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hw/arm/virt: Add always-on property to the virt board timer

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The virt board has an arch timer, which is always on.  Emit the
"always-on" property to indicate to Linux that it can switch off the
periodic timer and reduces the amount of interrupts injected into a
guest.

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Message-id: 1453204158-11412-1-git-send-email-christoffer.dall@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Christoffer Dall 2016-01-21 14:15:07 +00:00 committed by Peter Maydell
parent 3df708eb48
commit caa49adbcc
1 changed files with 1 additions and 0 deletions
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hw/arm/virt.c
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@ -293,6 +293,7 @@ static void fdt_add_timer_nodes(const VirtBoardInfo *vbi, int gictype)
qemu_fdt_setprop_string(vbi->fdt, "/timer", "compatible",
"arm,armv7-timer");
}
qemu_fdt_setprop(vbi->fdt, "/timer", "always-on", NULL, 0);
qemu_fdt_setprop_cells(vbi->fdt, "/timer", "interrupts",
GIC_FDT_IRQ_TYPE_PPI, ARCH_TIMER_S_EL1_IRQ, irqflags,
GIC_FDT_IRQ_TYPE_PPI, ARCH_TIMER_NS_EL1_IRQ, irqflags,