MemoryRegionCache did not know about virtio support for IOMMUs (because the two features were developed at the same time). Revert MemoryRegionCache to "normal" address_space_* operations for 2.9, as it is simpler than undoing the virtio patches.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> --- exec.c | 64 +++++++++------------------------------------------ include/exec/memory.h | 10 ++++---- 2 files changed, 15 insertions(+), 59 deletions(-) diff --git a/exec.c b/exec.c index e57a8a2..c97ef4a 100644 --- a/exec.c +++ b/exec.c @@ -3236,75 +3236,33 @@ int64_t address_space_cache_init(MemoryRegionCache *cache, hwaddr len, bool is_write) { - hwaddr l, xlat; - MemoryRegion *mr; - void *ptr; - - assert(len > 0); - - l = len; - mr = address_space_translate(as, addr, &xlat, &l, is_write); - if (!memory_access_is_direct(mr, is_write)) { - return -EINVAL; - } - - l = address_space_extend_translation(as, addr, len, mr, xlat, l, is_write); - ptr = qemu_ram_ptr_length(mr->ram_block, xlat, &l); - - cache->xlat = xlat; - cache->is_write = is_write; - cache->mr = mr; - cache->ptr = ptr; - cache->len = l; - memory_region_ref(cache->mr); - - return l; + cache->len = len; + cache->as = as; + cache->xlat = addr; + return len; } void address_space_cache_invalidate(MemoryRegionCache *cache, hwaddr addr, hwaddr access_len) { - assert(cache->is_write); - invalidate_and_set_dirty(cache->mr, addr + cache->xlat, access_len); } void address_space_cache_destroy(MemoryRegionCache *cache) { - if (!cache->mr) { - return; - } - - if (xen_enabled()) { - xen_invalidate_map_cache_entry(cache->ptr); - } - memory_region_unref(cache->mr); - cache->mr = NULL; -} - -/* Called from RCU critical section. This function has the same - * semantics as address_space_translate, but it only works on a - * predefined range of a MemoryRegion that was mapped with - * address_space_cache_init. - */ -static inline MemoryRegion *address_space_translate_cached( - MemoryRegionCache *cache, hwaddr addr, hwaddr *xlat, - hwaddr *plen, bool is_write) -{ - assert(addr < cache->len && *plen <= cache->len - addr); - *xlat = addr + cache->xlat; - return cache->mr; + cache->as = NULL; } #define ARG1_DECL MemoryRegionCache *cache #define ARG1 cache #define SUFFIX _cached -#define TRANSLATE(...) address_space_translate_cached(cache, __VA_ARGS__) +#define TRANSLATE(addr, ...) \ + address_space_translate(cache->as, cache->xlat + (addr), __VA_ARGS__) #define IS_DIRECT(mr, is_write) true -#define MAP_RAM(mr, ofs) (cache->ptr + (ofs - cache->xlat)) -#define INVALIDATE(mr, ofs, len) ((void)0) -#define RCU_READ_LOCK() ((void)0) -#define RCU_READ_UNLOCK() ((void)0) +#define MAP_RAM(mr, ofs) qemu_map_ram_ptr((mr)->ram_block, ofs) +#define INVALIDATE(mr, ofs, len) invalidate_and_set_dirty(mr, ofs, len) +#define RCU_READ_LOCK() rcu_read_lock() +#define RCU_READ_UNLOCK() rcu_read_unlock() #include "memory_ldst.inc.c" /* virtual memory access for debug (includes writing to ROM) */ diff --git a/include/exec/memory.h b/include/exec/memory.h index e39256a..f20b191 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -1426,13 +1426,11 @@ void stq_be_phys(AddressSpace *as, hwaddr addr, uint64_t val); struct MemoryRegionCache { hwaddr xlat; - void *ptr; hwaddr len; - MemoryRegion *mr; - bool is_write; + AddressSpace *as; }; -#define MEMORY_REGION_CACHE_INVALID ((MemoryRegionCache) { .mr = NULL }) +#define MEMORY_REGION_CACHE_INVALID ((MemoryRegionCache) { .as = NULL }) /* address_space_cache_init: prepare for repeated access to a physical * memory region @@ -1688,7 +1686,7 @@ address_space_read_cached(MemoryRegionCache *cache, hwaddr addr, void *buf, int len) { assert(addr < cache->len && len <= cache->len - addr); - memcpy(buf, cache->ptr + addr, len); + address_space_read(cache->as, cache->xlat + addr, MEMTXATTRS_UNSPECIFIED, buf, len); } /** @@ -1704,7 +1702,7 @@ address_space_write_cached(MemoryRegionCache *cache, hwaddr addr, void *buf, int len) { assert(addr < cache->len && len <= cache->len - addr); - memcpy(cache->ptr + addr, buf, len); + address_space_write(cache->as, cache->xlat + addr, MEMTXATTRS_UNSPECIFIED, buf, len); } #endif -- 1.8.3.1