[xen staging-4.15] xen/arm32: SPSR_hyp/SPSR

[patchbot@xxxxxxx]

commit 61dea454ba87d4f5c2b900e6dff4f72805d3198c
Author:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
AuthorDate: Wed Jun 9 10:37:59 2021 -0700
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Fri Jul 16 13:07:34 2021 -0700

    xen/arm32: SPSR_hyp/SPSR
    
    SPSR_hyp is not meant to be accessed from Hyp mode (EL2); accesses
    trigger UNPREDICTABLE behaviour. Xen should read/write SPSR instead.
    See: ARM DDI 0487D.b page G8-5993.
    
    This fixes booting Xen/arm32 on QEMU.
    
    Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
    Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>
    Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xxxxxxxxxx>
    Tested-by: Edgar E. Iglesias <edgar.iglesias@xxxxxxxxxx>
    (cherry picked from commit dfcffb128be46a3e413eaa941744536fe53c94b6)
---
 xen/arch/arm/arm32/entry.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/arch/arm/arm32/entry.S b/xen/arch/arm/arm32/entry.S
index b228d44b19..8d1327ffe4 100644
--- a/xen/arch/arm/arm32/entry.S
+++ b/xen/arch/arm/arm32/entry.S
@@ -171,7 +171,7 @@ ENDPROC(prepare_context_from_guest)
         mrc     CP32(r11, HSR)                 /* Save exception syndrome */
         str     r11, [sp, #UREGS_hsr]
 
-        mrs     r11, SPSR_hyp
+        mrs     r11, SPSR
         str     r11, [sp, #UREGS_cpsr]
 
         /*
@@ -396,7 +396,7 @@ return_to_hypervisor:
         ldr r11, [sp, #UREGS_pc]
         msr ELR_hyp, r11
         ldr r11, [sp, #UREGS_cpsr]
-        msr SPSR_hyp, r11
+        msr SPSR, r11
 #ifdef CONFIG_ARM32_HARDEN_BRANCH_PREDICTOR
         /*
          * Hardening branch predictor may require to setup a different
--
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