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sparc/sparc64: grab BQL before calling cpu_check_irqs

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IRQ modification is part of device emulation and should be done while
the BQL is held to prevent races when MTTCG is enabled. This adds
assertions in the hw emulation layer and wraps the calls from helpers
in the BQL.

Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2017-03-01 13:20:02 +00:00
parent c34c762015
commit 5ee5993001
4 changed files with 22 additions and 0 deletions
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3
hw/sparc/sun4m.c
View file

@ -142,6 +142,9 @@ void cpu_check_irqs(CPUSPARCState *env)
{
CPUState *cs;
/* We should be holding the BQL before we mess with IRQs */
g_assert(qemu_mutex_iothread_locked());
if (env->pil_in && (env->interrupt_index == 0 ||
(env->interrupt_index & ~15) == TT_EXTINT)) {
unsigned int i;

3
hw/sparc64/sparc64.c
View file

@ -55,6 +55,9 @@ void cpu_check_irqs(CPUSPARCState *env)
uint32_t pil = env->pil_in |
(env->softint & ~(SOFTINT_TIMER | SOFTINT_STIMER));
/* We should be holding the BQL before we mess with IRQs */
g_assert(qemu_mutex_iothread_locked());
/* TT_IVEC has a higher priority (16) than TT_EXTINT (31..17) */
if (env->ivec_status & 0x20) {
return;

3
target/sparc/int64_helper.c
View file

@ -18,6 +18,7 @@
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "cpu.h"
#include "exec/helper-proto.h"
#include "exec/log.h"
@ -208,7 +209,9 @@ static bool do_modify_softint(CPUSPARCState *env, uint32_t value)
env->softint = value;
#if !defined(CONFIG_USER_ONLY)
if (cpu_interrupts_enabled(env)) {
qemu_mutex_lock_iothread();
cpu_check_irqs(env);
qemu_mutex_unlock_iothread();
}
#endif
return true;

13
target/sparc/win_helper.c
View file

@ -18,6 +18,7 @@
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
@ -82,6 +83,7 @@ void cpu_put_psr_raw(CPUSPARCState *env, target_ulong val)
#endif
}
/* Called with BQL held */
void cpu_put_psr(CPUSPARCState *env, target_ulong val)
{
cpu_put_psr_raw(env, val);
@ -153,7 +155,10 @@ void helper_wrpsr(CPUSPARCState *env, target_ulong new_psr)
if ((new_psr & PSR_CWP) >= env->nwindows) {
cpu_raise_exception_ra(env, TT_ILL_INSN, GETPC());
} else {
/* cpu_put_psr may trigger interrupts, hence BQL */
qemu_mutex_lock_iothread();
cpu_put_psr(env, new_psr);
qemu_mutex_unlock_iothread();
}
}
@ -368,7 +373,9 @@ void helper_wrpstate(CPUSPARCState *env, target_ulong new_state)
#if !defined(CONFIG_USER_ONLY)
if (cpu_interrupts_enabled(env)) {
qemu_mutex_lock_iothread();
cpu_check_irqs(env);
qemu_mutex_unlock_iothread();
}
#endif
}
@ -381,7 +388,9 @@ void helper_wrpil(CPUSPARCState *env, target_ulong new_pil)
env->psrpil = new_pil;
if (cpu_interrupts_enabled(env)) {
qemu_mutex_lock_iothread();
cpu_check_irqs(env);
qemu_mutex_unlock_iothread();
}
#endif
}
@ -408,7 +417,9 @@ void helper_done(CPUSPARCState *env)
#if !defined(CONFIG_USER_ONLY)
if (cpu_interrupts_enabled(env)) {
qemu_mutex_lock_iothread();
cpu_check_irqs(env);
qemu_mutex_unlock_iothread();
}
#endif
}
@ -435,7 +446,9 @@ void helper_retry(CPUSPARCState *env)
#if !defined(CONFIG_USER_ONLY)
if (cpu_interrupts_enabled(env)) {
qemu_mutex_lock_iothread();
cpu_check_irqs(env);
qemu_mutex_unlock_iothread();
}
#endif
}