13 Dec 2016 22:16:06 +0100
User-agent: Mutt/ (2016-04-01)

On Tue, Dec 13, 2016 at 10:36:01AM +0000, Peter Maydell wrote:
> This patchset adds support for the Virtualization extensions to QEMU's
> GICv3 emulation. This was the last missing piece that was stopping
> us from turning on the EL2 support in the CPU model, so the patchset
> also adds support for enabling it all on the virt board via the
> '-machine virtualization=on' option.
> The result works well enough to allow booting a KVM outer guest kernel
> and then running QEMU + an inner guest under KVM inside it. The outer
> guest KVM also passes the kvm-unit-tests GIC tests.

I've started some testing with this. When I boot an outer (L1) kernel
with more than one cpu allocated I get

[    3.441908] CPU: CPUs started in inconsistent modes
[    3.442787] ------------[ cut here ]------------
[    3.445434] WARNING: CPU: 0 PID: 1 at arch/arm64/kernel/smp.c:418 

and KVM does not init. Booting with only one cpu I see we do start in EL2
and KVM does init. I'm booting the L1 kernel through UEFI (AAVMF). Also,
my L1 guest kernel is 4.9 based, but not pure upstream. I can try a more
pure 4.9 kernel with a defconfig later.


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