PPC: ePAPR: Fix hypercall on LE guest

We get an array of instructions from the hypervisor via device tree that
we write into a buffer that gets executed whenever we want to make an
ePAPR compliant hypercall.

However, the hypervisor passes us these instructions in BE order which
we have to manually convert to LE when we want to run them in LE mode.

With this fixup in place, I can successfully run LE kernels with KVM
PV enabled on PR KVM.

Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/arch/powerpc/kernel/epapr_paravirt.c b/arch/powerpc/kernel/epapr_paravirt.c
index 7898be90f2dcd013ecec5d17dcb4897e9a1b62f7..d9b79358b833469be1c25d6a55cc4043877341d5 100644 (file)
--- a/arch/powerpc/kernel/epapr_paravirt.c
+++ b/arch/powerpc/kernel/epapr_paravirt.c
@@ -47,9 +47,10 @@ static int __init early_init_dt_scan_epapr(unsigned long node,
                return -1;
 
        for (i = 0; i < (len / 4); i++) {
-               patch_instruction(epapr_hypercall_start + i, insts[i]);
+               u32 inst = be32_to_cpu(insts[i]);
+               patch_instruction(epapr_hypercall_start + i, inst);
 #if !defined(CONFIG_64BIT) || defined(CONFIG_PPC_BOOK3E_64)
-               patch_instruction(epapr_ev_idle_start + i, insts[i]);
+               patch_instruction(epapr_ev_idle_start + i, inst);
 #endif
        }