diff options
Diffstat (limited to 'util/memfd.c')
| -rw-r--r-- | util/memfd.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/util/memfd.c b/util/memfd.c index 7594af7089..07d579ea7d 100644 --- a/util/memfd.c +++ b/util/memfd.c @@ -29,6 +29,7 @@ #include "qapi/error.h" #include "qemu/memfd.h" +#include "qemu/host-utils.h" #if defined CONFIG_LINUX && !defined CONFIG_MEMFD #include <sys/syscall.h> @@ -56,9 +57,22 @@ static int memfd_create(const char *name, unsigned int flags) #define MFD_HUGETLB 0x0004U #endif +#ifndef MFD_HUGE_SHIFT +#define MFD_HUGE_SHIFT 26 +#endif + int qemu_memfd_create(const char *name, size_t size, bool hugetlb, - unsigned int seals, Error **errp) + uint64_t hugetlbsize, unsigned int seals, Error **errp) { + int htsize = hugetlbsize ? ctz64(hugetlbsize) : 0; + + if (htsize && 1 << htsize != hugetlbsize) { + error_setg(errp, "Hugepage size must be a power of 2"); + return -1; + } + + htsize = htsize << MFD_HUGE_SHIFT; + #ifdef CONFIG_LINUX int mfd = -1; unsigned int flags = MFD_CLOEXEC; @@ -68,8 +82,8 @@ int qemu_memfd_create(const char *name, size_t size, bool hugetlb, } if (hugetlb) { flags |= MFD_HUGETLB; + flags |= htsize; } - mfd = memfd_create(name, flags); if (mfd < 0) { goto err; @@ -104,11 +118,11 @@ void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals, int *fd, Error **errp) { void *ptr; - int mfd = qemu_memfd_create(name, size, false, seals, NULL); + int mfd = qemu_memfd_create(name, size, false, 0, seals, NULL); /* some systems have memfd without sealing */ if (mfd == -1) { - mfd = qemu_memfd_create(name, size, false, 0, NULL); + mfd = qemu_memfd_create(name, size, false, 0, 0, NULL); } if (mfd == -1) { |