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linux-user: Initialize pseudo-random seeds for all guest cpus

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When the -seed option is given, call qemu_guest_random_seed_main,
putting the subsystem into deterministic mode.  Pass derived seeds
to each cpu created during clone; which is a no-op unless the
subsystem is in deterministic mode.

Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2019-03-14 13:10:53 -07:00
parent 9c09a2518e
commit 5ebdd77494
2 changed files with 22 additions and 11 deletions
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3
linux-user/syscall.c
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@ -107,6 +107,7 @@
#include "uname.h"
#include "qemu.h"
#include "qemu/guest-random.h"
#include "fd-trans.h"
#ifndef CLONE_IO
@ -5482,6 +5483,7 @@ static void *clone_func(void *arg)
put_user_u32(info->tid, info->child_tidptr);
if (info->parent_tidptr)
put_user_u32(info->tid, info->parent_tidptr);
qemu_guest_random_seed_thread_part2(cpu->random_seed);
/* Enable signals. */
sigprocmask(SIG_SETMASK, &info->sigmask, NULL);
/* Signal to the parent that we're ready. */
@ -5568,6 +5570,7 @@ static int do_fork(CPUArchState *env, unsigned int flags, abi_ulong newsp,
initializing, so temporarily block all signals. */
sigfillset(&sigmask);
sigprocmask(SIG_BLOCK, &sigmask, &info.sigmask);
cpu->random_seed = qemu_guest_random_seed_thread_part1();
/* If this is our first additional thread, we need to ensure we
* generate code for parallel execution and flush old translations.