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[PULL,01/17] virt-acpi-build: add always-on property for timer

Message ID 1454525960-12335-2-git-send-email-peter.maydell@linaro.org
State New
Headers show

Commit Message

Peter Maydell Feb. 3, 2016, 6:59 p.m. UTC 
From: Andrew Jones <drjones@redhat.com>

This patch is the ACPI equivalent of "hw/arm/virt: Add always-on
property to the virt board timer". The timer is always on, and
thus setting this informs Linux that it may switch off the periodic
timer. Switching off the periodic timer substantially reduces the
number of interrupts the host needs to inject.

Testing note: AArch64 guests (the only ones currently booting with
ACPI) do not actually need this patch to determine it can turn the
periodic timer off. I therefore used a hacked guest kernel to ensure
this patch works as the equivalent DT patch does.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Shannon Zhao <shannon.zhao@linaro.org>
Message-id: 1453380893-26174-1-git-send-email-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/arm/virt-acpi-build.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 87fbe7c..f6e538f 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -443,7 +443,7 @@  build_gtdt(GArray *table_data, GArray *linker)
     gtdt->secure_el1_flags = ACPI_EDGE_SENSITIVE;
 
     gtdt->non_secure_el1_interrupt = ARCH_TIMER_NS_EL1_IRQ + 16;
-    gtdt->non_secure_el1_flags = ACPI_EDGE_SENSITIVE;
+    gtdt->non_secure_el1_flags = ACPI_EDGE_SENSITIVE | ACPI_GTDT_ALWAYS_ON;
 
     gtdt->virtual_timer_interrupt = ARCH_TIMER_VIRT_IRQ + 16;
     gtdt->virtual_timer_flags = ACPI_EDGE_SENSITIVE;