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Commit 7ea07a15 authored by Glauber de Oliveira Costa's avatar Glauber de Oliveira Costa Committed by Rusty Russell
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lguest: make write() operation smp aware 



This patch makes the write() file operation smp aware. Which means, receiving
the vcpu_id value through the offset parameter, and being well aware to which
vcpu we're talking to.

Signed-off-by: default avatarGlauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent d0953d42

drivers/lguest/lguest_user.c

+9 −2
Original line number Original line Diff line number Diff line
@@ -227,14 +227,21 @@ static ssize_t write(struct file *file, const char __user *in, 
	struct lguest *lg = file->private_data;

	struct lguest *lg = file->private_data;

	const unsigned long __user *input = (const unsigned long __user *)in;

	const unsigned long __user *input = (const unsigned long __user *)in;

	unsigned long req;

	unsigned long req;

	struct lg_cpu *cpu;

	unsigned int cpu_id = *off;





	if (get_user(req, input) != 0)

	if (get_user(req, input) != 0)

		return -EFAULT;

		return -EFAULT;

	input++;

	input++;





	/* If you haven't initialized, you must do that first. */

	/* If you haven't initialized, you must do that first. */

	if (req != LHREQ_INITIALIZE && !lg)

	if (req != LHREQ_INITIALIZE) {

		if (!lg || (cpu_id >= lg->nr_cpus))

			return -EINVAL;

		cpu = &lg->cpus[cpu_id];

		if (!cpu)

			return -EINVAL;

			return -EINVAL;

	}





	/* Once the Guest is dead, all you can do is read() why it died. */

	/* Once the Guest is dead, all you can do is read() why it died. */

	if (lg && lg->dead)

	if (lg && lg->dead)