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Message-ID: <20240816123906.3683425-6-sebastianene@google.com>
Date: Fri, 16 Aug 2024 12:39:05 +0000
From: Sebastian Ene <sebastianene@...gle.com>
To: akpm@...ux-foundation.org, alexghiti@...osinc.com, ankita@...dia.com,
ardb@...nel.org, catalin.marinas@....com, christophe.leroy@...roup.eu,
james.morse@....com, vdonnefort@...gle.com, mark.rutland@....com,
maz@...nel.org, oliver.upton@...ux.dev, rananta@...gle.com,
ryan.roberts@....com, sebastianene@...gle.com, shahuang@...hat.com,
suzuki.poulose@....com, will@...nel.org, yuzenghui@...wei.com
Cc: kvmarm@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, kernel-team@...roid.com
Subject: [PATCH v8 5/6] KVM: arm64: Initialize the ptdump parser with stage-2 attributes
Define a set of attributes used by the ptdump parser to display the
properties of a guest memory region covered by a pagetable descriptor.
Build a description of the pagetable levels and initialize the parser
with this configuration.
Signed-off-by: Sebastian Ene <sebastianene@...gle.com>
---
arch/arm64/kvm/ptdump.c | 135 ++++++++++++++++++++++++++++++++++++++--
1 file changed, 129 insertions(+), 6 deletions(-)
diff --git a/arch/arm64/kvm/ptdump.c b/arch/arm64/kvm/ptdump.c
index 52483d56be2e..79be07ec3c3c 100644
--- a/arch/arm64/kvm/ptdump.c
+++ b/arch/arm64/kvm/ptdump.c
@@ -14,6 +14,51 @@
#include <kvm_ptdump.h>
+#define MARKERS_LEN (2)
+#define KVM_PGTABLE_MAX_LEVELS (KVM_PGTABLE_LAST_LEVEL + 1)
+
+struct kvm_ptdump_guest_state {
+ struct kvm *kvm;
+ struct ptdump_pg_state parser_state;
+ struct addr_marker ipa_marker[MARKERS_LEN];
+ struct ptdump_pg_level level[KVM_PGTABLE_MAX_LEVELS];
+ struct ptdump_range range[MARKERS_LEN];
+};
+
+static const struct ptdump_prot_bits stage2_pte_bits[] = {
+ {
+ .mask = PTE_VALID,
+ .val = PTE_VALID,
+ .set = " ",
+ .clear = "F",
+ }, {
+ .mask = KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R | PTE_VALID,
+ .val = KVM_PTE_LEAF_ATTR_LO_S2_S2AP_R | PTE_VALID,
+ .set = "R",
+ .clear = " ",
+ }, {
+ .mask = KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W | PTE_VALID,
+ .val = KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W | PTE_VALID,
+ .set = "W",
+ .clear = " ",
+ }, {
+ .mask = KVM_PTE_LEAF_ATTR_HI_S2_XN | PTE_VALID,
+ .val = PTE_VALID,
+ .set = " ",
+ .clear = "X",
+ }, {
+ .mask = KVM_PTE_LEAF_ATTR_LO_S2_AF | PTE_VALID,
+ .val = KVM_PTE_LEAF_ATTR_LO_S2_AF | PTE_VALID,
+ .set = "AF",
+ .clear = " ",
+ }, {
+ .mask = PTE_TABLE_BIT | PTE_VALID,
+ .val = PTE_VALID,
+ .set = "BLK",
+ .clear = " ",
+ },
+};
+
static int kvm_ptdump_visitor(const struct kvm_pgtable_visit_ctx *ctx,
enum kvm_pgtable_walk_flags visit)
{
@@ -40,15 +85,81 @@ static int kvm_ptdump_show_common(struct seq_file *m,
return kvm_pgtable_walk(pgtable, 0, BIT(pgtable->ia_bits), &walker);
}
+static int kvm_ptdump_build_levels(struct ptdump_pg_level *level, u32 start_lvl)
+{
+ static const char * const level_names[] = {"PGD", "PUD", "PMD", "PTE"};
+ u32 i = 0;
+ u64 mask = 0;
+
+ if (start_lvl > 2) {
+ pr_err("invalid start_lvl %u\n", start_lvl);
+ return -EINVAL;
+ }
+
+ if (WARN_ON_ONCE(start_lvl >= KVM_PGTABLE_LAST_LEVEL))
+ return -EINVAL;
+
+ for (i = 0; i < ARRAY_SIZE(stage2_pte_bits); i++)
+ mask |= stage2_pte_bits[i].mask;
+
+ for (i = start_lvl; i < KVM_PGTABLE_MAX_LEVELS; i++) {
+ strscpy(level[i].name, level_names[i], sizeof(level[i].name));
+
+ level[i].num = ARRAY_SIZE(stage2_pte_bits);
+ level[i].bits = stage2_pte_bits;
+ level[i].mask = mask;
+ }
+
+ if (start_lvl > 0)
+ strscpy(level[start_lvl].name, "PGD", sizeof(level[start_lvl].name));
+
+ return 0;
+}
+
+static struct kvm_ptdump_guest_state
+*kvm_ptdump_parser_init(struct kvm *kvm)
+{
+ struct kvm_ptdump_guest_state *st;
+ struct kvm_s2_mmu *mmu = &kvm->arch.mmu;
+ struct kvm_pgtable *pgtable = mmu->pgt;
+ int ret;
+
+ st = kzalloc(sizeof(struct kvm_ptdump_guest_state), GFP_KERNEL_ACCOUNT);
+ if (!st)
+ return NULL;
+
+ ret = kvm_ptdump_build_levels(&st->level[0], pgtable->start_level);
+ if (ret) {
+ kfree(st);
+ return ERR_PTR(ret);
+ }
+
+ st->ipa_marker[0].name = "Guest IPA";
+ st->ipa_marker[1].start_address = BIT(pgtable->ia_bits);
+ st->range[0].end = BIT(pgtable->ia_bits);
+
+ st->kvm = kvm;
+ st->parser_state = (struct ptdump_pg_state) {
+ .marker = &st->ipa_marker[0],
+ .level = -1,
+ .pg_level = &st->level[0],
+ .ptdump.range = &st->range[0],
+ };
+
+ return st;
+}
+
static int kvm_ptdump_guest_show(struct seq_file *m, void *unused)
{
- struct kvm *kvm = m->private;
+ struct kvm_ptdump_guest_state *st = m->private;
+ struct kvm *kvm = st->kvm;
struct kvm_s2_mmu *mmu = &kvm->arch.mmu;
- struct ptdump_pg_state parser_state = {0};
int ret;
+ st->parser_state.seq = m;
+
write_lock(&kvm->mmu_lock);
- ret = kvm_ptdump_show_common(m, mmu->pgt, &parser_state);
+ ret = kvm_ptdump_show_common(m, mmu->pgt, &st->parser_state);
write_unlock(&kvm->mmu_lock);
return ret;
@@ -57,22 +168,34 @@ static int kvm_ptdump_guest_show(struct seq_file *m, void *unused)
static int kvm_ptdump_guest_open(struct inode *m, struct file *file)
{
struct kvm *kvm = m->i_private;
+ struct kvm_ptdump_guest_state *st;
int ret;
if (!kvm_get_kvm_safe(kvm))
return -ENOENT;
- ret = single_open(file, kvm_ptdump_guest_show, m->i_private);
- if (ret < 0)
- kvm_put_kvm(kvm);
+ st = kvm_ptdump_parser_init(kvm);
+ if (IS_ERR(st)) {
+ ret = PTR_ERR(st);
+ goto free_with_kvm_ref;
+ }
+
+ ret = single_open(file, kvm_ptdump_guest_show, st);
+ if (!ret)
+ return 0;
+ kfree(st);
+free_with_kvm_ref:
+ kvm_put_kvm(kvm);
return ret;
}
static int kvm_ptdump_guest_close(struct inode *m, struct file *file)
{
struct kvm *kvm = m->i_private;
+ void *st = ((struct seq_file *)file->private_data)->private;
+ kfree(st);
kvm_put_kvm(kvm);
return single_release(m, file);
}
--
2.46.0.184.g6999bdac58-goog
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