From 04a8f72e877b9a912ffd7afa84209909577d1d96 Mon Sep 17 00:00:00 2001 From: Igor Druzhinin Date: Wed, 25 Apr 2018 14:46:47 +0100 Subject: [PATCH] xen/hvm: correct reporting of modified memory under physmap during migration When global_log_dirty is enabled VRAM modification tracking never worked correctly. The address that is passed to xen_hvm_modified_memory() is not the effective PFN but RAM block address which is not the same for VRAM. We need to make a translation for this address into PFN using physmap. Since there is no way to access physmap properly inside xen_hvm_modified_memory() let's make it a global structure. Signed-off-by: Igor Druzhinin Acked-by: Anthony PERARD Signed-off-by: Stefano Stabellini --- hw/i386/xen/xen-hvm.c | 37 ++++++++++++++++++----------------- hw/i386/xen/xen-mapcache.c | 2 +- include/sysemu/xen-mapcache.h | 5 ++--- 3 files changed, 22 insertions(+), 22 deletions(-) diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c index 6ffa3c22cc..2afab6573b 100644 --- a/hw/i386/xen/xen-hvm.c +++ b/hw/i386/xen/xen-hvm.c @@ -86,6 +86,8 @@ typedef struct XenPhysmap { QLIST_ENTRY(XenPhysmap) list; } XenPhysmap; +static QLIST_HEAD(, XenPhysmap) xen_physmap; + typedef struct XenIOState { ioservid_t ioservid; shared_iopage_t *shared_page; @@ -107,7 +109,6 @@ typedef struct XenIOState { MemoryListener memory_listener; MemoryListener io_listener; DeviceListener device_listener; - QLIST_HEAD(, XenPhysmap) physmap; hwaddr free_phys_offset; const XenPhysmap *log_for_dirtybit; @@ -274,14 +275,13 @@ void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr, g_free(pfn_list); } -static XenPhysmap *get_physmapping(XenIOState *state, - hwaddr start_addr, ram_addr_t size) +static XenPhysmap *get_physmapping(hwaddr start_addr, ram_addr_t size) { XenPhysmap *physmap = NULL; start_addr &= TARGET_PAGE_MASK; - QLIST_FOREACH(physmap, &state->physmap, list) { + QLIST_FOREACH(physmap, &xen_physmap, list) { if (range_covers_byte(physmap->start_addr, physmap->size, start_addr)) { return physmap; } @@ -289,23 +289,21 @@ static XenPhysmap *get_physmapping(XenIOState *state, return NULL; } -#ifdef XEN_COMPAT_PHYSMAP -static hwaddr xen_phys_offset_to_gaddr(hwaddr start_addr, - ram_addr_t size, void *opaque) +static hwaddr xen_phys_offset_to_gaddr(hwaddr phys_offset, ram_addr_t size) { - hwaddr addr = start_addr & TARGET_PAGE_MASK; - XenIOState *xen_io_state = opaque; + hwaddr addr = phys_offset & TARGET_PAGE_MASK; XenPhysmap *physmap = NULL; - QLIST_FOREACH(physmap, &xen_io_state->physmap, list) { + QLIST_FOREACH(physmap, &xen_physmap, list) { if (range_covers_byte(physmap->phys_offset, physmap->size, addr)) { - return physmap->start_addr; + return physmap->start_addr + (phys_offset - physmap->phys_offset); } } - return start_addr; + return phys_offset; } +#ifdef XEN_COMPAT_PHYSMAP static int xen_save_physmap(XenIOState *state, XenPhysmap *physmap) { char path[80], value[17]; @@ -355,7 +353,7 @@ static int xen_add_to_physmap(XenIOState *state, hwaddr phys_offset = memory_region_get_ram_addr(mr); const char *mr_name; - if (get_physmapping(state, start_addr, size)) { + if (get_physmapping(start_addr, size)) { return 0; } if (size <= 0) { @@ -384,7 +382,7 @@ go_physmap: physmap->name = mr_name; physmap->phys_offset = phys_offset; - QLIST_INSERT_HEAD(&state->physmap, physmap, list); + QLIST_INSERT_HEAD(&xen_physmap, physmap, list); if (runstate_check(RUN_STATE_INMIGRATE)) { /* Now when we have a physmap entry we can replace a dummy mapping with @@ -428,7 +426,7 @@ static int xen_remove_from_physmap(XenIOState *state, XenPhysmap *physmap = NULL; hwaddr phys_offset = 0; - physmap = get_physmapping(state, start_addr, size); + physmap = get_physmapping(start_addr, size); if (physmap == NULL) { return -1; } @@ -597,7 +595,7 @@ static void xen_sync_dirty_bitmap(XenIOState *state, int rc, i, j; const XenPhysmap *physmap = NULL; - physmap = get_physmapping(state, start_addr, size); + physmap = get_physmapping(start_addr, size); if (physmap == NULL) { /* not handled */ return; @@ -1222,7 +1220,7 @@ static void xen_read_physmap(XenIOState *state) xen_domid, entries[i]); physmap->name = xs_read(state->xenstore, 0, path, &len); - QLIST_INSERT_HEAD(&state->physmap, physmap, list); + QLIST_INSERT_HEAD(&xen_physmap, physmap, list); } free(entries); } @@ -1374,7 +1372,6 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory) qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state); state->memory_listener = xen_memory_listener; - QLIST_INIT(&state->physmap); memory_listener_register(&state->memory_listener, &address_space_memory); state->log_for_dirtybit = NULL; @@ -1390,6 +1387,8 @@ void xen_hvm_init(PCMachineState *pcms, MemoryRegion **ram_memory) goto err; } xen_be_register_common(); + + QLIST_INIT(&xen_physmap); xen_read_physmap(state); /* Disable ACPI build because Xen handles it */ @@ -1461,6 +1460,8 @@ void xen_hvm_modified_memory(ram_addr_t start, ram_addr_t length) int rc; ram_addr_t start_pfn, nb_pages; + start = xen_phys_offset_to_gaddr(start, length); + if (length == 0) { length = TARGET_PAGE_SIZE; } diff --git a/hw/i386/xen/xen-mapcache.c b/hw/i386/xen/xen-mapcache.c index efa35dc6e0..12fd932284 100644 --- a/hw/i386/xen/xen-mapcache.c +++ b/hw/i386/xen/xen-mapcache.c @@ -319,7 +319,7 @@ tryagain: mapcache->last_entry = NULL; #ifdef XEN_COMPAT_PHYSMAP if (!translated && mapcache->phys_offset_to_gaddr) { - phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size, mapcache->opaque); + phys_addr = mapcache->phys_offset_to_gaddr(phys_addr, size); translated = true; goto tryagain; } diff --git a/include/sysemu/xen-mapcache.h b/include/sysemu/xen-mapcache.h index bd4d49e0a4..a03e2f1878 100644 --- a/include/sysemu/xen-mapcache.h +++ b/include/sysemu/xen-mapcache.h @@ -9,9 +9,8 @@ #ifndef XEN_MAPCACHE_H #define XEN_MAPCACHE_H -typedef hwaddr (*phys_offset_to_gaddr_t)(hwaddr start_addr, - ram_addr_t size, - void *opaque); +typedef hwaddr (*phys_offset_to_gaddr_t)(hwaddr phys_offset, + ram_addr_t size); #ifdef CONFIG_XEN void xen_map_cache_init(phys_offset_to_gaddr_t f,