Re: [Xen-devel] [PATCH v5 07/12] x86/hyperv: setup hypercall page

[Jan Beulich <jbeulich@xxxxxxxx>]

On 30.01.2020 12:47, Wei Liu wrote:
> On Thu, Jan 30, 2020 at 12:39:47PM +0100, Roger Pau Monné wrote:
>> I think what you need is a hook that modifies the memory map and adds
>> a reserved region at ((1 << paddr_bits) - PAGE_SIZE) of size
>> PAGE_SIZE. See where pv_shim_fixup_e820 is used, and I think you want
>> to make this a hypervisor hook and add the HyperV code to reserve the
>> hypercall page in the e820 there.
> 
> That works for me too. Let's see what other people think.

The idea lgtm, pending seeing it actually carried out.

Jan

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