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hw/arm/virt: Set minimum_page_bits to 12 

Since the virt board model will never create a CPU which is
pre-ARMv7, we know that our minimum page size is 4K and can
set minimum_page_bits accordingly, for improved performance.

Note that this is a migration compatibility break, so
we introduce it only for the virt-2.8 machine and onward;
virt-2.7 continues using the old 1K pages.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Peter Maydell 2016-10-24 16:26:50 +01:00
parent e97da98f11
commit a2519ad182
1 changed files with 4 additions and 0 deletions
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4
hw/arm/virt.c
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@ -1499,6 +1499,8 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
mc->block_default_type = IF_VIRTIO;
mc->no_cdrom = 1;
mc->pci_allow_0_address = true;
/* We know we will never create a pre-ARMv7 CPU which needs 1K pages */
mc->minimum_page_bits = 12;
}
static const TypeInfo virt_machine_info = {
@ -1570,6 +1572,8 @@ static void virt_machine_2_7_options(MachineClass *mc)
SET_MACHINE_COMPAT(mc, VIRT_COMPAT_2_7);
/* ITS was introduced with 2.8 */
vmc->no_its = true;
/* Stick with 1K pages for migration compatibility */
mc->minimum_page_bits = 0;
}
DEFINE_VIRT_MACHINE(2, 7)