[PATCH 5.10 087/126] kvm: x86/mmu: Add existing trace points to TDP MMU

Greg Kroah-Hartman
2021-04-05T09:13:15Z

From: Ben Gardon <bgardon@google.com>

[ Upstream commit 33dd3574f5fef57c2c6caccf98925d63aa2a8d09 ]

The TDP MMU was initially implemented without some of the usual
tracepoints found in mmu.c. Correct this discrepancy by adding the
missing trace points to the TDP MMU.

Tested: ran the demand paging selftest on an Intel Skylake machine with
all the trace points used by the TDP MMU enabled and observed
them firing with expected values.

This patch can be viewed in Gerrit at:
https://linux-review.googlesource.com/c/virt/kvm/kvm/+/3812

Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20201027175944.1183301-1-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/kvm/mmu/tdp_mmu.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 0d17457f1c84..61be95c6db20 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -7,6 +7,8 @@
#include "tdp_mmu.h"
#include "spte.h"

+#include <trace/events/kvm.h>
+
#ifdef CONFIG_X86_64
static bool __read_mostly tdp_mmu_enabled = false;
module_param_named(tdp_mmu, tdp_mmu_enabled, bool, 0644);
@@ -149,6 +151,8 @@ static struct kvm_mmu_page *alloc_tdp_mmu_page(struct kvm_vcpu *vcpu, gfn_t gfn,
sp->gfn = gfn;
sp->tdp_mmu_page = true;

+ trace_kvm_mmu_get_page(sp, true);
+
return sp;
}

@@ -319,6 +323,8 @@ static void __handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
pt = spte_to_child_pt(old_spte, level);
sp = sptep_to_sp(pt);

+ trace_kvm_mmu_prepare_zap_page(sp);
+
list_del(&sp->link);

if (sp->lpage_disallowed)
@@ -530,11 +536,13 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, int write,
if (unlikely(is_noslot_pfn(pfn))) {
new_spte = make_mmio_spte(vcpu, iter->gfn, ACC_ALL);
trace_mark_mmio_spte(iter->sptep, iter->gfn, new_spte);
- } else
+ } else {
make_spte_ret = make_spte(vcpu, ACC_ALL, iter->level, iter->gfn,
pfn, iter->old_spte, prefault, true,
map_writable, !shadow_accessed_mask,
&new_spte);
+ trace_kvm_mmu_set_spte(iter->level, iter->gfn, iter->sptep);
+ }

if (new_spte == iter->old_spte)
ret = RET_PF_SPURIOUS;
@@ -740,6 +748,8 @@ static int age_gfn_range(struct kvm *kvm, struct kvm_memory_slot *slot,

tdp_mmu_set_spte_no_acc_track(kvm, &iter, new_spte);
young = 1;
+
+ trace_kvm_age_page(iter.gfn, iter.level, slot, young);
}

return young;
--
2.30.1