8d04fb55de
This finally allows TCG to benefit from the iothread introduction: Drop the global mutex while running pure TCG CPU code. Reacquire the lock when entering MMIO or PIO emulation, or when leaving the TCG loop. We have to revert a few optimization for the current TCG threading model, namely kicking the TCG thread in qemu_mutex_lock_iothread and not kicking it in qemu_cpu_kick. We also need to disable RAM block reordering until we have a more efficient locking mechanism at hand. Still, a Linux x86 UP guest and my Musicpal ARM model boot fine here. These numbers demonstrate where we gain something: 20338 jan 20 0 331m 75m 6904 R 99 0.9 0:50.95 qemu-system-arm 20337 jan 20 0 331m 75m 6904 S 20 0.9 0:26.50 qemu-system-arm The guest CPU was fully loaded, but the iothread could still run mostly independent on a second core. Without the patch we don't get beyond 32206 jan 20 0 330m 73m 7036 R 82 0.9 1:06.00 qemu-system-arm 32204 jan 20 0 330m 73m 7036 S 21 0.9 0:17.03 qemu-system-arm We don't benefit significantly, though, when the guest is not fully loading a host CPU. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Message-Id: <1439220437-23957-10-git-send-email-fred.konrad@greensocs.com> [FK: Rebase, fix qemu_devices_reset deadlock, rm address_space_* mutex] Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com> [EGC: fixed iothread lock for cpu-exec IRQ handling] Signed-off-by: Emilio G. Cota <cota@braap.org> [AJB: -smp single-threaded fix, clean commit msg, BQL fixes] Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net> Reviewed-by: Pranith Kumar <bobby.prani@gmail.com> [PM: target-arm changes] Acked-by: Peter Maydell <peter.maydell@linaro.org>
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/*
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* Host code generation common components
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*
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* Copyright (c) 2015 Peter Crosthwaite <crosthwaite.peter@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "qom/cpu.h"
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#include "sysemu/cpus.h"
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#include "qemu/main-loop.h"
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uintptr_t qemu_real_host_page_size;
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intptr_t qemu_real_host_page_mask;
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#ifndef CONFIG_USER_ONLY
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/* mask must never be zero, except for A20 change call */
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static void tcg_handle_interrupt(CPUState *cpu, int mask)
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{
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int old_mask;
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g_assert(qemu_mutex_iothread_locked());
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old_mask = cpu->interrupt_request;
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cpu->interrupt_request |= mask;
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/*
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* If called from iothread context, wake the target cpu in
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* case its halted.
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*/
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if (!qemu_cpu_is_self(cpu)) {
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qemu_cpu_kick(cpu);
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} else {
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if (use_icount) {
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cpu->icount_decr.u16.high = 0xffff;
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if (!cpu->can_do_io
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&& (mask & ~old_mask) != 0) {
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cpu_abort(cpu, "Raised interrupt while not in I/O function");
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}
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} else {
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cpu->tcg_exit_req = 1;
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}
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}
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}
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CPUInterruptHandler cpu_interrupt_handler = tcg_handle_interrupt;
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#endif
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