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Re: [PATCH V3 01/19] x86: Create per-domain mapping of guest_root_pt
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 14 May 2024 10:03:31 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, julien@xxxxxxx, pdurrant@xxxxxxxxxx, dwmw@xxxxxxxxxx, Hongyan Xia <hongyxia@xxxxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Elias El Yandouzi <eliasely@xxxxxxxxxx>
- Delivery-date: Tue, 14 May 2024 08:03:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.05.2024 17:27, Roger Pau Monné wrote:
> On Mon, May 13, 2024 at 11:10:59AM +0000, Elias El Yandouzi wrote:
>> @@ -317,6 +317,14 @@ extern unsigned long xen_phys_start;
>> #define ARG_XLAT_START(v) \
>> (ARG_XLAT_VIRT_START + ((v)->vcpu_id << ARG_XLAT_VA_SHIFT))
>>
>> +/* pv_root_pt mapping area. The fourth per-domain-mapping sub-area */
>> +#define PV_ROOT_PT_MAPPING_VIRT_START PERDOMAIN_VIRT_SLOT(3)
>> +#define PV_ROOT_PT_MAPPING_ENTRIES MAX_VIRT_CPUS
>> +
>> +/* The address of a particular VCPU's PV_ROOT_PT */
>> +#define PV_ROOT_PT_MAPPING_VCPU_VIRT_START(v) \
>> + (PV_ROOT_PT_MAPPING_VIRT_START + ((v)->vcpu_id * PAGE_SIZE))
>
> I know we are not there yet, but I wonder if we need to start having
> some non-shared per-cpu mapping area in the page-tables. Right now
> this is shared between all the vCPUs, as it's per-domain space
> (instead of per-vCPU).
In turn requiring per-vCPU page tables, posing a problem when a guest
uses the same page tables for multiple vCPU-s.
Jan
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