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Re: [PATCH v5 06/14] vpci/header: implement guest BAR register handlers
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
- Date: Thu, 3 Feb 2022 12:45:00 +0000
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "julien@xxxxxxx" <julien@xxxxxxx>, "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Artem Mygaiev <Artem_Mygaiev@xxxxxxxx>, "jbeulich@xxxxxxxx" <jbeulich@xxxxxxxx>, "andrew.cooper3@xxxxxxxxxx" <andrew.cooper3@xxxxxxxxxx>, "george.dunlap@xxxxxxxxxx" <george.dunlap@xxxxxxxxxx>, "paul@xxxxxxx" <paul@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Rahul Singh <rahul.singh@xxxxxxx>, Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>
- Delivery-date: Thu, 03 Feb 2022 12:45:18 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v5 06/14] vpci/header: implement guest BAR register handlers
Hi, Roger!
>> Also memory decoding needs to be initially disabled when used by
>> guests, in order to prevent the BAR being placed on top of a RAM
>> region. The guest physmap will be different from the host one, so it's
>> possible for BARs to end up placed on top of RAM regions initially
>> until the firmware or OS places them at a suitable address.
> Agree, memory decoding must be disabled
Isn't it already achieved by the toolstack resetting the PCI device
while assigning it to a guest?
Thank you,
Oleksandr
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