From: Anthony PERARD <anthony.perard@xxxxxxxxxx>
This patch introduces phys memory client for Xen.
Only sync dirty_bitmap and set_memory are actually implemented.
migration_log will stay empty for the moment.
Xen can only log one range for bit change, so only the range in the
first call will be synced.
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
xen-all.c | 253 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 253 insertions(+), 0 deletions(-)
diff --git a/xen-all.c b/xen-all.c
index 939d9b7..59178ad 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -47,6 +47,14 @@
#define BUFFER_IO_MAX_DELAY 100
+typedef struct XenPhysmap {
+ target_phys_addr_t start_addr;
+ ram_addr_t size;
+ target_phys_addr_t phys_offset;
+
+ QLIST_ENTRY(XenPhysmap) list;
+} XenPhysmap;
+
typedef struct XenIOState {
shared_iopage_t *shared_page;
buffered_iopage_t *buffered_io_page;
@@ -59,6 +67,9 @@ typedef struct XenIOState {
int send_vcpu;
struct xs_handle *xenstore;
+ CPUPhysMemoryClient client;
+ QLIST_HEAD(, XenPhysmap) physmap;
+ const XenPhysmap *log_for_dirtybit;
Notifier exit;
} XenIOState;
@@ -162,6 +173,243 @@ void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size)
qemu_free(pfn_list);
}
+static XenPhysmap *get_physmapping(XenIOState *state,
+ target_phys_addr_t start_addr, ram_addr_t
size)
+{
+ XenPhysmap *physmap = NULL;
+
+ start_addr = TARGET_PAGE_ALIGN(start_addr);
+ /* Search for a mapping inside another mapping */
+ QLIST_FOREACH(physmap, &state->physmap, list) {
+ if (physmap->start_addr <= start_addr &&
+ start_addr + size <= (physmap->start_addr + physmap->size)) {
+ return physmap;
+ }
+ }
+ return NULL;
+}
+
+#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 340
+static int xen_add_to_physmap(XenIOState *state,
+ target_phys_addr_t start_addr,
+ ram_addr_t size,
+ target_phys_addr_t phys_offset)
+{
+ unsigned long i = 0;
+ int rc = 0;
+ XenPhysmap *physmap = NULL;
+
+ if (get_physmapping(state, start_addr, size)) {
+ return 0;
+ }
+ if (size <= 0) {
+ return -1;
+ }
+
+ DPRINTF("mapping vram to %llx - %llx, from %llx\n", start_addr, start_addr
+ size, phys_offset);
+ for (i = 0; i < size >> TARGET_PAGE_BITS; i++) {
+ unsigned long idx = (phys_offset >> TARGET_PAGE_BITS) + i;
+
+ xen_pfn_t gpfn = (start_addr >> TARGET_PAGE_BITS) + i;
+ rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn,
idx, gpfn);
+ if (rc) {
+ DPRINTF("add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
+ PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
+ return -rc;
+ }
+ }
+
+ physmap = qemu_malloc(sizeof (XenPhysmap));
+
+ physmap->start_addr = start_addr;
+ physmap->size = size;
+ physmap->phys_offset = phys_offset;
+
+ QLIST_INSERT_HEAD(&state->physmap, physmap, list);
+
+ xc_domain_pin_memory_cacheattr(xen_xc, xen_domid,
+ start_addr >> TARGET_PAGE_BITS,
+ (start_addr + size) >> TARGET_PAGE_BITS,
+ XEN_DOMCTL_MEM_CACHEATTR_WB);
+ return 0;
+}
+
+static int xen_remove_from_physmap(XenIOState *state,
+ target_phys_addr_t start_addr,
+ ram_addr_t size)
+{
+ unsigned long i = 0;
+ int rc = 0;
+ XenPhysmap *physmap = NULL;
+ target_phys_addr_t phys_offset = 0;
+
+ physmap = get_physmapping(state, start_addr, size);
+ if (physmap == NULL) {
+ return -1;
+ }
+
+ phys_offset = physmap->phys_offset;
+ size = physmap->size;
+
+ DPRINTF("unmapping vram to %llx - %llx, from %llx\n", phys_offset,
phys_offset + size, start_addr);
+ for (i = 0; i < size >> TARGET_PAGE_BITS; i++) {
+ unsigned long idx = (start_addr >> TARGET_PAGE_BITS) + i;
+
+ xen_pfn_t gpfn = (phys_offset >> TARGET_PAGE_BITS) + i;
+ rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn,
idx, gpfn);
+ if (rc) {
+ fprintf(stderr, "add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
+ PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
+ return -rc;
+ }
+ }
+
+ QLIST_REMOVE(physmap, list);
+ if (state->log_for_dirtybit == physmap) {
+ state->log_for_dirtybit = NULL;
+ }
+ free(physmap);
+
+ return 0;
+}
+
+#else
+static int xen_add_to_physmap(XenIOState *state,
+ target_phys_addr_t start_addr,
+ ram_addr_t size,
+ target_phys_addr_t phys_offset)
+{
+ return -ENOSYS;
+}
+
+static int xen_remove_from_physmap(XenIOState *state,
+ target_phys_addr_t start_addr,
+ ram_addr_t size)
+{
+ return -ENOSYS;
+}
+#endif
+
+static void xen_client_set_memory(struct CPUPhysMemoryClient *client,
+ target_phys_addr_t start_addr,
+ ram_addr_t size,
+ ram_addr_t phys_offset)
+{
+ XenIOState *state = container_of(client, XenIOState, client);
+ ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
+ hvmmem_type_t mem_type;
+
+ start_addr = TARGET_PAGE_ALIGN(start_addr);
+ size = TARGET_PAGE_ALIGN(size);
+ phys_offset = TARGET_PAGE_ALIGN(phys_offset);
+
+ /* Xen does not need to know about this memory */
+ if (flags > IO_MEM_UNASSIGNED) {
+ return;
+ }
+
+ switch (flags) {
+ case IO_MEM_RAM:
+ xen_add_to_physmap(state, start_addr, size, phys_offset);
+ break;
+ case IO_MEM_ROM:
+ mem_type = HVMMEM_ram_ro;
+ if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type,
+ start_addr >> TARGET_PAGE_BITS,
+ size >> TARGET_PAGE_BITS)) {
+ DPRINTF("xc_hvm_set_mem_type error, addr: "TARGET_FMT_plx"\n",
+ start_addr);
+ }
+ break;
+ case IO_MEM_UNASSIGNED:
+ if (xen_remove_from_physmap(state, start_addr, size) < 0) {
+ DPRINTF("physmapping does not exist at "TARGET_FMT_plx"\n",
start_addr);
+ }
+ break;
+ }
+}
+
+static int xen_sync_dirty_bitmap(XenIOState *state,
+ target_phys_addr_t start_addr,
+ ram_addr_t size)
+{
+ target_phys_addr_t npages = size >> TARGET_PAGE_BITS;
+ target_phys_addr_t vram_offset = 0;
+ const int width = sizeof(unsigned long) * 8;
+ unsigned long bitmap[(npages + width - 1) / width];
+ int rc, i, j;
+ const XenPhysmap *physmap = NULL;
+
+ physmap = get_physmapping(state, start_addr, size);
+ if (physmap == NULL) {
+ /* not handled */
+ return -1;
+ }
+
+ if (state->log_for_dirtybit == NULL) {
+ state->log_for_dirtybit = physmap;
+ } else if (state->log_for_dirtybit != physmap) {
+ return -1;
+ }
+ vram_offset = physmap->phys_offset;
+
+ rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid,
+ start_addr >> TARGET_PAGE_BITS, npages,
+ bitmap);
+ if (rc) {
+ return rc;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(bitmap); i++) {
+ unsigned long map = bitmap[i];
+ while (map != 0) {
+ j = ffsl(map) - 1;
+ map &= ~(1ul << j);
+ cpu_physical_memory_set_dirty(vram_offset + (i * width + j) *
TARGET_PAGE_SIZE);
+ };
+ }
+
+ return 0;
+}
+
+static int xen_log_start(CPUPhysMemoryClient *client, target_phys_addr_t
phys_addr, ram_addr_t size)
+{
+ XenIOState *state = container_of(client, XenIOState, client);
+
+ return xen_sync_dirty_bitmap(state, phys_addr, size);
+}
+
+static int xen_log_stop(CPUPhysMemoryClient *client, target_phys_addr_t
phys_addr, ram_addr_t size)
+{
+ XenIOState *state = container_of(client, XenIOState, client);
+
+ state->log_for_dirtybit = NULL;
+ /* Disable dirty bit tracking */
+ return xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL);
+}
+
+static int xen_client_sync_dirty_bitmap(struct CPUPhysMemoryClient *client,
+ target_phys_addr_t start_addr,
+ target_phys_addr_t end_addr)
+{
+ XenIOState *state = container_of(client, XenIOState, client);
+
+ return xen_sync_dirty_bitmap(state, start_addr, end_addr - start_addr);
+}
+
+static int xen_client_migration_log(struct CPUPhysMemoryClient *client,
+ int enable)
+{
+ return 0;
+}
+
+static CPUPhysMemoryClient xen_cpu_phys_memory_client = {
+ .set_memory = xen_client_set_memory,
+ .sync_dirty_bitmap = xen_client_sync_dirty_bitmap,
+ .migration_log = xen_client_migration_log,
+ .log_start = xen_log_start,
+ .log_stop = xen_log_stop,
+};
/* VCPU Operations, MMIO, IO ring ... */
@@ -553,6 +801,11 @@ int xen_init(int smp_cpus)
qemu_add_vm_change_state_handler(xen_vm_change_state_handler, state);
+ state->client = xen_cpu_phys_memory_client;
+ QLIST_INIT(&state->physmap);
+ cpu_register_phys_memory_client(&state->client);
+ state->log_for_dirtybit = NULL;
+
return 0;
}
--
1.7.1
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