[Xen-devel] [PATCH 09/13] xen: arm: Set EL1 register width in HCR_EL2 during context switch.

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/domain.c           |    7 +++++++
 xen/include/asm-arm/processor.h |    3 +++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index 08bb132..20bb6c7 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -203,6 +203,13 @@ static void ctxt_switch_to(struct vcpu *n)
 
     isb();
 
+#ifdef CONFIG_ARM_64
+    if ( is_pv32_domain(n->domain) )
+        hcr &= ~HCR_RW;
+    else
+        hcr |= HCR_RW;
+#endif
+
     WRITE_SYSREG(hcr, HCR_EL2);
     isb();
 
diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
index 1681ebf..32c441b 100644
--- a/xen/include/asm-arm/processor.h
+++ b/xen/include/asm-arm/processor.h
@@ -41,6 +41,9 @@
 #define HSCTLR_BASE       0x30c51878
 
 /* HCR Hyp Configuration Register */
+#ifdef CONFIG_ARM_64
+#define HCR_RW          (1<<31)
+#endif
 #define HCR_TGE         (1<<27)
 #define HCR_TVM         (1<<26)
 #define HCR_TTLB        (1<<25)
-- 
1.7.2.5


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