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Re: [Qemu-devel] [PATCH] linux-user: Fix stale tbs after mmap
From: |
Alexander Graf |
Subject: |
Re: [Qemu-devel] [PATCH] linux-user: Fix stale tbs after mmap |
Date: |
Mon, 7 May 2012 13:07:34 +0200 |
On 07.05.2012, at 12:37, Peter Maydell wrote:
> On 7 May 2012 10:30, Alexander Graf <address@hidden> wrote:
>> @@ -587,6 +587,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int
>> prot,
>> page_dump(stdout);
>> printf("\n");
>> #endif
>> + tb_invalidate_phys_page_range(start, start + len, 0);
>> mmap_unlock();
>> return start;
>
> The comment at the top of tb_invalidate_phys_page_range() says
> "start and end must refer to the same physical page" -- is it
> out of date or does that not apply to user-mode?
How about this one?
diff --git a/exec-all.h b/exec-all.h
index c211242..7fcd76f 100644
--- a/exec-all.h
+++ b/exec-all.h
@@ -96,6 +96,8 @@ void QEMU_NORETURN cpu_loop_exit(CPUState *env1);
int page_unprotect(target_ulong address, unsigned long pc, void *puc);
void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end,
int is_cpu_write_access);
+void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end,
+ int is_cpu_write_access);
void tlb_flush_page(CPUState *env, target_ulong addr);
void tlb_flush(CPUState *env, int flush_global);
#if !defined(CONFIG_USER_ONLY)
diff --git a/exec.c b/exec.c
index e71a82d..532b00c 100644
--- a/exec.c
+++ b/exec.c
@@ -1016,6 +1016,23 @@ TranslationBlock *tb_gen_code(CPUState *env,
return tb;
}
+/*
+ * invalidate all TBs which intersect with the target physical pages
+ * starting in range [start;end[. NOTE: start and end may refer to
+ * different physical pages. 'is_cpu_write_access' should be true if called
+ * from a real cpu write access: the virtual CPU will exit the current
+ * TB if code is modified inside this TB.
+ */
+void tb_invalidate_phys_range(tb_page_addr_t start, tb_page_addr_t end,
+ int is_cpu_write_access)
+{
+ while (start < end) {
+ tb_invalidate_phys_page_range(start, end, is_cpu_write_access);
+ start &= TARGET_PAGE_MASK;
+ start += TARGET_PAGE_SIZE;
+ }
+}
+
/* invalidate all TBs which intersect with the target physical page
starting in range [start;end[. NOTE: start and end must refer to
the same physical page. 'is_cpu_write_access' should be true if called
diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 2620f88..3611deb 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -587,6 +587,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int
prot,
page_dump(stdout);
printf("\n");
#endif
+ tb_invalidate_phys_range(start, start + len, 0);
mmap_unlock();
return start;
fail:
@@ -768,6 +769,7 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong
old_size,
page_set_flags(old_addr, old_addr + old_size, 0);
page_set_flags(new_addr, new_addr + new_size, prot | PAGE_VALID);
}
+ tb_invalidate_phys_range(new_addr, new_addr + new_size, 0);
mmap_unlock();
return new_addr;
}