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xen: changes to hvm code in order to support PVH guests

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On PVH we don't need to init the shared info page, or disable emulated
devices. Also, make sure PV IPIs are set before starting the APs.

Approved by: gibbs
Sponsored by: Citrix Systems R&D

x86/xen/hvm.c:
 - Return early from functions that are no-ops on Xen PVH guests.
 - In order to make sure PV IPIs are setup before AP startup,
   initialize them in SI_SUB_SMP-1.
This commit is contained in:
royger 2014-03-11 10:26:53 +00:00
parent 419270d8a7
commit b9559720d5
1 changed files with 42 additions and 5 deletions
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47
sys/x86/xen/hvm.c
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@ -350,7 +350,7 @@ xen_setup_cpus(void)
{
int i;
if (!xen_hvm_domain() || !xen_vector_callback_enabled)
if (!xen_vector_callback_enabled)
return;
#ifdef __amd64__
@ -422,6 +422,14 @@ xen_hvm_init_shared_info_page(void)
{
struct xen_add_to_physmap xatp;
if (xen_pv_domain()) {
/*
* Already setup in the PV case, shared_info is passed inside
* of the start_info struct at start of day.
*/
return;
}
if (HYPERVISOR_shared_info == NULL) {
HYPERVISOR_shared_info = malloc(PAGE_SIZE, M_XENHVM, M_NOWAIT);
if (HYPERVISOR_shared_info == NULL)
@ -498,6 +506,15 @@ enum {
static void
xen_hvm_disable_emulated_devices(void)
{
if (xen_pv_domain()) {
/*
* No emulated devices in the PV case, so no need to unplug
* anything.
*/
return;
}
if (inw(XEN_MAGIC_IOPORT) != XMI_MAGIC)
return;
@ -522,9 +539,19 @@ xen_hvm_init(enum xen_hvm_init_type init_type)
if (error != 0)
return;
/*
* If xen_domain_type is not set at this point
* it means we are inside a (PV)HVM guest, because
* for PVH the guest type is set much earlier
* (see hammer_time_xen).
*/
if (!xen_domain()) {
xen_domain_type = XEN_HVM_DOMAIN;
vm_guest = VM_GUEST_XEN;
}
setup_xen_features();
cpu_ops = xen_hvm_cpu_ops;
vm_guest = VM_GUEST_XEN;
break;
case XEN_HVM_INIT_RESUME:
if (error != 0)
@ -539,9 +566,15 @@ xen_hvm_init(enum xen_hvm_init_type init_type)
}
xen_vector_callback_enabled = 0;
xen_domain_type = XEN_HVM_DOMAIN;
xen_hvm_init_shared_info_page();
xen_hvm_set_callback(NULL);
/*
* On (PV)HVM domains we need to request the hypervisor to
* fill the shared info page, for PVH guest the shared_info page
* is passed inside the start_info struct and is already set, so this
* functions are no-ops.
*/
xen_hvm_init_shared_info_page();
xen_hvm_disable_emulated_devices();
}
@ -573,6 +606,9 @@ xen_set_vcpu_id(void)
struct pcpu *pc;
int i;
if (!xen_hvm_domain())
return;
/* Set vcpu_id to acpi_id */
CPU_FOREACH(i) {
pc = pcpu_find(i);
@ -616,7 +652,8 @@ xen_hvm_cpu_init(void)
SYSINIT(xen_hvm_init, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, xen_hvm_sysinit, NULL);
#ifdef SMP
SYSINIT(xen_setup_cpus, SI_SUB_SMP, SI_ORDER_FIRST, xen_setup_cpus, NULL);
/* We need to setup IPIs before APs are started */
SYSINIT(xen_setup_cpus, SI_SUB_SMP-1, SI_ORDER_FIRST, xen_setup_cpus, NULL);
#endif
SYSINIT(xen_hvm_cpu_init, SI_SUB_INTR, SI_ORDER_FIRST, xen_hvm_cpu_init, NULL);
SYSINIT(xen_set_vcpu_id, SI_SUB_CPU, SI_ORDER_ANY, xen_set_vcpu_id, NULL);