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i386/xen: implement HYPERVISOR_sched_op, SCHEDOP_shutdown

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It allows to shutdown itself via hypercall with any of the 3 reasons:
  1) self-reboot
  2) shutdown
  3) crash

Implementing SCHEDOP_shutdown sub op let us handle crashes gracefully rather
than leading to triple faults if it remains unimplemented.

In addition, the SHUTDOWN_soft_reset reason is used for kexec, to reset
Xen shared pages and other enlightenments and leave a clean slate for the
new kernel without the hypervisor helpfully writing information at
unexpected addresses.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
[dwmw2: Ditch sched_op_compat which was never available for HVM guests,
        Add SCHEDOP_soft_reset]
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
Joao Martins 2018-07-20 15:19:05 -04:00 • committed by David Woodhouse
parent bedcc13924
commit 79b7067dc6
3 changed files with 77 additions and 0 deletions
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1
include/sysemu/kvm_xen.h
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@ -12,6 +12,7 @@
#ifndef QEMU_SYSEMU_KVM_XEN_H
#define QEMU_SYSEMU_KVM_XEN_H
int kvm_xen_soft_reset(void);
uint32_t kvm_xen_get_caps(void);
#define kvm_xen_has_cap(cap) (!!(kvm_xen_get_caps() & \