i386/xen: implement HYPERVISOR_sched_op, SCHEDOP_shutdown
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>
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@ -12,6 +12,7 @@
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#ifndef QEMU_SYSEMU_KVM_XEN_H
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#define QEMU_SYSEMU_KVM_XEN_H
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int kvm_xen_soft_reset(void);
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uint32_t kvm_xen_get_caps(void);
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#define kvm_xen_has_cap(cap) (!!(kvm_xen_get_caps() & \
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@ -8,3 +8,4 @@ kvm_x86_update_msi_routes(int num) "Updated %d MSI routes"
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# xen-emu.c
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kvm_xen_hypercall(int cpu, uint8_t cpl, uint64_t input, uint64_t a0, uint64_t a1, uint64_t a2, uint64_t ret) "xen_hypercall: cpu %d cpl %d input %" PRIu64 " a0 0x%" PRIx64 " a1 0x%" PRIx64 " a2 0x%" PRIx64" ret 0x%" PRIx64
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kvm_xen_soft_reset(void) ""
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@ -11,14 +11,17 @@
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#include "qemu/osdep.h"
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#include "qemu/log.h"
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#include "qemu/main-loop.h"
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#include "sysemu/kvm_int.h"
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#include "sysemu/kvm_xen.h"
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#include "kvm/kvm_i386.h"
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#include "exec/address-spaces.h"
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#include "xen-emu.h"
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#include "trace.h"
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#include "sysemu/runstate.h"
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#include "hw/xen/interface/version.h"
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#include "hw/xen/interface/sched.h"
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static int kvm_gva_rw(CPUState *cs, uint64_t gva, void *_buf, size_t sz,
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bool is_write)
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@ -170,6 +173,75 @@ static bool kvm_xen_hcall_xen_version(struct kvm_xen_exit *exit, X86CPU *cpu,
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return true;
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}
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int kvm_xen_soft_reset(void)
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{
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assert(qemu_mutex_iothread_locked());
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trace_kvm_xen_soft_reset();
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/* Nothing to reset... yet. */
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return 0;
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}
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static int schedop_shutdown(CPUState *cs, uint64_t arg)
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{
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struct sched_shutdown shutdown;
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int ret = 0;
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/* No need for 32/64 compat handling */
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qemu_build_assert(sizeof(shutdown) == 4);
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if (kvm_copy_from_gva(cs, arg, &shutdown, sizeof(shutdown))) {
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return -EFAULT;
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}
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switch (shutdown.reason) {
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case SHUTDOWN_crash:
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cpu_dump_state(cs, stderr, CPU_DUMP_CODE);
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qemu_system_guest_panicked(NULL);
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break;
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case SHUTDOWN_reboot:
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qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
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break;
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case SHUTDOWN_poweroff:
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qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
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break;
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case SHUTDOWN_soft_reset:
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qemu_mutex_lock_iothread();
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ret = kvm_xen_soft_reset();
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qemu_mutex_unlock_iothread();
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static bool kvm_xen_hcall_sched_op(struct kvm_xen_exit *exit, X86CPU *cpu,
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int cmd, uint64_t arg)
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{
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CPUState *cs = CPU(cpu);
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int err = -ENOSYS;
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switch (cmd) {
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case SCHEDOP_shutdown:
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err = schedop_shutdown(cs, arg);
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break;
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default:
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return false;
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}
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exit->u.hcall.result = err;
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return true;
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}
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static bool do_kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit)
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{
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uint16_t code = exit->u.hcall.input;
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@ -180,6 +252,9 @@ static bool do_kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit)
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}
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switch (code) {
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case __HYPERVISOR_sched_op:
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return kvm_xen_hcall_sched_op(exit, cpu, exit->u.hcall.params[0],
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exit->u.hcall.params[1]);
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case __HYPERVISOR_xen_version:
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return kvm_xen_hcall_xen_version(exit, cpu, exit->u.hcall.params[0],
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exit->u.hcall.params[1]);
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