[Xen-changelog] [xen staging] xen/arm: Introduce helpers to clear/flags flags in HCR_EL2

[patchbot@xxxxxxx]

commit f5613b83311fba8986014ee5714f6ebc8b74fc68
Author:     Julien Grall <julien.grall@xxxxxxx>
AuthorDate: Wed Feb 21 14:18:44 2018 +0000
Commit:     Julien Grall <julien.grall@xxxxxxx>
CommitDate: Wed Dec 12 15:48:46 2018 +0000

    xen/arm: Introduce helpers to clear/flags flags in HCR_EL2
    
    A couple of places in the code will need to clear/set flags in HCR_EL2
    for a given vCPU and then replicate into the hardware. Introduce
    helpers and replace open-coded version.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/traps.c            |  3 +--
 xen/include/asm-arm/processor.h | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index 88ffeeb480..c05a8ad25c 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -681,8 +681,7 @@ static void inject_vabt_exception(struct cpu_user_regs 
*regs)
         break;
     }
 
-    current->arch.hcr_el2 |= HCR_VA;
-    WRITE_SYSREG(current->arch.hcr_el2, HCR_EL2);
+    vcpu_hcr_set_flags(current, HCR_VA);
 }
 
 /*
diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
index 72ddc42778..cb781751a6 100644
--- a/xen/include/asm-arm/processor.h
+++ b/xen/include/asm-arm/processor.h
@@ -490,6 +490,24 @@ register_t get_default_hcr_flags(void);
                                  : : : "memory");                 \
     } while (0)
 
+/*
+ * Clear/Set flags in HCR_EL2 for a given vCPU. It only supports the current
+ * vCPU for now.
+ */
+#define vcpu_hcr_clear_flags(v, flags)              \
+    do {                                            \
+        ASSERT((v) == current);                     \
+        (v)->arch.hcr_el2 &= ~(flags);              \
+        WRITE_SYSREG((v)->arch.hcr_el2, HCR_EL2);   \
+    } while (0)
+
+#define vcpu_hcr_set_flags(v, flags)                \
+    do {                                            \
+        ASSERT((v) == current);                     \
+        (v)->arch.hcr_el2 |= (flags);               \
+        WRITE_SYSREG((v)->arch.hcr_el2, HCR_EL2);   \
+    } while (0)
+
 #endif /* __ASSEMBLY__ */
 #endif /* __ASM_ARM_PROCESSOR_H */
 /*
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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