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Re: [Qemu-devel] ivshmem property size should be a size, not a string
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] ivshmem property size should be a size, not a string |
Date: |
Mon, 23 Nov 2015 15:46:18 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.5 (gnu/linux) |
Marc-André Lureau <address@hidden> writes:
> Hi
>
> ----- Original Message -----
>> >
>> > You can't migrate the peers.
>>
>> Then explain the case N'=0 to me: how can you migrate the master so that
>> it's connected to a server afterwards?
>
> Dest qemu: -incoming.. -chardev socket,path=dest-server
>
> That is, start your destination qemu with a destination server. The master
> origin qemu will migrate the shared memory, and the dest memory will be sync
> when the migration is done.
Got it!
>> > It works fine in the tests. Feel free to point out races or other issues.
>>
>> I think I did: doorbell detection is inherently racy.
>>
>> If you think it isn't, please refute my reasoning.
>
> I gave you some clues on how I did it in ivshmem-test.c: waiting for a
> signature on the memory to be mapped (and also checking that peers
> received ids)
>
>> If it's not broken, please explain to me how the guest should find out
>> whether its ivshmem device sports a doorbell.
>
> If you have received ID, you should be good to use the doorbell.
That's not a complete answer, so let me try a different tack.
What value will a read of register IVPosition yield
* if the device has no doorbell:
I think the answer is -1.
* if the device has a doorbell, but it isn't ready, yet:
I think the answer is -1.
* if the device has a doorbell, and it is ready.
This is the part you answered already: >= 0.
Please correct mistakes.
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, (continued)
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Markus Armbruster, 2015/11/20
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Marc-André Lureau, 2015/11/20
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Markus Armbruster, 2015/11/20
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Marc-André Lureau, 2015/11/20
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Markus Armbruster, 2015/11/23
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Marc-André Lureau, 2015/11/23
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Markus Armbruster, 2015/11/23
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Marc-André Lureau, 2015/11/23
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Markus Armbruster, 2015/11/23
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Marc-André Lureau, 2015/11/23
- Re: [Qemu-devel] ivshmem property size should be a size, not a string,
Markus Armbruster <=
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Marc-André Lureau, 2015/11/23
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Markus Armbruster, 2015/11/23
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Eric Blake, 2015/11/23
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Marc-André Lureau, 2015/11/23
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Markus Armbruster, 2015/11/24
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Marc-André Lureau, 2015/11/24
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Markus Armbruster, 2015/11/24
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Marc-André Lureau, 2015/11/24
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Markus Armbruster, 2015/11/24
- Re: [Qemu-devel] ivshmem property size should be a size, not a string, Markus Armbruster, 2015/11/23