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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 13/31] xen/x86: allow disabling the emulated local apic
Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
Cc: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Jun Nakajima <jun.nakajima@xxxxxxxxx>
Cc: Eddie Dong <eddie.dong@xxxxxxxxx>
Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
---
xen/arch/x86/hvm/svm/svm.c | 16 +++++++++-------
xen/arch/x86/hvm/vlapic.c | 30 +++++++++++++++++++++++++-----
xen/arch/x86/hvm/vmsi.c | 6 ++++++
xen/arch/x86/hvm/vmx/vmcs.c | 14 ++++++++++++++
xen/arch/x86/hvm/vmx/vmx.c | 9 ++++++++-
5 files changed, 62 insertions(+), 13 deletions(-)
diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index 8de41fa..97dc507 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -1035,6 +1035,7 @@ static void noreturn svm_do_resume(struct vcpu *v)
struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
bool_t debug_state = v->domain->debugger_attached;
bool_t vcpu_guestmode = 0;
+ struct vlapic *vlapic = vcpu_vlapic(v);
if ( nestedhvm_enabled(v->domain) && nestedhvm_vcpu_in_guestmode(v) )
vcpu_guestmode = 1;
@@ -1058,14 +1059,14 @@ static void noreturn svm_do_resume(struct vcpu *v)
hvm_asid_flush_vcpu(v);
}
- if ( !vcpu_guestmode )
+ if ( !vcpu_guestmode && !vlapic_hw_disabled(vlapic) )
{
vintr_t intr;
/* Reflect the vlapic's TPR in the hardware vtpr */
intr = vmcb_get_vintr(vmcb);
intr.fields.tpr =
- (vlapic_get_reg(vcpu_vlapic(v), APIC_TASKPRI) & 0xFF) >> 4;
+ (vlapic_get_reg(vlapic, APIC_TASKPRI) & 0xFF) >> 4;
vmcb_set_vintr(vmcb, intr);
}
@@ -2294,6 +2295,7 @@ void svm_vmexit_handler(struct cpu_user_regs *regs)
int inst_len, rc;
vintr_t intr;
bool_t vcpu_guestmode = 0;
+ struct vlapic *vlapic = vcpu_vlapic(v);
hvm_invalidate_regs_fields(regs);
@@ -2311,11 +2313,11 @@ void svm_vmexit_handler(struct cpu_user_regs *regs)
* NB. We need to preserve the low bits of the TPR to make checked builds
* of Windows work, even though they don't actually do anything.
*/
- if ( !vcpu_guestmode ) {
+ if ( !vcpu_guestmode && !vlapic_hw_disabled(vlapic) ) {
intr = vmcb_get_vintr(vmcb);
- vlapic_set_reg(vcpu_vlapic(v), APIC_TASKPRI,
+ vlapic_set_reg(vlapic, APIC_TASKPRI,
((intr.fields.tpr & 0x0F) << 4) |
- (vlapic_get_reg(vcpu_vlapic(v), APIC_TASKPRI) & 0x0F));
+ (vlapic_get_reg(vlapic, APIC_TASKPRI) & 0x0F));
}
exit_reason = vmcb->exitcode;
@@ -2697,14 +2699,14 @@ void svm_vmexit_handler(struct cpu_user_regs *regs)
}
out:
- if ( vcpu_guestmode )
+ if ( vcpu_guestmode || vlapic_hw_disabled(vlapic) )
/* Don't clobber TPR of the nested guest. */
return;
/* The exit may have updated the TPR: reflect this in the hardware vtpr */
intr = vmcb_get_vintr(vmcb);
intr.fields.tpr =
- (vlapic_get_reg(vcpu_vlapic(v), APIC_TASKPRI) & 0xFF) >> 4;
+ (vlapic_get_reg(vlapic, APIC_TASKPRI) & 0xFF) >> 4;
vmcb_set_vintr(vmcb, intr);
}
diff --git a/xen/arch/x86/hvm/vlapic.c b/xen/arch/x86/hvm/vlapic.c
index b893b40..e355679 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 0;
+
if ( (vlapic->hw.apic_base_msr ^ value) & MSR_IA32_APICBASE_ENABLE )
{
if ( unlikely(value & MSR_IA32_APICBASE_EXTD) )
@@ -1042,8 +1045,7 @@ void vlapic_tdt_msr_set(struct vlapic *vlapic, uint64_t
value)
uint64_t guest_tsc;
struct vcpu *v = vlapic_vcpu(vlapic);
- /* may need to exclude some other conditions like vlapic->hw.disabled */
- if ( !vlapic_lvtt_tdt(vlapic) )
+ if ( !vlapic_lvtt_tdt(vlapic) || vlapic_hw_disabled(vlapic) )
{
HVM_DBG_LOG(DBG_LEVEL_VLAPIC_TIMER, "ignore tsc deadline msr write");
return;
@@ -1118,6 +1120,9 @@ static int __vlapic_accept_pic_intr(struct vcpu *v)
int vlapic_accept_pic_intr(struct vcpu *v)
{
+ if ( vlapic_hw_disabled(vcpu_vlapic(v)) )
+ return 0;
+
TRACE_2D(TRC_HVM_EMUL_LAPIC_PIC_INTR,
(v == v->domain->arch.hvm_domain.i8259_target),
v ? __vlapic_accept_pic_intr(v) : -1);
@@ -1265,6 +1270,9 @@ 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);
@@ -1281,6 +1289,9 @@ 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 )
@@ -1328,7 +1339,10 @@ 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 0;
+
/* Which vlapic to load? */
vcpuid = hvm_load_instance(h);
if ( vcpuid >= d->max_vcpus || (v = d->vcpu[vcpuid]) == NULL )
@@ -1360,7 +1374,10 @@ 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 0;
+
/* Which vlapic to load? */
vcpuid = hvm_load_instance(h);
if ( vcpuid >= d->max_vcpus || (v = d->vcpu[vcpuid]) == NULL )
@@ -1399,7 +1416,7 @@ int vlapic_init(struct vcpu *v)
HVM_DBG_LOG(DBG_LEVEL_VLAPIC, "%d", v->vcpu_id);
- if ( is_pvh_vcpu(v) )
+ if ( is_pvh_vcpu(v) || !has_vlapic(v->domain) )
{
vlapic->hw.disabled = VLAPIC_HW_DISABLED;
return 0;
@@ -1452,6 +1469,9 @@ void vlapic_destroy(struct vcpu *v)
{
struct vlapic *vlapic = vcpu_vlapic(v);
+ if ( !has_vlapic(vlapic_domain(vlapic)) )
+ 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..e6a145d 100644
--- a/xen/arch/x86/hvm/vmsi.c
+++ b/xen/arch/x86/hvm/vmsi.c
@@ -482,6 +482,9 @@ 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 +496,9 @@ 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 a0a97e7..5acb246 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -1027,6 +1027,20 @@ static int construct_vmcs(struct vcpu *v)
ASSERT(!(v->arch.hvm_vmx.exec_control & CPU_BASED_RDTSC_EXITING));
}
+ if ( !has_vlapic(d) )
+ {
+ /* Disable virtual apics, TPR */
+ v->arch.hvm_vmx.secondary_exec_control &=
+ ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES
+ | SECONDARY_EXEC_APIC_REGISTER_VIRT
+ | SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY);
+ v->arch.hvm_vmx.exec_control &= ~CPU_BASED_TPR_SHADOW;
+
+ /* In turn, disable posted interrupts. */
+ __vmwrite(PIN_BASED_VM_EXEC_CONTROL,
+ vmx_pin_based_exec_control & ~PIN_BASED_POSTED_INTERRUPT);
+ }
+
vmx_update_cpu_exec_control(v);
__vmwrite(VM_EXIT_CONTROLS, vmexit_ctl);
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index c32d863..3d242fd 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);
}
@@ -2390,7 +2396,8 @@ static void vmx_install_vlapic_mapping(struct vcpu *v)
{
paddr_t virt_page_ma, apic_page_ma;
- if ( !cpu_has_vmx_virtualize_apic_accesses )
+ if ( !cpu_has_vmx_virtualize_apic_accesses ||
+ v->domain->arch.hvm_domain.vmx.apic_access_mfn == 0 )
return;
virt_page_ma = page_to_maddr(vcpu_vlapic(v)->regs_page);
--
1.9.5 (Apple Git-50.3)
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