[Qemu-devel] [PATCH 9/9] spapr_hcall: Add address-translation-mode-on-interrupt resource in H_SET_MODE

[Alexey Kardashevskiy <aik@ozlabs.ru>]

This adds handling of the RESOURCE_ADDR_TRANS_MODE resource from
the H_SET_MODE, for POWER8 (PowerISA 2.07) only.

This defines AIL flags for LPCR special register.

This changes @excp_prefix according to the mode, takes effect in TCG.

This turns support of a new capability PPC2_ISA207S flag for TCG.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
 hw/ppc/spapr_hcall.c     | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 include/hw/ppc/spapr.h   |  5 +++++
 target-ppc/cpu.h         |  4 +++-
 target-ppc/excp_helper.c |  7 +++++--
 4 files changed, 60 insertions(+), 3 deletions(-)

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index 443e2b6..e586c8b 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -740,6 +740,49 @@ static target_ulong h_set_mode_resouce_le(PowerPCCPU *cpu,
     return H_UNSUPPORTED_FLAG;
 }
 
+static target_ulong h_set_mode_resouce_addr_trans_mode(PowerPCCPU *cpu,
+                                                       target_ulong mflags,
+                                                       target_ulong value1,
+                                                       target_ulong value2)
+{
+    CPUState *cs;
+    PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
+    target_ulong prefix;
+
+    if (!(pcc->insns_flags2 & PPC2_ISA207S)) {
+        return H_P2;
+    }
+    if (value1) {
+        return H_P3;
+    }
+    if (value2) {
+        return H_P4;
+    }
+
+    switch (mflags) {
+    case H_SET_MODE_ADDR_TRANS_NONE:
+        prefix = 0;
+        break;
+    case H_SET_MODE_ADDR_TRANS_0001_8000:
+        prefix = 0x18000;
+        break;
+    case H_SET_MODE_ADDR_TRANS_C000_0000_0000_4000:
+        prefix = 0xC000000000004000;
+        break;
+    default:
+        return H_UNSUPPORTED_FLAG;
+    }
+
+    CPU_FOREACH(cs) {
+        CPUPPCState *env = &POWERPC_CPU(cpu)->env;
+
+        set_spr(cs, SPR_LPCR, mflags << LPCR_AIL_SH, LPCR_AIL);
+        env->excp_prefix = prefix;
+    }
+
+    return H_SUCCESS;
+}
+
 static target_ulong h_set_mode(PowerPCCPU *cpu, sPAPREnvironment *spapr,
                                target_ulong opcode, target_ulong *args)
 {
@@ -750,6 +793,10 @@ static target_ulong h_set_mode(PowerPCCPU *cpu, sPAPREnvironment *spapr,
     case H_SET_MODE_RESOURCE_LE:
         ret = h_set_mode_resouce_le(cpu, args[0], args[2], args[3]);
         break;
+    case H_SET_MODE_RESOURCE_ADDR_TRANS_MODE:
+        ret = h_set_mode_resouce_addr_trans_mode(cpu, args[0],
+                                                 args[2], args[3]);
+        break;
     }
 
     return ret;
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 9f8bb89..8a5705a 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -164,6 +164,11 @@ typedef struct sPAPREnvironment {
 #define H_SET_MODE_ENDIAN_BIG    0
 #define H_SET_MODE_ENDIAN_LITTLE 1
 
+/* Flags for H_SET_MODE_RESOURCE_ADDR_TRANS_MODE */
+#define H_SET_MODE_ADDR_TRANS_NONE                  0
+#define H_SET_MODE_ADDR_TRANS_0001_8000             2
+#define H_SET_MODE_ADDR_TRANS_C000_0000_0000_4000   3
+
 /* VASI States */
 #define H_VASI_INVALID    0
 #define H_VASI_ENABLED    1
diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h
index 52baf20..f435d0a 100644
--- a/target-ppc/cpu.h
+++ b/target-ppc/cpu.h
@@ -466,6 +466,8 @@ struct ppc_slb_t {
 #define MSR_LE   0  /* Little-endian mode                           1 hflags */
 
 #define LPCR_ILE (1 << (63-38))
+#define LPCR_AIL      0x01800000      /* Alternate interrupt location */
+#define LPCR_AIL_SH   (63-40)
 
 #define msr_sf   ((env->msr >> MSR_SF)   & 1)
 #define msr_isf  ((env->msr >> MSR_ISF)  & 1)
@@ -1971,7 +1973,7 @@ enum {
                         PPC2_DIVE_ISA206 | PPC2_ATOMIC_ISA206 | \
                         PPC2_FP_CVT_ISA206 | PPC2_FP_TST_ISA206 | \
                         PPC2_BCTAR_ISA207 | PPC2_LSQ_ISA207 | \
-                        PPC2_ALTIVEC_207)
+                        PPC2_ALTIVEC_207 | PPC2_ISA207S)
 };
 
 /*****************************************************************************/
diff --git a/target-ppc/excp_helper.c b/target-ppc/excp_helper.c
index 4fa297d..de32319 100644
--- a/target-ppc/excp_helper.c
+++ b/target-ppc/excp_helper.c
@@ -614,8 +614,11 @@ static inline void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
     if (asrr1 != -1) {
         env->spr[asrr1] = env->spr[srr1];
     }
-    /* If we disactivated any translation, flush TLBs */
-    if (msr & ((1 << MSR_IR) | (1 << MSR_DR))) {
+
+    if (env->spr[SPR_LPCR] & LPCR_AIL) {
+        new_msr |= (1 << MSR_IR) | (1 << MSR_DR);
+    } else if (msr & ((1 << MSR_IR) | (1 << MSR_DR))) {
+        /* If we disactivated any translation, flush TLBs */
         tlb_flush(cs, 1);
     }
 
-- 
1.9.rc0