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Re: [Qemu-devel] [RFC PATCH v1 1/2] target-arm: Update page size for aar

From: Peter Maydell
Subject: Re: [Qemu-devel] [RFC PATCH v1 1/2] target-arm: Update page size for aarch64
Date: Mon, 4 Apr 2016 17:44:28 +0100

On 4 April 2016 at 17:40, Vijay Kilari <address@hidden> wrote:
> On Mon, Apr 4, 2016 at 7:14 PM, Peter Maydell <address@hidden> wrote:
>> I agree that this would definitely improve performance (both for
>> migration and for emulated guests), but I'm afraid this breaks
>> running 32-bit ARMv5 and ARMv7M guests with this QEMU binary,
>> so we can't do this. If we want to allow the minimum page size to
>> be bigger than 1K for AArch64 CPUs then we need to make it a
>> runtime settable thing rather than compile-time (which is not
>> an entirely trivial thing).
> Do you mean to say that based on -cpu type qemu option
> choose the page size at runtime?

If you want to avoid defining TARGET_PAGE_SIZE to the
lowest-common-denominator 1K, then yes, you'd need to
choose it at runtime. That could be painful to implement.

-- PMM

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