[v3,18/20] target/arm: Move device detection earlier in get_phys_addr_lpae

Commit Message

Richard Henderson Oct. 9, 2024, 12:04 a.m. UTC

Determine cache attributes, and thence Device vs Normal memory,
earlier in the function.  We have an existing regime_is_stage2
if block into which this can be slotted.

Reviewed-by: Peter Maydell <[e-mail]>
Signed-off-by: Richard Henderson <[e-mail]>
---
 target/arm/ptw.c | 49 ++++++++++++++++++++++++------------------------
 1 file changed, 25 insertions(+), 24 deletions(-)

Patch

diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index 238b2c92a9..0a1a820362 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -2029,8 +2029,20 @@  static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
             xn = extract64(attrs, 53, 2);
             result->f.prot = get_S2prot(env, ap, xn, ptw->in_s1_is_el0);
         }
+
+        result->cacheattrs.is_s2_format = true;
+        result->cacheattrs.attrs = extract32(attrs, 2, 4);
+        /*
+         * Security state does not really affect HCR_EL2.FWB;
+         * we only need to filter FWB for aa32 or other FEAT.
+         */
+        device = S2_attrs_are_device(arm_hcr_el2_eff(env),
+                                     result->cacheattrs.attrs);
     } else {
         int nse, ns = extract32(attrs, 5, 1);
+        uint8_t attrindx;
+        uint64_t mair;
+
         switch (out_space) {
         case ARMSS_Root:
             /*
@@ -2102,6 +2114,19 @@  static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
          */
         result->f.prot = get_S1prot(env, mmu_idx, aarch64, ap, xn, pxn,
                                     result->f.attrs.space, out_space);
+
+        /* Index into MAIR registers for cache attributes */
+        attrindx = extract32(attrs, 2, 3);
+        mair = env->cp15.mair_el[regime_el(env, mmu_idx)];
+        assert(attrindx <= 7);
+        result->cacheattrs.is_s2_format = false;
+        result->cacheattrs.attrs = extract64(mair, attrindx * 8, 8);
+
+        /* When in aarch64 mode, and BTI is enabled, remember GP in the TLB. */
+        if (aarch64 && cpu_isar_feature(aa64_bti, cpu)) {
+            result->f.extra.arm.guarded = extract64(attrs, 50, 1); /* GP */
+        }
+        device = S1_attrs_are_device(result->cacheattrs.attrs);
     }
 
     if (!(result->f.prot & (1 << access_type))) {
@@ -2131,30 +2156,6 @@  static bool get_phys_addr_lpae(CPUARMState *env, S1Translate *ptw,
     result->f.attrs.space = out_space;
     result->f.attrs.secure = arm_space_is_secure(out_space);
 
-    if (regime_is_stage2(mmu_idx)) {
-        result->cacheattrs.is_s2_format = true;
-        result->cacheattrs.attrs = extract32(attrs, 2, 4);
-        /*
-         * Security state does not really affect HCR_EL2.FWB;
-         * we only need to filter FWB for aa32 or other FEAT.
-         */
-        device = S2_attrs_are_device(arm_hcr_el2_eff(env),
-                                     result->cacheattrs.attrs);
-    } else {
-        /* Index into MAIR registers for cache attributes */
-        uint8_t attrindx = extract32(attrs, 2, 3);
-        uint64_t mair = env->cp15.mair_el[regime_el(env, mmu_idx)];
-        assert(attrindx <= 7);
-        result->cacheattrs.is_s2_format = false;
-        result->cacheattrs.attrs = extract64(mair, attrindx * 8, 8);
-
-        /* When in aarch64 mode, and BTI is enabled, remember GP in the TLB. */
-        if (aarch64 && cpu_isar_feature(aa64_bti, cpu)) {
-            result->f.extra.arm.guarded = extract64(attrs, 50, 1); /* GP */
-        }
-        device = S1_attrs_are_device(result->cacheattrs.attrs);
-    }
-
     /*
      * Enable alignment checks on Device memory.
      *