diff options
Diffstat (limited to 'target/i386')
| -rw-r--r-- | target/i386/hyperv.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/target/i386/hyperv.c b/target/i386/hyperv.c index 0216735d67..3f76c3e266 100644 --- a/target/i386/hyperv.c +++ b/target/i386/hyperv.c @@ -12,6 +12,7 @@ */ #include "qemu/osdep.h" +#include "qemu/main-loop.h" #include "hyperv.h" #include "hw/hyperv/hyperv.h" #include "hyperv-proto.h" @@ -38,6 +39,13 @@ void hyperv_x86_synic_update(X86CPU *cpu) hyperv_synic_update(CPU(cpu), enable, msg_page_addr, event_page_addr); } +static void async_synic_update(CPUState *cs, run_on_cpu_data data) +{ + qemu_mutex_lock_iothread(); + hyperv_x86_synic_update(X86_CPU(cs)); + qemu_mutex_unlock_iothread(); +} + int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit) { CPUX86State *env = &cpu->env; @@ -48,11 +56,6 @@ int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit) return -1; } - /* - * For now just track changes in SynIC control and msg/evt pages msr's. - * When SynIC messaging/events processing will be added in future - * here we will do messages queues flushing and pages remapping. - */ switch (exit->u.synic.msr) { case HV_X64_MSR_SCONTROL: env->msr_hv_synic_control = exit->u.synic.control; @@ -67,7 +70,12 @@ int kvm_hv_handle_exit(X86CPU *cpu, struct kvm_hyperv_exit *exit) return -1; } - hyperv_x86_synic_update(cpu); + /* + * this will run in this cpu thread before it returns to KVM, but in a + * safe environment (i.e. when all cpus are quiescent) -- this is + * necessary because memory hierarchy is being changed + */ + async_safe_run_on_cpu(CPU(cpu), async_synic_update, RUN_ON_CPU_NULL); return 0; case KVM_EXIT_HYPERV_HCALL: { |