This adds a list of valid shadow PTEs for each nested guest to
the 'radix' file for the guest in debugfs. This can be useful for
debugging.
Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx>
---
arch/powerpc/include/asm/kvm_book3s_64.h | 1 +
arch/powerpc/kvm/book3s_64_mmu_radix.c | 39 +++++++++++++++++++++++++++++---
arch/powerpc/kvm/book3s_hv_nested.c | 15 ++++++++++++
3 files changed, 52 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_book3s_64.h b/arch/powerpc/include/asm/kvm_book3s_64.h
index 84c4c0e..12007f6 100644
--- a/arch/powerpc/include/asm/kvm_book3s_64.h
+++ b/arch/powerpc/include/asm/kvm_book3s_64.h
@@ -50,6 +50,7 @@ struct rmap_nested {
struct kvm_nested_guest *kvmhv_get_nested(struct kvm *kvm, int lpid,
bool create);
void kvmhv_put_nested(struct kvm_nested_guest *gp);
+int kvmhv_nested_next_lpid(struct kvm *kvm, int lpid);
/* Power architecture requires HPT is at least 256kiB, at most 64TiB */
#define PPC_MIN_HPT_ORDER 18
diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index 52b2a57..41beb9b 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -978,6 +978,7 @@ struct debugfs_radix_state {
struct kvm *kvm;
struct mutex mutex;
unsigned long gpa;
+ int lpid;
int chars_left;
int buf_index;
char buf[128];
@@ -1019,6 +1020,7 @@ static ssize_t debugfs_radix_read(struct file *file, char __user *buf,
struct kvm *kvm;
unsigned long gpa;
pgd_t *pgt;
+ struct kvm_nested_guest *nested;
pgd_t pgd, *pgdp;
pud_t pud, *pudp;
pmd_t pmd, *pmdp;
@@ -1053,10 +1055,39 @@ static ssize_t debugfs_radix_read(struct file *file, char __user *buf,
}
gpa = p->gpa;
- pgt = kvm->arch.pgtable;
- while (len != 0 && gpa < RADIX_PGTABLE_RANGE) {
+ nested = NULL;
+ pgt = NULL;
+ while (len != 0 && p->lpid >= 0) {
+ if (gpa >= RADIX_PGTABLE_RANGE) {
+ gpa = 0;
+ pgt = NULL;
+ if (nested) {
+ kvmhv_put_nested(nested);
+ nested = NULL;
+ }
+ p->lpid = kvmhv_nested_next_lpid(kvm, p->lpid);
+ p->hdr = 0;
+ if (p->lpid < 0)
+ break;
+ }
+ if (!pgt) {
+ if (p->lpid == 0) {
+ pgt = kvm->arch.pgtable;
+ } else {
+ nested = kvmhv_get_nested(kvm, p->lpid, false);
+ if (!nested) {
+ gpa = RADIX_PGTABLE_RANGE;
+ continue;
+ }
+ pgt = nested->shadow_pgtable;
+ }
+ }
+ n = 0;
if (!p->hdr) {
- n = scnprintf(p->buf, sizeof(p->buf),
+ if (p->lpid > 0)
+ n = scnprintf(p->buf, sizeof(p->buf),
+ "\nNested LPID %d: ", p->lpid);
+ n += scnprintf(p->buf + n, sizeof(p->buf) - n,
"pgdir: %lx\n", (unsigned long)pgt);
p->hdr = 1;
goto copy;
@@ -1122,6 +1153,8 @@ static ssize_t debugfs_radix_read(struct file *file, char __user *buf,
}
}
p->gpa = gpa;
+ if (nested)
+ kvmhv_put_nested(nested);
out:
mutex_unlock(&p->mutex);
diff --git a/arch/powerpc/kvm/book3s_hv_nested.c b/arch/powerpc/kvm/book3s_hv_nested.c
index 0d7cd66..027cc16 100644
--- a/arch/powerpc/kvm/book3s_hv_nested.c
+++ b/arch/powerpc/kvm/book3s_hv_nested.c
@@ -1182,3 +1182,18 @@ long int kvmhv_nested_page_fault(struct kvm_vcpu *vcpu)
mutex_unlock(&gp->tlb_lock);
return ret;
}
+
+int kvmhv_nested_next_lpid(struct kvm *kvm, int lpid)
+{
+ int ret = -1;
+
+ spin_lock(&kvm->mmu_lock);
+ while (++lpid <= kvm->arch.max_nested_lpid) {
+ if (kvm->arch.nested_guests[lpid]) {
+ ret = lpid;
+ break;
+ }
+ }
+ spin_unlock(&kvm->mmu_lock);
+ return ret;
+}
--
2.7.4
