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authorPeter Maydell <peter.maydell@linaro.org>2016-10-24 16:26:50 +0100
committerPeter Maydell <peter.maydell@linaro.org>2016-10-24 16:26:50 +0100
commita2519ad1828dd443af9f9c293db18db6d6123762 (patch)
treec5e4ef27965a9ee1b91519316076e6bfad61acc8 /hw/arm/virt.c
parente97da98f1173c764e8fd8d2c84f84ec3bdc87488 (diff)
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>
Diffstat (limited to 'hw/arm/virt.c')
-rw-r--r--hw/arm/virt.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 895446f17c..47ec7ffa73 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -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)