From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57897) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fKuOv-0002f7-I1 for qemu-devel@nongnu.org; Mon, 21 May 2018 19:39:39 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fKuOr-0005Z2-BT for qemu-devel@nongnu.org; Mon, 21 May 2018 19:39:37 -0400 Received: from out1-smtp.messagingengine.com ([66.111.4.25]:45731) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fKuOq-0005Xa-Fd for qemu-devel@nongnu.org; Mon, 21 May 2018 19:39:32 -0400 From: "Emilio G. Cota" Date: Mon, 21 May 2018 19:39:21 -0400 Message-Id: <1526945967-9687-12-git-send-email-cota@braap.org> In-Reply-To: <1526945967-9687-1-git-send-email-cota@braap.org> References: <1526945967-9687-1-git-send-email-cota@braap.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: [Qemu-devel] [PATCH v3 11/17] translate-all: add page_locked assertions List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Richard Henderson , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Paolo Bonzini This is only compiled under CONFIG_DEBUG_TCG to avoid bloating the binary. In user-mode, assert_page_locked is equivalent to assert_mmap_lock. Note: There are some tb_lock assertions left that will be removed by later patches. Suggested-by: Alex Bennée Signed-off-by: Emilio G. Cota --- accel/tcg/translate-all.c | 81 +++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 78 insertions(+), 3 deletions(-) diff --git a/accel/tcg/translate-all.c b/accel/tcg/translate-all.c index 14c2c23..8286203 100644 --- a/accel/tcg/translate-all.c +++ b/accel/tcg/translate-all.c @@ -583,6 +583,9 @@ static void page_lock_pair(PageDesc **ret_p1, tb_page_addr_t phys1, /* In user-mode page locks aren't used; mmap_lock is enough */ #ifdef CONFIG_USER_ONLY + +#define assert_page_locked(pd) tcg_debug_assert(have_mmap_lock()) + static inline void page_lock(PageDesc *pd) { } @@ -605,14 +608,80 @@ void page_collection_unlock(struct page_collection *set) { } #else /* !CONFIG_USER_ONLY */ +#ifdef CONFIG_DEBUG_TCG + +static __thread GHashTable *ht_pages_locked_debug; + +static void ht_pages_locked_debug_init(void) +{ + if (ht_pages_locked_debug) { + return; + } + ht_pages_locked_debug = g_hash_table_new(NULL, NULL); +} + +static bool page_is_locked(const PageDesc *pd) +{ + PageDesc *found; + + ht_pages_locked_debug_init(); + found = g_hash_table_lookup(ht_pages_locked_debug, pd); + return !!found; +} + +static void page_lock__debug(PageDesc *pd) +{ + ht_pages_locked_debug_init(); + g_assert(!page_is_locked(pd)); + g_hash_table_insert(ht_pages_locked_debug, pd, pd); +} + +static void page_unlock__debug(const PageDesc *pd) +{ + bool removed; + + ht_pages_locked_debug_init(); + g_assert(page_is_locked(pd)); + removed = g_hash_table_remove(ht_pages_locked_debug, pd); + g_assert(removed); +} + +static void +do_assert_page_locked(const PageDesc *pd, const char *file, int line) +{ + if (unlikely(!page_is_locked(pd))) { + error_report("assert_page_lock: PageDesc %p not locked @ %s:%d", + pd, file, line); + abort(); + } +} + +#define assert_page_locked(pd) do_assert_page_locked(pd, __FILE__, __LINE__) + +#else /* !CONFIG_DEBUG_TCG */ + +#define assert_page_locked(pd) + +static inline void page_lock__debug(const PageDesc *pd) +{ +} + +static inline void page_unlock__debug(const PageDesc *pd) +{ +} + +#endif /* CONFIG_DEBUG_TCG */ + static inline void page_lock(PageDesc *pd) { + page_lock__debug(pd); qemu_spin_lock(&pd->lock); } static inline void page_unlock(PageDesc *pd) { qemu_spin_unlock(&pd->lock); + page_unlock__debug(pd); } /* lock the page(s) of a TB in the correct acquisition order */ @@ -775,6 +844,7 @@ page_collection_lock(tb_page_addr_t start, tb_page_addr_t end) g_tree_foreach(set->tree, page_entry_unlock, NULL); goto retry; } + assert_page_locked(pd); PAGE_FOR_EACH_TB(pd, tb, n) { if (page_trylock_add(set, tb->page_addr[0]) || (tb->page_addr[1] != -1 && @@ -1113,6 +1183,7 @@ static TranslationBlock *tb_alloc(target_ulong pc) /* call with @p->lock held */ static inline void invalidate_page_bitmap(PageDesc *p) { + assert_page_locked(p); #ifdef CONFIG_SOFTMMU g_free(p->code_bitmap); p->code_bitmap = NULL; @@ -1269,6 +1340,7 @@ static inline void tb_page_remove(PageDesc *pd, TranslationBlock *tb) uintptr_t *pprev; unsigned int n1; + assert_page_locked(pd); pprev = &pd->first_tb; PAGE_FOR_EACH_TB(pd, tb1, n1) { if (tb1 == tb) { @@ -1417,6 +1489,7 @@ static void build_page_bitmap(PageDesc *p) int n, tb_start, tb_end; TranslationBlock *tb; + assert_page_locked(p); p->code_bitmap = bitmap_new(TARGET_PAGE_SIZE); PAGE_FOR_EACH_TB(p, tb, n) { @@ -1450,7 +1523,7 @@ static inline void tb_page_add(PageDesc *p, TranslationBlock *tb, bool page_already_protected; #endif - assert_memory_lock(); + assert_page_locked(p); tb->page_addr[n] = page_addr; tb->page_next[n] = p->first_tb; @@ -1721,8 +1794,7 @@ tb_invalidate_phys_page_range__locked(struct page_collection *pages, uint32_t current_flags = 0; #endif /* TARGET_HAS_PRECISE_SMC */ - assert_memory_lock(); - assert_tb_locked(); + assert_page_locked(p); #if defined(TARGET_HAS_PRECISE_SMC) if (cpu != NULL) { @@ -1734,6 +1806,7 @@ tb_invalidate_phys_page_range__locked(struct page_collection *pages, /* XXX: see if in some cases it could be faster to invalidate all the code */ PAGE_FOR_EACH_TB(p, tb, n) { + assert_page_locked(p); /* NOTE: this is subtle as a TB may span two physical pages */ if (n == 0) { /* NOTE: tb_end may be after the end of the page, but @@ -1891,6 +1964,7 @@ void tb_invalidate_phys_page_fast(tb_page_addr_t start, int len) } pages = page_collection_lock(start, start + len); + assert_page_locked(p); if (!p->code_bitmap && ++p->code_write_count >= SMC_BITMAP_USE_THRESHOLD) { build_page_bitmap(p); @@ -1949,6 +2023,7 @@ static bool tb_invalidate_phys_page(tb_page_addr_t addr, uintptr_t pc) env = cpu->env_ptr; } #endif + assert_page_locked(p); PAGE_FOR_EACH_TB(p, tb, n) { #ifdef TARGET_HAS_PRECISE_SMC if (current_tb == tb && -- 2.7.4