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Re: [Xen-devel] [PATCH for 4.13] x86/shim: don't reserve 640k - 1M region in E820
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- Date: Tue, 29 Oct 2019 10:40:15 +0000
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- Cc: Juergen Gross <jgross@xxxxxxxx>, "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxx
- Delivery-date: Tue, 29 Oct 2019 10:40:34 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 29/10/2019 10:19, Andrew Cooper wrote:
> On 29/10/2019 10:17, Sergey Dyasli wrote:
>> On 28/10/2019 11:33, Andrew Cooper wrote:
>>> For now, how about cpu_has_hypervisor ?
>>>
>>> Whatever the virtual environment, we should trust the provided memory map.
>> Unfortunately, this plan has failed: init_e820() is called way before
>> early_cpu_init() and testing cpu_has_hypervisor is meaningless there.
>>
>> I guess I'll go for !pvh_boot check for now.
>
> Opencode it with cpuid_ecx(1) for now, as we've done elsewhere.
>
> I've got a patch in my not-progressing-very-quickly series to remove the
> boot time mapping at 0 which cleans up early CPUID handling so this can
> turn into cpu_has_hypervisor, but that is definitely post-4.13 material
> right now.
Looking closely at early_cpu_init(), I don't see anything there that
would prevent placing it near the top of __start_xen(). It works for
pv-shim, but I need to also do some bare metal testing with this change.
Do you know of anything that would prevent it?
--
Thanks,
Sergey
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