spapr: Reset CAS & IRQ subsystem after devices

This fixes a nasty regression in qemu-4.1 for the 'pseries' machine,
caused by the new "dual" interrupt controller model.  Specifically,
qemu can crash when used with KVM if a 'system_reset' is requested
while there's active I/O in the guest.

The problem is that in spapr_machine_reset() we:

1. Reset the CAS vector state
	spapr_ovec_cleanup(spapr->ov5_cas);

2. Reset all devices
	qemu_devices_reset()

3. Reset the irq subsystem
	spapr_irq_reset();

However (1) implicitly changes the interrupt delivery mode, because
whether we're using XICS or XIVE depends on the CAS state.  We don't
properly initialize the new irq mode until (3) though - in particular
setting up the KVM devices.

During (2), we can temporarily drop the BQL allowing some irqs to be
delivered which will go to an irq system that's not properly set up.

Specifically, if the previous guest was in (KVM) XIVE mode, the CAS
reset will put us back in XICS mode.  kvm_kernel_irqchip() still
returns true, because XIVE was using KVM, however XICs doesn't have
its KVM components intialized and kernel_xics_fd == -1.  When the irq
is delivered it goes via ics_kvm_set_irq() which assert()s that
kernel_xics_fd != -1.

This change addresses the problem by delaying the CAS reset until
after the devices reset.  The device reset should quiesce all the
devices so we won't get irqs delivered while we mess around with the
IRQ.  The CAS reset and irq re-initialize should also now be under the
same BQL critical section so nothing else should be able to interrupt
it either.

We also move the spapr_irq_msi_reset() used in one of the legacy irq
modes, since it logically makes sense at the same point as the
spapr_irq_reset() (it's essentially an equivalent operation for older
machine types).  Since we don't need to switch between different
interrupt controllers for those old machine types it shouldn't
actually be broken in those cases though.

Cc: Cédric Le Goater <clg@kaod.org>

Fixes: b2e22477 "spapr: add a 'reset' method to the sPAPR IRQ backend"
Fixes: 13db0cd9 "spapr: introduce a new sPAPR IRQ backend supporting
                 XIVE and XICS"
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

0 files changed, 0 insertions, 0 deletions