linux-stable/kernel/entry/kvm.c
Jens Axboe 3c532798ec tracehook: clear TIF_NOTIFY_RESUME in tracehook_notify_resume()
All the callers currently do this, clean it up and move the clearing
into tracehook_notify_resume() instead.

Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-10-17 15:04:36 -06:00

49 lines
1.2 KiB
C

// SPDX-License-Identifier: GPL-2.0
#include <linux/entry-kvm.h>
#include <linux/kvm_host.h>
static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work)
{
do {
int ret;
if (ti_work & _TIF_SIGPENDING) {
kvm_handle_signal_exit(vcpu);
return -EINTR;
}
if (ti_work & _TIF_NEED_RESCHED)
schedule();
if (ti_work & _TIF_NOTIFY_RESUME)
tracehook_notify_resume(NULL);
ret = arch_xfer_to_guest_mode_handle_work(vcpu, ti_work);
if (ret)
return ret;
ti_work = READ_ONCE(current_thread_info()->flags);
} while (ti_work & XFER_TO_GUEST_MODE_WORK || need_resched());
return 0;
}
int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu)
{
unsigned long ti_work;
/*
* This is invoked from the outer guest loop with interrupts and
* preemption enabled.
*
* KVM invokes xfer_to_guest_mode_work_pending() with interrupts
* disabled in the inner loop before going into guest mode. No need
* to disable interrupts here.
*/
ti_work = READ_ONCE(current_thread_info()->flags);
if (!(ti_work & XFER_TO_GUEST_MODE_WORK))
return 0;
return xfer_to_guest_mode_work(vcpu, ti_work);
}
EXPORT_SYMBOL_GPL(xfer_to_guest_mode_handle_work);