When migration of a VM is initiated, a first copy of the RAM is
transferred to the destination before the VM is stopped. At that time,
QEMU needs to perform a XIVE quiesce sequence to stop the flow of
event notifications and stabilize the EQs. The sources are masked and
the XIVE IC is synced with the KVM ioctl KVM_DEV_XIVE_GRP_SYNC.
Signed-off-by: Cédric Le Goater <c...@kaod.org>
---
arch/powerpc/include/uapi/asm/kvm.h | 1 +
arch/powerpc/kvm/book3s_xive_native.c | 32 +++++++++++++++++++++++++++
2 files changed, 33 insertions(+)
diff --git a/arch/powerpc/include/uapi/asm/kvm.h
b/arch/powerpc/include/uapi/asm/kvm.h
index 6fc9660c5aec..f3b859223b80 100644
--- a/arch/powerpc/include/uapi/asm/kvm.h
+++ b/arch/powerpc/include/uapi/asm/kvm.h
@@ -681,6 +681,7 @@ struct kvm_ppc_cpu_char {
#define KVM_DEV_XIVE_GET_TIMA_FD 2
#define KVM_DEV_XIVE_VC_BASE 3
#define KVM_DEV_XIVE_GRP_SOURCES 2 /* 64-bit source attributes */
+#define KVM_DEV_XIVE_GRP_SYNC 3 /* 64-bit source attributes */
/* Layout of 64-bit XIVE source attribute values */
#define KVM_XIVE_LEVEL_SENSITIVE (1ULL << 0)
diff --git a/arch/powerpc/kvm/book3s_xive_native.c
b/arch/powerpc/kvm/book3s_xive_native.c
index 4ca75aade069..a8052867afc1 100644
--- a/arch/powerpc/kvm/book3s_xive_native.c
+++ b/arch/powerpc/kvm/book3s_xive_native.c
@@ -459,6 +459,35 @@ static int kvmppc_xive_native_set_source(struct
kvmppc_xive *xive, long irq,
return 0;
}
+static int kvmppc_xive_native_sync(struct kvmppc_xive *xive, long irq, u64
addr)
+{
+ struct kvmppc_xive_src_block *sb;
+ struct kvmppc_xive_irq_state *state;
+ struct xive_irq_data *xd;
+ u32 hw_num;
+ u16 src;
+
+ pr_devel("%s irq=0x%lx\n", __func__, irq);
+
+ sb = kvmppc_xive_find_source(xive, irq, &src);
+ if (!sb)
+ return -ENOENT;
+
+ state = &sb->irq_state[src];
+
+ if (!state->valid)
+ return -ENOENT;
+
+ arch_spin_lock(&sb->lock);
+
+ kvmppc_xive_select_irq(state, &hw_num, &xd);
+ xive_native_sync_source(hw_num);
+ xive_native_sync_queue(hw_num);
+
+ arch_spin_unlock(&sb->lock);
+ return 0;
+}
+
static int kvmppc_xive_native_set_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
@@ -474,6 +503,8 @@ static int kvmppc_xive_native_set_attr(struct kvm_device
*dev,
case KVM_DEV_XIVE_GRP_SOURCES:
return kvmppc_xive_native_set_source(xive, attr->attr,
attr->addr);
+ case KVM_DEV_XIVE_GRP_SYNC:
+ return kvmppc_xive_native_sync(xive, attr->attr, attr->addr);
}
return -ENXIO;
}
@@ -511,6 +542,7 @@ static int kvmppc_xive_native_has_attr(struct kvm_device
*dev,
}
break;
case KVM_DEV_XIVE_GRP_SOURCES:
+ case KVM_DEV_XIVE_GRP_SYNC:
if (attr->attr >= KVMPPC_XIVE_FIRST_IRQ &&
attr->attr < KVMPPC_XIVE_NR_IRQS)
return 0;
--
2.20.1
