[Qemu-devel] Re: comments on: get page size in device init

[Blue Swirl <blauwirbel@gmail.com>]

On Wed, Sep 23, 2009 at 10:13 PM, Michael S. Tsirkin <mst@redhat.com> wrote:
> On Wed, Sep 23, 2009 at 10:03:26PM +0300, Blue Swirl wrote:
>> On Wed, Sep 23, 2009 at 9:40 PM, Michael S. Tsirkin <mst@redhat.com> wrote:
>> > On Wed, Sep 23, 2009 at 01:02:56PM -0500, Anthony Liguori wrote:
>> >> Blue Swirl wrote:
>> >>> On Wed, Sep 23, 2009 at 3:58 PM, Michael S. Tsirkin <mst@redhat.com> wrote:
>> >>>
>> >>>>>     Compile msix only once
>> >>>>>
>> >>>>>     Get page size in device init.
>> >>>>>
>> >>>>>     Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
>> >>>>>
>> >>>> What was the motivation for the page size change?
>> >>>>
>> >>>
>> >>> "Compile msix only once"
>> >>>
>> >>>
>> >>>> It seems the only user passes TARGET_PAGE_SIZE anyway,
>> >>>> using a constant seems clearer and probably generates
>> >>>> less code. No?
>> >>>>
>> >>>
>> >>> Yes, but then the code would depend on TARGET_PAGE_SIZE, making it
>> >>> impossible to compile the code only once.
>> >>>
>> >>
>> >> We could probably get away with doing
>> >>
>> >> #define TARGET_PAGE_SIZE target_get_page_size()
>> >>
>> >> And take care of a big chunk of this without passing page size
>> >> parameters around.
>> >
>> >
>> > Sounds good.
>>
>> That would work and target_get_page_size() together with
>> get_ram_size() would also handle the virtio case nicely, except for
>> the if (!kvm_enabled() || kvm_has_sync_mmu()) part.
>
> Where's get_ram_size needed?

In virtio-balloon.