Now that we have both the old VGIC prepared to cope with a sibling and
the code for the new VGIC in place, lets add a Kconfig option to enable
the new code and wire it into the Xen build system.
This will add a compile time option to use either the "old" or the "new"
VGIC.
In the moment this is restricted to a vGIC-v2. To make the build system
happy, we provide a temporary dummy implementation of
vgic_v3_setup_hw() to allow building for now.
Signed-off-by: Andre Przywara <andre.przyw...@linaro.org>
---
Changelog v3 ... v3a:
- print panic when trying to run on GICv3 hardware
Changelog v2 ... v3:
- fix indentation of Kconfig entry
- select NEEDS_LIST_SORT
- drop unconditional list_sort.o inclusion
Changelog v1 ... v2:
- add Kconfig help text
- use separate Makefile in vgic/ directory
- protect compilation without GICV3 support
- always include list_sort() in build
xen/arch/arm/Kconfig | 18 +++++++++++++++++-
xen/arch/arm/Makefile | 5 ++++-
xen/arch/arm/vgic/Makefile | 5 +++++
xen/arch/arm/vgic/vgic.c | 11 +++++++++++
4 files changed, 37 insertions(+), 2 deletions(-)
create mode 100644 xen/arch/arm/vgic/Makefile
diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index 2782ee6589..8174c0c635 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -48,7 +48,23 @@ config HAS_GICV3
config HAS_ITS
bool
prompt "GICv3 ITS MSI controller support" if EXPERT = "y"
- depends on HAS_GICV3
+ depends on HAS_GICV3 && !NEW_VGIC
+
+config NEW_VGIC
+ bool
+ prompt "Use new VGIC implementation"
+ select NEEDS_LIST_SORT
+ ---help---
+
+ This is an alternative implementation of the ARM GIC interrupt
+ controller emulation, based on the Linux/KVM VGIC. It has a better
+ design and fixes many shortcomings of the existing GIC emulation in
+ Xen. It will eventually replace the existing/old VGIC.
+ However at the moment it lacks support for Dom0 using the ITS for
+ using MSIs.
+ Say Y if you want to help testing this new code or if you experience
+ problems with the standard emulation.
+ At the moment this implementation is not security supported.
config SBSA_VUART_CONSOLE
bool "Emulated SBSA UART console support"
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 41d7366527..a9533b107e 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -16,7 +16,6 @@ obj-y += domain_build.o
obj-y += domctl.o
obj-$(EARLY_PRINTK) += early_printk.o
obj-y += gic.o
-obj-y += gic-vgic.o
obj-y += gic-v2.o
obj-$(CONFIG_HAS_GICV3) += gic-v3.o
obj-$(CONFIG_HAS_ITS) += gic-v3-its.o
@@ -47,10 +46,14 @@ obj-y += sysctl.o
obj-y += time.o
obj-y += traps.o
obj-y += vcpreg.o
+subdir-$(CONFIG_NEW_VGIC) += vgic
+ifneq ($(CONFIG_NEW_VGIC),y)
+obj-y += gic-vgic.o
obj-y += vgic.o
obj-y += vgic-v2.o
obj-$(CONFIG_HAS_GICV3) += vgic-v3.o
obj-$(CONFIG_HAS_ITS) += vgic-v3-its.o
+endif
obj-y += vm_event.o
obj-y += vtimer.o
obj-$(CONFIG_SBSA_VUART_CONSOLE) += vpl011.o
diff --git a/xen/arch/arm/vgic/Makefile b/xen/arch/arm/vgic/Makefile
new file mode 100644
index 0000000000..806826948e
--- /dev/null
+++ b/xen/arch/arm/vgic/Makefile
@@ -0,0 +1,5 @@
+obj-y += vgic.o
+obj-y += vgic-v2.o
+obj-y += vgic-mmio.o
+obj-y += vgic-mmio-v2.o
+obj-y += vgic-init.o
diff --git a/xen/arch/arm/vgic/vgic.c b/xen/arch/arm/vgic/vgic.c
index f9a5088285..ac18cab6f3 100644
--- a/xen/arch/arm/vgic/vgic.c
+++ b/xen/arch/arm/vgic/vgic.c
@@ -981,6 +981,17 @@ unsigned int vgic_max_vcpus(const struct domain *d)
return min_t(unsigned int, MAX_VIRT_CPUS, vgic_vcpu_limit);
}
+#ifdef CONFIG_HAS_GICV3
+/* Dummy implementation to allow building without actual vGICv3 support. */
+void vgic_v3_setup_hw(paddr_t dbase,
+ unsigned int nr_rdist_regions,
+ const struct rdist_region *regions,
+ unsigned int intid_bits)
+{
+ panic("New VGIC implementation does not yet support GICv3.");
+}
+#endif
+
/*
* Local variables:
* mode: C
--
2.14.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
