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linux-user: add memfd_create

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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>
This commit is contained in:
Shu-Chun Weng 2019-08-19 11:09:47 -07:00 committed by Laurent Vivier
parent 7f4341e84b
commit 9bdfa4d23f
3 changed files with 17 additions and 1 deletions
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4
include/qemu/memfd.h
View File

@ -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);

12
linux-user/syscall.c
View File

@ -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);

2
util/memfd.c
View File

@ -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);