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Re: [Qemu-arm] [Qemu-devel] [PATCH 23/27] hw/core/or-irq: Support more t
From: |
Peter Maydell |
Subject: |
Re: [Qemu-arm] [Qemu-devel] [PATCH 23/27] hw/core/or-irq: Support more than 16 inputs to an OR gate |
Date: |
Wed, 30 May 2018 18:35:25 +0100 |
On 30 May 2018 at 17:59, Paolo Bonzini <address@hidden> wrote:
> On 21/05/2018 17:02, Peter Maydell wrote:
>> On 21 May 2018 at 15:34, Paolo Bonzini <address@hidden> wrote:
>>> Why do the levels have to be migrated at all? It should be enough if
>>> the IRQ level is either migrated manually, or restored (e.g. in
>>> post_save callbacks) through other data that is migrated.
>> This is standard behaviour for devices: they track their
>> inbound irq/gpio lines, and then that becomes internal state for
>> them that must be migrated.
>
> But or_irq's input are another device's outbound lines, so tracking them
> should not be necessary. The other device would do it for or_irq.
There's no mechanism in qemu_irq for the destination end to ask
the source end about its current value. The information flow
is strictly one-way.
thanks
-- PMM
- [Qemu-arm] [PATCH 15/27] iommu: Add IOMMU index argument to notifier APIs, (continued)
- [Qemu-arm] [PATCH 23/27] hw/core/or-irq: Support more than 16 inputs to an OR gate, Peter Maydell, 2018/05/21
- Re: [Qemu-arm] [PATCH 23/27] hw/core/or-irq: Support more than 16 inputs to an OR gate, Paolo Bonzini, 2018/05/21
- Re: [Qemu-arm] [PATCH 23/27] hw/core/or-irq: Support more than 16 inputs to an OR gate, Peter Maydell, 2018/05/21
- Re: [Qemu-arm] [Qemu-devel] [PATCH 23/27] hw/core/or-irq: Support more than 16 inputs to an OR gate, Paolo Bonzini, 2018/05/30
- Re: [Qemu-arm] [Qemu-devel] [PATCH 23/27] hw/core/or-irq: Support more than 16 inputs to an OR gate,
Peter Maydell <=
- Re: [Qemu-arm] [Qemu-devel] [PATCH 23/27] hw/core/or-irq: Support more than 16 inputs to an OR gate, Paolo Bonzini, 2018/05/31
- Re: [Qemu-arm] [Qemu-devel] [PATCH 23/27] hw/core/or-irq: Support more than 16 inputs to an OR gate, Peter Maydell, 2018/05/31
- Re: [Qemu-arm] [Qemu-devel] [PATCH 23/27] hw/core/or-irq: Support more than 16 inputs to an OR gate, Paolo Bonzini, 2018/05/31
- Re: [Qemu-arm] [Qemu-devel] [PATCH 23/27] hw/core/or-irq: Support more than 16 inputs to an OR gate, Peter Maydell, 2018/05/31
[Qemu-arm] [PATCH 21/27] hw/misc/tz_mpc.c: Honour the BLK_LUT settings in translate, Peter Maydell, 2018/05/21
[Qemu-arm] [PATCH 26/27] hw/arm/iotkit: Wire up MPC interrupt lines, Peter Maydell, 2018/05/21
[Qemu-arm] [PATCH 22/27] vmstate.h: Provide VMSTATE_BOOL_SUB_ARRAY, Peter Maydell, 2018/05/21
[Qemu-arm] [PATCH 27/27] hw/arm/mps2-tz.c: Instantiate MPCs, Peter Maydell, 2018/05/21