[PATCH v7 14/32] xen/x86: allow disabling the emulated local apic

[Roger Pau Monne <roger.pau@citrix.com>]

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Jun Nakajima <jun.nakajima@intel.com>
Cc: Eddie Dong <eddie.dong@intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
---
Changes since v6:
 - Remove stall comments.
 - Adds checks for has_vlapic in the msixtbl_pt_{un}register functions.
 - Simplify the is_pvh_domain(d) || !has_vlapic(d) to !has_vlapic(d) when
   appropriate.
 - Split parts of this patch that can be considered bug fixes to a
   pre-patch.
 - Removed Acks since the patch changed substantially.

Changes since v5:
 - Add Boris Ostrovsky Reviewed-by.

Changes since v4:
 - Split the is_pvh_domain check into two, so part of the code can be shared
   with the !has_lapic case.
 - Add Andrew Cooper Acked-by.
---
 xen/arch/x86/hvm/vlapic.c   | 27 ++++++++++++++++++++++++---
 xen/arch/x86/hvm/vmsi.c     | 12 ++++++++++++
 xen/arch/x86/hvm/vmx/vmcs.c |  5 ++++-
 xen/arch/x86/hvm/vmx/vmx.c  |  6 ++++++
 4 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index 229f122..f8a84d5 100644
--- a/xen/arch/x86/hvm/vlapic.c
+++ b/xen/arch/x86/hvm/vlapic.c
@@ -993,6 +993,9 @@ static void set_x2apic_id(struct vlapic *vlapic)
 
 bool_t vlapic_msr_set(struct vlapic *vlapic, uint64_t value)
 {
+    if ( !has_vlapic(vlapic_domain(vlapic)) )
+        return -ENODEV;
+
     if ( (vlapic->hw.apic_base_msr ^ value) & MSR_IA32_APICBASE_ENABLE )
     {
         if ( unlikely(value & MSR_IA32_APICBASE_EXTD) )
@@ -1205,6 +1208,9 @@ void vlapic_reset(struct vlapic *vlapic)
     struct vcpu *v = vlapic_vcpu(vlapic);
     int i;
 
+    if ( !has_vlapic(v->domain) )
+        return;
+
     vlapic_set_reg(vlapic, APIC_ID,  (v->vcpu_id * 2) << 24);
     vlapic_set_reg(vlapic, APIC_LVR, VLAPIC_VERSION);
 
@@ -1270,6 +1276,9 @@ static int lapic_save_hidden(struct domain *d, hvm_domain_context_t *h)
     struct vlapic *s;
     int rc = 0;
 
+    if ( !has_vlapic(d) )
+        return 0;
+
     for_each_vcpu ( d, v )
     {
         s = vcpu_vlapic(v);
@@ -1286,6 +1295,9 @@ static int lapic_save_regs(struct domain *d, hvm_domain_context_t *h)
     struct vlapic *s;
     int rc = 0;
 
+    if ( !has_vlapic(d) )
+        return 0;
+
     for_each_vcpu ( d, v )
     {
         if ( hvm_funcs.sync_pir_to_irr )
@@ -1333,7 +1345,10 @@ static int lapic_load_hidden(struct domain *d, hvm_domain_context_t *h)
     uint16_t vcpuid;
     struct vcpu *v;
     struct vlapic *s;
-    
+
+    if ( !has_vlapic(d) )
+        return -ENODEV;
+
     /* Which vlapic to load? */
     vcpuid = hvm_load_instance(h); 
     if ( vcpuid >= d->max_vcpus || (v = d->vcpu[vcpuid]) == NULL )
@@ -1365,7 +1380,10 @@ static int lapic_load_regs(struct domain *d, hvm_domain_context_t *h)
     uint16_t vcpuid;
     struct vcpu *v;
     struct vlapic *s;
-    
+
+    if ( !has_vlapic(d) )
+        return -ENODEV;
+
     /* Which vlapic to load? */
     vcpuid = hvm_load_instance(h); 
     if ( vcpuid >= d->max_vcpus || (v = d->vcpu[vcpuid]) == NULL )
@@ -1404,7 +1422,7 @@ int vlapic_init(struct vcpu *v)
 
     HVM_DBG_LOG(DBG_LEVEL_VLAPIC, "%d", v->vcpu_id);
 
-    if ( is_pvh_vcpu(v) )
+    if ( !has_vlapic(v->domain) )
     {
         vlapic->hw.disabled = VLAPIC_HW_DISABLED;
         return 0;
@@ -1457,6 +1475,9 @@ void vlapic_destroy(struct vcpu *v)
 {
     struct vlapic *vlapic = vcpu_vlapic(v);
 
+    if ( !has_vlapic(v->domain) )
+        return;
+
     tasklet_kill(&vlapic->init_sipi.tasklet);
     TRACE_0D(TRC_HVM_EMUL_LAPIC_STOP_TIMER);
     destroy_periodic_time(&vlapic->pt);
diff --git a/xen/arch/x86/hvm/vmsi.c b/xen/arch/x86/hvm/vmsi.c
index ac838a9..499151e 100644
--- a/xen/arch/x86/hvm/vmsi.c
+++ b/xen/arch/x86/hvm/vmsi.c
@@ -391,6 +391,9 @@ int msixtbl_pt_register(struct domain *d, struct pirq *pirq, uint64_t gtable)
     ASSERT(spin_is_locked(&pcidevs_lock));
     ASSERT(spin_is_locked(&d->event_lock));
 
+    if ( !has_vlapic(d) )
+        return -ENODEV;
+
     /*
      * xmalloc() with irq_disabled causes the failure of check_lock() 
      * for xenpool->lock. So we allocate an entry beforehand.
@@ -446,6 +449,9 @@ void msixtbl_pt_unregister(struct domain *d, struct pirq *pirq)
     ASSERT(spin_is_locked(&pcidevs_lock));
     ASSERT(spin_is_locked(&d->event_lock));
 
+    if ( !has_vlapic(d) )
+        return;
+
     irq_desc = pirq_spin_lock_irq_desc(pirq, NULL);
     if ( !irq_desc )
         return;
@@ -482,6 +488,9 @@ found:
 
 void msixtbl_init(struct domain *d)
 {
+    if ( !has_vlapic(d) )
+        return;
+
     INIT_LIST_HEAD(&d->arch.hvm_domain.msixtbl_list);
     spin_lock_init(&d->arch.hvm_domain.msixtbl_list_lock);
 
@@ -493,6 +502,9 @@ void msixtbl_pt_cleanup(struct domain *d)
     struct msixtbl_entry *entry, *temp;
     unsigned long flags;
 
+    if ( !has_vlapic(d) )
+        return;
+
     /* msixtbl_list_lock must be acquired with irq_disabled for check_lock() */
     local_irq_save(flags); 
     spin_lock(&d->arch.hvm_domain.msixtbl_list_lock);
diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 15b136b..42f703a 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -1002,7 +1002,7 @@ static int construct_vmcs(struct vcpu *v)
         ~(SECONDARY_EXEC_ENABLE_VM_FUNCTIONS |
           SECONDARY_EXEC_ENABLE_VIRT_EXCEPTIONS);
 
-    if ( is_pvh_domain(d) )
+    if ( !has_vlapic(d) )
     {
         /* Disable virtual apics, TPR */
         v->arch.hvm_vmx.secondary_exec_control &=
@@ -1014,7 +1014,10 @@ static int construct_vmcs(struct vcpu *v)
         /* In turn, disable posted interrupts. */
         __vmwrite(PIN_BASED_VM_EXEC_CONTROL,
                   vmx_pin_based_exec_control & ~PIN_BASED_POSTED_INTERRUPT);
+    }
 
+    if ( is_pvh_domain(d) )
+    {
         /* Unrestricted guest (real mode for EPT) */
         v->arch.hvm_vmx.secondary_exec_control &=
             ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index 63b7a24..95e787e 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -89,6 +89,9 @@ static int vmx_domain_initialise(struct domain *d)
 {
     int rc;
 
+    if ( !has_vlapic(d) )
+        return 0;
+
     if ( (rc = vmx_alloc_vlapic_mapping(d)) != 0 )
         return rc;
 
@@ -97,6 +100,9 @@ static int vmx_domain_initialise(struct domain *d)
 
 static void vmx_domain_destroy(struct domain *d)
 {
+    if ( !has_vlapic(d) )
+        return;
+
     vmx_free_vlapic_mapping(d);
 }
 
-- 
1.9.5 (Apple Git-50.3)


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