> From: Jan Beulich <jbeul...@suse.com> > Sent: Tuesday, January 11, 2022 12:39 AM > > Signed-off-by: Jan Beulich <jbeul...@suse.com>
Reviewed-by: Kevin tian <kevin.t...@intel.com> > --- > v3: New. > > --- a/xen/drivers/passthrough/amd/iommu_map.c > +++ b/xen/drivers/passthrough/amd/iommu_map.c > @@ -283,6 +283,8 @@ static int iommu_pde_from_dfn(struct dom > level, PTE_kind_table); > > *flush_flags |= IOMMU_FLUSHF_modified; > + > + perfc_incr(iommu_pt_shatters); > } > > /* Install lower level page table for non-present entries */ > @@ -411,6 +413,7 @@ int amd_iommu_map_page(struct domain *d, > flags & IOMMUF_readable, &contig); > *flush_flags |= IOMMU_FLUSHF_modified | IOMMU_FLUSHF_all; > iommu_queue_free_pgtable(d, pg); > + perfc_incr(iommu_pt_coalesces); > } > > spin_unlock(&hd->arch.mapping_lock); > @@ -471,6 +474,7 @@ int amd_iommu_unmap_page(struct domain * > clear_iommu_pte_present(pt_mfn, dfn_x(dfn), level, &free); > *flush_flags |= IOMMU_FLUSHF_all; > iommu_queue_free_pgtable(d, pg); > + perfc_incr(iommu_pt_coalesces); > } > } > > --- a/xen/drivers/passthrough/vtd/iommu.c > +++ b/xen/drivers/passthrough/vtd/iommu.c > @@ -451,6 +451,8 @@ static uint64_t addr_to_dma_page_maddr(s > > if ( flush_flags ) > *flush_flags |= IOMMU_FLUSHF_modified; > + > + perfc_incr(iommu_pt_shatters); > } > > write_atomic(&pte->val, new_pte.val); > @@ -907,6 +909,7 @@ static int dma_pte_clear_one(struct doma > > *flush_flags |= IOMMU_FLUSHF_all; > iommu_queue_free_pgtable(domain, pg); > + perfc_incr(iommu_pt_coalesces); > } > > spin_unlock(&hd->arch.mapping_lock); > @@ -2099,6 +2102,7 @@ static int __must_check intel_iommu_map_ > > *flush_flags |= IOMMU_FLUSHF_modified | IOMMU_FLUSHF_all; > iommu_queue_free_pgtable(d, pg); > + perfc_incr(iommu_pt_coalesces); > } > > spin_unlock(&hd->arch.mapping_lock); > --- a/xen/arch/x86/include/asm/perfc_defn.h > +++ b/xen/arch/x86/include/asm/perfc_defn.h > @@ -125,4 +125,7 @@ PERFCOUNTER(realmode_exits, "vmexit > > PERFCOUNTER(pauseloop_exits, "vmexits from Pause-Loop Detection") > > +PERFCOUNTER(iommu_pt_shatters, "IOMMU page table shatters") > +PERFCOUNTER(iommu_pt_coalesces, "IOMMU page table coalesces") > + > /*#endif*/ /* __XEN_PERFC_DEFN_H__ */
