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-rw-r--r--arch/powerpc/include/asm/kvm_book3s_64.h2
-rw-r--r--arch/powerpc/include/asm/kvm_host.h2
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu_hv.c136
-rw-r--r--arch/powerpc/kvm/book3s_hv.c12
-rw-r--r--virt/kvm/kvm_main.c1
5 files changed, 153 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h
index 0789a0f50969..869c53fe02cd 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -436,6 +436,8 @@ static inline struct kvm_memslots *kvm_memslots_raw(struct kvm *kvm)
return rcu_dereference_raw_notrace(kvm->memslots);
}
+extern void kvmppc_mmu_debugfs_init(struct kvm *kvm);
+
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
#endif /* __ASM_KVM_BOOK3S_64_H__ */
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 015773f5bb33..f1d0bbc0f079 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -238,6 +238,8 @@ struct kvm_arch {
atomic_t hpte_mod_interest;
cpumask_t need_tlb_flush;
int hpt_cma_alloc;
+ struct dentry *debugfs_dir;
+ struct dentry *htab_dentry;
#endif /* CONFIG_KVM_BOOK3S_HV_POSSIBLE */
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
struct mutex hpt_mutex;
diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index 6c6825a7ae49..d6fe30835c58 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -27,6 +27,7 @@
#include <linux/srcu.h>
#include <linux/anon_inodes.h>
#include <linux/file.h>
+#include <linux/debugfs.h>
#include <asm/tlbflush.h>
#include <asm/kvm_ppc.h>
@@ -1490,6 +1491,141 @@ int kvm_vm_ioctl_get_htab_fd(struct kvm *kvm, struct kvm_get_htab_fd *ghf)
return ret;
}
+struct debugfs_htab_state {
+ struct kvm *kvm;
+ struct mutex mutex;
+ unsigned long hpt_index;
+ int chars_left;
+ int buf_index;
+ char buf[64];
+};
+
+static int debugfs_htab_open(struct inode *inode, struct file *file)
+{
+ struct kvm *kvm = inode->i_private;
+ struct debugfs_htab_state *p;
+
+ p = kzalloc(sizeof(*p), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ kvm_get_kvm(kvm);
+ p->kvm = kvm;
+ mutex_init(&p->mutex);
+ file->private_data = p;
+
+ return nonseekable_open(inode, file);
+}
+
+static int debugfs_htab_release(struct inode *inode, struct file *file)
+{
+ struct debugfs_htab_state *p = file->private_data;
+
+ kvm_put_kvm(p->kvm);
+ kfree(p);
+ return 0;
+}
+
+static ssize_t debugfs_htab_read(struct file *file, char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ struct debugfs_htab_state *p = file->private_data;
+ ssize_t ret, r;
+ unsigned long i, n;
+ unsigned long v, hr, gr;
+ struct kvm *kvm;
+ __be64 *hptp;
+
+ ret = mutex_lock_interruptible(&p->mutex);
+ if (ret)
+ return ret;
+
+ if (p->chars_left) {
+ n = p->chars_left;
+ if (n > len)
+ n = len;
+ r = copy_to_user(buf, p->buf + p->buf_index, n);
+ n -= r;
+ p->chars_left -= n;
+ p->buf_index += n;
+ buf += n;
+ len -= n;
+ ret = n;
+ if (r) {
+ if (!n)
+ ret = -EFAULT;
+ goto out;
+ }
+ }
+
+ kvm = p->kvm;
+ i = p->hpt_index;
+ hptp = (__be64 *)(kvm->arch.hpt_virt + (i * HPTE_SIZE));
+ for (; len != 0 && i < kvm->arch.hpt_npte; ++i, hptp += 2) {
+ if (!(be64_to_cpu(hptp[0]) & (HPTE_V_VALID | HPTE_V_ABSENT)))
+ continue;
+
+ /* lock the HPTE so it's stable and read it */
+ preempt_disable();
+ while (!try_lock_hpte(hptp, HPTE_V_HVLOCK))
+ cpu_relax();
+ v = be64_to_cpu(hptp[0]) & ~HPTE_V_HVLOCK;
+ hr = be64_to_cpu(hptp[1]);
+ gr = kvm->arch.revmap[i].guest_rpte;
+ unlock_hpte(hptp, v);
+ preempt_enable();
+
+ if (!(v & (HPTE_V_VALID | HPTE_V_ABSENT)))
+ continue;
+
+ n = scnprintf(p->buf, sizeof(p->buf),
+ "%6lx %.16lx %.16lx %.16lx\n",
+ i, v, hr, gr);
+ p->chars_left = n;
+ if (n > len)
+ n = len;
+ r = copy_to_user(buf, p->buf, n);
+ n -= r;
+ p->chars_left -= n;
+ p->buf_index = n;
+ buf += n;
+ len -= n;
+ ret += n;
+ if (r) {
+ if (!ret)
+ ret = -EFAULT;
+ goto out;
+ }
+ }
+ p->hpt_index = i;
+
+ out:
+ mutex_unlock(&p->mutex);
+ return ret;
+}
+
+ssize_t debugfs_htab_write(struct file *file, const char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ return -EACCES;
+}
+
+static const struct file_operations debugfs_htab_fops = {
+ .owner = THIS_MODULE,
+ .open = debugfs_htab_open,
+ .release = debugfs_htab_release,
+ .read = debugfs_htab_read,
+ .write = debugfs_htab_write,
+ .llseek = generic_file_llseek,
+};
+
+void kvmppc_mmu_debugfs_init(struct kvm *kvm)
+{
+ kvm->arch.htab_dentry = debugfs_create_file("htab", 0400,
+ kvm->arch.debugfs_dir, kvm,
+ &debugfs_htab_fops);
+}
+
void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
{
struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index dde14fd64d8e..08f8617f4046 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -32,6 +32,7 @@
#include <linux/page-flags.h>
#include <linux/srcu.h>
#include <linux/miscdevice.h>
+#include <linux/debugfs.h>
#include <asm/reg.h>
#include <asm/cputable.h>
@@ -2319,6 +2320,7 @@ static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
static int kvmppc_core_init_vm_hv(struct kvm *kvm)
{
unsigned long lpcr, lpid;
+ char buf[32];
/* Allocate the guest's logical partition ID */
@@ -2359,6 +2361,14 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm)
*/
kvm_hv_vm_activated();
+ /*
+ * Create a debugfs directory for the VM
+ */
+ snprintf(buf, sizeof(buf), "vm%d", current->pid);
+ kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir);
+ if (!IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
+ kvmppc_mmu_debugfs_init(kvm);
+
return 0;
}
@@ -2379,6 +2389,8 @@ static void kvmppc_free_vcores(struct kvm *kvm)
static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
{
+ debugfs_remove_recursive(kvm->arch.debugfs_dir);
+
kvm_hv_vm_deactivated();
kvmppc_free_vcores(kvm);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index d3fc9399062a..90977418aeb6 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -89,6 +89,7 @@ EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
static __read_mostly struct preempt_ops kvm_preempt_ops;
struct dentry *kvm_debugfs_dir;
+EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
unsigned long arg);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-13 23:55:58 +0000