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Re: [Xen-devel] [PATCH] xen: setup pv irq ops vector earlier
- To: Juergen Gross <jgross@xxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, x86@xxxxxxxxxx
- From: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Date: Wed, 11 Jul 2018 11:31:33 -0400
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- Cc: tglx@xxxxxxxxxxxxx, mingo@xxxxxxxxxx, stable@xxxxxxxxxxxxxxx, hpa@xxxxxxxxx
- Delivery-date: Wed, 11 Jul 2018 15:31:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 07/11/2018 01:08 AM, Juergen Gross wrote:
> On 11/07/18 00:26, Boris Ostrovsky wrote:
>> On 07/02/2018 06:00 AM, Juergen Gross wrote:
>>> Setting pv_irq_ops for Xen PV domains should be done as early as
>>> possible in order to support e.g. very early printk() usage.
>> Will printk() work as result of this move? We still, for example,
>> haven't set up console.
> It will print to the kernel print buffer, so the output will be
> available later.
Right, haven't thought about it.
>
>> This will (probably) allow us not to crash (due to STI and such) but I
>> am not sure "support" is the right term here.
> Not crashing is big plus IMO. :-)
Actually, no, this is not sufficient.
You need to move xen_vcpu_info_reset(0) up as well. Otherwise you will
not be able to dereference the percpu xen_vcpu in xen_save_fl().
-boris
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