forked from Minki/linux
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>
60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/hardirq.h>
|
|
|
|
#include <asm/x86_init.h>
|
|
|
|
#include <xen/interface/xen.h>
|
|
#include <xen/interface/sched.h>
|
|
#include <xen/interface/vcpu.h>
|
|
#include <xen/features.h>
|
|
#include <xen/events.h>
|
|
|
|
#include <asm/xen/hypercall.h>
|
|
#include <asm/xen/hypervisor.h>
|
|
|
|
#include "xen-ops.h"
|
|
|
|
/*
|
|
* Force a proper event-channel callback from Xen after clearing the
|
|
* callback mask. We do this in a very simple manner, by making a call
|
|
* down into Xen. The pending flag will be checked by Xen on return.
|
|
*/
|
|
noinstr void xen_force_evtchn_callback(void)
|
|
{
|
|
(void)HYPERVISOR_xen_version(0, NULL);
|
|
}
|
|
|
|
static void xen_safe_halt(void)
|
|
{
|
|
/* Blocking includes an implicit local_irq_enable(). */
|
|
if (HYPERVISOR_sched_op(SCHEDOP_block, NULL) != 0)
|
|
BUG();
|
|
}
|
|
|
|
static void xen_halt(void)
|
|
{
|
|
if (irqs_disabled())
|
|
HYPERVISOR_vcpu_op(VCPUOP_down,
|
|
xen_vcpu_nr(smp_processor_id()), NULL);
|
|
else
|
|
xen_safe_halt();
|
|
}
|
|
|
|
static const typeof(pv_ops) xen_irq_ops __initconst = {
|
|
.irq = {
|
|
/* Initial interrupt flag handling only called while interrupts off. */
|
|
.save_fl = __PV_IS_CALLEE_SAVE(paravirt_ret0),
|
|
.irq_disable = __PV_IS_CALLEE_SAVE(paravirt_nop),
|
|
.irq_enable = __PV_IS_CALLEE_SAVE(paravirt_BUG),
|
|
|
|
.safe_halt = xen_safe_halt,
|
|
.halt = xen_halt,
|
|
},
|
|
};
|
|
|
|
void __init xen_init_irq_ops(void)
|
|
{
|
|
pv_ops.irq = xen_irq_ops.irq;
|
|
x86_init.irqs.intr_init = xen_init_IRQ;
|
|
}
|