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Re: [PATCH-for-5.0 1/2] hw/acpi/piix4: Add 'system-hotplug-support' prop

From: Paolo Bonzini
Subject: Re: [PATCH-for-5.0 1/2] hw/acpi/piix4: Add 'system-hotplug-support' property
Date: Mon, 23 Mar 2020 09:05:06 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 22/03/20 17:27, Philippe Mathieu-Daudé wrote:
>> That 'ugly' is typically used within QEMU to deal with such things
>> probably due to its low complexity.
> OK. Can you point me to the documentation for this feature? I can find
> reference of GPE in the ICH9, but I can't find where this IO address on
> the PIIX4 comes from:
> #define GPE_BASE 0xafe0

It's made up.  The implementation is placed in PIIX4_PM because it is
referenced by the ACPI tables.  Real hardware would probably place this
in the ACPI embedded controller or in the BMC.


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