[PATCH v4 17/19] hw/arm/smmuv3: Support and advertise nesting

[Mostafa Saleh <smostafa@google.com>]

Everything is in place, consolidate parsing of STE cfg and setting
translation stage.

Advertise nesting if stage requested is "nested".

Signed-off-by: Mostafa Saleh <smostafa@google.com>
---
 hw/arm/smmuv3.c | 35 ++++++++++++++++++++++++++---------
 1 file changed, 26 insertions(+), 9 deletions(-)

diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index 6c18dc0acf..807f26f2da 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -261,6 +261,9 @@ static void smmuv3_init_regs(SMMUv3State *s)
     /* Based on sys property, the stages supported in smmu will be advertised.*/
     if (s->stage && !strcmp("2", s->stage)) {
         s->idr[0] = FIELD_DP32(s->idr[0], IDR0, S2P, 1);
+    } else if (s->stage && !strcmp("nested", s->stage)) {
+        s->idr[0] = FIELD_DP32(s->idr[0], IDR0, S1P, 1);
+        s->idr[0] = FIELD_DP32(s->idr[0], IDR0, S2P, 1);
     } else {
         s->idr[0] = FIELD_DP32(s->idr[0], IDR0, S1P, 1);
     }
@@ -425,8 +428,6 @@ static bool s2_pgtable_config_valid(uint8_t sl0, uint8_t t0sz, uint8_t gran)
 
 static int decode_ste_s2_cfg(SMMUTransCfg *cfg, STE *ste)
 {
-    cfg->stage = SMMU_STAGE_2;
-
     if (STE_S2AA64(ste) == 0x0) {
         qemu_log_mask(LOG_UNIMP,
                       "SMMUv3 AArch32 tables not supported\n");
@@ -509,6 +510,27 @@ bad_ste:
     return -EINVAL;
 }
 
+static void decode_ste_config(SMMUTransCfg *cfg, uint32_t config)
+{
+
+    if (STE_CFG_ABORT(config)) {
+        cfg->aborted = true;
+        return;
+    }
+    if (STE_CFG_BYPASS(config)) {
+        cfg->bypassed = true;
+        return;
+    }
+
+    if (STE_CFG_S1_ENABLED(config)) {
+        cfg->stage = SMMU_STAGE_1;
+    }
+
+    if (STE_CFG_S2_ENABLED(config)) {
+        cfg->stage |= SMMU_STAGE_2;
+    }
+}
+
 /* Returns < 0 in case of invalid STE, 0 otherwise */
 static int decode_ste(SMMUv3State *s, SMMUTransCfg *cfg,
                       STE *ste, SMMUEventInfo *event)
@@ -525,13 +547,9 @@ static int decode_ste(SMMUv3State *s, SMMUTransCfg *cfg,
 
     config = STE_CONFIG(ste);
 
-    if (STE_CFG_ABORT(config)) {
-        cfg->aborted = true;
-        return 0;
-    }
+    decode_ste_config(cfg, config);
 
-    if (STE_CFG_BYPASS(config)) {
-        cfg->bypassed = true;
+    if (cfg->aborted || cfg->bypassed) {
         return 0;
     }
 
@@ -704,7 +722,6 @@ static int decode_cd(SMMUv3State *s, SMMUTransCfg *cfg,
 
     /* we support only those at the moment */
     cfg->aa64 = true;
-    cfg->stage = SMMU_STAGE_1;
 
     cfg->oas = oas2bits(CD_IPS(cd));
     cfg->oas = MIN(oas2bits(SMMU_IDR5_OAS), cfg->oas);
-- 
2.45.2.803.g4e1b14247a-goog