diff options
| -rw-r--r-- | drivers/lguest/interrupts_and_traps.c | 6 | ||||
| -rw-r--r-- | drivers/lguest/lg.h | 1 | ||||
| -rw-r--r-- | drivers/lguest/x86/core.c | 6 |
3 files changed, 11 insertions, 2 deletions
diff --git a/drivers/lguest/interrupts_and_traps.c b/drivers/lguest/interrupts_and_traps.c index eb934b0242e0..67392b6ab845 100644 --- a/drivers/lguest/interrupts_and_traps.c +++ b/drivers/lguest/interrupts_and_traps.c @@ -331,7 +331,7 @@ void set_interrupt(struct lg_cpu *cpu, unsigned int irq) * Actually now I think of it, it's possible that Ron *is* half the Plan 9 * userbase. Oh well. */ -static bool could_be_syscall(unsigned int num) +bool could_be_syscall(unsigned int num) { /* Normal Linux IA32_SYSCALL_VECTOR or reserved vector? */ return num == IA32_SYSCALL_VECTOR || num == syscall_vector; @@ -416,6 +416,10 @@ bool deliver_trap(struct lg_cpu *cpu, unsigned int num) * * This routine indicates if a particular trap number could be delivered * directly. + * + * Unfortunately, Linux 4.6 started using an interrupt gate instead of a + * trap gate for syscalls, so this trick is ineffective. See Mastery for + * how we could do this anyway... */ static bool direct_trap(unsigned int num) { diff --git a/drivers/lguest/lg.h b/drivers/lguest/lg.h index ac8ad0461e80..69b3814afd2f 100644 --- a/drivers/lguest/lg.h +++ b/drivers/lguest/lg.h @@ -167,6 +167,7 @@ void guest_set_clockevent(struct lg_cpu *cpu, unsigned long delta); bool send_notify_to_eventfd(struct lg_cpu *cpu); void init_clockdev(struct lg_cpu *cpu); bool check_syscall_vector(struct lguest *lg); +bool could_be_syscall(unsigned int num); int init_interrupts(void); void free_interrupts(void); diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c index 6a4cd771a2be..adc162c7040d 100644 --- a/drivers/lguest/x86/core.c +++ b/drivers/lguest/x86/core.c @@ -429,8 +429,12 @@ void lguest_arch_handle_trap(struct lg_cpu *cpu) return; break; case 32 ... 255: + /* This might be a syscall. */ + if (could_be_syscall(cpu->regs->trapnum)) + break; + /* - * These values mean a real interrupt occurred, in which case + * Other values mean a real interrupt occurred, in which case * the Host handler has already been run. We just do a * friendly check if another process should now be run, then * return to run the Guest again. |