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Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset
From: |
Blue Swirl |
Subject: |
Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset |
Date: |
Sun, 2 Oct 2011 20:55:49 +0000 |
On Sun, Oct 2, 2011 at 8:41 PM, Avi Kivity <address@hidden> wrote:
>> >
>> >
>> > Would not this corruption also happen on real hardware? If reset
>> > to the disk controller is delayed by a slow gate or extra
>> > capacitance on a line?
>>
>> Maybe, but the delays are probably too short on real HW before any
>> packets are sent or disk gets written. On QEMU, I/O can be
>> instantaneous.
>>
>
> Right, this is a real difference. If any hardware actually depends on this,
> we can model it by launching a timer instead of issuing the I/O. When the
> reset arrives to the disk controller, it will cancel the timer.
>
> This is expensive both to code and in run-time performance, but we can afford
> the expense since we don't have such a case, yes?
It's already in, see -win2k-hack and floppy DMA hack.
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, (continued)
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset,
Blue Swirl <=
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Paolo Bonzini, 2011/10/03
- Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/04
Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Peter Maydell, 2011/10/01
Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Avi Kivity, 2011/10/02
Re: [Qemu-devel] [PATCH 11/22] i8259: Update IRQ state after reset, Blue Swirl, 2011/10/02