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Re: [PATCH v3] x86/hyperv: use dynamically allocated page for hypercalls
- To: Ariadne Conill <ariadne@ariadne.space>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jason Andryuk <jason.andryuk@xxxxxxx>
- Date: Mon, 28 Apr 2025 17:10:13 -0400
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- Cc: Paul Durrant <paul@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, "Andrew Cooper" <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Alejandro Vallejo <agarciav@xxxxxxx>, "Alexander M . Merritt" <alexander@xxxxxxxxx>
- Delivery-date: Mon, 28 Apr 2025 21:10:29 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 2025-04-28 15:57, Ariadne Conill wrote:
Previously Xen placed the hypercall page at the highest possible MFN,
but this caused problems on systems where there is more than 36 bits
of physical address space.
In general, it also seems unreliable to assume that the highest possible
MFN is not already reserved for some other purpose.
Fixes: 620fc734f854 ("x86/hyperv: setup hypercall page")
Cc: Alejandro Vallejo <agarciav@xxxxxxx>
Cc: Alexander M. Merritt <alexander@xxxxxxxxx>
Signed-off-by: Ariadne Conill <ariadne@ariadne.space>
Reviewed-by: Jason Andryuk <jason.andryuk@xxxxxxx>
Thanks,
Jason
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