diff options
| -rw-r--r-- | target-ppc/kvm.c | 57 |
1 files changed, 51 insertions, 6 deletions
diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c index 12328a4027..84ae447556 100644 --- a/target-ppc/kvm.c +++ b/target-ppc/kvm.c @@ -39,6 +39,7 @@ #include "sysemu/watchdog.h" #include "trace.h" #include "exec/gdbstub.h" +#include "sysemu/hostmem.h" //#define DEBUG_KVM @@ -302,16 +303,11 @@ static void kvm_get_smmu_info(PowerPCCPU *cpu, struct kvm_ppc_smmu_info *info) kvm_get_fallback_smmu_info(cpu, info); } -static long getrampagesize(void) +static long gethugepagesize(const char *mem_path) { struct statfs fs; int ret; - if (!mem_path) { - /* guest RAM is backed by normal anonymous pages */ - return getpagesize(); - } - do { ret = statfs(mem_path, &fs); } while (ret != 0 && errno == EINTR); @@ -333,6 +329,55 @@ static long getrampagesize(void) return fs.f_bsize; } +static int find_max_supported_pagesize(Object *obj, void *opaque) +{ + char *mem_path; + long *hpsize_min = opaque; + + if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) { + mem_path = object_property_get_str(obj, "mem-path", NULL); + if (mem_path) { + long hpsize = gethugepagesize(mem_path); + if (hpsize < *hpsize_min) { + *hpsize_min = hpsize; + } + } else { + *hpsize_min = getpagesize(); + } + } + + return 0; +} + +static long getrampagesize(void) +{ + long hpsize = LONG_MAX; + Object *memdev_root; + + if (mem_path) { + return gethugepagesize(mem_path); + } + + /* it's possible we have memory-backend objects with + * hugepage-backed RAM. these may get mapped into system + * address space via -numa parameters or memory hotplug + * hooks. we want to take these into account, but we + * also want to make sure these supported hugepage + * sizes are applicable across the entire range of memory + * we may boot from, so we take the min across all + * backends, and assume normal pages in cases where a + * backend isn't backed by hugepages. + */ + memdev_root = object_resolve_path("/objects", NULL); + if (!memdev_root) { + return getpagesize(); + } + + object_child_foreach(memdev_root, find_max_supported_pagesize, &hpsize); + + return (hpsize == LONG_MAX) ? getpagesize() : hpsize; +} + static bool kvm_valid_page_size(uint32_t flags, long rampgsize, uint32_t shift) { if (!(flags & KVM_PPC_PAGE_SIZES_REAL)) { |