The associated HW interrupt source is simply allocated at the OPAL/HW
level and then MASKED. KVM only needs to know about its type: LSI or
MSI.
Signed-off-by: Cédric Le Goater <c...@kaod.org>
---
arch/powerpc/include/uapi/asm/kvm.h | 5 +
arch/powerpc/kvm/book3s_xive.h | 10 ++
arch/powerpc/kvm/book3s_xive.c | 8 +-
arch/powerpc/kvm/book3s_xive_native.c | 114 +++++++++++++++++++++
Documentation/virtual/kvm/devices/xive.txt | 15 +++
5 files changed, 148 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/include/uapi/asm/kvm.h
b/arch/powerpc/include/uapi/asm/kvm.h
index b002c0c67787..a9ad99f2a11b 100644
--- a/arch/powerpc/include/uapi/asm/kvm.h
+++ b/arch/powerpc/include/uapi/asm/kvm.h
@@ -677,5 +677,10 @@ struct kvm_ppc_cpu_char {
/* POWER9 XIVE Native Interrupt Controller */
#define KVM_DEV_XIVE_GRP_CTRL 1
+#define KVM_DEV_XIVE_GRP_SOURCE 2 /* 64-bit source
attributes */
+
+/* Layout of 64-bit XIVE source attribute values */
+#define KVM_XIVE_LEVEL_SENSITIVE (1ULL << 0)
+#define KVM_XIVE_LEVEL_ASSERTED (1ULL << 1)
#endif /* __LINUX_KVM_POWERPC_H */
diff --git a/arch/powerpc/kvm/book3s_xive.h b/arch/powerpc/kvm/book3s_xive.h
index bcb1bbcf0359..f22f2d46d0f0 100644
--- a/arch/powerpc/kvm/book3s_xive.h
+++ b/arch/powerpc/kvm/book3s_xive.h
@@ -12,6 +12,13 @@
#ifdef CONFIG_KVM_XICS
#include "book3s_xics.h"
+/*
+ * The XIVE IRQ number space is aligned with the XICS IRQ number
+ * space, CPU IPIs being allocated in the first 4K.
+ */
+#define KVMPPC_XIVE_FIRST_IRQ 0
+#define KVMPPC_XIVE_NR_IRQS KVMPPC_XICS_NR_IRQS
+
/*
* State for one guest irq source.
*
@@ -253,6 +260,9 @@ extern int (*__xive_vm_h_eoi)(struct kvm_vcpu *vcpu,
unsigned long xirr);
*/
void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu);
int kvmppc_xive_debug_show_queues(struct seq_file *m, struct kvm_vcpu *vcpu);
+struct kvmppc_xive_src_block *kvmppc_xive_create_src_block(
+ struct kvmppc_xive *xive, int irq);
+void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb);
#endif /* CONFIG_KVM_XICS */
#endif /* _KVM_PPC_BOOK3S_XICS_H */
diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c
index d1cc18a5b1c4..6f950ecb3592 100644
--- a/arch/powerpc/kvm/book3s_xive.c
+++ b/arch/powerpc/kvm/book3s_xive.c
@@ -1485,8 +1485,8 @@ static int xive_get_source(struct kvmppc_xive *xive, long
irq, u64 addr)
return 0;
}
-static struct kvmppc_xive_src_block *xive_create_src_block(struct kvmppc_xive
*xive,
- int irq)
+struct kvmppc_xive_src_block *kvmppc_xive_create_src_block(
+ struct kvmppc_xive *xive, int irq)
{
struct kvm *kvm = xive->kvm;
struct kvmppc_xive_src_block *sb;
@@ -1565,7 +1565,7 @@ static int xive_set_source(struct kvmppc_xive *xive, long
irq, u64 addr)
sb = kvmppc_xive_find_source(xive, irq, &idx);
if (!sb) {
pr_devel("No source, creating source block...\n");
- sb = xive_create_src_block(xive, irq);
+ sb = kvmppc_xive_create_src_block(xive, irq);
if (!sb) {
pr_devel("Failed to create block...\n");
return -ENOMEM;
@@ -1789,7 +1789,7 @@ static void kvmppc_xive_cleanup_irq(u32 hw_num, struct
xive_irq_data *xd)
xive_cleanup_irq_data(xd);
}
-static void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb)
+void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb)
{
int i;
diff --git a/arch/powerpc/kvm/book3s_xive_native.c
b/arch/powerpc/kvm/book3s_xive_native.c
index 1f3da47a4a6a..a9b2d2d9af99 100644
--- a/arch/powerpc/kvm/book3s_xive_native.c
+++ b/arch/powerpc/kvm/book3s_xive_native.c
@@ -31,6 +31,29 @@
#include "book3s_xive.h"
+/*
+ * TODO: introduce a common template file with the XIVE native layer
+ * and the XICS-on-XIVE glue for the utility functions
+ */
+#define __x_eoi_page(xd) ((void __iomem *)((xd)->eoi_mmio))
+#define __x_trig_page(xd) ((void __iomem *)((xd)->trig_mmio))
+#define __x_readq __raw_readq
+#define __x_writeq __raw_writeq
+
+static u8 xive_vm_esb_load(struct xive_irq_data *xd, u32 offset)
+{
+ u64 val;
+
+ if (xd->flags & XIVE_IRQ_FLAG_SHIFT_BUG)
+ offset |= offset << 4;
+
+ val = __x_readq(__x_eoi_page(xd) + offset);
+#ifdef __LITTLE_ENDIAN__
+ val >>= 64-8;
+#endif
+ return (u8)val;
+}
+
static void kvmppc_xive_native_cleanup_queue(struct kvm_vcpu *vcpu, int prio)
{
struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
@@ -153,12 +176,89 @@ int kvmppc_xive_native_connect_vcpu(struct kvm_device
*dev,
return rc;
}
+static int kvmppc_xive_native_set_source(struct kvmppc_xive *xive, long irq,
+ u64 addr)
+{
+ struct kvmppc_xive_src_block *sb;
+ struct kvmppc_xive_irq_state *state;
+ u64 __user *ubufp = (u64 __user *) addr;
+ u64 val;
+ u16 idx;
+
+ pr_devel("%s irq=0x%lx\n", __func__, irq);
+
+ if (irq < KVMPPC_XIVE_FIRST_IRQ || irq >= KVMPPC_XIVE_NR_IRQS)
+ return -E2BIG;
+
+ sb = kvmppc_xive_find_source(xive, irq, &idx);
+ if (!sb) {
+ pr_debug("No source, creating source block...\n");
+ sb = kvmppc_xive_create_src_block(xive, irq);
+ if (!sb) {
+ pr_err("Failed to create block...\n");
+ return -ENOMEM;
+ }
+ }
+ state = &sb->irq_state[idx];
+
+ if (get_user(val, ubufp)) {
+ pr_err("fault getting user info !\n");
+ return -EFAULT;
+ }
+
+ /*
+ * If the source doesn't already have an IPI, allocate
+ * one and get the corresponding data
+ */
+ if (!state->ipi_number) {
+ state->ipi_number = xive_native_alloc_irq();
+ if (state->ipi_number == 0) {
+ pr_err("Failed to allocate IRQ !\n");
+ return -ENXIO;
+ }
+ xive_native_populate_irq_data(state->ipi_number,
+ &state->ipi_data);
+ pr_debug("%s allocated hw_irq=0x%x for irq=0x%lx\n", __func__,
+ state->ipi_number, irq);
+ }
+
+ arch_spin_lock(&sb->lock);
+
+ /* Restore LSI state */
+ if (val & KVM_XIVE_LEVEL_SENSITIVE) {
+ state->lsi = true;
+ if (val & KVM_XIVE_LEVEL_ASSERTED)
+ state->asserted = true;
+ pr_devel(" LSI ! Asserted=%d\n", state->asserted);
+ }
+
+ /* Mask IRQ to start with */
+ state->act_server = 0;
+ state->act_priority = MASKED;
+ xive_vm_esb_load(&state->ipi_data, XIVE_ESB_SET_PQ_01);
+ xive_native_configure_irq(state->ipi_number, 0, MASKED, 0);
+
+ /* Increment the number of valid sources and mark this one valid */
+ if (!state->valid)
+ xive->src_count++;
+ state->valid = true;
+
+ arch_spin_unlock(&sb->lock);
+
+ return 0;
+}
+
static int kvmppc_xive_native_set_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
+ struct kvmppc_xive *xive = dev->private;
+
switch (attr->group) {
case KVM_DEV_XIVE_GRP_CTRL:
break;
+ case KVM_DEV_XIVE_GRP_SOURCE:
+ return kvmppc_xive_native_set_source(xive, attr->attr,
+ attr->addr);
}
return -ENXIO;
}
@@ -175,6 +275,11 @@ static int kvmppc_xive_native_has_attr(struct kvm_device
*dev,
switch (attr->group) {
case KVM_DEV_XIVE_GRP_CTRL:
break;
+ case KVM_DEV_XIVE_GRP_SOURCE:
+ if (attr->attr >= KVMPPC_XIVE_FIRST_IRQ &&
+ attr->attr < KVMPPC_XIVE_NR_IRQS)
+ return 0;
+ break;
}
return -ENXIO;
}
@@ -183,6 +288,7 @@ static void kvmppc_xive_native_free(struct kvm_device *dev)
{
struct kvmppc_xive *xive = dev->private;
struct kvm *kvm = xive->kvm;
+ int i;
debugfs_remove(xive->dentry);
@@ -191,6 +297,14 @@ static void kvmppc_xive_native_free(struct kvm_device *dev)
if (kvm)
kvm->arch.xive = NULL;
+ /* Mask and free interrupts */
+ for (i = 0; i <= xive->max_sbid; i++) {
+ if (xive->src_blocks[i])
+ kvmppc_xive_free_sources(xive->src_blocks[i]);
+ kfree(xive->src_blocks[i]);
+ xive->src_blocks[i] = NULL;
+ }
+
if (xive->vp_base != XIVE_INVALID_VP)
xive_native_free_vp_block(xive->vp_base);
diff --git a/Documentation/virtual/kvm/devices/xive.txt
b/Documentation/virtual/kvm/devices/xive.txt
index fdbd2ff92a88..cd8bfc37b72e 100644
--- a/Documentation/virtual/kvm/devices/xive.txt
+++ b/Documentation/virtual/kvm/devices/xive.txt
@@ -17,3 +17,18 @@ the legacy interrupt mode, referred as XICS (POWER7/8).
1. KVM_DEV_XIVE_GRP_CTRL
Provides global controls on the device
+
+ 2. KVM_DEV_XIVE_GRP_SOURCE (write only)
+ Initializes a new source in the XIVE device and mask it.
+ Attributes:
+ Interrupt source number (64-bit)
+ The kvm_device_attr.addr points to a __u64 value:
+ bits: | 63 .... 2 | 1 | 0
+ values: | unused | level | type
+ - type: 0:MSI 1:LSI
+ - level: assertion level in case of an LSI.
+ Errors:
+ -E2BIG: Interrupt source number is out of range
+ -ENOMEM: Could not create a new source block
+ -EFAULT: Invalid user pointer for attr->addr.
+ -ENXIO: Could not allocate underlying HW interrupt
--
2.20.1
