KVM: s390: add stat counter for shadow gmap events

The shadow gmap tracks memory of nested guests (guest-3). In certain
scenarios, the shadow gmap needs to be rebuilt, which is a costly operation
since it involves a SIE exit into guest-1 for every entry in the respective
shadow level.

Add kvm stat counters when new shadow structures are created at various
levels. Also add a counter gmap_shadow_create when a completely fresh
shadow gmap is created as well as a counter gmap_shadow_reuse when an
existing gmap is being reused.

Note that when several levels are shadowed at once, counters on all
affected levels will be increased.

Also note that not all page table levels need to be present and a ASCE
can directly point to e.g. a segment table. In this case, a new segment
table will always be equivalent to a new shadow gmap and hence will be
counted as gmap_shadow_create and not as gmap_shadow_segment.

Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20231009093304.2555344-2-nrb@linux.ibm.com
Message-Id: <20231009093304.2555344-2-nrb@linux.ibm.com>

diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
index 427f9528a7b694820b7f0697940f6d7d06934dfe..67a298b6cf6e9f316ea6178ce64efc837e5caac9 100644 (file)
--- a/arch/s390/include/asm/kvm_host.h
+++ b/arch/s390/include/asm/kvm_host.h
@@ -777,6 +777,13 @@ struct kvm_vm_stat {
        u64 inject_service_signal;
        u64 inject_virtio;
        u64 aen_forward;
+       u64 gmap_shadow_create;
+       u64 gmap_shadow_reuse;
+       u64 gmap_shadow_r1_entry;
+       u64 gmap_shadow_r2_entry;
+       u64 gmap_shadow_r3_entry;
+       u64 gmap_shadow_sg_entry;
+       u64 gmap_shadow_pg_entry;
 };
 
 struct kvm_arch_memory_slot {

diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
index 6d6bc19b37dcbd25610df55a4e0b06a152187a96..ff8349d17b331a4222d57f826335bd209f359f6e 100644 (file)
--- a/arch/s390/kvm/gaccess.c
+++ b/arch/s390/kvm/gaccess.c
@@ -1382,6 +1382,7 @@ static int kvm_s390_shadow_tables(struct gmap *sg, unsigned long saddr,
                                  unsigned long *pgt, int *dat_protection,
                                  int *fake)
 {
+       struct kvm *kvm;
        struct gmap *parent;
        union asce asce;
        union vaddress vaddr;
@@ -1390,6 +1391,7 @@ static int kvm_s390_shadow_tables(struct gmap *sg, unsigned long saddr,
 
        *fake = 0;
        *dat_protection = 0;
+       kvm = sg->private;
        parent = sg->parent;
        vaddr.addr = saddr;
        asce.val = sg->orig_asce;
@@ -1450,6 +1452,7 @@ shadow_r2t:
                rc = gmap_shadow_r2t(sg, saddr, rfte.val, *fake);
                if (rc)
                        return rc;
+               kvm->stat.gmap_shadow_r1_entry++;
        }
                fallthrough;
        case ASCE_TYPE_REGION2: {
@@ -1478,6 +1481,7 @@ shadow_r3t:
                rc = gmap_shadow_r3t(sg, saddr, rste.val, *fake);
                if (rc)
                        return rc;
+               kvm->stat.gmap_shadow_r2_entry++;
        }
                fallthrough;
        case ASCE_TYPE_REGION3: {
@@ -1515,6 +1519,7 @@ shadow_sgt:
                rc = gmap_shadow_sgt(sg, saddr, rtte.val, *fake);
                if (rc)
                        return rc;
+               kvm->stat.gmap_shadow_r3_entry++;
        }
                fallthrough;
        case ASCE_TYPE_SEGMENT: {
@@ -1548,6 +1553,7 @@ shadow_pgt:
                rc = gmap_shadow_pgt(sg, saddr, ste.val, *fake);
                if (rc)
                        return rc;
+               kvm->stat.gmap_shadow_sg_entry++;
        }
        }
        /* Return the parent address of the page table */
@@ -1618,6 +1624,7 @@ shadow_page:
        pte.p |= dat_protection;
        if (!rc)
                rc = gmap_shadow_page(sg, saddr, __pte(pte.val));
+       vcpu->kvm->stat.gmap_shadow_pg_entry++;
        ipte_unlock(vcpu->kvm);
        mmap_read_unlock(sg->mm);
        return rc;

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index b3f17e014cab5d3d912c5393eac5498f3e135591..b42493110d766686ba59857a9f328fcc4aaab56d 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -66,7 +66,14 @@ const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
        STATS_DESC_COUNTER(VM, inject_pfault_done),
        STATS_DESC_COUNTER(VM, inject_service_signal),
        STATS_DESC_COUNTER(VM, inject_virtio),
-       STATS_DESC_COUNTER(VM, aen_forward)
+       STATS_DESC_COUNTER(VM, aen_forward),
+       STATS_DESC_COUNTER(VM, gmap_shadow_reuse),
+       STATS_DESC_COUNTER(VM, gmap_shadow_create),
+       STATS_DESC_COUNTER(VM, gmap_shadow_r1_entry),
+       STATS_DESC_COUNTER(VM, gmap_shadow_r2_entry),
+       STATS_DESC_COUNTER(VM, gmap_shadow_r3_entry),
+       STATS_DESC_COUNTER(VM, gmap_shadow_sg_entry),
+       STATS_DESC_COUNTER(VM, gmap_shadow_pg_entry),
 };
 
 const struct kvm_stats_header kvm_vm_stats_header = {

diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c
index 61499293c2ac3b955a7de66a366f955d144ae3b5..02dcbe82a8e512af4bd0f09f974d67d89f938d80 100644 (file)
--- a/arch/s390/kvm/vsie.c
+++ b/arch/s390/kvm/vsie.c
@@ -1214,8 +1214,10 @@ static int acquire_gmap_shadow(struct kvm_vcpu *vcpu,
         * we're holding has been unshadowed. If the gmap is still valid,
         * we can safely reuse it.
         */
-       if (vsie_page->gmap && gmap_shadow_valid(vsie_page->gmap, asce, edat))
+       if (vsie_page->gmap && gmap_shadow_valid(vsie_page->gmap, asce, edat)) {
+               vcpu->kvm->stat.gmap_shadow_reuse++;
                return 0;
+       }
 
        /* release the old shadow - if any, and mark the prefix as unmapped */
        release_gmap_shadow(vsie_page);
@@ -1223,6 +1225,7 @@ static int acquire_gmap_shadow(struct kvm_vcpu *vcpu,
        if (IS_ERR(gmap))
                return PTR_ERR(gmap);
        gmap->private = vcpu->kvm;
+       vcpu->kvm->stat.gmap_shadow_create++;
        WRITE_ONCE(vsie_page->gmap, gmap);
        return 0;
 }