This is the basic framework for the new KVM device supporting the XIVE
native exploitation mode. The user interface exposes a new capability
and a new KVM device to be used by QEMU.
Internally, the interface to the new KVM device is protected with a
new interrupt mode: KVMPPC_IRQ_XIVE.
Signed-off-by: Cédric Le Goater <c...@kaod.org>
---
arch/powerpc/include/asm/kvm_host.h | 2 +
arch/powerpc/include/asm/kvm_ppc.h | 21 ++
arch/powerpc/kvm/book3s_xive.h | 3 +
include/uapi/linux/kvm.h | 3 +
arch/powerpc/kvm/book3s.c | 7 +-
arch/powerpc/kvm/book3s_xive_native.c | 332 ++++++++++++++++++++++++++
arch/powerpc/kvm/powerpc.c | 30 +++
arch/powerpc/kvm/Makefile | 2 +-
8 files changed, 398 insertions(+), 2 deletions(-)
create mode 100644 arch/powerpc/kvm/book3s_xive_native.c
diff --git a/arch/powerpc/include/asm/kvm_host.h
b/arch/powerpc/include/asm/kvm_host.h
index 0f98f00da2ea..c522e8274ad9 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -220,6 +220,7 @@ extern struct kvm_device_ops kvm_xics_ops;
struct kvmppc_xive;
struct kvmppc_xive_vcpu;
extern struct kvm_device_ops kvm_xive_ops;
+extern struct kvm_device_ops kvm_xive_native_ops;
struct kvmppc_passthru_irqmap;
@@ -446,6 +447,7 @@ struct kvmppc_passthru_irqmap {
#define KVMPPC_IRQ_DEFAULT 0
#define KVMPPC_IRQ_MPIC 1
#define KVMPPC_IRQ_XICS 2 /* Includes a XIVE option */
+#define KVMPPC_IRQ_XIVE 3 /* XIVE native exploitation mode */
#define MMIO_HPTE_CACHE_SIZE 4
diff --git a/arch/powerpc/include/asm/kvm_ppc.h
b/arch/powerpc/include/asm/kvm_ppc.h
index eb0d79f0ca45..1bb313f238fe 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -591,6 +591,18 @@ extern int kvmppc_xive_set_icp(struct kvm_vcpu *vcpu, u64
icpval);
extern int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 irq,
int level, bool line_status);
extern void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu);
+
+static inline int kvmppc_xive_enabled(struct kvm_vcpu *vcpu)
+{
+ return vcpu->arch.irq_type == KVMPPC_IRQ_XIVE;
+}
+
+extern int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev,
+ struct kvm_vcpu *vcpu, u32 cpu);
+extern void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu);
+extern void kvmppc_xive_native_init_module(void);
+extern void kvmppc_xive_native_exit_module(void);
+
#else
static inline int kvmppc_xive_set_xive(struct kvm *kvm, u32 irq, u32 server,
u32 priority) { return -1; }
@@ -614,6 +626,15 @@ static inline int kvmppc_xive_set_icp(struct kvm_vcpu
*vcpu, u64 icpval) { retur
static inline int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32
irq,
int level, bool line_status) { return
-ENODEV; }
static inline void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu) { }
+
+static inline int kvmppc_xive_enabled(struct kvm_vcpu *vcpu)
+ { return 0; }
+static inline int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev,
+ struct kvm_vcpu *vcpu, u32
cpu) { return -EBUSY; }
+static inline void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu) { }
+static inline void kvmppc_xive_native_init_module(void) { }
+static inline void kvmppc_xive_native_exit_module(void) { }
+
#endif /* CONFIG_KVM_XIVE */
/*
diff --git a/arch/powerpc/kvm/book3s_xive.h b/arch/powerpc/kvm/book3s_xive.h
index 10c4aa5cd010..5f22415520b4 100644
--- a/arch/powerpc/kvm/book3s_xive.h
+++ b/arch/powerpc/kvm/book3s_xive.h
@@ -12,6 +12,9 @@
#ifdef CONFIG_KVM_XICS
#include "book3s_xics.h"
+#define KVMPPC_XIVE_FIRST_IRQ 0
+#define KVMPPC_XIVE_NR_IRQS KVMPPC_XICS_NR_IRQS
+
/*
* State for one guest irq source.
*
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index 6d4ea4b6c922..52bf74a1616e 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -988,6 +988,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_ARM_VM_IPA_SIZE 165
#define KVM_CAP_MANUAL_DIRTY_LOG_PROTECT 166
#define KVM_CAP_HYPERV_CPUID 167
+#define KVM_CAP_PPC_IRQ_XIVE 168
#ifdef KVM_CAP_IRQ_ROUTING
@@ -1211,6 +1212,8 @@ enum kvm_device_type {
#define KVM_DEV_TYPE_ARM_VGIC_V3 KVM_DEV_TYPE_ARM_VGIC_V3
KVM_DEV_TYPE_ARM_VGIC_ITS,
#define KVM_DEV_TYPE_ARM_VGIC_ITS KVM_DEV_TYPE_ARM_VGIC_ITS
+ KVM_DEV_TYPE_XIVE,
+#define KVM_DEV_TYPE_XIVE KVM_DEV_TYPE_XIVE
KVM_DEV_TYPE_MAX,
};
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index bd1a677dd9e4..de7eed191107 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -1039,7 +1039,10 @@ static int kvmppc_book3s_init(void)
#ifdef CONFIG_KVM_XIVE
if (xive_enabled()) {
kvmppc_xive_init_module();
+ kvmppc_xive_native_init_module();
kvm_register_device_ops(&kvm_xive_ops, KVM_DEV_TYPE_XICS);
+ kvm_register_device_ops(&kvm_xive_native_ops,
+ KVM_DEV_TYPE_XIVE);
} else
#endif
kvm_register_device_ops(&kvm_xics_ops, KVM_DEV_TYPE_XICS);
@@ -1050,8 +1053,10 @@ static int kvmppc_book3s_init(void)
static void kvmppc_book3s_exit(void)
{
#ifdef CONFIG_KVM_XICS
- if (xive_enabled())
+ if (xive_enabled()) {
kvmppc_xive_exit_module();
+ kvmppc_xive_native_exit_module();
+ }
#endif
#ifdef CONFIG_KVM_BOOK3S_32_HANDLER
kvmppc_book3s_exit_pr();
diff --git a/arch/powerpc/kvm/book3s_xive_native.c
b/arch/powerpc/kvm/book3s_xive_native.c
new file mode 100644
index 000000000000..115143e76c45
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_xive_native.c
@@ -0,0 +1,332 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2017-2019, IBM Corporation.
+ */
+
+#define pr_fmt(fmt) "xive-kvm: " fmt
+
+#include <linux/anon_inodes.h>
+#include <linux/kernel.h>
+#include <linux/kvm_host.h>
+#include <linux/err.h>
+#include <linux/gfp.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/percpu.h>
+#include <linux/cpumask.h>
+#include <asm/uaccess.h>
+#include <asm/kvm_book3s.h>
+#include <asm/kvm_ppc.h>
+#include <asm/hvcall.h>
+#include <asm/xics.h>
+#include <asm/xive.h>
+#include <asm/xive-regs.h>
+#include <asm/debug.h>
+#include <asm/debugfs.h>
+#include <asm/time.h>
+#include <asm/opal.h>
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include "book3s_xive.h"
+
+static void xive_native_cleanup_queue(struct kvm_vcpu *vcpu, int prio)
+{
+ struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
+ struct xive_q *q = &xc->queues[prio];
+
+ xive_native_disable_queue(xc->vp_id, q, prio);
+ if (q->qpage) {
+ put_page(virt_to_page(q->qpage));
+ q->qpage = NULL;
+ }
+}
+
+void kvmppc_xive_native_cleanup_vcpu(struct kvm_vcpu *vcpu)
+{
+ struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
+ int i;
+
+ if (!kvmppc_xive_enabled(vcpu))
+ return;
+
+ if (!xc)
+ return;
+
+ pr_devel("native_cleanup_vcpu(cpu=%d)\n", xc->server_num);
+
+ /* Ensure no interrupt is still routed to that VP */
+ xc->valid = false;
+ kvmppc_xive_disable_vcpu_interrupts(vcpu);
+
+ /* Disable the VP */
+ xive_native_disable_vp(xc->vp_id);
+
+ /* Free the queues & associated interrupts */
+ for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) {
+ /* Free the escalation irq */
+ if (xc->esc_virq[i]) {
+ free_irq(xc->esc_virq[i], vcpu);
+ irq_dispose_mapping(xc->esc_virq[i]);
+ kfree(xc->esc_virq_names[i]);
+ xc->esc_virq[i] = 0;
+ }
+
+ /* Free the queue */
+ xive_native_cleanup_queue(vcpu, i);
+ }
+
+ /* Free the VP */
+ kfree(xc);
+
+ /* Cleanup the vcpu */
+ vcpu->arch.irq_type = KVMPPC_IRQ_DEFAULT;
+ vcpu->arch.xive_vcpu = NULL;
+}
+
+int kvmppc_xive_native_connect_vcpu(struct kvm_device *dev,
+ struct kvm_vcpu *vcpu, u32 cpu)
+{
+ struct kvmppc_xive *xive = dev->private;
+ struct kvmppc_xive_vcpu *xc;
+ int rc;
+
+ pr_devel("native_connect_vcpu(cpu=%d)\n", cpu);
+
+ if (dev->ops != &kvm_xive_native_ops) {
+ pr_devel("Wrong ops !\n");
+ return -EPERM;
+ }
+ if (xive->kvm != vcpu->kvm)
+ return -EPERM;
+ if (vcpu->arch.irq_type)
+ return -EBUSY;
+ if (kvmppc_xive_find_server(vcpu->kvm, cpu)) {
+ pr_devel("Duplicate !\n");
+ return -EEXIST;
+ }
+ if (cpu >= KVM_MAX_VCPUS) {
+ pr_devel("Out of bounds !\n");
+ return -EINVAL;
+ }
+ xc = kzalloc(sizeof(*xc), GFP_KERNEL);
+ if (!xc)
+ return -ENOMEM;
+
+ mutex_lock(&vcpu->kvm->lock);
+ vcpu->arch.xive_vcpu = xc;
+ xc->xive = xive;
+ xc->vcpu = vcpu;
+ xc->server_num = cpu;
+ xc->vp_id = xive->vp_base + cpu;
+ xc->valid = true;
+
+ rc = xive_native_get_vp_info(xc->vp_id, &xc->vp_cam, &xc->vp_chip_id);
+ if (rc) {
+ pr_err("Failed to get VP info from OPAL: %d\n", rc);
+ goto bail;
+ }
+
+ /*
+ * Enable the VP first as the single escalation mode will
+ * affect escalation interrupts numbering
+ */
+ rc = xive_native_enable_vp(xc->vp_id, xive->single_escalation);
+ if (rc) {
+ pr_err("Failed to enable VP in OPAL: %d\n", rc);
+ goto bail;
+ }
+
+ /* Configure VCPU fields for use by assembly push/pull */
+ vcpu->arch.xive_saved_state.w01 = cpu_to_be64(0xff000000);
+ vcpu->arch.xive_cam_word = cpu_to_be32(xc->vp_cam | TM_QW1W2_VO);
+
+ /* TODO: initialize queues ? */
+
+bail:
+ vcpu->arch.irq_type = KVMPPC_IRQ_XIVE;
+ mutex_unlock(&vcpu->kvm->lock);
+ if (rc)
+ kvmppc_xive_native_cleanup_vcpu(vcpu);
+
+ return rc;
+}
+
+static int kvmppc_xive_native_set_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ return -ENXIO;
+}
+
+static int kvmppc_xive_native_get_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ return -ENXIO;
+}
+
+static int kvmppc_xive_native_has_attr(struct kvm_device *dev,
+ struct kvm_device_attr *attr)
+{
+ return -ENXIO;
+}
+
+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);
+
+ pr_devel("Destroying xive native for partition\n");
+
+ 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);
+
+ kfree(xive);
+ kfree(dev);
+}
+
+static int kvmppc_xive_native_create(struct kvm_device *dev, u32 type)
+{
+ struct kvmppc_xive *xive;
+ struct kvm *kvm = dev->kvm;
+ int ret = 0;
+
+ pr_devel("Creating xive native for partition\n");
+
+ if (kvm->arch.xive)
+ return -EEXIST;
+
+ xive = kzalloc(sizeof(*xive), GFP_KERNEL);
+ if (!xive)
+ return -ENOMEM;
+
+ dev->private = xive;
+ xive->dev = dev;
+ xive->kvm = kvm;
+ kvm->arch.xive = xive;
+
+ /* We use the default queue size set by the host */
+ xive->q_order = xive_native_default_eq_shift();
+ if (xive->q_order < PAGE_SHIFT)
+ xive->q_page_order = 0;
+ else
+ xive->q_page_order = xive->q_order - PAGE_SHIFT;
+
+ /* Allocate a bunch of VPs */
+ xive->vp_base = xive_native_alloc_vp_block(KVM_MAX_VCPUS);
+ pr_devel("VP_Base=%x\n", xive->vp_base);
+
+ if (xive->vp_base == XIVE_INVALID_VP)
+ ret = -ENOMEM;
+
+ xive->single_escalation = xive_native_has_single_escalation();
+
+ if (ret)
+ kfree(xive);
+
+ return ret;
+}
+
+static int xive_native_debug_show(struct seq_file *m, void *private)
+{
+ struct kvmppc_xive *xive = m->private;
+ struct kvm *kvm = xive->kvm;
+ struct kvm_vcpu *vcpu;
+ unsigned int i;
+
+ if (!kvm)
+ return 0;
+
+ seq_puts(m, "=========\nVCPU state\n=========\n");
+
+ kvm_for_each_vcpu(i, vcpu, kvm) {
+ struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
+
+ if (!xc)
+ continue;
+
+ seq_printf(m, "cpu server %#x NSR=%02x CPPR=%02x IBP=%02x
PIPR=%02x w01=%016llx w2=%08x\n",
+ xc->server_num,
+ vcpu->arch.xive_saved_state.nsr,
+ vcpu->arch.xive_saved_state.cppr,
+ vcpu->arch.xive_saved_state.ipb,
+ vcpu->arch.xive_saved_state.pipr,
+ vcpu->arch.xive_saved_state.w01,
+ (u32) vcpu->arch.xive_cam_word);
+
+ kvmppc_xive_debug_show_queues(m, vcpu);
+ }
+
+ return 0;
+}
+
+static int xive_native_debug_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, xive_native_debug_show, inode->i_private);
+}
+
+static const struct file_operations xive_native_debug_fops = {
+ .open = xive_native_debug_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void xive_native_debugfs_init(struct kvmppc_xive *xive)
+{
+ char *name;
+
+ name = kasprintf(GFP_KERNEL, "kvm-xive-%p", xive);
+ if (!name) {
+ pr_err("%s: no memory for name\n", __func__);
+ return;
+ }
+
+ xive->dentry = debugfs_create_file(name, 0444, powerpc_debugfs_root,
+ xive, &xive_native_debug_fops);
+
+ pr_debug("%s: created %s\n", __func__, name);
+ kfree(name);
+}
+
+static void kvmppc_xive_native_init(struct kvm_device *dev)
+{
+ struct kvmppc_xive *xive = (struct kvmppc_xive *)dev->private;
+
+ /* Register some debug interfaces */
+ xive_native_debugfs_init(xive);
+}
+
+struct kvm_device_ops kvm_xive_native_ops = {
+ .name = "kvm-xive-native",
+ .create = kvmppc_xive_native_create,
+ .init = kvmppc_xive_native_init,
+ .destroy = kvmppc_xive_native_free,
+ .set_attr = kvmppc_xive_native_set_attr,
+ .get_attr = kvmppc_xive_native_get_attr,
+ .has_attr = kvmppc_xive_native_has_attr,
+};
+
+void kvmppc_xive_native_init_module(void)
+{
+ ;
+}
+
+void kvmppc_xive_native_exit_module(void)
+{
+ ;
+}
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index b90a7d154180..01d526e15e9d 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -566,6 +566,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
case KVM_CAP_PPC_ENABLE_HCALL:
#ifdef CONFIG_KVM_XICS
case KVM_CAP_IRQ_XICS:
+#endif
+#ifdef CONFIG_KVM_XIVE
+ case KVM_CAP_PPC_IRQ_XIVE:
#endif
case KVM_CAP_PPC_GET_CPU_CHAR:
r = 1;
@@ -753,6 +756,9 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
else
kvmppc_xics_free_icp(vcpu);
break;
+ case KVMPPC_IRQ_XIVE:
+ kvmppc_xive_native_cleanup_vcpu(vcpu);
+ break;
}
kvmppc_core_vcpu_free(vcpu);
@@ -1941,6 +1947,30 @@ static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu
*vcpu,
break;
}
#endif /* CONFIG_KVM_XICS */
+#ifdef CONFIG_KVM_XIVE
+ case KVM_CAP_PPC_IRQ_XIVE: {
+ struct fd f;
+ struct kvm_device *dev;
+
+ r = -EBADF;
+ f = fdget(cap->args[0]);
+ if (!f.file)
+ break;
+
+ r = -ENXIO;
+ if (!xive_enabled())
+ break;
+
+ r = -EPERM;
+ dev = kvm_device_from_filp(f.file);
+ if (dev)
+ r = kvmppc_xive_native_connect_vcpu(dev, vcpu,
+ cap->args[1]);
+
+ fdput(f);
+ break;
+ }
+#endif /* CONFIG_KVM_XIVE */
#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
case KVM_CAP_PPC_FWNMI:
r = -EINVAL;
diff --git a/arch/powerpc/kvm/Makefile b/arch/powerpc/kvm/Makefile
index 64f1135e7732..806cbe488410 100644
--- a/arch/powerpc/kvm/Makefile
+++ b/arch/powerpc/kvm/Makefile
@@ -99,7 +99,7 @@ endif
kvm-book3s_64-objs-$(CONFIG_KVM_XICS) += \
book3s_xics.o
-kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o
+kvm-book3s_64-objs-$(CONFIG_KVM_XIVE) += book3s_xive.o book3s_xive_native.o
kvm-book3s_64-objs-$(CONFIG_SPAPR_TCE_IOMMU) += book3s_64_vio.o
kvm-book3s_64-module-objs := \
--
2.20.1
