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Re: [RFC v1 1/2] accel/tcg: split CpusAccel into three TCG variants
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From: |
Philippe Mathieu-Daudé |
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Subject: |
Re: [RFC v1 1/2] accel/tcg: split CpusAccel into three TCG variants |
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Date: |
Wed, 14 Oct 2020 09:58:45 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.3.1 |
On 10/14/20 9:36 AM, Claudio Fontana wrote:
split up the CpusAccel tcg_cpus into three TCG variants:
tcg_cpus_rr (single threaded, round robin cpus)
tcg_cpus_icount (same as rr, but with instruction counting enabled)
tcg_cpus_mttcg (multi-threaded cpus)
Signed-off-by: Claudio Fontana <cfontana@suse.de>
---
accel/tcg/meson.build | 9 +-
accel/tcg/tcg-all.c | 8 +-
accel/tcg/tcg-cpus-icount.c | 145 +++++++++++
accel/tcg/tcg-cpus-icount.h | 20 ++
accel/tcg/tcg-cpus-mttcg.c | 118 +++++++++
accel/tcg/tcg-cpus-mttcg.h | 25 ++
accel/tcg/tcg-cpus-rr.c | 270 ++++++++++++++++++++
accel/tcg/tcg-cpus-rr.h | 23 ++
accel/tcg/tcg-cpus.c | 478 ++----------------------------------
accel/tcg/tcg-cpus.h | 9 +-
softmmu/icount.c | 2 +-
11 files changed, 647 insertions(+), 460 deletions(-)
create mode 100644 accel/tcg/tcg-cpus-icount.c
create mode 100644 accel/tcg/tcg-cpus-icount.h
create mode 100644 accel/tcg/tcg-cpus-mttcg.c
create mode 100644 accel/tcg/tcg-cpus-mttcg.h
create mode 100644 accel/tcg/tcg-cpus-rr.c
create mode 100644 accel/tcg/tcg-cpus-rr.h
...
diff --git a/accel/tcg/tcg-cpus-icount.c b/accel/tcg/tcg-cpus-icount.c
new file mode 100644
index 0000000000..43505e8f1f
--- /dev/null
+++ b/accel/tcg/tcg-cpus-icount.c
@@ -0,0 +1,145 @@
+/*
+ * QEMU System Emulator
"QEMU single threaded vCPUs implementation using instruction counting"?
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ * Copyright (c) 2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
...
diff --git a/accel/tcg/tcg-cpus-icount.h b/accel/tcg/tcg-cpus-icount.h
new file mode 100644
index 0000000000..e2e25674c2
--- /dev/null
+++ b/accel/tcg/tcg-cpus-icount.h
@@ -0,0 +1,20 @@
+/*
+ * Accelerator CPUS Interface
Ditto.
+ *
+ * Copyright 2020 SUSE LLC
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef TCG_CPUS_ICOUNT_H
+#define TCG_CPUS_ICOUNT_H
+
+extern const CpusAccel tcg_cpus_icount;
+
+int64_t tcg_get_icount_limit(void);
+void handle_icount_deadline(void);
+void prepare_icount_for_run(CPUState *cpu);
+void process_icount_data(CPUState *cpu);
+
+#endif /* TCG_CPUS_ICOUNT_H */
diff --git a/accel/tcg/tcg-cpus-mttcg.c b/accel/tcg/tcg-cpus-mttcg.c
new file mode 100644
index 0000000000..2f5317d767
--- /dev/null
+++ b/accel/tcg/tcg-cpus-mttcg.c
@@ -0,0 +1,118 @@
+/*
+ * QEMU System Emulator
"QEMU multi-threaded vCPUs implementation"?
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ * Copyright (c) 2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
...
diff --git a/accel/tcg/tcg-cpus-mttcg.h b/accel/tcg/tcg-cpus-mttcg.h
new file mode 100644
index 0000000000..c8966b2f8a
--- /dev/null
+++ b/accel/tcg/tcg-cpus-mttcg.h
@@ -0,0 +1,25 @@
+/*
+ * Accelerator CPUS Interface
Ditto.
+ *
+ * Copyright 2020 SUSE LLC
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef TCG_CPUS_MTTCG_H
+#define TCG_CPUS_MTTCG_H
+
+extern const CpusAccel tcg_cpus_mttcg;
+
+/*
+ * Multi-threaded TCG
+ *
+ * In the multi-threaded case each vCPU has its own thread. The TLS
+ * variable current_cpu can be used deep in the code to find the
+ * current CPUState for a given thread.
+ */
+
+void *tcg_cpu_thread_fn(void *arg);
+
+#endif /* TCG_CPUS_MTTCG_H */
diff --git a/accel/tcg/tcg-cpus-rr.c b/accel/tcg/tcg-cpus-rr.c
new file mode 100644
index 0000000000..b8fd33d9d3
--- /dev/null
+++ b/accel/tcg/tcg-cpus-rr.c
@@ -0,0 +1,270 @@
+/*
+ * QEMU System Emulator
"QEMU single threaded (using round robin) vCPUs implementation"?
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ * Copyright (c) 2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
...
diff --git a/accel/tcg/tcg-cpus-rr.h b/accel/tcg/tcg-cpus-rr.h
new file mode 100644
index 0000000000..155510cfd4
--- /dev/null
+++ b/accel/tcg/tcg-cpus-rr.h
@@ -0,0 +1,23 @@
+/*
+ * Accelerator CPUS Interface
Ditto.
+ *
+ * Copyright 2020 SUSE LLC
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef TCG_CPUS_RR_H
+#define TCG_CPUS_RR_H
+
+extern const CpusAccel tcg_cpus_rr;
+
+#define TCG_KICK_PERIOD (NANOSECONDS_PER_SECOND / 10)
+
+/* Kick all RR vCPUs. */
+void qemu_cpu_kick_rr_cpus(CPUState *unused);
+
+/* Single-threaded TCG */
+void *tcg_rr_cpu_thread_fn(void *arg);
+
+#endif /* TCG_CPUS_RR_H */
...
diff --git a/accel/tcg/tcg-cpus.h b/accel/tcg/tcg-cpus.h
index 8b1d9d2abc..871e58507d 100644
--- a/accel/tcg/tcg-cpus.h
+++ b/accel/tcg/tcg-cpus.h
@@ -12,6 +12,13 @@
#include "sysemu/cpus.h"
-extern const CpusAccel tcg_cpus;
+#include "tcg-cpus-rr.h"
+#include "tcg-cpus-icount.h"
+#include "tcg-cpus-mttcg.h"
Why do we need to include the implementation declarations?
+
+void tcg_start_vcpu_thread(CPUState *cpu);
+void qemu_tcg_destroy_vcpu(CPUState *cpu);
+int tcg_cpu_exec(CPUState *cpu);
+void tcg_handle_interrupt(CPUState *cpu, int mask);
#endif /* TCG_CPUS_H */
diff --git a/softmmu/icount.c b/softmmu/icount.c
index 020a201a01..dbcd8c3594 100644
--- a/softmmu/icount.c
+++ b/softmmu/icount.c
@@ -396,7 +396,7 @@ void icount_start_warp_timer(void)
void icount_account_warp_timer(void)
{
- if (!icount_enabled() || !icount_sleep) {
+ if (!icount_sleep) {
return;
}