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e453f872b7
The initial pvops functions handling irq flags will only ever be called before interrupts are being enabled. So switch them to be dummy functions: - xen_save_fl() can always return 0 - xen_irq_disable() is a nop - xen_irq_enable() can BUG() Add some generic paravirt functions for that purpose. Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Link: https://lore.kernel.org/r/20211028072748.29862-3-jgross@suse.com Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/hardirq.h>
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#include <asm/x86_init.h>
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#include <xen/interface/xen.h>
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#include <xen/interface/sched.h>
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#include <xen/interface/vcpu.h>
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#include <xen/features.h>
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#include <xen/events.h>
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#include <asm/xen/hypercall.h>
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#include <asm/xen/hypervisor.h>
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#include "xen-ops.h"
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/*
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* Force a proper event-channel callback from Xen after clearing the
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* callback mask. We do this in a very simple manner, by making a call
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* down into Xen. The pending flag will be checked by Xen on return.
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*/
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noinstr void xen_force_evtchn_callback(void)
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{
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(void)HYPERVISOR_xen_version(0, NULL);
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}
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static void xen_safe_halt(void)
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{
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/* Blocking includes an implicit local_irq_enable(). */
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if (HYPERVISOR_sched_op(SCHEDOP_block, NULL) != 0)
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BUG();
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}
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static void xen_halt(void)
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{
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if (irqs_disabled())
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HYPERVISOR_vcpu_op(VCPUOP_down,
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xen_vcpu_nr(smp_processor_id()), NULL);
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else
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xen_safe_halt();
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}
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static const typeof(pv_ops) xen_irq_ops __initconst = {
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.irq = {
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/* Initial interrupt flag handling only called while interrupts off. */
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.save_fl = __PV_IS_CALLEE_SAVE(paravirt_ret0),
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.irq_disable = __PV_IS_CALLEE_SAVE(paravirt_nop),
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.irq_enable = __PV_IS_CALLEE_SAVE(paravirt_BUG),
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.safe_halt = xen_safe_halt,
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.halt = xen_halt,
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},
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};
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void __init xen_init_irq_ops(void)
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{
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pv_ops.irq = xen_irq_ops.irq;
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x86_init.irqs.intr_init = xen_init_IRQ;
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}
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