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Tsirkin" , mark.burton@greensocs.com, qemu-devel@nongnu.org, pbonzini@redhat.com, =?UTF-8?q?Alex=20Benn=C3=A9e?= , Richard Henderson Subject: [Qemu-devel] [RFC v1 04/11] tcg: protect TBContext with tb_lock. X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: KONRAD Frederic This protects TBContext with tb_lock to make tb_* thread safe. We can still have issue with tb_flush in case of multithread TCG: another CPU can be executing code during a flush. This can be fixed later by making all other TCG thread exiting before calling tb_flush(). Signed-off-by: KONRAD Frederic Message-Id: <1439220437-23957-8-git-send-email-fred.konrad@greensocs.com> Signed-off-by: Emilio G. Cota Signed-off-by: Paolo Bonzini [AJB: moved into tree, clean-up history] Signed-off-by: Alex Bennée --- v7 (FK): - Drop a tb_lock in already locked restore_state_to_opc. v6 (FK): - Drop a tb_lock arround tb_find_fast in cpu-exec.c. --- cpu-exec.c | 6 ++++++ exec.c | 3 +++ hw/i386/kvmvapic.c | 3 +++ translate-all.c | 32 +++++++++++++++++++++++++------- 4 files changed, 37 insertions(+), 7 deletions(-) diff --git a/cpu-exec.c b/cpu-exec.c index e71113e..3572256 100644 --- a/cpu-exec.c +++ b/cpu-exec.c @@ -196,18 +196,24 @@ static void cpu_exec_nocache(CPUState *cpu, int max_cycles, if (max_cycles > CF_COUNT_MASK) max_cycles = CF_COUNT_MASK; + tb_lock(); cpu->tb_invalidated_flag = 0; tb = tb_gen_code(cpu, orig_tb->pc, orig_tb->cs_base, orig_tb->flags, max_cycles | CF_NOCACHE | (ignore_icount ? CF_IGNORE_ICOUNT : 0)); tb->orig_tb = cpu->tb_invalidated_flag ? NULL : orig_tb; cpu->current_tb = tb; + tb_unlock(); + /* execute the generated code */ trace_exec_tb_nocache(tb, tb->pc); cpu_tb_exec(cpu, tb->tc_ptr); + + tb_lock(); cpu->current_tb = NULL; tb_phys_invalidate(tb, -1); tb_free(tb); + tb_unlock(); } #endif diff --git a/exec.c b/exec.c index 4f0e5ed..402b751 100644 --- a/exec.c +++ b/exec.c @@ -2112,6 +2112,9 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags) continue; } cpu->watchpoint_hit = wp; + + /* Unlocked by cpu_loop_exit or cpu_resume_from_signal. */ + tb_lock(); tb_check_watchpoint(cpu); if (wp->flags & BP_STOP_BEFORE_ACCESS) { cpu->exception_index = EXCP_DEBUG; diff --git a/hw/i386/kvmvapic.c b/hw/i386/kvmvapic.c index c69f374..7c0d542 100644 --- a/hw/i386/kvmvapic.c +++ b/hw/i386/kvmvapic.c @@ -14,6 +14,7 @@ #include "sysemu/kvm.h" #include "hw/i386/apic_internal.h" #include "hw/sysbus.h" +#include "tcg/tcg.h" #define VAPIC_IO_PORT 0x7e @@ -446,6 +447,8 @@ static void patch_instruction(VAPICROMState *s, X86CPU *cpu, target_ulong ip) resume_all_vcpus(); if (!kvm_enabled()) { + /* Unlocked by cpu_resume_from_signal. */ + tb_lock(); cs->current_tb = NULL; tb_gen_code(cs, current_pc, current_cs_base, current_flags, 1); cpu_resume_from_signal(cs, NULL); diff --git a/translate-all.c b/translate-all.c index 1a02450..1aab243 100644 --- a/translate-all.c +++ b/translate-all.c @@ -847,7 +847,9 @@ static void page_flush_tb(void) } /* flush all the translation blocks */ -/* XXX: tb_flush is currently not thread safe */ +/* XXX: tb_flush is currently not thread safe. System emulation calls it only + * with tb_lock taken or from safe_work, so no need to take tb_lock here. + */ void tb_flush(CPUState *cpu) { #if defined(DEBUG_FLUSH) @@ -1253,6 +1255,7 @@ void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end, /* we remove all the TBs in the range [start, end[ */ /* XXX: see if in some cases it could be faster to invalidate all the code */ + tb_lock(); tb = p->first_tb; while (tb != NULL) { n = (uintptr_t)tb & 3; @@ -1320,12 +1323,13 @@ void tb_invalidate_phys_page_range(tb_page_addr_t start, tb_page_addr_t end, if (current_tb_modified) { /* we generate a block containing just the instruction modifying the memory. It will ensure that it cannot modify - itself */ + itself. cpu_resume_from_signal unlocks tb_lock. */ cpu->current_tb = NULL; tb_gen_code(cpu, current_pc, current_cs_base, current_flags, 1); cpu_resume_from_signal(cpu, NULL); } #endif + tb_unlock(); } #ifdef CONFIG_SOFTMMU @@ -1392,6 +1396,8 @@ static void tb_invalidate_phys_page(tb_page_addr_t addr, if (!p) { return; } + + tb_lock(); tb = p->first_tb; #ifdef TARGET_HAS_PRECISE_SMC if (tb && pc != 0) { @@ -1433,9 +1439,12 @@ static void tb_invalidate_phys_page(tb_page_addr_t addr, if (locked) { mmap_unlock(); } + + /* tb_lock released by cpu_resume_from_signal. */ cpu_resume_from_signal(cpu, puc); } #endif + tb_unlock(); } #endif @@ -1639,6 +1648,7 @@ void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr) target_ulong pc, cs_base; uint64_t flags; + tb_lock(); tb = tb_find_pc(retaddr); if (!tb) { cpu_abort(cpu, "cpu_io_recompile: could not find TB for pc=%p", @@ -1690,11 +1700,15 @@ void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr) /* FIXME: In theory this could raise an exception. In practice we have already translated the block once so it's probably ok. */ tb_gen_code(cpu, pc, cs_base, flags, cflags); - /* TODO: If env->pc != tb->pc (i.e. the faulting instruction was not - the first in the TB) then we end up generating a whole new TB and - repeating the fault, which is horribly inefficient. - Better would be to execute just this insn uncached, or generate a - second new TB. */ + + /* This unlocks the tb_lock. + * + * TODO: If env->pc != tb->pc (i.e. the faulting instruction was not + * the first in the TB) then we end up generating a whole new TB and + * repeating the fault, which is horribly inefficient. + * Better would be to execute just this insn uncached, or generate a + * second new TB. + */ cpu_resume_from_signal(cpu, NULL); } @@ -1719,6 +1733,8 @@ void dump_exec_info(FILE *f, fprintf_function cpu_fprintf) int direct_jmp_count, direct_jmp2_count, cross_page; TranslationBlock *tb; + tb_lock(); + target_code_size = 0; max_target_code_size = 0; cross_page = 0; @@ -1774,6 +1790,8 @@ void dump_exec_info(FILE *f, fprintf_function cpu_fprintf) tcg_ctx.tb_ctx.tb_phys_invalidate_count); cpu_fprintf(f, "TLB flush count %d\n", tlb_flush_count); tcg_dump_info(f, cpu_fprintf); + + tb_unlock(); } void dump_opcount_info(FILE *f, fprintf_function cpu_fprintf)