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linux/arch/x86/xen/suspend_hvm.c
Jane Malalane b1c3497e60 x86/xen: Add support for HVMOP_set_evtchn_upcall_vector
Implement support for the HVMOP_set_evtchn_upcall_vector hypercall in
order to set the per-vCPU event channel vector callback on Linux and
use it in preference of HVM_PARAM_CALLBACK_IRQ.

If the per-VCPU vector setup is successful on BSP, use this method
for the APs. If not, fallback to the global vector-type callback.

Also register callback_irq at per-vCPU event channel setup to trick
toolstack to think the domain is enlightened.

Suggested-by: "Roger Pau Monné" <roger.pau@citrix.com>
Signed-off-by: Jane Malalane <jane.malalane@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Link: https://lore.kernel.org/r/20220729070416.23306-1-jane.malalane@citrix.com
Signed-off-by: Juergen Gross <jgross@suse.com>
2022-08-12 11:28:21 +02:00

28 lines
537 B
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/types.h>
#include <xen/xen.h>
#include <xen/hvm.h>
#include <xen/features.h>
#include <xen/interface/features.h>
#include <xen/events.h>
#include "xen-ops.h"
void xen_hvm_post_suspend(int suspend_cancelled)
{
if (!suspend_cancelled) {
xen_hvm_init_shared_info();
xen_vcpu_restore();
}
if (xen_percpu_upcall) {
unsigned int cpu;
for_each_online_cpu(cpu)
BUG_ON(xen_set_upcall_vector(cpu));
} else {
xen_setup_callback_vector();
}
xen_unplug_emulated_devices();
}