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KVM: PPC: Book3S HV: Add KVM stat largepages_[2M/1G]

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This adds an entry to the kvm_stats_debugfs directory which provides the
number of large (2M or 1G) pages which have been used to setup the guest
mappings, for radix guests.

Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Suraj Jitindar Singh 2019-02-19 14:53:45 +11:00 committed by Paul Mackerras
parent a67614cc05
commit 8f1f7b9bed
3 changed files with 19 additions and 1 deletions
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2
arch/powerpc/include/asm/kvm_host.h
View File

@ -99,6 +99,8 @@ struct kvm_nested_guest;
struct kvm_vm_stat {
ulong remote_tlb_flush;
ulong num_2M_pages;
ulong num_1G_pages;
};
struct kvm_vcpu_stat {

3
arch/powerpc/kvm/book3s.c
View File

@ -39,6 +39,7 @@
#include "book3s.h"
#include "trace.h"
#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
/* #define EXIT_DEBUG */
@ -71,6 +72,8 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "pthru_all", VCPU_STAT(pthru_all) },
{ "pthru_host", VCPU_STAT(pthru_host) },
{ "pthru_bad_aff", VCPU_STAT(pthru_bad_aff) },
{ "largepages_2M", VM_STAT(num_2M_pages) },
{ "largepages_1G", VM_STAT(num_1G_pages) },
{ NULL }
};

15
arch/powerpc/kvm/book3s_64_mmu_radix.c
View File

@ -403,8 +403,13 @@ void kvmppc_unmap_pte(struct kvm *kvm, pte_t *pte, unsigned long gpa,
if (!memslot)
return;
}
if (shift)
if (shift) { /* 1GB or 2MB page */
page_size = 1ul << shift;
if (shift == PMD_SHIFT)
kvm->stat.num_2M_pages--;
else if (shift == PUD_SHIFT)
kvm->stat.num_1G_pages--;
}
gpa &= ~(page_size - 1);
hpa = old & PTE_RPN_MASK;
@ -878,6 +883,14 @@ int kvmppc_book3s_instantiate_page(struct kvm_vcpu *vcpu,
put_page(page);
}
/* Increment number of large pages if we (successfully) inserted one */
if (!ret) {
if (level == 1)
kvm->stat.num_2M_pages++;
else if (level == 2)
kvm->stat.num_1G_pages++;
}
return ret;
}