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KVM: PPC: Book3S: Fix server always zero from kvmppc_xive_get_xive()

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In KVM's XICS-on-XIVE emulation, kvmppc_xive_get_xive() returns the
value of state->guest_server as "server". However, this value is not
set by it's counterpart kvmppc_xive_set_xive(). When the guest uses
this interface to migrate interrupts away from a CPU that is going
offline, it sees all interrupts as belonging to CPU 0, so they are
left assigned to (now) offline CPUs.

This patch removes the guest_server field from the state, and returns
act_server in it's place (that is, the CPU actually handling the
interrupt, which may differ from the one requested).

Fixes: 5af5099385 ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller")
Cc: stable@vger.kernel.org
Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Sam Bobroff
2017-09-26 16:47:04 +10:00
committed by Radim Krčmář
parent 9e66317d3c
commit 2fb1e94645
2 changed files with 2 additions and 4 deletions
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arch/powerpc/kvm/book3s_xive.h
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@@ -35,7 +35,6 @@ struct kvmppc_xive_irq_state {
struct xive_irq_data *pt_data; /* XIVE Pass-through associated data */
/* Targetting as set by guest */
u32 guest_server; /* Current guest selected target */
u8 guest_priority; /* Guest set priority */
u8 saved_priority; /* Saved priority when masking */