[PATCH V2 2/2] KVM: arm64: Increase number of user memslots to 508

[Linu Cherian]

On Thu, Feb 23, 2017 at 3:44 PM, Christoffer Dall <cdall at linaro.org> wrote:
> On Wed, Feb 08, 2017 at 12:45:41PM +0530, linucherian at gmail.com wrote:
>> From: Linu Cherian <linu.cherian at cavium.com>
>>
>> Having only 32 memslots is a real constraint for the maximum
>> number of PCI devices that can be assigned to a single guest.
>> Assuming each PCI device/virtual function having two memory BAR
>> regions, we could assign only 15 devices/virtual functions to a
>> guest.
>>
>> Hence increase KVM_USER_MEM_SLOTS to 508, so that KVM_MEM_SLOTS_NUM is
>> 512 as done in other archs like x86 and powerpc.
>
> Actually on powerpc they just define KVM_USER_MEM_SLOTS as 512 directly.
>
> On x86 they define them as 509 and have 3 private mem slots.
>
> I don't understand the difference and as far as I can tell we don't have
> any private memslots on arm/arm64, so this is just weird to me.
>

Since the KVM_PRIVATE_MEM_SLOTS was already defined as 4, just kept
it untouched. Should we remove this and keep KVM_USER_MEM_SLOTS as 512 ?