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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: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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1 changed files with 9 additions and 2 deletions
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@ -227,14 +227,21 @@ static ssize_t write(struct file *file, const char __user *in,
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struct lguest *lg = file->private_data;
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const unsigned long __user *input = (const unsigned long __user *)in;
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unsigned long req;
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struct lg_cpu *cpu;
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unsigned int cpu_id = *off;
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if (get_user(req, input) != 0)
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return -EFAULT;
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input++;
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/* If you haven't initialized, you must do that first. */
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if (req != LHREQ_INITIALIZE && !lg)
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return -EINVAL;
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if (req != LHREQ_INITIALIZE) {
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if (!lg || (cpu_id >= lg->nr_cpus))
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return -EINVAL;
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cpu = &lg->cpus[cpu_id];
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if (!cpu)
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return -EINVAL;
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}
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/* Once the Guest is dead, all you can do is read() why it died. */
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if (lg && lg->dead)
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