diff mbox

[1/4] Introduce kvm_vcpu_is_bsp() function.

Message ID 1244453578-29857-2-git-send-email-gleb@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Gleb Natapov June 8, 2009, 9:32 a.m. UTC
Use it instead of open code "vcpu_id zero is BSP" assumption.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
---
 arch/ia64/kvm/kvm-ia64.c |    2 +-
 arch/ia64/kvm/vcpu.c     |    2 +-
 arch/x86/kvm/i8254.c     |    4 ++--
 arch/x86/kvm/i8259.c     |    6 +++---
 arch/x86/kvm/lapic.c     |    7 ++++---
 arch/x86/kvm/svm.c       |    4 ++--
 arch/x86/kvm/vmx.c       |    6 +++---
 arch/x86/kvm/x86.c       |    4 ++--
 include/linux/kvm_host.h |    5 +++++
 virt/kvm/ioapic.c        |    4 +++-
 virt/kvm/kvm_main.c      |    2 ++
 11 files changed, 28 insertions(+), 18 deletions(-)

Comments

Avi Kivity June 8, 2009, 11:20 a.m. UTC | #1
Gleb Natapov wrote:
> @@ -130,6 +130,7 @@ struct kvm {
>  	int nmemslots;
>  	struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
>  					KVM_PRIVATE_MEM_SLOTS];
> +	struct kvm_vcpu *bsp_vcpu;
>  	struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
>  	struct list_head vm_list;
>  	struct kvm_io_bus mmio_bus;
>   

The concept of bsp (boot processor) is limited IIUC to x86 and ia64, so 
please wrap with HAVE_KVM_IRQCHIP (which is a close approximation).

Arch maintainers, please confirm.
Hollis Blanchard June 8, 2009, 4:53 p.m. UTC | #2
On Mon, 2009-06-08 at 14:20 +0300, Avi Kivity wrote:
> Gleb Natapov wrote:
> > @@ -130,6 +130,7 @@ struct kvm {
> >  	int nmemslots;
> >  	struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
> >  					KVM_PRIVATE_MEM_SLOTS];
> > +	struct kvm_vcpu *bsp_vcpu;
> >  	struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
> >  	struct list_head vm_list;
> >  	struct kvm_io_bus mmio_bus;
> >   
> 
> The concept of bsp (boot processor) is limited IIUC to x86 and ia64

That is true.

> please wrap with HAVE_KVM_IRQCHIP (which is a close approximation).

I don't know about that... I've definitely thought about implementing an
in-kernel PIC for PowerPC. (That will make more sense as an optimization
once the processors with hypervisor support start hitting the market.)
Avi Kivity June 8, 2009, 4:57 p.m. UTC | #3
Hollis Blanchard wrote:
>> please wrap with HAVE_KVM_IRQCHIP (which is a close approximation).
>>     
>
> I don't know about that... I've definitely thought about implementing an
> in-kernel PIC for PowerPC. (That will make more sense as an optimization
> once the processors with hypervisor support start hitting the market.)
>   

Yes, wasn't such a great idea.  I guess a new symbol 
CONFIG_KVM_APIC_ARCHITECTURE which will also encapsulate the ioapic stuff.
Zhang, Xiantao June 9, 2009, 1 a.m. UTC | #4
Avi Kivity wrote:
> Gleb Natapov wrote:
>> @@ -130,6 +130,7 @@ struct kvm {
>>  	int nmemslots;
>>  	struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS + 
>> KVM_PRIVATE_MEM_SLOTS]; +	struct kvm_vcpu *bsp_vcpu;
>>  	struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
>>  	struct list_head vm_list;
>>  	struct kvm_io_bus mmio_bus;
>> 
> 
> The concept of bsp (boot processor) is limited IIUC to x86 and ia64,
> so please wrap with HAVE_KVM_IRQCHIP (which is a close approximation).
> 
> Arch maintainers, please confirm.

Yes, vcpu[0] should be the bsp for ia64 guests, even if this is not always true for real platforms.   
Xiantao--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Avi Kivity June 9, 2009, 3:35 a.m. UTC | #5
Zhang, Xiantao wrote:
>> The concept of bsp (boot processor) is limited IIUC to x86 and ia64,
>> so please wrap with HAVE_KVM_IRQCHIP (which is a close approximation).
>>
>> Arch maintainers, please confirm.
>>     
>
> Yes, vcpu[0] should be the bsp for ia64 guests, even if this is not always true for real platforms.   
>   

We are changing it to be potentially not always true for x86 as well.
diff mbox

Patch

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index 3199221..3924591 100644
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1216,7 +1216,7 @@  int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 	if (IS_ERR(vmm_vcpu))
 		return PTR_ERR(vmm_vcpu);
 
-	if (vcpu->vcpu_id == 0) {
+	if (kvm_vcpu_is_bsp(vcpu)) {
 		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
 
 		/*Set entry address for first run.*/
diff --git a/arch/ia64/kvm/vcpu.c b/arch/ia64/kvm/vcpu.c
index a2c6c15..7e7391d 100644
--- a/arch/ia64/kvm/vcpu.c
+++ b/arch/ia64/kvm/vcpu.c
@@ -830,7 +830,7 @@  static void vcpu_set_itc(struct kvm_vcpu *vcpu, u64 val)
 
 	kvm = (struct kvm *)KVM_VM_BASE;
 
-	if (vcpu->vcpu_id == 0) {
+	if (kvm_vcpu_is_bsp(vcpu)) {
 		for (i = 0; i < kvm->arch.online_vcpus; i++) {
 			v = (struct kvm_vcpu *)((char *)vcpu +
 					sizeof(struct kvm_vcpu_data) * i);
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index f91b0e3..b1d97e7 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -228,7 +228,7 @@  int pit_has_pending_timer(struct kvm_vcpu *vcpu)
 {
 	struct kvm_pit *pit = vcpu->kvm->arch.vpit;
 
-	if (pit && vcpu->vcpu_id == 0 && pit->pit_state.irq_ack)
+	if (pit && kvm_vcpu_is_bsp(vcpu) && pit->pit_state.irq_ack)
 		return atomic_read(&pit->pit_state.pit_timer.pending);
 	return 0;
 }
@@ -249,7 +249,7 @@  void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu)
 	struct kvm_pit *pit = vcpu->kvm->arch.vpit;
 	struct hrtimer *timer;
 
-	if (vcpu->vcpu_id != 0 || !pit)
+	if (!kvm_vcpu_is_bsp(vcpu) || !pit)
 		return;
 
 	timer = &pit->pit_state.pit_timer.timer;
diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c
index 2520922..95bdb83 100644
--- a/arch/x86/kvm/i8259.c
+++ b/arch/x86/kvm/i8259.c
@@ -57,7 +57,7 @@  static void pic_unlock(struct kvm_pic *s)
 	}
 
 	if (wakeup) {
-		vcpu = s->kvm->vcpus[0];
+		vcpu = s->kvm->bsp_vcpu;
 		if (vcpu)
 			kvm_vcpu_kick(vcpu);
 	}
@@ -252,7 +252,7 @@  void kvm_pic_reset(struct kvm_kpic_state *s)
 {
 	int irq, irqbase, n;
 	struct kvm *kvm = s->pics_state->irq_request_opaque;
-	struct kvm_vcpu *vcpu0 = kvm->vcpus[0];
+	struct kvm_vcpu *vcpu0 = kvm->bsp_vcpu;
 
 	if (s == &s->pics_state->pics[0])
 		irqbase = 0;
@@ -510,7 +510,7 @@  static void picdev_read(struct kvm_io_device *this,
 static void pic_irq_request(void *opaque, int level)
 {
 	struct kvm *kvm = opaque;
-	struct kvm_vcpu *vcpu = kvm->vcpus[0];
+	struct kvm_vcpu *vcpu = kvm->bsp_vcpu;
 	struct kvm_pic *s = pic_irqchip(kvm);
 	int irq = pic_get_irq(&s->pics[0]);
 
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 4bfd458..1820911 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -792,7 +792,8 @@  void kvm_lapic_set_base(struct kvm_vcpu *vcpu, u64 value)
 		vcpu->arch.apic_base = value;
 		return;
 	}
-	if (apic->vcpu->vcpu_id)
+
+	if (!kvm_vcpu_is_bsp(apic->vcpu))
 		value &= ~MSR_IA32_APICBASE_BSP;
 
 	vcpu->arch.apic_base = value;
@@ -849,7 +850,7 @@  void kvm_lapic_reset(struct kvm_vcpu *vcpu)
 	}
 	update_divide_count(apic);
 	atomic_set(&apic->lapic_timer.pending, 0);
-	if (vcpu->vcpu_id == 0)
+	if (kvm_vcpu_is_bsp(vcpu))
 		vcpu->arch.apic_base |= MSR_IA32_APICBASE_BSP;
 	apic_update_ppr(apic);
 
@@ -993,7 +994,7 @@  int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
 	u32 lvt0 = apic_get_reg(vcpu->arch.apic, APIC_LVT0);
 	int r = 0;
 
-	if (vcpu->vcpu_id == 0) {
+	if (kvm_vcpu_is_bsp(vcpu)) {
 		if (!apic_hw_enabled(vcpu->arch.apic))
 			r = 1;
 		if ((lvt0 & APIC_LVT_MASKED) == 0 &&
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 37397f6..13f6f7d 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -645,7 +645,7 @@  static int svm_vcpu_reset(struct kvm_vcpu *vcpu)
 
 	init_vmcb(svm);
 
-	if (vcpu->vcpu_id != 0) {
+	if (!kvm_vcpu_is_bsp(vcpu)) {
 		kvm_rip_write(vcpu, 0);
 		svm->vmcb->save.cs.base = svm->vcpu.arch.sipi_vector << 12;
 		svm->vmcb->save.cs.selector = svm->vcpu.arch.sipi_vector << 8;
@@ -709,7 +709,7 @@  static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
 	fx_init(&svm->vcpu);
 	svm->vcpu.fpu_active = 1;
 	svm->vcpu.arch.apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
-	if (svm->vcpu.vcpu_id == 0)
+	if (kvm_vcpu_is_bsp(&svm->vcpu))
 		svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;
 
 	return &svm->vcpu;
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7eb98e5..d95c1a5 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2344,7 +2344,7 @@  static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
 	vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
 	kvm_set_cr8(&vmx->vcpu, 0);
 	msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
-	if (vmx->vcpu.vcpu_id == 0)
+	if (kvm_vcpu_is_bsp(&vmx->vcpu))
 		msr |= MSR_IA32_APICBASE_BSP;
 	kvm_set_apic_base(&vmx->vcpu, msr);
 
@@ -2355,7 +2355,7 @@  static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
 	 * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
 	 * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4.  Sigh.
 	 */
-	if (vmx->vcpu.vcpu_id == 0) {
+	if (kvm_vcpu_is_bsp(&vmx->vcpu)) {
 		vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
 		vmcs_writel(GUEST_CS_BASE, 0x000f0000);
 	} else {
@@ -2384,7 +2384,7 @@  static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
 	vmcs_writel(GUEST_SYSENTER_EIP, 0);
 
 	vmcs_writel(GUEST_RFLAGS, 0x02);
-	if (vmx->vcpu.vcpu_id == 0)
+	if (kvm_vcpu_is_bsp(&vmx->vcpu))
 		kvm_rip_write(vcpu, 0xfff0);
 	else
 		kvm_rip_write(vcpu, 0);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c1ed485..2b8316a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -4294,7 +4294,7 @@  int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 	kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
 
 	/* Older userspace won't unhalt the vcpu on reset. */
-	if (vcpu->vcpu_id == 0 && kvm_rip_read(vcpu) == 0xfff0 &&
+	if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
 	    sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
 	    !(vcpu->arch.cr0 & X86_CR0_PE))
 		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
@@ -4565,7 +4565,7 @@  int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
 	kvm = vcpu->kvm;
 
 	vcpu->arch.mmu.root_hpa = INVALID_PAGE;
-	if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
+	if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
 		vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
 	else
 		vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index bcb94eb..4d8e222 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -130,6 +130,7 @@  struct kvm {
 	int nmemslots;
 	struct kvm_memory_slot memslots[KVM_MEMORY_SLOTS +
 					KVM_PRIVATE_MEM_SLOTS];
+	struct kvm_vcpu *bsp_vcpu;
 	struct kvm_vcpu *vcpus[KVM_MAX_VCPUS];
 	struct list_head vm_list;
 	struct kvm_io_bus mmio_bus;
@@ -547,4 +548,8 @@  static inline void kvm_irqfd_release(struct kvm *kvm) {}
 
 #endif /* CONFIG_HAVE_KVM_EVENTFD */
 
+static inline bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
+{
+	return vcpu->kvm->bsp_vcpu == vcpu;
+}
 #endif
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
index 6b00433..017d2d6 100644
--- a/virt/kvm/ioapic.c
+++ b/virt/kvm/ioapic.c
@@ -165,7 +165,9 @@  static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq)
 	/* Always delivery PIT interrupt to vcpu 0 */
 	if (irq == 0) {
 		irqe.dest_mode = 0; /* Physical mode. */
-		irqe.dest_id = ioapic->kvm->vcpus[0]->vcpu_id;
+		/* need to read apic_id from apic regiest since
+		 * it can be rewritten */
+		irqe.dest_id = ioapic->kvm->bsp_vcpu->vcpu_id;
 	}
 #endif
 	return kvm_irq_delivery_to_apic(ioapic->kvm, NULL, &irqe);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a9f62bb..9a415c5 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1732,6 +1732,8 @@  static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
 		goto vcpu_destroy;
 	}
 	kvm->vcpus[n] = vcpu;
+	if (n == 0)
+		kvm->bsp_vcpu = vcpu;
 	mutex_unlock(&kvm->lock);
 
 	/* Now it's all set up, let userspace reach it */