cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kvm.c (1172B)

      1// SPDX-License-Identifier: GPL-2.0
      2
      3#include <linux/entry-kvm.h>
      4#include <linux/kvm_host.h>
      5
      6static int xfer_to_guest_mode_work(struct kvm_vcpu *vcpu, unsigned long ti_work)
      7{
      8	do {
      9		int ret;
     10
     11		if (ti_work & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) {
     12			kvm_handle_signal_exit(vcpu);
     13			return -EINTR;
     14		}
     15
     16		if (ti_work & _TIF_NEED_RESCHED)
     17			schedule();
     18
     19		if (ti_work & _TIF_NOTIFY_RESUME)
     20			resume_user_mode_work(NULL);
     21
     22		ret = arch_xfer_to_guest_mode_handle_work(vcpu, ti_work);
     23		if (ret)
     24			return ret;
     25
     26		ti_work = read_thread_flags();
     27	} while (ti_work & XFER_TO_GUEST_MODE_WORK || need_resched());
     28	return 0;
     29}
     30
     31int xfer_to_guest_mode_handle_work(struct kvm_vcpu *vcpu)
     32{
     33	unsigned long ti_work;
     34
     35	/*
     36	 * This is invoked from the outer guest loop with interrupts and
     37	 * preemption enabled.
     38	 *
     39	 * KVM invokes xfer_to_guest_mode_work_pending() with interrupts
     40	 * disabled in the inner loop before going into guest mode. No need
     41	 * to disable interrupts here.
     42	 */
     43	ti_work = read_thread_flags();
     44	if (!(ti_work & XFER_TO_GUEST_MODE_WORK))
     45		return 0;
     46
     47	return xfer_to_guest_mode_work(vcpu, ti_work);
     48}
     49EXPORT_SYMBOL_GPL(xfer_to_guest_mode_handle_work);