[PATCH 1/6] Define data structures needed for dirty quota migration.

[Shivam Kumar <shivam.kumar1@nutanix.com>]

Define the data structures to be used on the KVM side:

vCPUDirtyQuotaContext: stores the dirty quota context for individual vCPUs
(shared between QEMU and KVM).
  dirty_counter: number of pages dirtied by the vCPU
  dirty_quota: limit on the number of pages the vCPU can dirty
dirty_quota_migration_enabled: flag to see if migration is on or off.

Co-developed-by: Anurag Madnawat <anurag.madnawat@nutanix.com>
Signed-off-by: Anurag Madnawat <anurag.madnawat@nutanix.com>
Signed-off-by: Shivam Kumar <shivam.kumar1@nutanix.com>
Signed-off-by: Shaju Abraham <shaju.abraham@nutanix.com>
Signed-off-by: Manish Mishra <manish.mishra@nutanix.com>
---
 include/linux/dirty_quota_migration.h | 11 +++++++++++
 include/linux/kvm_host.h              |  3 +++
 2 files changed, 14 insertions(+)
 create mode 100644 include/linux/dirty_quota_migration.h

diff --git a/include/linux/dirty_quota_migration.h b/include/linux/dirty_quota_migration.h
new file mode 100644
index 000000000000..6338cb6984df
--- /dev/null
+++ b/include/linux/dirty_quota_migration.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef DIRTY_QUOTA_MIGRATION_H
+#define DIRTY_QUOTA_MIGRATION_H
+#include <linux/kvm.h>
+
+struct vCPUDirtyQuotaContext {
+	u64 dirty_counter;
+	u64 dirty_quota;
+};
+
+#endif  /* DIRTY_QUOTA_MIGRATION_H */
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 0f18df7fe874..9f6165617c38 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -38,6 +38,7 @@
 
 #include <asm/kvm_host.h>
 #include <linux/kvm_dirty_ring.h>
+#include <linux/dirty_quota_migration.h>
 
 #ifndef KVM_MAX_VCPU_ID
 #define KVM_MAX_VCPU_ID KVM_MAX_VCPUS
@@ -361,6 +362,7 @@ struct kvm_vcpu {
 	 * it is a valid slot.
 	 */
 	int last_used_slot;
+	struct vCPUDirtyQuotaContext *vCPUdqctx;
 };
 
 /* must be called with irqs disabled */
@@ -618,6 +620,7 @@ struct kvm {
 	unsigned int max_halt_poll_ns;
 	u32 dirty_ring_size;
 	bool vm_bugged;
+	bool dirty_quota_migration_enabled;
 
 #ifdef CONFIG_HAVE_KVM_PM_NOTIFIER
 	struct notifier_block pm_notifier;
-- 
2.22.3