diff options
| -rw-r--r-- | exec.c | 54 |
1 files changed, 53 insertions, 1 deletions
@@ -77,6 +77,10 @@ #include "monitor/monitor.h" +#ifdef CONFIG_LIBDAXCTL +#include <daxctl/libdaxctl.h> +#endif + //#define DEBUG_SUBPAGE #if !defined(CONFIG_USER_ONLY) @@ -1745,6 +1749,46 @@ static int64_t get_file_size(int fd) return size; } +static int64_t get_file_align(int fd) +{ + int64_t align = -1; +#if defined(__linux__) && defined(CONFIG_LIBDAXCTL) + struct stat st; + + if (fstat(fd, &st) < 0) { + return -errno; + } + + /* Special handling for devdax character devices */ + if (S_ISCHR(st.st_mode)) { + g_autofree char *path = NULL; + g_autofree char *rpath = NULL; + struct daxctl_ctx *ctx; + struct daxctl_region *region; + int rc = 0; + + path = g_strdup_printf("/sys/dev/char/%d:%d", + major(st.st_rdev), minor(st.st_rdev)); + rpath = realpath(path, NULL); + + rc = daxctl_new(&ctx); + if (rc) { + return -1; + } + + daxctl_region_foreach(ctx, region) { + if (strstr(rpath, daxctl_region_get_path(region))) { + align = daxctl_region_get_align(region); + break; + } + } + daxctl_unref(ctx); + } +#endif /* defined(__linux__) && defined(CONFIG_LIBDAXCTL) */ + + return align; +} + static int file_ram_open(const char *path, const char *region_name, bool *created, @@ -2296,7 +2340,7 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, { RAMBlock *new_block; Error *local_err = NULL; - int64_t file_size; + int64_t file_size, file_align; /* Just support these ram flags by now. */ assert((ram_flags & ~(RAM_SHARED | RAM_PMEM)) == 0); @@ -2332,6 +2376,14 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr, return NULL; } + file_align = get_file_align(fd); + if (file_align > 0 && mr && file_align > mr->align) { + error_setg(errp, "backing store align 0x%" PRIx64 + " is larger than 'align' option 0x" PRIx64, + file_align, mr->align); + return NULL; + } + new_block = g_malloc0(sizeof(*new_block)); new_block->mr = mr; new_block->used_length = size; |