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linux/arch/powerpc/kvm/book3s_xive_native.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2017-2019, IBM Corporation.
*/
#define pr_fmt(fmt) "xive-kvm: " fmt
#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/file.h>
#include <asm/uaccess.h>
#include <asm/kvm_book3s.h>
#include <asm/kvm_ppc.h>
#include <asm/hvcall.h>
#include <asm/xive.h>
#include <asm/xive-regs.h>
#include <asm/debug.h>
#include <asm/debugfs.h>
#include <asm/opal.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include "book3s_xive.h"
static u8 xive_vm_esb_load(struct xive_irq_data *xd, u32 offset)
{
u64 val;
/*
* The KVM XIVE native device does not use the XIVE_ESB_SET_PQ_10
* load operation, so there is no need to enforce load-after-store
* ordering.
*/
if (xd->flags & XIVE_IRQ_FLAG_SHIFT_BUG)
offset |= offset << 4;
val = in_be64(xd->eoi_mmio + offset);
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;
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;
}
}
static int kvmppc_xive_native_configure_queue(u32 vp_id, struct xive_q *q,
u8 prio, __be32 *qpage,
u32 order, bool can_escalate)
{
int rc;
__be32 *qpage_prev = q->qpage;
rc = xive_native_configure_queue(vp_id, q, prio, qpage, order,
can_escalate);
if (rc)
return rc;
if (qpage_prev)
put_page(virt_to_page(qpage_prev));
return rc;
}
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);
/* Free escalations */
for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) {
/* Free the escalation irq */
if (xc->esc_virq[i]) {
if (xc->xive->single_escalation)
xive_cleanup_single_escalation(vcpu, xc,
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;
}
}
/* Disable the VP */
xive_native_disable_vp(xc->vp_id);
/* Clear the cam word so guest entry won't try to push context */
vcpu->arch.xive_cam_word = 0;
/* Free the queues */
for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) {
kvmppc_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 server_num)
{
struct kvmppc_xive *xive = dev->private;
struct kvmppc_xive_vcpu *xc = NULL;
int rc;
u32 vp_id;
pr_devel("native_connect_vcpu(server=%d)\n", server_num);
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 != KVMPPC_IRQ_DEFAULT)
return -EBUSY;
mutex_lock(&xive->lock);
rc = kvmppc_xive_compute_vp_id(xive, server_num, &vp_id);
if (rc)
goto bail;
xc = kzalloc(sizeof(*xc), GFP_KERNEL);
if (!xc) {
rc = -ENOMEM;
goto bail;
}
vcpu->arch.xive_vcpu = xc;
xc->xive = xive;
xc->vcpu = vcpu;
xc->server_num = server_num;
xc->vp_id = vp_id;
xc->valid = true;
vcpu->arch.irq_type = KVMPPC_IRQ_XIVE;
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: reset all queues to a clean state ? */
bail:
mutex_unlock(&xive->lock);
if (rc)
kvmppc_xive_native_cleanup_vcpu(vcpu);
return rc;
}
/*
* Device passthrough support
*/
static int kvmppc_xive_native_reset_mapped(struct kvm *kvm, unsigned long irq)
{
struct kvmppc_xive *xive = kvm->arch.xive;
pgoff_t esb_pgoff = KVM_XIVE_ESB_PAGE_OFFSET + irq * 2;
if (irq >= KVMPPC_XIVE_NR_IRQS)
return -EINVAL;
/*
* Clear the ESB pages of the IRQ number being mapped (or
* unmapped) into the guest and let the the VM fault handler
* repopulate with the appropriate ESB pages (device or IC)
*/
pr_debug("clearing esb pages for girq 0x%lx\n", irq);
mutex_lock(&xive->mapping_lock);
if (xive->mapping)
unmap_mapping_range(xive->mapping,
esb_pgoff << PAGE_SHIFT,
2ull << PAGE_SHIFT, 1);
mutex_unlock(&xive->mapping_lock);
return 0;
}
static struct kvmppc_xive_ops kvmppc_xive_native_ops = {
.reset_mapped = kvmppc_xive_native_reset_mapped,
};
static vm_fault_t xive_native_esb_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
struct kvm_device *dev = vma->vm_file->private_data;
struct kvmppc_xive *xive = dev->private;
struct kvmppc_xive_src_block *sb;
struct kvmppc_xive_irq_state *state;
struct xive_irq_data *xd;
u32 hw_num;
u16 src;
u64 page;
unsigned long irq;
u64 page_offset;
/*
* Linux/KVM uses a two pages ESB setting, one for trigger and
* one for EOI
*/
page_offset = vmf->pgoff - vma->vm_pgoff;
irq = page_offset / 2;
sb = kvmppc_xive_find_source(xive, irq, &src);
if (!sb) {
pr_devel("%s: source %lx not found !\n", __func__, irq);
return VM_FAULT_SIGBUS;
}
state = &sb->irq_state[src];
/* Some sanity checking */
if (!state->valid) {
pr_devel("%s: source %lx invalid !\n", __func__, irq);
return VM_FAULT_SIGBUS;
}
kvmppc_xive_select_irq(state, &hw_num, &xd);
arch_spin_lock(&sb->lock);
/*
* first/even page is for trigger
* second/odd page is for EOI and management.
*/
page = page_offset % 2 ? xd->eoi_page : xd->trig_page;
arch_spin_unlock(&sb->lock);
if (WARN_ON(!page)) {
pr_err("%s: accessing invalid ESB page for source %lx !\n",
__func__, irq);
return VM_FAULT_SIGBUS;
}
vmf_insert_pfn(vma, vmf->address, page >> PAGE_SHIFT);
return VM_FAULT_NOPAGE;
}
static const struct vm_operations_struct xive_native_esb_vmops = {
.fault = xive_native_esb_fault,
};
static vm_fault_t xive_native_tima_fault(struct vm_fault *vmf)
{
struct vm_area_struct *vma = vmf->vma;
switch (vmf->pgoff - vma->vm_pgoff) {
case 0: /* HW - forbid access */
case 1: /* HV - forbid access */
return VM_FAULT_SIGBUS;
case 2: /* OS */
vmf_insert_pfn(vma, vmf->address, xive_tima_os >> PAGE_SHIFT);
return VM_FAULT_NOPAGE;
case 3: /* USER - TODO */
default:
return VM_FAULT_SIGBUS;
}
}
static const struct vm_operations_struct xive_native_tima_vmops = {
.fault = xive_native_tima_fault,
};
static int kvmppc_xive_native_mmap(struct kvm_device *dev,
struct vm_area_struct *vma)
{
struct kvmppc_xive *xive = dev->private;
/* We only allow mappings at fixed offset for now */
if (vma->vm_pgoff == KVM_XIVE_TIMA_PAGE_OFFSET) {
if (vma_pages(vma) > 4)
return -EINVAL;
vma->vm_ops = &xive_native_tima_vmops;
} else if (vma->vm_pgoff == KVM_XIVE_ESB_PAGE_OFFSET) {
if (vma_pages(vma) > KVMPPC_XIVE_NR_IRQS * 2)
return -EINVAL;
vma->vm_ops = &xive_native_esb_vmops;
} else {
return -EINVAL;
}
vma->vm_flags |= VM_IO | VM_PFNMAP;
vma->vm_page_prot = pgprot_noncached_wc(vma->vm_page_prot);
/*
* Grab the KVM device file address_space to be able to clear
* the ESB pages mapping when a device is passed-through into
* the guest.
*/
xive->mapping = vma->vm_file->f_mapping;
return 0;
}
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;
int rc;
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;
}
arch_spin_lock(&sb->lock);
/*
* 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");
rc = -ENXIO;
goto unlock;
}
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);
}
/* 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;
rc = 0;
unlock:
arch_spin_unlock(&sb->lock);
return rc;
}
static int kvmppc_xive_native_update_source_config(struct kvmppc_xive *xive,
struct kvmppc_xive_src_block *sb,
struct kvmppc_xive_irq_state *state,
u32 server, u8 priority, bool masked,
u32 eisn)
{
struct kvm *kvm = xive->kvm;
u32 hw_num;
int rc = 0;
arch_spin_lock(&sb->lock);
if (state->act_server == server && state->act_priority == priority &&
state->eisn == eisn)
goto unlock;
pr_devel("new_act_prio=%d new_act_server=%d mask=%d act_server=%d act_prio=%d\n",
priority, server, masked, state->act_server,
state->act_priority);
kvmppc_xive_select_irq(state, &hw_num, NULL);
if (priority != MASKED && !masked) {
rc = kvmppc_xive_select_target(kvm, &server, priority);
if (rc)
goto unlock;
state->act_priority = priority;
state->act_server = server;
state->eisn = eisn;
rc = xive_native_configure_irq(hw_num,
kvmppc_xive_vp(xive, server),
priority, eisn);
} else {
state->act_priority = MASKED;
state->act_server = 0;
state->eisn = 0;
rc = xive_native_configure_irq(hw_num, 0, MASKED, 0);
}
unlock:
arch_spin_unlock(&sb->lock);
return rc;
}
static int kvmppc_xive_native_set_source_config(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;
u16 src;
u64 kvm_cfg;
u32 server;
u8 priority;
bool masked;
u32 eisn;
sb = kvmppc_xive_find_source(xive, irq, &src);
if (!sb)
return -ENOENT;
state = &sb->irq_state[src];
if (!state->valid)
return -EINVAL;
if (get_user(kvm_cfg, ubufp))
return -EFAULT;
pr_devel("%s irq=0x%lx cfg=%016llx\n", __func__, irq, kvm_cfg);
priority = (kvm_cfg & KVM_XIVE_SOURCE_PRIORITY_MASK) >>
KVM_XIVE_SOURCE_PRIORITY_SHIFT;
server = (kvm_cfg & KVM_XIVE_SOURCE_SERVER_MASK) >>
KVM_XIVE_SOURCE_SERVER_SHIFT;
masked = (kvm_cfg & KVM_XIVE_SOURCE_MASKED_MASK) >>
KVM_XIVE_SOURCE_MASKED_SHIFT;
eisn = (kvm_cfg & KVM_XIVE_SOURCE_EISN_MASK) >>
KVM_XIVE_SOURCE_EISN_SHIFT;
if (priority != xive_prio_from_guest(priority)) {
pr_err("invalid priority for queue %d for VCPU %d\n",
priority, server);
return -EINVAL;
}
return kvmppc_xive_native_update_source_config(xive, sb, state, server,
priority, masked, eisn);
}
static int kvmppc_xive_native_sync_source(struct kvmppc_xive *xive,
long irq, u64 addr)
{
struct kvmppc_xive_src_block *sb;
struct kvmppc_xive_irq_state *state;
struct xive_irq_data *xd;
u32 hw_num;
u16 src;
int rc = 0;
pr_devel("%s irq=0x%lx", __func__, irq);
sb = kvmppc_xive_find_source(xive, irq, &src);
if (!sb)
return -ENOENT;
state = &sb->irq_state[src];
rc = -EINVAL;
arch_spin_lock(&sb->lock);
if (state->valid) {
kvmppc_xive_select_irq(state, &hw_num, &xd);
xive_native_sync_source(hw_num);
rc = 0;
}
arch_spin_unlock(&sb->lock);
return rc;
}
static int xive_native_validate_queue_size(u32 qshift)
{
/*
* We only support 64K pages for the moment. This is also
* advertised in the DT property "ibm,xive-eq-sizes"
*/
switch (qshift) {
case 0: /* EQ reset */
case 16:
return 0;
case 12:
case 21:
case 24:
default:
return -EINVAL;
}
}
static int kvmppc_xive_native_set_queue_config(struct kvmppc_xive *xive,
long eq_idx, u64 addr)
{
struct kvm *kvm = xive->kvm;
struct kvm_vcpu *vcpu;
struct kvmppc_xive_vcpu *xc;
void __user *ubufp = (void __user *) addr;
u32 server;
u8 priority;
struct kvm_ppc_xive_eq kvm_eq;
int rc;
__be32 *qaddr = 0;
struct page *page;
struct xive_q *q;
gfn_t gfn;
unsigned long page_size;
int srcu_idx;
/*
* Demangle priority/server tuple from the EQ identifier
*/
priority = (eq_idx & KVM_XIVE_EQ_PRIORITY_MASK) >>
KVM_XIVE_EQ_PRIORITY_SHIFT;
server = (eq_idx & KVM_XIVE_EQ_SERVER_MASK) >>
KVM_XIVE_EQ_SERVER_SHIFT;
if (copy_from_user(&kvm_eq, ubufp, sizeof(kvm_eq)))
return -EFAULT;
vcpu = kvmppc_xive_find_server(kvm, server);
if (!vcpu) {
pr_err("Can't find server %d\n", server);
return -ENOENT;
}
xc = vcpu->arch.xive_vcpu;
if (priority != xive_prio_from_guest(priority)) {
pr_err("Trying to restore invalid queue %d for VCPU %d\n",
priority, server);
return -EINVAL;
}
q = &xc->queues[priority];
pr_devel("%s VCPU %d priority %d fl:%x shift:%d addr:%llx g:%d idx:%d\n",
__func__, server, priority, kvm_eq.flags,
kvm_eq.qshift, kvm_eq.qaddr, kvm_eq.qtoggle, kvm_eq.qindex);
/* reset queue and disable queueing */
if (!kvm_eq.qshift) {
q->guest_qaddr = 0;
q->guest_qshift = 0;
rc = kvmppc_xive_native_configure_queue(xc->vp_id, q, priority,
NULL, 0, true);
if (rc) {
pr_err("Failed to reset queue %d for VCPU %d: %d\n",
priority, xc->server_num, rc);
return rc;
}
return 0;
}
/*
* sPAPR specifies a "Unconditional Notify (n) flag" for the
* H_INT_SET_QUEUE_CONFIG hcall which forces notification
* without using the coalescing mechanisms provided by the
* XIVE END ESBs. This is required on KVM as notification
* using the END ESBs is not supported.
*/
if (kvm_eq.flags != KVM_XIVE_EQ_ALWAYS_NOTIFY) {
pr_err("invalid flags %d\n", kvm_eq.flags);
return -EINVAL;
}
rc = xive_native_validate_queue_size(kvm_eq.qshift);
if (rc) {
pr_err("invalid queue size %d\n", kvm_eq.qshift);
return rc;
}
if (kvm_eq.qaddr & ((1ull << kvm_eq.qshift) - 1)) {
pr_err("queue page is not aligned %llx/%llx\n", kvm_eq.qaddr,
1ull << kvm_eq.qshift);
return -EINVAL;
}
srcu_idx = srcu_read_lock(&kvm->srcu);
gfn = gpa_to_gfn(kvm_eq.qaddr);
page_size = kvm_host_page_size(vcpu, gfn);
if (1ull << kvm_eq.qshift > page_size) {
srcu_read_unlock(&kvm->srcu, srcu_idx);
pr_warn("Incompatible host page size %lx!\n", page_size);
return -EINVAL;
}
page = gfn_to_page(kvm, gfn);
if (is_error_page(page)) {
srcu_read_unlock(&kvm->srcu, srcu_idx);
pr_err("Couldn't get queue page %llx!\n", kvm_eq.qaddr);
return -EINVAL;
}
qaddr = page_to_virt(page) + (kvm_eq.qaddr & ~PAGE_MASK);
srcu_read_unlock(&kvm->srcu, srcu_idx);
/*
* Backup the queue page guest address to the mark EQ page
* dirty for migration.
*/
q->guest_qaddr = kvm_eq.qaddr;
q->guest_qshift = kvm_eq.qshift;
/*
* Unconditional Notification is forced by default at the
* OPAL level because the use of END ESBs is not supported by
* Linux.
*/
rc = kvmppc_xive_native_configure_queue(xc->vp_id, q, priority,
(__be32 *) qaddr, kvm_eq.qshift, true);
if (rc) {
pr_err("Failed to configure queue %d for VCPU %d: %d\n",
priority, xc->server_num, rc);
put_page(page);
return rc;
}
/*
* Only restore the queue state when needed. When doing the
* H_INT_SET_SOURCE_CONFIG hcall, it should not.
*/
if (kvm_eq.qtoggle != 1 || kvm_eq.qindex != 0) {
rc = xive_native_set_queue_state(xc->vp_id, priority,
kvm_eq.qtoggle,
kvm_eq.qindex);
if (rc)
goto error;
}
rc = kvmppc_xive_attach_escalation(vcpu, priority,
xive->single_escalation);
error:
if (rc)
kvmppc_xive_native_cleanup_queue(vcpu, priority);
return rc;
}
static int kvmppc_xive_native_get_queue_config(struct kvmppc_xive *xive,
long eq_idx, u64 addr)
{
struct kvm *kvm = xive->kvm;
struct kvm_vcpu *vcpu;
struct kvmppc_xive_vcpu *xc;
struct xive_q *q;
void __user *ubufp = (u64 __user *) addr;
u32 server;
u8 priority;
struct kvm_ppc_xive_eq kvm_eq;
u64 qaddr;
u64 qshift;
u64 qeoi_page;
u32 escalate_irq;
u64 qflags;
int rc;
/*
* Demangle priority/server tuple from the EQ identifier
*/
priority = (eq_idx & KVM_XIVE_EQ_PRIORITY_MASK) >>
KVM_XIVE_EQ_PRIORITY_SHIFT;
server = (eq_idx & KVM_XIVE_EQ_SERVER_MASK) >>
KVM_XIVE_EQ_SERVER_SHIFT;
vcpu = kvmppc_xive_find_server(kvm, server);
if (!vcpu) {
pr_err("Can't find server %d\n", server);
return -ENOENT;
}
xc = vcpu->arch.xive_vcpu;
if (priority != xive_prio_from_guest(priority)) {
pr_err("invalid priority for queue %d for VCPU %d\n",
priority, server);
return -EINVAL;
}
q = &xc->queues[priority];
memset(&kvm_eq, 0, sizeof(kvm_eq));
if (!q->qpage)
return 0;
rc = xive_native_get_queue_info(xc->vp_id, priority, &qaddr, &qshift,
&qeoi_page, &escalate_irq, &qflags);
if (rc)
return rc;
kvm_eq.flags = 0;
if (qflags & OPAL_XIVE_EQ_ALWAYS_NOTIFY)
kvm_eq.flags |= KVM_XIVE_EQ_ALWAYS_NOTIFY;
kvm_eq.qshift = q->guest_qshift;
kvm_eq.qaddr = q->guest_qaddr;
rc = xive_native_get_queue_state(xc->vp_id, priority, &kvm_eq.qtoggle,
&kvm_eq.qindex);
if (rc)
return rc;
pr_devel("%s VCPU %d priority %d fl:%x shift:%d addr:%llx g:%d idx:%d\n",
__func__, server, priority, kvm_eq.flags,
kvm_eq.qshift, kvm_eq.qaddr, kvm_eq.qtoggle, kvm_eq.qindex);
if (copy_to_user(ubufp, &kvm_eq, sizeof(kvm_eq)))
return -EFAULT;
return 0;
}
static void kvmppc_xive_reset_sources(struct kvmppc_xive_src_block *sb)
{
int i;
for (i = 0; i < KVMPPC_XICS_IRQ_PER_ICS; i++) {
struct kvmppc_xive_irq_state *state = &sb->irq_state[i];
if (!state->valid)
continue;
if (state->act_priority == MASKED)
continue;
state->eisn = 0;
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);
if (state->pt_number) {
xive_vm_esb_load(state->pt_data, XIVE_ESB_SET_PQ_01);
xive_native_configure_irq(state->pt_number,
0, MASKED, 0);
}
}
}
static int kvmppc_xive_reset(struct kvmppc_xive *xive)
{
struct kvm *kvm = xive->kvm;
struct kvm_vcpu *vcpu;
unsigned int i;
pr_devel("%s\n", __func__);
mutex_lock(&xive->lock);
kvm_for_each_vcpu(i, vcpu, kvm) {
struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
unsigned int prio;
if (!xc)
continue;
kvmppc_xive_disable_vcpu_interrupts(vcpu);
for (prio = 0; prio < KVMPPC_XIVE_Q_COUNT; prio++) {
/* Single escalation, no queue 7 */
if (prio == 7 && xive->single_escalation)
break;
if (xc->esc_virq[prio]) {
free_irq(xc->esc_virq[prio], vcpu);
irq_dispose_mapping(xc->esc_virq[prio]);
kfree(xc->esc_virq_names[prio]);
xc->esc_virq[prio] = 0;
}
kvmppc_xive_native_cleanup_queue(vcpu, prio);
}
}
for (i = 0; i <= xive->max_sbid; i++) {
struct kvmppc_xive_src_block *sb = xive->src_blocks[i];
if (sb) {
arch_spin_lock(&sb->lock);
kvmppc_xive_reset_sources(sb);
arch_spin_unlock(&sb->lock);
}
}
mutex_unlock(&xive->lock);
return 0;
}
static void kvmppc_xive_native_sync_sources(struct kvmppc_xive_src_block *sb)
{
int j;
for (j = 0; j < KVMPPC_XICS_IRQ_PER_ICS; j++) {
struct kvmppc_xive_irq_state *state = &sb->irq_state[j];
struct xive_irq_data *xd;
u32 hw_num;
if (!state->valid)
continue;
/*
* The struct kvmppc_xive_irq_state reflects the state
* of the EAS configuration and not the state of the
* source. The source is masked setting the PQ bits to
* '-Q', which is what is being done before calling
* the KVM_DEV_XIVE_EQ_SYNC control.
*
* If a source EAS is configured, OPAL syncs the XIVE
* IC of the source and the XIVE IC of the previous
* target if any.
*
* So it should be fine ignoring MASKED sources as
* they have been synced already.
*/
if (state->act_priority == MASKED)
continue;
kvmppc_xive_select_irq(state, &hw_num, &xd);
xive_native_sync_source(hw_num);
xive_native_sync_queue(hw_num);
}
}
static int kvmppc_xive_native_vcpu_eq_sync(struct kvm_vcpu *vcpu)
{
struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
unsigned int prio;
int srcu_idx;
if (!xc)
return -ENOENT;
for (prio = 0; prio < KVMPPC_XIVE_Q_COUNT; prio++) {
struct xive_q *q = &xc->queues[prio];
if (!q->qpage)
continue;
/* Mark EQ page dirty for migration */
srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
mark_page_dirty(vcpu->kvm, gpa_to_gfn(q->guest_qaddr));
srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
}
return 0;
}
static int kvmppc_xive_native_eq_sync(struct kvmppc_xive *xive)
{
struct kvm *kvm = xive->kvm;
struct kvm_vcpu *vcpu;
unsigned int i;
pr_devel("%s\n", __func__);
mutex_lock(&xive->lock);
for (i = 0; i <= xive->max_sbid; i++) {
struct kvmppc_xive_src_block *sb = xive->src_blocks[i];
if (sb) {
arch_spin_lock(&sb->lock);
kvmppc_xive_native_sync_sources(sb);
arch_spin_unlock(&sb->lock);
}
}
kvm_for_each_vcpu(i, vcpu, kvm) {
kvmppc_xive_native_vcpu_eq_sync(vcpu);
}
mutex_unlock(&xive->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:
switch (attr->attr) {
case KVM_DEV_XIVE_RESET:
return kvmppc_xive_reset(xive);
case KVM_DEV_XIVE_EQ_SYNC:
return kvmppc_xive_native_eq_sync(xive);
case KVM_DEV_XIVE_NR_SERVERS:
return kvmppc_xive_set_nr_servers(xive, attr->addr);
}
break;
case KVM_DEV_XIVE_GRP_SOURCE:
return kvmppc_xive_native_set_source(xive, attr->attr,
attr->addr);
case KVM_DEV_XIVE_GRP_SOURCE_CONFIG:
return kvmppc_xive_native_set_source_config(xive, attr->attr,
attr->addr);
case KVM_DEV_XIVE_GRP_EQ_CONFIG:
return kvmppc_xive_native_set_queue_config(xive, attr->attr,
attr->addr);
case KVM_DEV_XIVE_GRP_SOURCE_SYNC:
return kvmppc_xive_native_sync_source(xive, attr->attr,
attr->addr);
}
return -ENXIO;
}
static int kvmppc_xive_native_get_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
struct kvmppc_xive *xive = dev->private;
switch (attr->group) {
case KVM_DEV_XIVE_GRP_EQ_CONFIG:
return kvmppc_xive_native_get_queue_config(xive, attr->attr,
attr->addr);
}
return -ENXIO;
}
static int kvmppc_xive_native_has_attr(struct kvm_device *dev,
struct kvm_device_attr *attr)
{
switch (attr->group) {
case KVM_DEV_XIVE_GRP_CTRL:
switch (attr->attr) {
case KVM_DEV_XIVE_RESET:
case KVM_DEV_XIVE_EQ_SYNC:
case KVM_DEV_XIVE_NR_SERVERS:
return 0;
}
break;
case KVM_DEV_XIVE_GRP_SOURCE:
case KVM_DEV_XIVE_GRP_SOURCE_CONFIG:
case KVM_DEV_XIVE_GRP_SOURCE_SYNC:
if (attr->attr >= KVMPPC_XIVE_FIRST_IRQ &&
attr->attr < KVMPPC_XIVE_NR_IRQS)
return 0;
break;
case KVM_DEV_XIVE_GRP_EQ_CONFIG:
return 0;
}
return -ENXIO;
}
/*
* Called when device fd is closed. kvm->lock is held.
*/
static void kvmppc_xive_native_release(struct kvm_device *dev)
{
struct kvmppc_xive *xive = dev->private;
struct kvm *kvm = xive->kvm;
struct kvm_vcpu *vcpu;
int i;
pr_devel("Releasing xive native device\n");
/*
* Clear the KVM device file address_space which is used to
* unmap the ESB pages when a device is passed-through.
*/
mutex_lock(&xive->mapping_lock);
xive->mapping = NULL;
mutex_unlock(&xive->mapping_lock);
/*
* Since this is the device release function, we know that
* userspace does not have any open fd or mmap referring to
* the device. Therefore there can not be any of the
* device attribute set/get, mmap, or page fault functions
* being executed concurrently, and similarly, the
* connect_vcpu and set/clr_mapped functions also cannot
* be being executed.
*/
debugfs_remove(xive->dentry);
/*
* We should clean up the vCPU interrupt presenters first.
*/
kvm_for_each_vcpu(i, vcpu, kvm) {
/*
* Take vcpu->mutex to ensure that no one_reg get/set ioctl
* (i.e. kvmppc_xive_native_[gs]et_vp) can be being done.
* Holding the vcpu->mutex also means that the vcpu cannot
* be executing the KVM_RUN ioctl, and therefore it cannot
* be executing the XIVE push or pull code or accessing
* the XIVE MMIO regions.
*/
mutex_lock(&vcpu->mutex);
kvmppc_xive_native_cleanup_vcpu(vcpu);
mutex_unlock(&vcpu->mutex);
}
/*
* Now that we have cleared vcpu->arch.xive_vcpu, vcpu->arch.irq_type
* and vcpu->arch.xive_esc_[vr]addr on each vcpu, we are safe
* against xive code getting called during vcpu execution or
* set/get one_reg operations.
*/
kvm->arch.xive = NULL;
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);
/*
* A reference of the kvmppc_xive pointer is now kept under
* the xive_devices struct of the machine for reuse. It is
* freed when the VM is destroyed for now until we fix all the
* execution paths.
*/
kfree(dev);
}
/*
* Create a XIVE device. kvm->lock is held.
*/
static int kvmppc_xive_native_create(struct kvm_device *dev, u32 type)
{
struct kvmppc_xive *xive;
struct kvm *kvm = dev->kvm;
pr_devel("Creating xive native device\n");
if (kvm->arch.xive)
return -EEXIST;
xive = kvmppc_xive_get_device(kvm, type);
if (!xive)
return -ENOMEM;
dev->private = xive;
xive->dev = dev;
xive->kvm = kvm;
mutex_init(&xive->mapping_lock);
mutex_init(&xive->lock);
/* VP allocation is delayed to the first call to connect_vcpu */
xive->vp_base = XIVE_INVALID_VP;
/* KVM_MAX_VCPUS limits the number of VMs to roughly 64 per sockets
* on a POWER9 system.
*/
xive->nr_servers = KVM_MAX_VCPUS;
xive->single_escalation = xive_native_has_single_escalation();
xive->ops = &kvmppc_xive_native_ops;
kvm->arch.xive = xive;
return 0;
}
/*
* Interrupt Pending Buffer (IPB) offset
*/
#define TM_IPB_SHIFT 40
#define TM_IPB_MASK (((u64) 0xFF) << TM_IPB_SHIFT)
int kvmppc_xive_native_get_vp(struct kvm_vcpu *vcpu, union kvmppc_one_reg *val)
{
struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
u64 opal_state;
int rc;
if (!kvmppc_xive_enabled(vcpu))
return -EPERM;
if (!xc)
return -ENOENT;
/* Thread context registers. We only care about IPB and CPPR */
val->xive_timaval[0] = vcpu->arch.xive_saved_state.w01;
/* Get the VP state from OPAL */
rc = xive_native_get_vp_state(xc->vp_id, &opal_state);
if (rc)
return rc;
/*
* Capture the backup of IPB register in the NVT structure and
* merge it in our KVM VP state.
*/
val->xive_timaval[0] |= cpu_to_be64(opal_state & TM_IPB_MASK);
pr_devel("%s NSR=%02x CPPR=%02x IBP=%02x PIPR=%02x w01=%016llx w2=%08x opal=%016llx\n",
__func__,
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, opal_state);
return 0;
}
int kvmppc_xive_native_set_vp(struct kvm_vcpu *vcpu, union kvmppc_one_reg *val)
{
struct kvmppc_xive_vcpu *xc = vcpu->arch.xive_vcpu;
struct kvmppc_xive *xive = vcpu->kvm->arch.xive;
pr_devel("%s w01=%016llx vp=%016llx\n", __func__,
val->xive_timaval[0], val->xive_timaval[1]);
if (!kvmppc_xive_enabled(vcpu))
return -EPERM;
if (!xc || !xive)
return -ENOENT;
/* We can't update the state of a "pushed" VCPU */
if (WARN_ON(vcpu->arch.xive_pushed))
return -EBUSY;
/*
* Restore the thread context registers. IPB and CPPR should
* be the only ones that matter.
*/
vcpu->arch.xive_saved_state.w01 = val->xive_timaval[0];
/*
* There is no need to restore the XIVE internal state (IPB
* stored in the NVT) as the IPB register was merged in KVM VP
* state when captured.
*/
return 0;
}
bool kvmppc_xive_native_supported(void)
{
return xive_native_has_queue_state_support();
}
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 VP=%#x NSR=%02x CPPR=%02x IBP=%02x PIPR=%02x w01=%016llx w2=%08x\n",
xc->server_num, xc->vp_id,
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;
}
DEFINE_SHOW_ATTRIBUTE(xive_native_debug);
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,
.release = kvmppc_xive_native_release,
.set_attr = kvmppc_xive_native_set_attr,
.get_attr = kvmppc_xive_native_get_attr,
.has_attr = kvmppc_xive_native_has_attr,
.mmap = kvmppc_xive_native_mmap,
};
void kvmppc_xive_native_init_module(void)
{
;
}
void kvmppc_xive_native_exit_module(void)
{
;
}
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