diff options
| author | Shu-Chun Weng | 2019-08-19 20:09:47 +0200 |
|---|---|---|
| committer | Laurent Vivier | 2019-09-11 08:46:17 +0200 |
| commit | 9bdfa4d23f4395dab89a60eb6b05a0308792bd66 (patch) | |
| tree | 34e7c3dfeb9e5998a9c29bc76734cd9cf658769a | |
| parent | linux-user: fail and report on bad dfilter specs (diff) | |
| download | qemu-9bdfa4d23f4395dab89a60eb6b05a0308792bd66.tar.gz qemu-9bdfa4d23f4395dab89a60eb6b05a0308792bd66.tar.xz qemu-9bdfa4d23f4395dab89a60eb6b05a0308792bd66.zip | |
linux-user: add memfd_create
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 <scw@google.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20190819180947.180725-1-scw@google.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
| -rw-r--r-- | include/qemu/memfd.h | 4 | ||||
| -rw-r--r-- | linux-user/syscall.c | 12 | ||||
| -rw-r--r-- | util/memfd.c | 2 |
3 files changed, 17 insertions, 1 deletions
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 b42f59a32c..6928f654ce 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 "qemu/queue.h" #include <elf.h> #include <endian.h> @@ -11938,6 +11939,17 @@ 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)); + fd_trans_unregister(ret); + 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); |