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[Qemu-devel] [PATCH V3 4/4] vifo: introduce new VFIO ioctl VFIO_IOMMU_GE
From: |
Yulei Zhang |
Subject: |
[Qemu-devel] [PATCH V3 4/4] vifo: introduce new VFIO ioctl VFIO_IOMMU_GET_DIRTY_BITMAP |
Date: |
Mon, 5 Mar 2018 14:00:53 +0800 |
New VFIO ioctl VFIO_IOMMU_GET_DIRTY_BITMAP is used to fetch the
bitmap of pinned memory in iommu container, we need copy those
memory to the target during the migration as they are dirtied by
mdev devices.
Signed-off-by: Yulei Zhang <address@hidden>
---
hw/vfio/common.c | 34 ++++++++++++++++++++++++++++++++++
linux-headers/linux/vfio.h | 14 ++++++++++++++
2 files changed, 48 insertions(+)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 7b2924c..a952554 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -35,6 +35,7 @@
#include "sysemu/kvm.h"
#include "trace.h"
#include "qapi/error.h"
+#include "exec/ram_addr.h"
struct vfio_group_head vfio_group_list =
QLIST_HEAD_INITIALIZER(vfio_group_list);
@@ -624,9 +625,42 @@ static void vfio_listener_region_del(MemoryListener
*listener,
}
}
+static void vfio_log_sync(MemoryListener *listener,
+ MemoryRegionSection *section)
+{
+ VFIOContainer *container = container_of(listener, VFIOContainer, listener);
+ VFIOGroup *group = QLIST_FIRST(&container->group_list);
+ VFIODevice *vbasedev;
+ QLIST_FOREACH(vbasedev, &group->device_list, next) {
+ if (vbasedev->device_state == VFIO_DEVICE_START) {
+ return;
+ }
+ }
+
+ struct vfio_iommu_get_dirty_bitmap *d;
+ ram_addr_t size = int128_get64(section->size);
+ unsigned long page_nr = size >> TARGET_PAGE_BITS;
+ unsigned long bitmap_size =
+ (BITS_TO_LONGS(page_nr) + 1) * sizeof(unsigned long);
+ d = g_malloc0(sizeof(*d) + bitmap_size);
+ d->start_addr = section->offset_within_address_space;
+ d->page_nr = page_nr;
+
+ if (ioctl(container->fd, VFIO_IOMMU_GET_DIRTY_BITMAP, d)) {
+ error_report("vfio: Failed to fetch dirty pages for migration");
+ goto exit;
+ }
+
+ cpu_physical_memory_set_dirty_lebitmap((unsigned long *)&d->dirty_bitmap,
+ d->start_addr, d->page_nr);
+exit:
+ g_free(d);
+}
+
static const MemoryListener vfio_memory_listener = {
.region_add = vfio_listener_region_add,
.region_del = vfio_listener_region_del,
+ .log_sync = vfio_log_sync,
};
static void vfio_listener_release(VFIOContainer *container)
diff --git a/linux-headers/linux/vfio.h b/linux-headers/linux/vfio.h
index 4451a8f..a41f73b 100644
--- a/linux-headers/linux/vfio.h
+++ b/linux-headers/linux/vfio.h
@@ -574,6 +574,20 @@ struct vfio_iommu_type1_dma_unmap {
#define VFIO_IOMMU_ENABLE _IO(VFIO_TYPE, VFIO_BASE + 15)
#define VFIO_IOMMU_DISABLE _IO(VFIO_TYPE, VFIO_BASE + 16)
+/**
+ * VFIO_IOMMU_GET_DIRTY_BITMAP - _IOW(VFIO_TYPE, VFIO_BASE + 17,
+ * struct vfio_iommu_get_dirty_bitmap)
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+struct vfio_iommu_get_dirty_bitmap {
+ __u64 start_addr;
+ __u64 page_nr;
+ __u8 dirty_bitmap[];
+};
+
+#define VFIO_IOMMU_GET_DIRTY_BITMAP _IO(VFIO_TYPE, VFIO_BASE + 17)
+
/* -------- Additional API for SPAPR TCE (Server POWERPC) IOMMU -------- */
/*
--
2.7.4
- [Qemu-devel] [PATCH V3 0/4] vfio: Introduce Live migration capability to vfio_mdev device, Yulei Zhang, 2018/03/05
- [Qemu-devel] [PATCH V3 2/4] vfio: Add vm status change callback to stop/restart the mdev device, Yulei Zhang, 2018/03/05
- [Qemu-devel] [PATCH V3 1/4] vfio: introduce a new VFIO subregion for mdev device migration support, Yulei Zhang, 2018/03/05
- [Qemu-devel] [PATCH V3 3/4] vfio: Add struct vfio_vmstate_info to introduce put/get callback funtion for vfio device status save/restore, Yulei Zhang, 2018/03/05
- [Qemu-devel] [PATCH V3 4/4] vifo: introduce new VFIO ioctl VFIO_IOMMU_GET_DIRTY_BITMAP,
Yulei Zhang <=
- Re: [Qemu-devel] [PATCH V3 0/4] vfio: Introduce Live migration capability to vfio_mdev device, no-reply, 2018/03/05
- Re: [Qemu-devel] [PATCH V3 0/4] vfio: Introduce Live migration capability to vfio_mdev device, Kirti Wankhede, 2018/03/05
- Re: [Qemu-devel] [PATCH V3 0/4] vfio: Introduce Live migration capability to vfio_mdev device, Alex Williamson, 2018/03/12