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From: David Hildenbrand <david@redhat.com>
To: qemu-devel@nongnu.org
Cc: Thomas Huth <thuth@redhat.com>, Riku Voipio <riku.voipio@iki.fi>,
	Eduardo Habkost <ehabkost@redhat.com>,
	David Hildenbrand <david@redhat.com>,
	Aleksandar Rikalo <arikalo@wavecomp.com>,
	Cornelia Huck <cohuck@redhat.com>,
	Richard Henderson <richard.henderson@linaro.org>,
	Aleksandar Markovic <amarkovic@wavecomp.com>,
	qemu-s390x@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>,
	Aurelien Jarno <aurelien@aurel32.net>,
	Richard Henderson <rth@twiddle.net>
Subject: [Qemu-devel] [PATCH v1 9/9] tcg: Check for watchpoints in probe_write()
Date: Fri, 23 Aug 2019 12:07:41 +0200
Message-ID: <20190823100741.9621-10-david@redhat.com> (raw)
In-Reply-To: <20190823100741.9621-1-david@redhat.com>

Let's check for write watchpoints. We'll want to do something similar
for probe_read() in the future (once we introduce that).

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 accel/tcg/cputlb.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c
index 4b49ccb58a..8382ac2fc2 100644
--- a/accel/tcg/cputlb.c
+++ b/accel/tcg/cputlb.c
@@ -1063,6 +1063,7 @@ void probe_write(CPUArchState *env, target_ulong addr, int size, int mmu_idx,
 {
     uintptr_t index = tlb_index(env, mmu_idx, addr);
     CPUTLBEntry *entry = tlb_entry(env, mmu_idx, addr);
+    target_ulong tlb_addr;
 
     g_assert(-(addr | TARGET_PAGE_MASK) >= size);
 
@@ -1071,8 +1072,23 @@ void probe_write(CPUArchState *env, target_ulong addr, int size, int mmu_idx,
         if (!VICTIM_TLB_HIT(addr_write, addr)) {
             tlb_fill(env_cpu(env), addr, size, MMU_DATA_STORE,
                      mmu_idx, retaddr);
+            /* TLB resize via tlb_fill may have moved the entry. */
+            entry = tlb_entry(env, mmu_idx, addr);
         }
     }
+
+    if (!size) {
+        return;
+    }
+    tlb_addr = tlb_addr_write(entry);
+
+    /* Watchpoints for this entry only apply if TLB_MMIO was set. */
+    if (tlb_addr & TLB_MMIO) {
+        MemTxAttrs attrs = env_tlb(env)->d[mmu_idx].iotlb[index].attrs;
+
+        cpu_check_watchpoint(env_cpu(env), addr, size, attrs, BP_MEM_WRITE,
+                             retaddr);
+    }
 }
 
 void *tlb_vaddr_to_host(CPUArchState *env, abi_ptr addr,
-- 
2.21.0



  parent reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-23 10:07 [Qemu-devel] [PATCH v1 0/9] tcg: probe_write() refactorings and watchpoints David Hildenbrand
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 1/9] s390x/tcg: Use guest_addr_valid() instead of h2g_valid() in probe_write_access() David Hildenbrand
2019-08-23 14:49   ` Richard Henderson
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 2/9] s390x/tcg: Fix length calculation " David Hildenbrand
2019-08-23 14:50   ` Richard Henderson
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 3/9] tcg: Factor out CONFIG_USER_ONLY probe_write() from s390x code David Hildenbrand
2019-08-23 15:17   ` Richard Henderson
2019-08-23 15:22   ` Richard Henderson
2019-08-23 15:49     ` David Hildenbrand
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 4/9] tcg: Enforce single page access in probe_write() for !CONFIG_USER_ONLY David Hildenbrand
2019-08-23 15:28   ` Richard Henderson
2019-08-23 15:29     ` Richard Henderson
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 5/9] mips/tcg: Call probe_write() for CONFIG_USER_ONLY as well David Hildenbrand
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 6/9] hppa/tcg: Call probe_write() also for CONFIG_USER_ONLY David Hildenbrand
2019-08-23 15:31   ` Richard Henderson
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 7/9] s390x/tcg: Pass a size to probe_write() in do_csst() David Hildenbrand
2019-08-23 15:32   ` Richard Henderson
2019-08-23 10:07 ` [Qemu-devel] [PATCH v1 8/9] exec.c: Factor out core logic of check_watchpoint() David Hildenbrand
2019-08-23 11:27   ` David Hildenbrand
2019-08-23 16:09     ` Richard Henderson
2019-08-23 18:25       ` David Hildenbrand
2019-08-24 15:27     ` Richard Henderson
2019-08-23 10:07 ` David Hildenbrand [this message]
2019-08-23 16:15   ` [Qemu-devel] [PATCH v1 9/9] tcg: Check for watchpoints in probe_write() Richard Henderson
2019-08-24 19:45   ` Richard Henderson

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