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Re: [PATCH] hw/char/pl011: Output characters using best-effort mode
From: |
Paolo Bonzini |
Subject: |
Re: [PATCH] hw/char/pl011: Output characters using best-effort mode |
Date: |
Fri, 21 Feb 2020 12:44:15 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 |
On 21/02/20 11:21, Peter Maydell wrote:
> Before you do that, I would suggest investigating:
> * is this a problem we've already had on x86 and that there is a
> standard solution for
Disconnected sockets always lose data (see tcp_chr_write in
chardev/char-socket.c).
For connected sockets, 8250 does at most 4 retries (each retry is
triggered by POLLOUT|POLLHUP). After these four retries the output
chardev is considered broken, just like in Gavin's patch, and only a
reset will restart the output.
> * should this be applicable to more than just the socket chardev?
> What's special about the socket chardev?
For 8250 there's no difference between socket and everything else.
Paolo
> I've added the chardev backend maintainers to the cc list.
- [PATCH] hw/char/pl011: Output characters using best-effort mode, Gavin Shan, 2020/02/20
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode, Philippe Mathieu-Daudé, 2020/02/20
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode, Marc Zyngier, 2020/02/20
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode, Peter Maydell, 2020/02/20
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode, Peter Maydell, 2020/02/21
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode,
Paolo Bonzini <=
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode, Peter Maydell, 2020/02/21
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode, Paolo Bonzini, 2020/02/21
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode, Peter Maydell, 2020/02/21
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode, Paolo Bonzini, 2020/02/21
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode, Gavin Shan, 2020/02/23
- Re: [PATCH] hw/char/pl011: Output characters using best-effort mode, Gavin Shan, 2020/02/23