From f23408aac3cc8e2b333133e0d3a22235f4ab83ba Mon Sep 17 00:00:00 2001 From: Joao Martins Date: Fri, 20 Jul 2018 15:19:05 -0400 Subject: [PATCH] i386/xen: implement HYPERVISOR_sched_op 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. Signed-off-by: Joao Martins --- target/i386/xen.c | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/target/i386/xen.c b/target/i386/xen.c index 6147a92ff6..90a0a52e02 100644 --- a/target/i386/xen.c +++ b/target/i386/xen.c @@ -25,6 +25,7 @@ #include "standard-headers/xen/hvm/hvm_op.h" #include "standard-headers/xen/hvm/params.h" #include "standard-headers/xen/vcpu.h" +#include "standard-headers/xen/sched.h" #include "standard-headers/xen/event_channel.h" #define PAGE_OFFSET 0xffffffff80000000UL @@ -528,6 +529,44 @@ static int kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit, return err ? HCALL_ERR : 0; } +static int schedop_shutdown(CPUState *cs, uint64_t arg) +{ + struct sched_shutdown *shutdown; + + shutdown = gva_to_hva(cs, arg); + if (!shutdown) { + return -EFAULT; + } + + if (shutdown->reason == SHUTDOWN_crash) { + cpu_dump_state(cs, stderr, fprintf, CPU_DUMP_CODE); + qemu_system_guest_panicked(NULL); + } else if (shutdown->reason == SHUTDOWN_reboot) { + qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); + } else if (shutdown->reason == SHUTDOWN_poweroff) { + qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); + } + + return 0; +} + +static int kvm_xen_hcall_sched_op(struct kvm_xen_exit *exit, X86CPU *cpu, + int cmd, uint64_t arg) +{ + CPUState *cs = CPU(cpu); + int err = -ENOSYS; + + switch (cmd) { + case SCHEDOP_shutdown: { + err = schedop_shutdown(cs, arg); + break; + } + } + + exit->u.hcall.result = err; + return err; +} + static int __kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit) { uint16_t code = exit->u.hcall.input; @@ -536,6 +575,10 @@ static int __kvm_xen_handle_exit(X86CPU *cpu, struct kvm_xen_exit *exit) case HVMOP_set_evtchn_upcall_vector: return kvm_xen_hcall_evtchn_upcall_vector(exit, cpu, exit->u.hcall.params[0]); + case __HYPERVISOR_sched_op_compat: + case __HYPERVISOR_sched_op: + return kvm_xen_hcall_sched_op(exit, cpu, exit->u.hcall.params[0], + exit->u.hcall.params[1]); case __HYPERVISOR_event_channel_op_compat: return kvm_xen_hcall_evtchn_op_compat(exit, cpu, exit->u.hcall.params[0]); -- 2.50.1