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lguest: add infrastructure for userspace to deliver a trap to the guest.

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This is required for instruction emulation to move to userspace.

Signed-off-by: Rusty Russell <[email protected]>
This commit is contained in:
Rusty Russell 2015-02-11 15:15:09 +10:30
commit 8ed313001a
2 changed files with 20 additions and 0 deletions
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19
drivers/lguest/lguest_user.c
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@ -243,6 +243,23 @@ static int user_send_irq(struct lg_cpu *cpu, const unsigned long __user *input)
return 0;
}
/*L:053
* Deliver a trap: this is used by the Launcher if it can't emulate
* an instruction.
*/
static int trap(struct lg_cpu *cpu, const unsigned long __user *input)
{
unsigned long trapnum;
if (get_user(trapnum, input) != 0)
return -EFAULT;
if (!deliver_trap(cpu, trapnum))
return -EINVAL;
return 0;
}
/*L:040
* Once our Guest is initialized, the Launcher makes it run by reading
* from /dev/lguest.
@ -487,6 +504,8 @@ static ssize_t write(struct file *file, const char __user *in,
return getreg_setup(cpu, input);
case LHREQ_SETREG:
return setreg(cpu, input);
case LHREQ_TRAP:
return trap(cpu, input);
default:
return -EINVAL;
}