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i386/xen: handle VCPUOP_register_vcpu_info

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Handle the hypercall to set a per vcpu info, and also wire up the default
vcpu_info in the shared_info page for the first 32 vCPUs.

To avoid deadlock within KVM a vCPU thread must set its *own* vcpu_info
rather than it being set from the context in which the hypercall is
invoked.

Add the vcpu_info (and default) GPA to the vmstate_x86_cpu for migration,
and restore it in kvm_arch_put_registers() appropriately.

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
Joao Martins 2018-06-29 10:54:50 -04:00 • committed by David Woodhouse
parent d70bd6a485
commit c345104cd1
6 changed files with 191 additions and 3 deletions
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17
target/i386/kvm/kvm.c
View file

@ -4750,6 +4750,15 @@ int kvm_arch_put_registers(CPUState *cpu, int level)
kvm_arch_set_tsc_khz(cpu);
}
#ifdef CONFIG_XEN_EMU
if (xen_mode == XEN_EMULATE && level == KVM_PUT_FULL_STATE) {
ret = kvm_put_xen_state(cpu);
if (ret < 0) {
return ret;
}
}
#endif
ret = kvm_getput_regs(x86_cpu, 1);
if (ret < 0) {
return ret;
@ -4849,6 +4858,14 @@ int kvm_arch_get_registers(CPUState *cs)
if (ret < 0) {
goto out;
}
#ifdef CONFIG_XEN_EMU
if (xen_mode == XEN_EMULATE) {
ret = kvm_get_xen_state(cs);
if (ret < 0) {
goto out;
}
}
#endif
ret = 0;
out:
cpu_sync_bndcs_hflags(&cpu->env);