summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
Diffstat
-rw-r--r--Documentation/virtual/kvm/api.txt9
-rw-r--r--arch/x86/include/asm/kvm_host.h1
-rw-r--r--arch/x86/kvm/ioapic.h2
-rw-r--r--arch/x86/kvm/irq_comm.c42
-rw-r--r--arch/x86/kvm/lapic.c3
-rw-r--r--arch/x86/kvm/x86.c9
-rw-r--r--include/linux/kvm_host.h16
-rw-r--r--virt/kvm/irqchip.c12
8 files changed, 78 insertions, 16 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 0d14bf5db534..89e71648d748 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -3642,7 +3642,7 @@ KVM handlers should exit to userspace with rc = -EREMOTE.
7.5 KVM_CAP_SPLIT_IRQCHIP
Architectures: x86
-Parameters: None
+Parameters: args[0] - number of routes reserved for userspace IOAPICs
Returns: 0 on success, -1 on error
Create a local apic for each processor in the kernel. This can be used
@@ -3650,8 +3650,11 @@ instead of KVM_CREATE_IRQCHIP if the userspace VMM wishes to emulate the
IOAPIC and PIC (and also the PIT, even though this has to be enabled
separately).
-This supersedes KVM_CREATE_IRQCHIP, creating only local APICs, but no in kernel
-IOAPIC or PIC. This also enables in kernel routing of interrupt requests.
+This capability also enables in kernel routing of interrupt requests;
+when KVM_CAP_SPLIT_IRQCHIP only routes of KVM_IRQ_ROUTING_MSI type are
+used in the IRQ routing table. The first args[0] MSI routes are reserved
+for the IOAPIC pins. Whenever the LAPIC receives an EOI for these routes,
+a KVM_EXIT_IOAPIC_EOI vmexit will be reported to userspace.
Fails if VCPU has already been created, or if the irqchip is already in the
kernel (i.e. KVM_CREATE_IRQCHIP has already been called).
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index af09fa1d1be7..7a5f9debbcd8 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -688,6 +688,7 @@ struct kvm_arch {
u64 disabled_quirks;
bool irqchip_split;
+ u8 nr_reserved_ioapic_pins;
};
struct kvm_vm_stat {
diff --git a/arch/x86/kvm/ioapic.h b/arch/x86/kvm/ioapic.h
index a8842c0dee73..084617d37c74 100644
--- a/arch/x86/kvm/ioapic.h
+++ b/arch/x86/kvm/ioapic.h
@@ -9,6 +9,7 @@ struct kvm;
struct kvm_vcpu;
#define IOAPIC_NUM_PINS KVM_IOAPIC_NUM_PINS
+#define MAX_NR_RESERVED_IOAPIC_PINS KVM_MAX_IRQ_ROUTES
#define IOAPIC_VERSION_ID 0x11 /* IOAPIC version */
#define IOAPIC_EDGE_TRIG 0
#define IOAPIC_LEVEL_TRIG 1
@@ -121,5 +122,6 @@ int kvm_irq_delivery_to_apic(struct kvm *kvm, struct kvm_lapic *src,
int kvm_get_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state);
int kvm_set_ioapic(struct kvm *kvm, struct kvm_ioapic_state *state);
void kvm_ioapic_scan_entry(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
+void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap);
#endif
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c
index 67f6b62a6814..177460998bb0 100644
--- a/arch/x86/kvm/irq_comm.c
+++ b/arch/x86/kvm/irq_comm.c
@@ -335,3 +335,45 @@ int kvm_setup_empty_irq_routing(struct kvm *kvm)
{
return kvm_set_irq_routing(kvm, empty_routing, 0, 0);
}
+
+void kvm_arch_irq_routing_update(struct kvm *kvm)
+{
+ if (ioapic_in_kernel(kvm) || !irqchip_in_kernel(kvm))
+ return;
+ kvm_make_scan_ioapic_request(kvm);
+}
+
+void kvm_scan_ioapic_routes(struct kvm_vcpu *vcpu, u64 *eoi_exit_bitmap)
+{
+ struct kvm *kvm = vcpu->kvm;
+ struct kvm_kernel_irq_routing_entry *entry;
+ struct kvm_irq_routing_table *table;
+ u32 i, nr_ioapic_pins;
+ int idx;
+
+ /* kvm->irq_routing must be read after clearing
+ * KVM_SCAN_IOAPIC. */
+ smp_mb();
+ idx = srcu_read_lock(&kvm->irq_srcu);
+ table = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
+ nr_ioapic_pins = min_t(u32, table->nr_rt_entries,
+ kvm->arch.nr_reserved_ioapic_pins);
+ for (i = 0; i < nr_ioapic_pins; ++i) {
+ hlist_for_each_entry(entry, &table->map[i], link) {
+ u32 dest_id, dest_mode;
+
+ if (entry->type != KVM_IRQ_ROUTING_MSI)
+ continue;
+ dest_id = (entry->msi.address_lo >> 12) & 0xff;
+ dest_mode = (entry->msi.address_lo >> 2) & 0x1;
+ if (kvm_apic_match_dest(vcpu, NULL, 0, dest_id,
+ dest_mode)) {
+ u32 vector = entry->msi.data & 0xff;
+
+ __set_bit(vector,
+ (unsigned long *) eoi_exit_bitmap);
+ }
+ }
+ }
+ srcu_read_unlock(&kvm->irq_srcu, idx);
+}
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index ef70f6f3a37a..2f4c0d0cbe0a 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -209,8 +209,7 @@ out:
if (old)
kfree_rcu(old, rcu);
- if (ioapic_in_kernel(kvm))
- kvm_vcpu_request_scan_ioapic(kvm);
+ kvm_make_scan_ioapic_request(kvm);
}
static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 27429daa054e..4aeed2086c5e 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3558,6 +3558,9 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
break;
case KVM_CAP_SPLIT_IRQCHIP: {
mutex_lock(&kvm->lock);
+ r = -EINVAL;
+ if (cap->args[0] > MAX_NR_RESERVED_IOAPIC_PINS)
+ goto split_irqchip_unlock;
r = -EEXIST;
if (irqchip_in_kernel(kvm))
goto split_irqchip_unlock;
@@ -3569,6 +3572,7 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
/* Pairs with irqchip_in_kernel. */
smp_wmb();
kvm->arch.irqchip_split = true;
+ kvm->arch.nr_reserved_ioapic_pins = cap->args[0];
r = 0;
split_irqchip_unlock:
mutex_unlock(&kvm->lock);
@@ -6167,7 +6171,10 @@ static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
memset(vcpu->arch.eoi_exit_bitmap, 0, 256 / 8);
- kvm_ioapic_scan_entry(vcpu, vcpu->arch.eoi_exit_bitmap);
+ if (irqchip_split(vcpu->kvm))
+ kvm_scan_ioapic_routes(vcpu, vcpu->arch.eoi_exit_bitmap);
+ else
+ kvm_ioapic_scan_entry(vcpu, vcpu->arch.eoi_exit_bitmap);
kvm_x86_ops->load_eoi_exitmap(vcpu);
}
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 3b33215ed447..d754f2d826e9 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -330,6 +330,18 @@ struct kvm_kernel_irq_routing_entry {
struct hlist_node link;
};
+#ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
+struct kvm_irq_routing_table {
+ int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
+ u32 nr_rt_entries;
+ /*
+ * Array indexed by gsi. Each entry contains list of irq chips
+ * the gsi is connected to.
+ */
+ struct hlist_head map[0];
+};
+#endif
+
#ifndef KVM_PRIVATE_MEM_SLOTS
#define KVM_PRIVATE_MEM_SLOTS 0
#endif
@@ -456,10 +468,14 @@ void vcpu_put(struct kvm_vcpu *vcpu);
#ifdef __KVM_HAVE_IOAPIC
void kvm_vcpu_request_scan_ioapic(struct kvm *kvm);
+void kvm_arch_irq_routing_update(struct kvm *kvm);
#else
static inline void kvm_vcpu_request_scan_ioapic(struct kvm *kvm)
{
}
+static inline void kvm_arch_irq_routing_update(struct kvm *kvm)
+{
+}
#endif
#ifdef CONFIG_HAVE_KVM_IRQFD
diff --git a/virt/kvm/irqchip.c b/virt/kvm/irqchip.c
index d7ea8e20dae4..716a1c4db528 100644
--- a/virt/kvm/irqchip.c
+++ b/virt/kvm/irqchip.c
@@ -31,16 +31,6 @@
#include <trace/events/kvm.h>
#include "irq.h"
-struct kvm_irq_routing_table {
- int chip[KVM_NR_IRQCHIPS][KVM_IRQCHIP_NUM_PINS];
- u32 nr_rt_entries;
- /*
- * Array indexed by gsi. Each entry contains list of irq chips
- * the gsi is connected to.
- */
- struct hlist_head map[0];
-};
-
int kvm_irq_map_gsi(struct kvm *kvm,
struct kvm_kernel_irq_routing_entry *entries, int gsi)
{
@@ -231,6 +221,8 @@ int kvm_set_irq_routing(struct kvm *kvm,
kvm_irq_routing_update(kvm);
mutex_unlock(&kvm->irq_lock);
+ kvm_arch_irq_routing_update(kvm);
+
synchronize_srcu_expedited(&kvm->irq_srcu);
new = old;
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-26 17:21:05 +0000