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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] [RFC] vhost: Can we change synchronize_rcu to call_rcu in vhost_set_memory() in vhost kernel module? |
Date: | Mon, 12 May 2014 12:14:25 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 |
Il 12/05/2014 12:08, Michael S. Tsirkin ha scritto:
On Mon, May 12, 2014 at 11:57:32AM +0200, Paolo Bonzini wrote:Perhaps we can check for cases where only the address is changing, and poke at an existing struct kvm_kernel_irq_routing_entry without doing any RCU synchronization?I suspect interrupts can get lost then: e.g. if address didn't match any cpus, now it matches some. No?
Can you explain the problem more verbosely? :)Multiple writers would still be protected by the mutex, so you cannot have an "in-place update" writer racing with a "copy the array" writer.
Paolo
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