[Xen-devel] [PATCH] xen: arm: Enable 1:1 workaround by default

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

I was just about to send out patches adding the 1:1 workaround to vexpress (the
foundation model is a vexpress platfrom with DMA) and sunxi.

That would have meant that all platforms now implement the quirk. Instead lets
just make it the default and remove the quirk.

In the future this will likely be set based on the presence absence of an
IOMMU, perhaps with additional overrides by the platform.

A command line option no-dom0_11_mapping is provided.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c      | 5 ++++-
 xen/arch/arm/platforms/exynos5.c | 6 ------
 xen/arch/arm/platforms/midway.c  | 6 ------
 xen/arch/arm/platforms/omap5.c   | 6 ------
 xen/include/asm-arm/platform.h   | 6 ------
 5 files changed, 4 insertions(+), 25 deletions(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index e9bb01f..ed22613 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -22,6 +22,9 @@
 static unsigned int __initdata opt_dom0_max_vcpus;
 integer_param("dom0_max_vcpus", opt_dom0_max_vcpus);
 
+static int opt_dom0_11_mapping = 1;
+boolean_param("dom0_11_mapping", opt_dom0_11_mapping);
+
 #define DOM0_MEM_DEFAULT 0x8000000 /* 128 MiB */
 static u64 __initdata dom0_mem = DOM0_MEM_DEFAULT;
 
@@ -110,7 +113,7 @@ static void allocate_memory(struct domain *d, struct 
kernel_info *kinfo)
     u32 reg_len, reg_size;
     unsigned int bank = 0;
 
-    if ( platform_has_quirk(PLATFORM_QUIRK_DOM0_MAPPING_11) )
+    if ( opt_dom0_11_mapping )
         return allocate_memory_11(d, kinfo);
 
     while ( (memory = dt_find_node_by_type(memory, "memory")) )
diff --git a/xen/arch/arm/platforms/exynos5.c b/xen/arch/arm/platforms/exynos5.c
index 0e76cac..fa6b465 100644
--- a/xen/arch/arm/platforms/exynos5.c
+++ b/xen/arch/arm/platforms/exynos5.c
@@ -111,11 +111,6 @@ static void exynos5_reset(void)
     iounmap(pmu);
 }
 
-static uint32_t exynos5_quirks(void)
-{
-    return PLATFORM_QUIRK_DOM0_MAPPING_11;
-}
-
 static const char * const exynos5_dt_compat[] __initconst =
 {
     "samsung,exynos5250",
@@ -139,7 +134,6 @@ PLATFORM_START(exynos5, "SAMSUNG EXYNOS5")
     .smp_init = exynos5_smp_init,
     .cpu_up = exynos5_cpu_up,
     .reset = exynos5_reset,
-    .quirks = exynos5_quirks,
     .blacklist_dev = exynos5_blacklist_dev,
 PLATFORM_END
 
diff --git a/xen/arch/arm/platforms/midway.c b/xen/arch/arm/platforms/midway.c
index 399056b..b221279 100644
--- a/xen/arch/arm/platforms/midway.c
+++ b/xen/arch/arm/platforms/midway.c
@@ -42,11 +42,6 @@ static void midway_reset(void)
     iounmap(pmu);
 }
 
-static uint32_t midway_quirks(void)
-{
-    return PLATFORM_QUIRK_DOM0_MAPPING_11;
-}
-
 static const char * const midway_dt_compat[] __initconst =
 {
     "calxeda,ecx-2000",
@@ -56,7 +51,6 @@ static const char * const midway_dt_compat[] __initconst =
 PLATFORM_START(midway, "CALXEDA MIDWAY")
     .compatible = midway_dt_compat,
     .reset = midway_reset,
-    .quirks = midway_quirks,
 PLATFORM_END
 
 /*
diff --git a/xen/arch/arm/platforms/omap5.c b/xen/arch/arm/platforms/omap5.c
index 54fa5ff..3a3b16b 100644
--- a/xen/arch/arm/platforms/omap5.c
+++ b/xen/arch/arm/platforms/omap5.c
@@ -153,11 +153,6 @@ static int __init omap5_cpu_up(int cpu)
     return 0;
 }
 
-static uint32_t omap5_quirks(void)
-{
-    return PLATFORM_QUIRK_DOM0_MAPPING_11;
-}
-
 static const char const *omap5_dt_compat[] __initconst =
 {
     "ti,omap5",
@@ -170,7 +165,6 @@ PLATFORM_START(omap5, "TI OMAP5")
     .specific_mapping = omap5_specific_mapping,
     .smp_init = omap5_smp_init,
     .cpu_up = omap5_cpu_up,
-    .quirks = omap5_quirks,
 PLATFORM_END
 
 /*
diff --git a/xen/include/asm-arm/platform.h b/xen/include/asm-arm/platform.h
index c282b30..6d108e7 100644
--- a/xen/include/asm-arm/platform.h
+++ b/xen/include/asm-arm/platform.h
@@ -39,12 +39,6 @@ struct platform_desc {
     const struct dt_device_match *blacklist_dev;
 };
 
-/*
- * Quirk to map dom0 memory in 1:1
- * Useful on platform where System MMU is not yet implemented
- */
-#define PLATFORM_QUIRK_DOM0_MAPPING_11 (1 << 0)
-
 void __init platform_init(void);
 int __init platform_init_time(void);
 int __init platform_specific_mapping(struct domain *d);
-- 
1.8.4.rc3


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