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Re: [Qemu-devel] [PATCH v3 8/9] kvm/x86: Hyper-V synthetic interrupt con
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH v3 8/9] kvm/x86: Hyper-V synthetic interrupt controller |
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Date: |
Wed, 28 Oct 2015 18:41:45 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
Hi Andrey,
just one question. Is kvm_arch_set_irq actually needed? I think
everything should work fine without it. Can you check? If so, I can
remove it myself and revert the patch that introduced the hook.
Paolo
On 22/10/2015 18:09, Andrey Smetanin wrote:
> SynIC (synthetic interrupt controller) is a lapic extension,
> which is controlled via MSRs and maintains for each vCPU
> - 16 synthetic interrupt "lines" (SINT's); each can be configured to
> trigger a specific interrupt vector optionally with auto-EOI
> semantics
> - a message page in the guest memory with 16 256-byte per-SINT message
> slots
> - an event flag page in the guest memory with 16 2048-bit per-SINT
> event flag areas
>
> The host triggers a SINT whenever it delivers a new message to the
> corresponding slot or flips an event flag bit in the corresponding area.
> The guest informs the host that it can try delivering a message by
> explicitly asserting EOI in lapic or writing to End-Of-Message (EOM)
> MSR.
>
> The userspace (qemu) triggers interrupts and receives EOM notifications
> via irqfd with resampler; for that, a GSI is allocated for each
> configured SINT, and irq_routing api is extended to support GSI-SINT
> mapping.
>
> Signed-off-by: Andrey Smetanin <address@hidden>
> Reviewed-by: Roman Kagan <address@hidden>
> Signed-off-by: Denis V. Lunev <address@hidden>
> CC: Vitaly Kuznetsov <address@hidden>
> CC: "K. Y. Srinivasan" <address@hidden>
> CC: Gleb Natapov <address@hidden>
> CC: Paolo Bonzini <address@hidden>
> CC: Roman Kagan <address@hidden>
>
> Changes v3:
> * added KVM_CAP_HYPERV_SYNIC and KVM_IRQ_ROUTING_HV_SINT notes into
> docs
>
> Changes v2:
> * do not use posted interrupts for Hyper-V SynIC AutoEOI vectors
> * add Hyper-V SynIC vectors into EOI exit bitmap
> * Hyper-V SyniIC SINT msr write logic simplified
> ---
> Documentation/virtual/kvm/api.txt | 14 ++
> arch/x86/include/asm/kvm_host.h | 14 ++
> arch/x86/kvm/hyperv.c | 297
> ++++++++++++++++++++++++++++++++++++++
> arch/x86/kvm/hyperv.h | 21 +++
> arch/x86/kvm/irq_comm.c | 34 +++++
> arch/x86/kvm/lapic.c | 18 ++-
> arch/x86/kvm/lapic.h | 5 +
> arch/x86/kvm/x86.c | 12 +-
> include/linux/kvm_host.h | 6 +
> include/uapi/linux/kvm.h | 8 +
> 10 files changed, 421 insertions(+), 8 deletions(-)
>
> diff --git a/Documentation/virtual/kvm/api.txt
> b/Documentation/virtual/kvm/api.txt
> index 092ee9f..8710418 100644
> --- a/Documentation/virtual/kvm/api.txt
> +++ b/Documentation/virtual/kvm/api.txt
> @@ -1451,6 +1451,7 @@ struct kvm_irq_routing_entry {
> struct kvm_irq_routing_irqchip irqchip;
> struct kvm_irq_routing_msi msi;
> struct kvm_irq_routing_s390_adapter adapter;
> + struct kvm_irq_routing_hv_sint hv_sint;
> __u32 pad[8];
> } u;
> };
> @@ -1459,6 +1460,7 @@ struct kvm_irq_routing_entry {
> #define KVM_IRQ_ROUTING_IRQCHIP 1
> #define KVM_IRQ_ROUTING_MSI 2
> #define KVM_IRQ_ROUTING_S390_ADAPTER 3
> +#define KVM_IRQ_ROUTING_HV_SINT 4
>
> No flags are specified so far, the corresponding field must be set to zero.
>
> @@ -1482,6 +1484,10 @@ struct kvm_irq_routing_s390_adapter {
> __u32 adapter_id;
> };
>
> +struct kvm_irq_routing_hv_sint {
> + __u32 vcpu;
> + __u32 sint;
> +};
>
> 4.53 KVM_ASSIGN_SET_MSIX_NR (deprecated)
>
> @@ -3685,3 +3691,11 @@ available, means that that the kernel has an
> implementation of the
> H_RANDOM hypercall backed by a hardware random-number generator.
> If present, the kernel H_RANDOM handler can be enabled for guest use
> with the KVM_CAP_PPC_ENABLE_HCALL capability.
> +
> +8.2 KVM_CAP_HYPERV_SYNIC
> +
> +Architectures: x86
> +This capability, if KVM_CHECK_EXTENSION indicates that it is
> +available, means that that the kernel has an implementation of the
> +Hyper-V Synthetic interrupt controller(SynIC). SynIC is used to
> +support Windows Hyper-V based guest paravirt drivers(VMBus).
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 3c6327d..8434f88 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -25,6 +25,7 @@
> #include <linux/pvclock_gtod.h>
> #include <linux/clocksource.h>
> #include <linux/irqbypass.h>
> +#include <linux/hyperv.h>
>
> #include <asm/pvclock-abi.h>
> #include <asm/desc.h>
> @@ -374,10 +375,23 @@ struct kvm_mtrr {
> struct list_head head;
> };
>
> +/* Hyper-V synthetic interrupt controller (SynIC)*/
> +struct kvm_vcpu_hv_synic {
> + u64 version;
> + u64 control;
> + u64 msg_page;
> + u64 evt_page;
> + atomic64_t sint[HV_SYNIC_SINT_COUNT];
> + atomic_t sint_to_gsi[HV_SYNIC_SINT_COUNT];
> + DECLARE_BITMAP(auto_eoi_bitmap, 256);
> + DECLARE_BITMAP(vec_bitmap, 256);
> +};
> +
> /* Hyper-V per vcpu emulation context */
> struct kvm_vcpu_hv {
> u64 hv_vapic;
> s64 runtime_offset;
> + struct kvm_vcpu_hv_synic synic;
> };
>
> struct kvm_vcpu_arch {
> diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
> index 62cf8c9..8ff71f3 100644
> --- a/arch/x86/kvm/hyperv.c
> +++ b/arch/x86/kvm/hyperv.c
> @@ -23,13 +23,296 @@
>
> #include "x86.h"
> #include "lapic.h"
> +#include "ioapic.h"
> #include "hyperv.h"
>
> #include <linux/kvm_host.h>
> +#include <asm/apicdef.h>
> #include <trace/events/kvm.h>
>
> #include "trace.h"
>
> +static inline u64 synic_read_sint(struct kvm_vcpu_hv_synic *synic, int sint)
> +{
> + return atomic64_read(&synic->sint[sint]);
> +}
> +
> +static inline int synic_get_sint_vector(u64 sint_value)
> +{
> + if (sint_value & HV_SYNIC_SINT_MASKED)
> + return -1;
> + return sint_value & HV_SYNIC_SINT_VECTOR_MASK;
> +}
> +
> +static bool synic_has_vector_connected(struct kvm_vcpu_hv_synic *synic,
> + int vector)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
> + if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
> + return true;
> + }
> + return false;
> +}
> +
> +static bool synic_has_vector_auto_eoi(struct kvm_vcpu_hv_synic *synic,
> + int vector)
> +{
> + int i;
> + u64 sint_value;
> +
> + for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
> + sint_value = synic_read_sint(synic, i);
> + if (synic_get_sint_vector(sint_value) == vector &&
> + sint_value & HV_SYNIC_SINT_AUTO_EOI)
> + return true;
> + }
> + return false;
> +}
> +
> +static int synic_set_sint(struct kvm_vcpu_hv_synic *synic, int sint, u64
> data)
> +{
> + int vector;
> +
> + vector = data & HV_SYNIC_SINT_VECTOR_MASK;
> + if (vector < 16)
> + return 1;
> + /*
> + * Guest may configure multiple SINTs to use the same vector, so
> + * we maintain a bitmap of vectors handled by synic, and a
> + * bitmap of vectors with auto-eoi behavior. The bitmaps are
> + * updated here, and atomically queried on fast paths.
> + */
> +
> + atomic64_set(&synic->sint[sint], data);
> +
> + if (synic_has_vector_connected(synic, vector))
> + __set_bit(vector, synic->vec_bitmap);
> + else
> + __clear_bit(vector, synic->vec_bitmap);
> +
> + if (synic_has_vector_auto_eoi(synic, vector))
> + __set_bit(vector, synic->auto_eoi_bitmap);
> + else
> + __clear_bit(vector, synic->auto_eoi_bitmap);
> +
> + /* Load SynIC vectors into EOI exit bitmap */
> + kvm_make_request(KVM_REQ_SCAN_IOAPIC, synic_to_vcpu(synic));
> + return 0;
> +}
> +
> +static struct kvm_vcpu_hv_synic *synic_get(struct kvm *kvm, u32 vcpu_id)
> +{
> + struct kvm_vcpu *vcpu;
> +
> + if (vcpu_id >= atomic_read(&kvm->online_vcpus))
> + return NULL;
> + vcpu = kvm_get_vcpu(kvm, vcpu_id);
> + if (!vcpu)
> + return NULL;
> +
> + return vcpu_to_synic(vcpu);
> +}
> +
> +static void kvm_hv_notify_acked_sint(struct kvm_vcpu *vcpu, u32 sint)
> +{
> + struct kvm *kvm = vcpu->kvm;
> + int gsi, idx;
> +
> + vcpu_debug(vcpu, "Hyper-V SynIC acked sint %d\n", sint);
> +
> + idx = srcu_read_lock(&kvm->irq_srcu);
> + gsi = atomic_read(&vcpu_to_synic(vcpu)->sint_to_gsi[sint]);
> + if (gsi != -1)
> + kvm_notify_acked_gsi(kvm, gsi);
> + srcu_read_unlock(&kvm->irq_srcu, idx);
> +}
> +
> +static int synic_set_msr(struct kvm_vcpu_hv_synic *synic,
> + u32 msr, u64 data, bool host)
> +{
> + struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
> + int ret;
> +
> + vcpu_debug(vcpu, "Hyper-V SynIC set msr 0x%x 0x%llx host %d\n",
> + msr, data, host);
> + ret = 0;
> + switch (msr) {
> + case HV_X64_MSR_SCONTROL:
> + synic->control = data;
> + break;
> + case HV_X64_MSR_SVERSION:
> + if (!host) {
> + ret = 1;
> + break;
> + }
> + synic->version = data;
> + break;
> + case HV_X64_MSR_SIEFP:
> + if (data & HV_SYNIC_SIEFP_ENABLE)
> + if (kvm_clear_guest(vcpu->kvm,
> + data & PAGE_MASK, PAGE_SIZE)) {
> + ret = 1;
> + break;
> + }
> + synic->evt_page = data;
> + break;
> + case HV_X64_MSR_SIMP:
> + if (data & HV_SYNIC_SIMP_ENABLE)
> + if (kvm_clear_guest(vcpu->kvm,
> + data & PAGE_MASK, PAGE_SIZE)) {
> + ret = 1;
> + break;
> + }
> + synic->msg_page = data;
> + break;
> + case HV_X64_MSR_EOM: {
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
> + kvm_hv_notify_acked_sint(vcpu, i);
> + break;
> + }
> + case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
> + ret = synic_set_sint(synic, msr - HV_X64_MSR_SINT0, data);
> + break;
> + default:
> + ret = 1;
> + break;
> + }
> + return ret;
> +}
> +
> +static int synic_get_msr(struct kvm_vcpu_hv_synic *synic, u32 msr, u64
> *pdata)
> +{
> + int ret;
> +
> + ret = 0;
> + switch (msr) {
> + case HV_X64_MSR_SCONTROL:
> + *pdata = synic->control;
> + break;
> + case HV_X64_MSR_SVERSION:
> + *pdata = synic->version;
> + break;
> + case HV_X64_MSR_SIEFP:
> + *pdata = synic->evt_page;
> + break;
> + case HV_X64_MSR_SIMP:
> + *pdata = synic->msg_page;
> + break;
> + case HV_X64_MSR_EOM:
> + *pdata = 0;
> + break;
> + case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
> + *pdata = atomic64_read(&synic->sint[msr - HV_X64_MSR_SINT0]);
> + break;
> + default:
> + ret = 1;
> + break;
> + }
> + return ret;
> +}
> +
> +int synic_set_irq(struct kvm_vcpu_hv_synic *synic, u32 sint)
> +{
> + struct kvm_vcpu *vcpu = synic_to_vcpu(synic);
> + struct kvm_lapic_irq irq;
> + int ret, vector;
> +
> + if (sint >= ARRAY_SIZE(synic->sint))
> + return -EINVAL;
> +
> + vector = synic_get_sint_vector(synic_read_sint(synic, sint));
> + if (vector < 0)
> + return -ENOENT;
> +
> + memset(&irq, 0, sizeof(irq));
> + irq.dest_id = kvm_apic_id(vcpu->arch.apic);
> + irq.dest_mode = APIC_DEST_PHYSICAL;
> + irq.delivery_mode = APIC_DM_FIXED;
> + irq.vector = vector;
> + irq.level = 1;
> +
> + ret = kvm_irq_delivery_to_apic(vcpu->kvm, NULL, &irq, NULL);
> + vcpu_debug(vcpu, "Hyper-V SynIC set irq ret %d\n", ret);
> + return ret;
> +}
> +
> +int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint)
> +{
> + struct kvm_vcpu_hv_synic *synic;
> +
> + synic = synic_get(kvm, vcpu_id);
> + if (!synic)
> + return -EINVAL;
> +
> + return synic_set_irq(synic, sint);
> +}
> +
> +void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector)
> +{
> + struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
> + int i;
> +
> + vcpu_debug(vcpu, "Hyper-V SynIC send eoi vec %d\n", vector);
> +
> + for (i = 0; i < ARRAY_SIZE(synic->sint); i++)
> + if (synic_get_sint_vector(synic_read_sint(synic, i)) == vector)
> + kvm_hv_notify_acked_sint(vcpu, i);
> +}
> +
> +static int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vcpu_id, u32 sint, int
> gsi)
> +{
> + struct kvm_vcpu_hv_synic *synic;
> +
> + synic = synic_get(kvm, vcpu_id);
> + if (!synic)
> + return -EINVAL;
> +
> + if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
> + return -EINVAL;
> +
> + atomic_set(&synic->sint_to_gsi[sint], gsi);
> + return 0;
> +}
> +
> +void kvm_hv_irq_routing_update(struct kvm *kvm)
> +{
> + struct kvm_irq_routing_table *irq_rt;
> + struct kvm_kernel_irq_routing_entry *e;
> + u32 gsi;
> +
> + irq_rt = srcu_dereference_check(kvm->irq_routing, &kvm->irq_srcu,
> + lockdep_is_held(&kvm->irq_lock));
> +
> + for (gsi = 0; gsi < irq_rt->nr_rt_entries; gsi++) {
> + hlist_for_each_entry(e, &irq_rt->map[gsi], link) {
> + if (e->type == KVM_IRQ_ROUTING_HV_SINT)
> + kvm_hv_set_sint_gsi(kvm, e->hv_sint.vcpu,
> + e->hv_sint.sint, gsi);
> + }
> + }
> +}
> +
> +static void synic_init(struct kvm_vcpu_hv_synic *synic)
> +{
> + int i;
> +
> + memset(synic, 0, sizeof(*synic));
> + synic->version = HV_SYNIC_VERSION_1;
> + for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
> + atomic64_set(&synic->sint[i], HV_SYNIC_SINT_MASKED);
> + atomic_set(&synic->sint_to_gsi[i], -1);
> + }
> +}
> +
> +void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu)
> +{
> + synic_init(vcpu_to_synic(vcpu));
> +}
> +
> static bool kvm_hv_msr_partition_wide(u32 msr)
> {
> bool r = false;
> @@ -226,6 +509,13 @@ static int kvm_hv_set_msr(struct kvm_vcpu *vcpu, u32
> msr, u64 data, bool host)
> return 1;
> hv->runtime_offset = data - current_task_runtime_100ns();
> break;
> + case HV_X64_MSR_SCONTROL:
> + case HV_X64_MSR_SVERSION:
> + case HV_X64_MSR_SIEFP:
> + case HV_X64_MSR_SIMP:
> + case HV_X64_MSR_EOM:
> + case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
> + return synic_set_msr(vcpu_to_synic(vcpu), msr, data, host);
> default:
> vcpu_unimpl(vcpu, "Hyper-V uhandled wrmsr: 0x%x data 0x%llx\n",
> msr, data);
> @@ -304,6 +594,13 @@ static int kvm_hv_get_msr(struct kvm_vcpu *vcpu, u32
> msr, u64 *pdata)
> case HV_X64_MSR_VP_RUNTIME:
> data = current_task_runtime_100ns() + hv->runtime_offset;
> break;
> + case HV_X64_MSR_SCONTROL:
> + case HV_X64_MSR_SVERSION:
> + case HV_X64_MSR_SIEFP:
> + case HV_X64_MSR_SIMP:
> + case HV_X64_MSR_EOM:
> + case HV_X64_MSR_SINT0 ... HV_X64_MSR_SINT15:
> + return synic_get_msr(vcpu_to_synic(vcpu), msr, pdata);
> default:
> vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
> return 1;
> diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
> index c7bce55..8668612 100644
> --- a/arch/x86/kvm/hyperv.h
> +++ b/arch/x86/kvm/hyperv.h
> @@ -29,4 +29,25 @@ int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr,
> u64 *pdata);
> bool kvm_hv_hypercall_enabled(struct kvm *kvm);
> int kvm_hv_hypercall(struct kvm_vcpu *vcpu);
>
> +int kvm_hv_synic_set_irq(struct kvm *kvm, u32 vcpu_id, u32 sint);
> +void kvm_hv_synic_send_eoi(struct kvm_vcpu *vcpu, int vector);
> +
> +static inline struct kvm_vcpu_hv_synic *vcpu_to_synic(struct kvm_vcpu *vcpu)
> +{
> + return &vcpu->arch.hyperv.synic;
> +}
> +
> +static inline struct kvm_vcpu *synic_to_vcpu(struct kvm_vcpu_hv_synic *synic)
> +{
> + struct kvm_vcpu_hv *hv;
> + struct kvm_vcpu_arch *arch;
> +
> + hv = container_of(synic, struct kvm_vcpu_hv, synic);
> + arch = container_of(hv, struct kvm_vcpu_arch, hyperv);
> + return container_of(arch, struct kvm_vcpu, arch);
> +}
> +void kvm_hv_irq_routing_update(struct kvm *kvm);
> +
> +void kvm_hv_vcpu_init(struct kvm_vcpu *vcpu);
> +
> #endif
> diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
> index fe91f72..5e195b9 100644
> --- a/arch/x86/kvm/irq_comm.c
> +++ b/arch/x86/kvm/irq_comm.c
> @@ -33,6 +33,8 @@
>
> #include "lapic.h"
>
> +#include "hyperv.h"
> +
> static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e,
> struct kvm *kvm, int irq_source_id, int level,
> bool line_status)
> @@ -251,6 +253,16 @@ void kvm_fire_mask_notifiers(struct kvm *kvm, unsigned
> irqchip, unsigned pin,
> srcu_read_unlock(&kvm->irq_srcu, idx);
> }
>
> +static int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e,
> + struct kvm *kvm, int irq_source_id, int level,
> + bool line_status)
> +{
> + if (!level)
> + return -1;
> +
> + return kvm_hv_synic_set_irq(kvm, e->hv_sint.vcpu, e->hv_sint.sint);
> +}
> +
> int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
> const struct kvm_irq_routing_entry *ue)
> {
> @@ -289,6 +301,11 @@ int kvm_set_routing_entry(struct
> kvm_kernel_irq_routing_entry *e,
> e->msi.address_hi = ue->u.msi.address_hi;
> e->msi.data = ue->u.msi.data;
> break;
> + case KVM_IRQ_ROUTING_HV_SINT:
> + e->set = kvm_hv_set_sint;
> + e->hv_sint.vcpu = ue->u.hv_sint.vcpu;
> + e->hv_sint.sint = ue->u.hv_sint.sint;
> + break;
> default:
> goto out;
> }
> @@ -405,3 +422,20 @@ void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu,
> }
> srcu_read_unlock(&kvm->irq_srcu, idx);
> }
> +
> +int kvm_arch_set_irq(struct kvm_kernel_irq_routing_entry *irq, struct kvm
> *kvm,
> + int irq_source_id, int level, bool line_status)
> +{
> + switch (irq->type) {
> + case KVM_IRQ_ROUTING_HV_SINT:
> + return kvm_hv_set_sint(irq, kvm, irq_source_id, level,
> + line_status);
> + default:
> + return -EWOULDBLOCK;
> + }
> +}
> +
> +void kvm_arch_irq_routing_update(struct kvm *kvm)
> +{
> + kvm_hv_irq_routing_update(kvm);
> +}
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index dc03a01..3132478 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -41,6 +41,7 @@
> #include "trace.h"
> #include "x86.h"
> #include "cpuid.h"
> +#include "hyperv.h"
>
> #ifndef CONFIG_X86_64
> #define mod_64(x, y) ((x) - (y) * div64_u64(x, y))
> @@ -128,11 +129,6 @@ static inline int apic_enabled(struct kvm_lapic *apic)
> (LVT_MASK | APIC_MODE_MASK | APIC_INPUT_POLARITY | \
> APIC_LVT_REMOTE_IRR | APIC_LVT_LEVEL_TRIGGER)
>
> -static inline int kvm_apic_id(struct kvm_lapic *apic)
> -{
> - return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
> -}
> -
> /* The logical map is definitely wrong if we have multiple
> * modes at the same time. (Physical map is always right.)
> */
> @@ -850,7 +846,8 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int
> delivery_mode,
> apic_clear_vector(vector, apic->regs +
> APIC_TMR);
> }
>
> - if (kvm_x86_ops->deliver_posted_interrupt)
> + if (kvm_x86_ops->deliver_posted_interrupt &&
> + !test_bit(vector, vcpu_to_synic(vcpu)->auto_eoi_bitmap))
> kvm_x86_ops->deliver_posted_interrupt(vcpu, vector);
> else {
> apic_set_irr(vector, apic);
> @@ -972,6 +969,9 @@ static int apic_set_eoi(struct kvm_lapic *apic)
> apic_clear_isr(vector, apic);
> apic_update_ppr(apic);
>
> + if (test_bit(vector, vcpu_to_synic(apic->vcpu)->vec_bitmap))
> + kvm_hv_synic_send_eoi(apic->vcpu, vector);
> +
> kvm_ioapic_send_eoi(apic, vector);
> kvm_make_request(KVM_REQ_EVENT, apic->vcpu);
> return vector;
> @@ -1881,6 +1881,12 @@ int kvm_get_apic_interrupt(struct kvm_vcpu *vcpu)
> apic_set_isr(vector, apic);
> apic_update_ppr(apic);
> apic_clear_irr(vector, apic);
> +
> + if (test_bit(vector, vcpu_to_synic(vcpu)->auto_eoi_bitmap)) {
> + apic_clear_isr(vector, apic);
> + apic_update_ppr(apic);
> + }
> +
> return vector;
> }
>
> diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
> index fde8e35d..6c64090 100644
> --- a/arch/x86/kvm/lapic.h
> +++ b/arch/x86/kvm/lapic.h
> @@ -164,6 +164,11 @@ static inline int kvm_lapic_latched_init(struct kvm_vcpu
> *vcpu)
> return kvm_vcpu_has_lapic(vcpu) && test_bit(KVM_APIC_INIT,
> &vcpu->arch.apic->pending_events);
> }
>
> +static inline int kvm_apic_id(struct kvm_lapic *apic)
> +{
> + return (kvm_apic_get_reg(apic, APIC_ID) >> 24) & 0xff;
> +}
> +
> bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector);
>
> void wait_lapic_expire(struct kvm_vcpu *vcpu);
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index fb6cfbf..b853b2df 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -959,6 +959,7 @@ static u32 emulated_msrs[] = {
> HV_X64_MSR_RESET,
> HV_X64_MSR_VP_INDEX,
> HV_X64_MSR_VP_RUNTIME,
> + HV_X64_MSR_SCONTROL,
> HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
> MSR_KVM_PV_EOI_EN,
>
> @@ -2441,6 +2442,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long
> ext)
> case KVM_CAP_HYPERV:
> case KVM_CAP_HYPERV_VAPIC:
> case KVM_CAP_HYPERV_SPIN:
> + case KVM_CAP_HYPERV_SYNIC:
> case KVM_CAP_PCI_SEGMENT:
> case KVM_CAP_DEBUGREGS:
> case KVM_CAP_X86_ROBUST_SINGLESTEP:
> @@ -6195,6 +6197,8 @@ static void process_smi(struct kvm_vcpu *vcpu)
>
> static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
> {
> + u64 eoi_exit_bitmap[4];
> +
> if (!kvm_apic_hw_enabled(vcpu->arch.apic))
> return;
>
> @@ -6205,8 +6209,10 @@ static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
> else
> kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors);
>
> - kvm_x86_ops->load_eoi_exitmap(vcpu,
> - (u64 *)vcpu->arch.ioapic_handled_vectors);
> + bitmap_or((ulong *)eoi_exit_bitmap, vcpu->arch.ioapic_handled_vectors,
> + vcpu_to_synic(vcpu)->vec_bitmap, 256);
> +
> + kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap);
> }
>
> static void kvm_vcpu_flush_tlb(struct kvm_vcpu *vcpu)
> @@ -7456,6 +7462,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
>
> vcpu->arch.pending_external_vector = -1;
>
> + kvm_hv_vcpu_init(vcpu);
> +
> return 0;
>
> fail_free_mce_banks:
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index c742e79..43b0141 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -318,6 +318,11 @@ struct kvm_s390_adapter_int {
> u32 adapter_id;
> };
>
> +struct kvm_hv_sint {
> + u32 vcpu;
> + u32 sint;
> +};
> +
> struct kvm_kernel_irq_routing_entry {
> u32 gsi;
> u32 type;
> @@ -331,6 +336,7 @@ struct kvm_kernel_irq_routing_entry {
> } irqchip;
> struct msi_msg msi;
> struct kvm_s390_adapter_int adapter;
> + struct kvm_hv_sint hv_sint;
> };
> struct hlist_node link;
> };
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index 03f3618..27ce460 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -831,6 +831,7 @@ struct kvm_ppc_smmu_info {
> #define KVM_CAP_GUEST_DEBUG_HW_WPS 120
> #define KVM_CAP_SPLIT_IRQCHIP 121
> #define KVM_CAP_IOEVENTFD_ANY_LENGTH 122
> +#define KVM_CAP_HYPERV_SYNIC 123
>
> #ifdef KVM_CAP_IRQ_ROUTING
>
> @@ -854,10 +855,16 @@ struct kvm_irq_routing_s390_adapter {
> __u32 adapter_id;
> };
>
> +struct kvm_irq_routing_hv_sint {
> + __u32 vcpu;
> + __u32 sint;
> +};
> +
> /* gsi routing entry types */
> #define KVM_IRQ_ROUTING_IRQCHIP 1
> #define KVM_IRQ_ROUTING_MSI 2
> #define KVM_IRQ_ROUTING_S390_ADAPTER 3
> +#define KVM_IRQ_ROUTING_HV_SINT 4
>
> struct kvm_irq_routing_entry {
> __u32 gsi;
> @@ -868,6 +875,7 @@ struct kvm_irq_routing_entry {
> struct kvm_irq_routing_irqchip irqchip;
> struct kvm_irq_routing_msi msi;
> struct kvm_irq_routing_s390_adapter adapter;
> + struct kvm_irq_routing_hv_sint hv_sint;
> __u32 pad[8];
> } u;
> };
>