[PATCH 12/19] KVM: PPC: Book3S HV: record guest queue page address

[Cédric Le Goater]

The guest physical address of the event queue will be part of the
state to transfer in the migration. Cache its value when the queue is
configured, it will save us an OPAL call.

Signed-off-by: Cédric Le Goater <c...@kaod.org>
---
 arch/powerpc/include/asm/xive.h       | 2 ++
 arch/powerpc/kvm/book3s_xive_native.c | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/arch/powerpc/include/asm/xive.h b/arch/powerpc/include/asm/xive.h
index 7a7aa22d8258..e90c3c5d9533 100644
--- a/arch/powerpc/include/asm/xive.h
+++ b/arch/powerpc/include/asm/xive.h
@@ -74,6 +74,8 @@ struct xive_q {
        u32                     esc_irq;
        atomic_t                count;
        atomic_t                pending_count;
+       u64                     guest_qpage;
+       u32                     guest_qsize;
 };
 
 /* Global enable flags for the XIVE support */
diff --git a/arch/powerpc/kvm/book3s_xive_native.c 
b/arch/powerpc/kvm/book3s_xive_native.c
index 35d806740c3a..4ca75aade069 100644
--- a/arch/powerpc/kvm/book3s_xive_native.c
+++ b/arch/powerpc/kvm/book3s_xive_native.c
@@ -708,6 +708,10 @@ static int kvmppc_h_int_set_queue_config(struct kvm_vcpu 
*vcpu,
        }
        qaddr = page_to_virt(page) + (qpage & ~PAGE_MASK);
 
+       /* Backup queue page address and size for migration */
+       q->guest_qpage = qpage;
+       q->guest_qsize = qsize;
+
        rc = xive_native_configure_queue(xc->vp_id, q, priority,
                                         (__be32 *) qaddr, qsize, true);
        if (rc) {
-- 
2.20.1