[PATCH] KVM: PPC: Book3S HV: check for XIVE device before executing the XICS hcalls

[Paul Mackerras]

On Mon, Nov 27, 2017 at 08:30:17AM +0100, Cédric Le Goater wrote:
> When QEMU is started with the option kernel_irqchip=òff, the kvm XICS
> hcalls are being used even though a kvm XICS device has not been
> created on the host, resulting quickly in a failure and a broken
> guest.
> 
> The test checking if there is a XIVE device in the VM before executing
> the XICS hcalls is missing from the recent XICS-over-XIVE glue.
> 
> Signed-off-by: Cédric Le Goater <clg at kaod.org>

I think this is fixing the same bug that commit 00bb6ae50062 ("KVM:
PPC: Book3S HV: Don't call real-mode XICS hypercall handlers if not
enabled", 2017-10-26) addresses.

Do you think this patch is needed in addition to 00bb6ae50062?

Paul.