From: Andrey Smetanin <asmetanin@xxxxxxxxxxxxx>
Synic 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 <asmetanin@xxxxxxxxxxxxx>
Reviewed-by: Roman Kagan <rkagan@xxxxxxxxxxxxx>
Signed-off-by: Denis V. Lunev <den@xxxxxxxxxx>
CC: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
CC: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
CC: Gleb Natapov <gleb@xxxxxxxxxx>
CC: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
arch/powerpc/kvm/mpic.c | 18 +++
arch/s390/kvm/interrupt.c | 18 +++
arch/x86/include/asm/kvm_host.h | 14 +++
arch/x86/kvm/hyperv.c | 266 ++++++++++++++++++++++++++++++++++++++++
arch/x86/kvm/hyperv.h | 20 +++
arch/x86/kvm/irq_comm.c | 16 +++
arch/x86/kvm/lapic.c | 15 ++-
arch/x86/kvm/lapic.h | 5 +
arch/x86/kvm/x86.c | 4 +
drivers/hv/hyperv_vmbus.h | 5 -
include/linux/kvm_host.h | 12 ++
include/uapi/linux/hyperv.h | 12 ++
include/uapi/linux/kvm.h | 8 ++
virt/kvm/arm/vgic.c | 18 +++
virt/kvm/eventfd.c | 35 +++++-
virt/kvm/irqchip.c | 24 +++-
16 files changed, 475 insertions(+), 15 deletions(-)
diff --git a/arch/powerpc/kvm/mpic.c b/arch/powerpc/kvm/mpic.c
index 6249cdc..01e7fb4 100644
--- a/arch/powerpc/kvm/mpic.c
+++ b/arch/powerpc/kvm/mpic.c
@@ -1850,3 +1850,21 @@ int kvm_set_routing_entry(struct kvm_kernel_irq_routing_entry *e,
out:
return r;
}
+
+/* Hyper-V Synic not implemented */
+int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int irq_source_id, int level,
+ bool line_status)
+{
+ return -ENOTSUP;
+}
+
+int kvm_hv_get_sint_gsi(struct kvm_vcpu *vcpu, u32 sint)
+{
+ return -ENOTSUP;
+}
+
+int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vcpu_id, u32 sint, int gsi)
+{
+ return -ENOTSUP;
+}
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 5c2c169..7fa8d9d 100644
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -2285,3 +2285,21 @@ int kvm_s390_get_irq_state(struct kvm_vcpu *vcpu, __u8 __user *buf, int len)
return n;
}
+
+/* Hyper-V Synic not implemented */
+int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int irq_source_id, int level,
+ bool line_status)
+{
+ return -ENOTSUP;
+}
+
+int kvm_hv_get_sint_gsi(struct kvm_vcpu *vcpu, u32 sint)
+{
+ return -ENOTSUP;
+}
+
+int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vcpu_id, u32 sint, int gsi)
+{
+ return -ENOTSUP;
+}
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index cdbdb55..e614a543 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 */
+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..15c3c02 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -23,13 +23,265 @@
#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_active_vector(struct kvm_vcpu_hv_synic *synic,
+ int vector, int sint_to_skip, int sint_mask)
+{
+ u64 sint_value;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(synic->sint); i++) {
+ if (i == sint_to_skip)
+ continue;
+ sint_value = synic_read_sint(synic, i);
+ if ((synic_get_sint_vector(sint_value) == vector) &&
+ ((sint_mask == 0) || (sint_value & sint_mask)))
+ 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 behavoir. The bitmaps are
+ * updated here, and atomically queried on fast paths.
+ */
+
+ if (!(data & HV_SYNIC_SINT_MASKED)) {
+ __set_bit(vector, synic->vec_bitmap);
+ if (data & HV_SYNIC_SINT_AUTO_EOI)
+ __set_bit(vector, synic->auto_eoi_bitmap);
+ } else {
+ if (!synic_has_active_vector(synic, vector, sint, 0))
+ __clear_bit(vector, synic->vec_bitmap);
+ if (!synic_has_active_vector(synic, vector, sint,
+ HV_SYNIC_SINT_AUTO_EOI))
+ __clear_bit(vector, synic->auto_eoi_bitmap);
+ }
+
+ atomic64_set(&synic->sint[sint], data);
+ return 0;
+}
+
+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, "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_notify_acked_hv_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, "set irq ret %d\n", ret);
+ return ret;
+}
+
+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);
+}
+
+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, "synic 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_notify_acked_hv_sint(vcpu, i);
+}
+
+int kvm_hv_get_sint_gsi(struct kvm_vcpu *vcpu, u32 sint)
+{
+ struct kvm_vcpu_hv_synic *synic = vcpu_to_synic(vcpu);
+ int gsi;
+
+ if (sint >= ARRAY_SIZE(synic->sint_to_gsi))
+ return -1;
+
+ gsi = atomic_read(&synic->sint_to_gsi[sint]);
+ return gsi;
+}
+
+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;
+}
+
+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 +478,13 @@ 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 +563,13 @@ 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..cd3a483 100644
--- a/arch/x86/kvm/hyperv.h
+++ b/arch/x86/kvm/hyperv.h
@@ -29,4 +29,24 @@ 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_vcpu_init(struct kvm_vcpu *vcpu);
+
#endif
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index c892289..d26baf8 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)
@@ -123,6 +125,15 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
return kvm_irq_delivery_to_apic(kvm, NULL, &irq, NULL);
}
+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);
+}
static int kvm_set_msi_inatomic(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm)
@@ -289,6 +300,11 @@ 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;
}
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 944b38a..63edbec 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.)
*/
@@ -972,6 +968,9 @@ 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 +1880,12 @@ 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 2d2c9bb..7580e9c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -958,6 +958,7 @@ 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,
@@ -2440,6 +2441,7 @@ 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:
@@ -7453,6 +7455,8 @@ 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/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
index 3d70e36..3782636 100644
--- a/drivers/hv/hyperv_vmbus.h
+++ b/drivers/hv/hyperv_vmbus.h
@@ -63,9 +63,6 @@ enum hv_cpuid_function {
/* Define version of the synthetic interrupt controller. */
#define HV_SYNIC_VERSION (1)
-/* Define the expected SynIC version. */
-#define HV_SYNIC_VERSION_1 (0x1)
-
/* Define synthetic interrupt controller message constants. */
#define HV_MESSAGE_SIZE (256)
#define HV_MESSAGE_PAYLOAD_BYTE_COUNT (240)
@@ -105,8 +102,6 @@ enum hv_message_type {
HVMSG_X64_LEGACY_FP_ERROR = 0x80010005
};
-/* Define the number of synthetic interrupt sources. */
-#define HV_SYNIC_SINT_COUNT (16)
#define HV_SYNIC_STIMER_COUNT (4)
/* Define invalid partition identifier. */
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 9596a2f..30fac73 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;
};
@@ -822,14 +828,20 @@ struct kvm_irq_ack_notifier {
int kvm_irq_map_gsi(struct kvm *kvm,
struct kvm_kernel_irq_routing_entry *entries, int gsi);
int kvm_irq_map_chip_pin(struct kvm *kvm, unsigned irqchip, unsigned pin);
+int kvm_hv_get_sint_gsi(struct kvm_vcpu *vcpu, u32 sint);
+int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vcpu_id, u32 sint, int gsi);
int kvm_set_irq(struct kvm *kvm, int irq_source_id, u32 irq, int level,
bool line_status);
int kvm_set_irq_inatomic(struct kvm *kvm, int irq_source_id, u32 irq, int level);
int kvm_set_msi(struct kvm_kernel_irq_routing_entry *irq_entry, struct kvm *kvm,
int irq_source_id, int level, bool line_status);
+int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *irq_entry,
+ struct kvm *kvm, int irq_source_id, int level,
+ bool line_status);
bool kvm_irq_has_notifier(struct kvm *kvm, unsigned irqchip, unsigned pin);
void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin);
+void kvm_notify_acked_hv_sint(struct kvm_vcpu *vcpu, u32 sint);
void kvm_register_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian);
void kvm_unregister_irq_ack_notifier(struct kvm *kvm,
diff --git a/include/uapi/linux/hyperv.h b/include/uapi/linux/hyperv.h
index e4c0a35..8a63ea7 100644
--- a/include/uapi/linux/hyperv.h
+++ b/include/uapi/linux/hyperv.h
@@ -395,4 +395,16 @@ struct hv_kvp_ip_msg {
struct hv_kvp_ipaddr_value kvp_ip_val;
} __attribute__((packed));
+/* Define the number of synthetic interrupt sources. */
+#define HV_SYNIC_SINT_COUNT (16)
+/* Define the expected SynIC version. */
+#define HV_SYNIC_VERSION_1 (0x1)
+
+#define HV_SYNIC_CONTROL_ENABLE (1ULL << 0)
+#define HV_SYNIC_SIMP_ENABLE (1ULL << 0)
+#define HV_SYNIC_SIEFP_ENABLE (1ULL << 0)
+#define HV_SYNIC_SINT_MASKED (1ULL << 16)
+#define HV_SYNIC_SINT_AUTO_EOI (1ULL << 17)
+#define HV_SYNIC_SINT_VECTOR_MASK (0xFF)
+
#endif /* _UAPI_HYPERV_H */
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;
};
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 6bd1c9b..02fbe7f 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -2527,3 +2527,21 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
{
return 0;
}
+
+/* Hyper-V Synic not implemented */
+int kvm_hv_set_sint(struct kvm_kernel_irq_routing_entry *e,
+ struct kvm *kvm, int irq_source_id, int level,
+ bool line_status)
+{
+ return -ENOTSUP;
+}
+
+int kvm_hv_get_sint_gsi(struct kvm_vcpu *vcpu, u32 sint)
+{
+ return -ENOTSUP;
+}
+
+int kvm_hv_set_sint_gsi(struct kvm *kvm, u32 vcpu_id, u32 sint, int gsi)
+{
+ return -ENOTSUP;
+}
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index b637965..0d7b705 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -192,11 +192,19 @@ irqfd_wakeup(wait_queue_t *wait, unsigned mode, int sync, void *key)
irq = irqfd->irq_entry;
} while (read_seqcount_retry(&irqfd->irq_entry_sc, seq));
/* An event has been signaled, inject an interrupt */
- if (irq.type == KVM_IRQ_ROUTING_MSI)
+ switch (irq.type) {
+ case KVM_IRQ_ROUTING_MSI:
kvm_set_msi(&irq, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1,
false);
- else
+ break;
+ case KVM_IRQ_ROUTING_HV_SINT:
+ kvm_hv_set_sint(&irq, kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
+ 1, false);
+ break;
+ default:
schedule_work(&irqfd->inject);
+ break;
+ }
srcu_read_unlock(&kvm->irq_srcu, idx);
}
@@ -248,8 +256,9 @@ static void irqfd_update(struct kvm *kvm, struct kvm_kernel_irqfd *irqfd)
e = entries;
for (i = 0; i < n_entries; ++i, ++e) {
- /* Only fast-path MSI. */
- if (e->type == KVM_IRQ_ROUTING_MSI)
+ /* Fast-path MSI and Hyper-V sint */
+ if (e->type == KVM_IRQ_ROUTING_MSI ||
+ e->type == KVM_IRQ_ROUTING_HV_SINT)
irqfd->irq_entry = *e;
}
@@ -471,6 +480,24 @@ void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin)
srcu_read_unlock(&kvm->irq_srcu, idx);
}
+void kvm_notify_acked_hv_sint(struct kvm_vcpu *vcpu, u32 sint)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct kvm_irq_ack_notifier *kian;
+ int gsi, idx;
+
+ vcpu_debug(vcpu, "synic acked sint %d\n", sint);
+
+ idx = srcu_read_lock(&kvm->irq_srcu);
+ gsi = kvm_hv_get_sint_gsi(vcpu, sint);
+ if (gsi != -1)
+ hlist_for_each_entry_rcu(kian, &kvm->irq_ack_notifier_list,
+ link)
+ if (kian->gsi == gsi)
+ kian->irq_acked(kian);
+ srcu_read_unlock(&kvm->irq_srcu, idx);
+}
+
void kvm_register_irq_ack_notifier(struct kvm *kvm,
struct kvm_irq_ack_notifier *kian)
{
diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c
index 716a1c4..1cf3d92 100644
--- a/virt/kvm/irqchip.c
+++ b/virt/kvm/irqchip.c
@@ -144,11 +144,13 @@ static int setup_routing_entry(struct kvm_irq_routing_table *rt,
/*
* Do not allow GSI to be mapped to the same irqchip more than once.
- * Allow only one to one mapping between GSI and MSI.
+ * Allow only one to one mapping between GSI and MSI/Hyper-V SINT.
*/
hlist_for_each_entry(ei, &rt->map[ue->gsi], link)
if (ei->type == KVM_IRQ_ROUTING_MSI ||
ue->type == KVM_IRQ_ROUTING_MSI ||
+ ei->type == KVM_IRQ_ROUTING_HV_SINT ||
+ ue->type == KVM_IRQ_ROUTING_HV_SINT ||
ue->u.irqchip.irqchip == ei->irqchip.irqchip)
return r;
@@ -166,6 +168,25 @@ out:
return r;
}
+static void kvm_irq_update_hv_sint_gsi(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);
+ }
+ }
+}
+
int kvm_set_irq_routing(struct kvm *kvm,
const struct kvm_irq_routing_entry *ue,
unsigned nr,
@@ -219,6 +240,7 @@ int kvm_set_irq_routing(struct kvm *kvm,
old = kvm->irq_routing;
rcu_assign_pointer(kvm->irq_routing, new);
kvm_irq_routing_update(kvm);
+ kvm_irq_update_hv_sint_gsi(kvm);
mutex_unlock(&kvm->irq_lock);
kvm_arch_irq_routing_update(kvm);
--
2.1.4
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