Patchwork [PULL,28/41] PPC: ePAPR: Fix hypercall on LE guest

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Submitter Alexander Graf
Date May 30, 2014, 12:42 p.m.
Message ID <1401453776-55285-29-git-send-email-agraf@suse.de>
Download mbox | patch
Permalink /patch/354141/
State New
Headers show

Comments

Alexander Graf - May 30, 2014, 12:42 p.m.
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>
---
 arch/powerpc/kernel/epapr_paravirt.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Patch

diff --git a/arch/powerpc/kernel/epapr_paravirt.c b/arch/powerpc/kernel/epapr_paravirt.c
index 7898be9..d9b7935 100644
--- 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
 	}