[PATCH v3 42/42] target/arm: Use the max page size in a 2-stage ptw

[Richard Henderson]

We had only been reporting the stage2 page size.  This causes
problems if stage1 is using a larger page size (16k, 2M, etc),
but stage2 is using a smaller page size, because cputlb does
not set large_page_{addr,mask} properly.

Fix by using the max of the two page sizes.

Reported-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/arm/ptw.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/target/arm/ptw.c b/target/arm/ptw.c
index 14ab56d1b5..985a5703c3 100644
--- a/target/arm/ptw.c
+++ b/target/arm/ptw.c
@@ -2550,7 +2550,7 @@ static bool get_phys_addr_twostage(CPUARMState *env, 
target_ulong address,
                                    ARMMMUFaultInfo *fi)
 {
     hwaddr ipa;
-    int s1_prot;
+    int s1_prot, s1_lgpgsz;
     bool ret, ipa_secure, s2walk_secure;
     ARMCacheAttrs cacheattrs1;
     ARMMMUIdx s2_mmu_idx, s2_ptw_idx;
@@ -2592,6 +2592,7 @@ static bool get_phys_addr_twostage(CPUARMState *env, 
target_ulong address,
      * Save the stage1 results so that we may merge prot and cacheattrs later.
      */
     s1_prot = result->f.prot;
+    s1_lgpgsz = result->f.lg_page_size;
     cacheattrs1 = result->cacheattrs;
     memset(result, 0, sizeof(*result));
 
@@ -2607,6 +2608,14 @@ static bool get_phys_addr_twostage(CPUARMState *env, 
target_ulong address,
         return ret;
     }
 
+    /*
+     * Use the maximum of the S1 & S2 page size, so that invalidation
+     * of pages > TARGET_PAGE_SIZE works correctly.
+     */
+    if (result->f.lg_page_size < s1_lgpgsz) {
+        result->f.lg_page_size = s1_lgpgsz;
+    }
+
     /* Combine the S1 and S2 cache attributes. */
     hcr = arm_hcr_el2_eff_secstate(env, is_secure);
     if (hcr & HCR_DC) {
-- 
2.34.1