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Re: [PATCH v3 12/12] target/riscv: Simplify probing in vext_ldff


From: Max Chou
Subject: Re: [PATCH v3 12/12] target/riscv: Simplify probing in vext_ldff
Date: Tue, 23 Jul 2024 00:49:14 +0800
User-agent: Mozilla Thunderbird

Reviewed-by: Max Chou <max.chou@sifive.com>

On 2024/7/19 9:07 AM, Richard Henderson wrote:
The current pairing of tlb_vaddr_to_host with extra is either
inefficient (user-only, with page_check_range) or incorrect
(system, with probe_pages).

For proper non-fault behaviour, use probe_access_flags with
its nonfault parameter set to true.

Acked-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
  target/riscv/vector_helper.c | 31 +++++++++++++++++--------------
  1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/target/riscv/vector_helper.c b/target/riscv/vector_helper.c
index 1b4d5a8e37..10a52ceb5b 100644
--- a/target/riscv/vector_helper.c
+++ b/target/riscv/vector_helper.c
@@ -474,7 +474,6 @@ vext_ldff(void *vd, void *v0, target_ulong base,
            vext_ldst_elem_fn *ldst_elem,
            uint32_t log2_esz, uintptr_t ra)
  {
-    void *host;
      uint32_t i, k, vl = 0;
      uint32_t nf = vext_nf(desc);
      uint32_t vm = vext_vm(desc);
@@ -493,27 +492,31 @@ vext_ldff(void *vd, void *v0, target_ulong base,
          }
          addr = adjust_addr(env, base + i * (nf << log2_esz));
          if (i == 0) {
+            /* Allow fault on first element. */
              probe_pages(env, addr, nf << log2_esz, ra, MMU_DATA_LOAD);
          } else {
-            /* if it triggers an exception, no need to check watchpoint */
              remain = nf << log2_esz;
              while (remain > 0) {
+                void *host;
+                int flags;
+
                  offset = -(addr | TARGET_PAGE_MASK);
-                host = tlb_vaddr_to_host(env, addr, MMU_DATA_LOAD, mmu_index);
-                if (host) {
-#ifdef CONFIG_USER_ONLY
-                    if (!page_check_range(addr, offset, PAGE_READ)) {
-                        vl = i;
-                        goto ProbeSuccess;
-                    }
-#else
-                    probe_pages(env, addr, offset, ra, MMU_DATA_LOAD);
-#endif
-                } else {
+
+                /* Probe nonfault on subsequent elements. */
+                flags = probe_access_flags(env, addr, offset, MMU_DATA_LOAD,
+                                           mmu_index, true, &host, 0);
+
+                /*
+                 * Stop if invalid (unmapped) or mmio (transaction may fail).
+                 * Do not stop if watchpoint, as the spec says that
+                 * first-fault should continue to access the same
+                 * elements regardless of any watchpoint.
+                 */
+                if (flags & ~TLB_WATCHPOINT) {
                      vl = i;
                      goto ProbeSuccess;
                  }
-                if (remain <=  offset) {
+                if (remain <= offset) {
                      break;
                  }
                  remain -= offset;




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