[Qemu-devel] [PATCH v3] spapr-rtas: fix h_rtas parameters reading

[Alexey Kardashevskiy <aik@ozlabs.ru>]

On the real hardware, RTAS is called in real mode and therefore
top 4 bits of the address passed in the call are ignored.
So does the patch.

This converts h_rtas() to use existing rtas_ld() handlers.

This fixed rtas_ld()/rtas_st() to ignore top 4 bits.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
Changes:
v3:
* ldl_be_phys() replaced with rtas_ld() which is already there
* rtas_ld()/rtas_st() fixed to chop top 4 bits

v2:
* masking from replaced with the use of cpu_ldl_data which can handle
realmode case properly
---
 hw/ppc/spapr_hcall.c   | 6 +++---
 include/hw/ppc/spapr.h | 9 +++++++--
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index b3bc2ea..7f07409 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -523,9 +523,9 @@ static target_ulong h_rtas(PowerPCCPU *cpu, sPAPREnvironment *spapr,
                            target_ulong opcode, target_ulong *args)
 {
     target_ulong rtas_r3 = args[0];
-    uint32_t token = ldl_be_phys(rtas_r3);
-    uint32_t nargs = ldl_be_phys(rtas_r3 + 4);
-    uint32_t nret = ldl_be_phys(rtas_r3 + 8);
+    uint32_t token = rtas_ld(rtas_r3, 0);
+    uint32_t nargs = rtas_ld(rtas_r3, 1);
+    uint32_t nret = rtas_ld(rtas_r3, 2);
 
     return spapr_rtas_call(cpu, spapr, token, nargs, rtas_r3 + 12,
                            nret, rtas_r3 + 12 + 4*nargs);
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 8c1d4a2..3731262 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -340,14 +340,19 @@ static inline int spapr_allocate_lsi(int hint)
     return spapr_allocate_irq(hint, true);
 }
 
+static inline uint64_t ppc64_phys_to_real(uint64_t addr)
+{
+    return addr & ~0xF000000000000000ULL;
+}
+
 static inline uint32_t rtas_ld(target_ulong phys, int n)
 {
-    return ldl_be_phys(phys + 4*n);
+    return ldl_be_phys(ppc64_phys_to_real(phys + 4*n));
 }
 
 static inline void rtas_st(target_ulong phys, int n, uint32_t val)
 {
-    stl_be_phys(phys + 4*n, val);
+    stl_be_phys(ppc64_phys_to_real(phys + 4*n), val);
 }
 
 typedef void (*spapr_rtas_fn)(PowerPCCPU *cpu, sPAPREnvironment *spapr,
-- 
1.8.4.rc4