195801d700
The Big QEMU Lock (BQL) has many names and they are confusing. The actual QemuMutex variable is called qemu_global_mutex but it's commonly referred to as the BQL in discussions and some code comments. The locking APIs, however, are called qemu_mutex_lock_iothread() and qemu_mutex_unlock_iothread(). The "iothread" name is historic and comes from when the main thread was split into into KVM vcpu threads and the "iothread" (now called the main loop thread). I have contributed to the confusion myself by introducing a separate --object iothread, a separate concept unrelated to the BQL. The "iothread" name is no longer appropriate for the BQL. Rename the locking APIs to: - void bql_lock(void) - void bql_unlock(void) - bool bql_locked(void) There are more APIs with "iothread" in their names. Subsequent patches will rename them. There are also comments and documentation that will be updated in later patches. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Paul Durrant <paul@xen.org> Acked-by: Fabiano Rosas <farosas@suse.de> Acked-by: David Woodhouse <dwmw@amazon.co.uk> Reviewed-by: Cédric Le Goater <clg@kaod.org> Acked-by: Peter Xu <peterx@redhat.com> Acked-by: Eric Farman <farman@linux.ibm.com> Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com> Acked-by: Hyman Huang <yong.huang@smartx.com> Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com> Message-id: 20240102153529.486531-2-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/*
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* x86 FPU, MMX/3DNow!/SSE/SSE2/SSE3/SSSE3/SSE4/PNI helpers (sysemu code)
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*
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* Copyright (c) 2003 Fabrice Bellard
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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 2.1 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/main-loop.h"
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#include "cpu.h"
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#include "hw/irq.h"
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static qemu_irq ferr_irq;
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void x86_register_ferr_irq(qemu_irq irq)
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{
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ferr_irq = irq;
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}
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void fpu_check_raise_ferr_irq(CPUX86State *env)
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{
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if (ferr_irq && !(env->hflags2 & HF2_IGNNE_MASK)) {
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bql_lock();
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qemu_irq_raise(ferr_irq);
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bql_unlock();
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return;
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}
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}
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void cpu_clear_ignne(void)
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{
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CPUX86State *env = &X86_CPU(first_cpu)->env;
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env->hflags2 &= ~HF2_IGNNE_MASK;
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}
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void cpu_set_ignne(void)
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{
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CPUX86State *env = &X86_CPU(first_cpu)->env;
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assert(bql_locked());
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env->hflags2 |= HF2_IGNNE_MASK;
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/*
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* We get here in response to a write to port F0h. The chipset should
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* deassert FP_IRQ and FERR# instead should stay signaled until FPSW_SE is
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* cleared, because FERR# and FP_IRQ are two separate pins on real
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* hardware. However, we don't model FERR# as a qemu_irq, so we just
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* do directly what the chipset would do, i.e. deassert FP_IRQ.
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*/
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qemu_irq_lower(ferr_irq);
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}
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