[Xen-devel] [PATCH v4 02/19] xen/arm: Introduce a helper to get default HCR_EL2 flags

[Wei Chen <Wei.Chen@xxxxxxx>]

We want to add HCR_EL2 register to Xen context switch. And each copy
of HCR_EL2 in vcpu structure will be initialized with the same set
of trap flags as the HCR_EL2 register. We introduce a helper here to
represent these flags to be reused easily.

Signed-off-by: Wei Chen <Wei.Chen@xxxxxxx>
Reviewed-by: Julien Grall <julien.grall@xxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
 xen/arch/arm/traps.c            | 11 ++++++++---
 xen/include/asm-arm/processor.h |  2 ++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c
index f7fca37..ebe25c6 100644
--- a/xen/arch/arm/traps.c
+++ b/xen/arch/arm/traps.c
@@ -136,6 +136,13 @@ static int __init vwfi_init(void)
 }
 presmp_initcall(vwfi_init);
 
+register_t get_default_hcr_flags(void)
+{
+    return  (HCR_PTW|HCR_BSU_INNER|HCR_AMO|HCR_IMO|HCR_FMO|HCR_VM|
+             (vwfi != NATIVE ? (HCR_TWI|HCR_TWE) : 0) |
+             HCR_TSC|HCR_TAC|HCR_SWIO|HCR_TIDCP|HCR_FB);
+}
+
 void init_traps(void)
 {
     /* Setup Hyp vector base */
@@ -160,9 +167,7 @@ void init_traps(void)
                  CPTR_EL2);
 
     /* Setup hypervisor traps */
-    WRITE_SYSREG(HCR_PTW|HCR_BSU_INNER|HCR_AMO|HCR_IMO|HCR_FMO|HCR_VM|
-                 (vwfi != NATIVE ? (HCR_TWI|HCR_TWE) : 0) |
-                 HCR_TSC|HCR_TAC|HCR_SWIO|HCR_TIDCP|HCR_FB,HCR_EL2);
+    WRITE_SYSREG(get_default_hcr_flags(), HCR_EL2);
     isb();
 }
 
diff --git a/xen/include/asm-arm/processor.h b/xen/include/asm-arm/processor.h
index afc0e9a..4b6338b 100644
--- a/xen/include/asm-arm/processor.h
+++ b/xen/include/asm-arm/processor.h
@@ -708,6 +708,8 @@ int call_smc(register_t function_id, register_t arg0, 
register_t arg1,
 
 void do_trap_guest_error(struct cpu_user_regs *regs);
 
+register_t get_default_hcr_flags(void);
+
 #endif /* __ASSEMBLY__ */
 #endif /* __ASM_ARM_PROCESSOR_H */
 /*
-- 
2.7.4


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