[PATCH v2 08/16] KVM: PPC: Book3S HV: XIVE: add a control to sync the sources

[Cédric Le Goater]

This control will be used by the H_INT_SYNC hcall from QEMU.

Signed-off-by: Cédric Le Goater <clg at kaod.org>
---
 arch/powerpc/include/uapi/asm/kvm.h        |  1 +
 arch/powerpc/kvm/book3s_xive_native.c      | 34 ++++++++++++++++++++++
 Documentation/virtual/kvm/devices/xive.txt |  9 ++++++
 3 files changed, 44 insertions(+)

diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/include/uapi/asm/kvm.h
index 7ae8cb22af7d..289c504b7c1d 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_GRP_SOURCE		2	/* 64-bit source attributes */
 #define KVM_DEV_XIVE_GRP_SOURCE_CONFIG	3	/* 64-bit source attributes */
 #define KVM_DEV_XIVE_GRP_EQ_CONFIG	4	/* 64-bit eq attributes */
+#define KVM_DEV_XIVE_GRP_SOURCE_SYNC	5       /* 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 bb3e121c918a..dd2a9d411fe7 100644
--- a/arch/powerpc/kvm/book3s_xive_native.c
+++ b/arch/powerpc/kvm/book3s_xive_native.c
@@ -341,6 +341,36 @@ static int kvmppc_xive_native_set_source_config(struct kvmppc_xive *xive,
 						       priority, eisn);
 }
 
+static int kvmppc_xive_native_sync_source(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", __func__, irq);
+
+	sb = kvmppc_xive_find_source(xive, irq, &src);
+	if (!sb)
+		return -ENOENT;
+
+	state = &sb->irq_state[src];
+
+	if (!state->valid)
+		return -EINVAL;
+
+	arch_spin_lock(&sb->lock);
+
+	kvmppc_xive_select_irq(state, &hw_num, &xd);
+	xive_native_sync_source(hw_num);
+
+	arch_spin_unlock(&sb->lock);
+
+	return 0;
+}
+
 static int xive_native_validate_queue_size(u32 qsize)
 {
 	switch (qsize) {
@@ -631,6 +661,9 @@ static int kvmppc_xive_native_set_attr(struct kvm_device *dev,
 	case KVM_DEV_XIVE_GRP_EQ_CONFIG:
 		return kvmppc_xive_native_set_queue_config(xive, attr->attr,
 							   attr->addr);
+	case KVM_DEV_XIVE_GRP_SOURCE_SYNC:
+		return kvmppc_xive_native_sync_source(xive, attr->attr,
+						      attr->addr);
 	}
 	return -ENXIO;
 }
@@ -660,6 +693,7 @@ static int kvmppc_xive_native_has_attr(struct kvm_device *dev,
 		break;
 	case KVM_DEV_XIVE_GRP_SOURCE:
 	case KVM_DEV_XIVE_GRP_SOURCE_CONFIG:
+	case KVM_DEV_XIVE_GRP_SOURCE_SYNC:
 		if (attr->attr >= KVMPPC_XIVE_FIRST_IRQ &&
 		    attr->attr < KVMPPC_XIVE_NR_IRQS)
 			return 0;
diff --git a/Documentation/virtual/kvm/devices/xive.txt b/Documentation/virtual/kvm/devices/xive.txt
index f1d007f485a9..267634eae9e0 100644
--- a/Documentation/virtual/kvm/devices/xive.txt
+++ b/Documentation/virtual/kvm/devices/xive.txt
@@ -86,3 +86,12 @@ the legacy interrupt mode, referred as XICS (POWER7/8).
     -EFAULT: Invalid user pointer for attr->addr.
     -ENOMEM: Invalid queue address
     -EIO:    Configuration of the underlying HW failed
+
+  5. KVM_DEV_XIVE_GRP_SOURCE_SYNC (write only)
+  Synchronize the source to flush event notification
+  Attributes:
+    Interrupt source number  (64-bit)
+  Errors:
+    -ENOENT: Unknown source number
+    -EINVAL: Not initialized source number, invalid priority or
+             invalid CPU number.
-- 
2.20.1