[RFC PATCH 13/16] powerpc/xive: record guest queue page address

[RFC PATCH 13/16] powerpc/xive: 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. Let's just record it when the
queue is configured.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 arch/powerpc/include/asm/xive.h       | 1 +
 arch/powerpc/kvm/book3s_xive_native.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/arch/powerpc/include/asm/xive.h b/arch/powerpc/include/asm/xive.h
index aef28248b5b7..4096e4164ada 100644
--- a/arch/powerpc/include/asm/xive.h
+++ b/arch/powerpc/include/asm/xive.h
@@ -73,6 +73,7 @@ struct xive_q {
 	u32			esc_irq;
 	atomic_t		count;
 	atomic_t		pending_count;
+	u64			guest_qpage;
 };
 
 /* 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 789c137f6b31..d705de3c5d65 100644
--- a/arch/powerpc/kvm/book3s_xive_native.c
+++ b/arch/powerpc/kvm/book3s_xive_native.c
@@ -693,6 +693,9 @@ static int kvmppc_h_int_set_queue_config(struct kvm_vcpu *vcpu,
 	}
 	qaddr = page_to_virt(page) + (qpage & ~PAGE_MASK);
 
+	/* Backup queue page guest address for migration */
+	q->guest_qpage = qpage;
+
 	rc = xive_native_configure_queue(xc->vp_id, q, priority,
 					 (__be32 *) qaddr, qsize, true);
 	if (rc) {
-- 
2.13.6