Add support for the memfd_create syscall. If the host does not have the libc wrapper, translate to a direct syscall with NC-macro.
Buglink: https://bugs.launchpad.net/qemu/+bug/1734792 Signed-off-by: Shu-Chun Weng <s...@google.com> --- include/qemu/memfd.h | 4 ++++ linux-user/syscall.c | 11 +++++++++++ util/memfd.c | 2 +- 3 files changed, 16 insertions(+), 1 deletion(-) diff --git a/include/qemu/memfd.h b/include/qemu/memfd.h index d551c28b68..975b6bdb77 100644 --- a/include/qemu/memfd.h +++ b/include/qemu/memfd.h @@ -32,6 +32,10 @@ #define MFD_HUGE_SHIFT 26 #endif +#if defined CONFIG_LINUX && !defined CONFIG_MEMFD +int memfd_create(const char *name, unsigned int flags); +#endif + int qemu_memfd_create(const char *name, size_t size, bool hugetlb, uint64_t hugetlbsize, unsigned int seals, Error **errp); bool qemu_memfd_alloc_check(void); diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 8367cb138d..b506c1f40e 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -20,6 +20,7 @@ #include "qemu/osdep.h" #include "qemu/cutils.h" #include "qemu/path.h" +#include "qemu/memfd.h" #include <elf.h> #include <endian.h> #include <grp.h> @@ -11938,6 +11939,16 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, /* PowerPC specific. */ return do_swapcontext(cpu_env, arg1, arg2, arg3); #endif +#ifdef TARGET_NR_memfd_create + case TARGET_NR_memfd_create: + p = lock_user_string(arg1); + if (!p) { + return -TARGET_EFAULT; + } + ret = get_errno(memfd_create(p, arg2)); + unlock_user(p, arg1, 0); + return ret; +#endif default: qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num); diff --git a/util/memfd.c b/util/memfd.c index 00334e5b21..4a3c07e0be 100644 --- a/util/memfd.c +++ b/util/memfd.c @@ -35,7 +35,7 @@ #include <sys/syscall.h> #include <asm/unistd.h> -static int memfd_create(const char *name, unsigned int flags) +int memfd_create(const char *name, unsigned int flags) { #ifdef __NR_memfd_create return syscall(__NR_memfd_create, name, flags); -- 2.23.0.rc1.153.gdeed80330f-goog
