From 87917239204d67a316cb89751750f86c9ed3640b Mon Sep 17 00:00:00 2001 From: Marcelo Tosatti Date: Mon, 22 Dec 2008 18:49:30 -0200 Subject: [PATCH] KVM: MMU: handle large host sptes on invlpg/resync The invlpg and sync walkers lack knowledge of large host sptes, descending to non-existant pagetable level. Stop at directory level in such case. Fixes SMP Windows XP with hugepages. Signed-off-by: Marcelo Tosatti Signed-off-by: Avi Kivity --- arch/x86/kvm/mmu.c | 2 +- arch/x86/kvm/paging_tmpl.h | 9 +++++++-- 2 files changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index d50ebac..83f11c7 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1007,7 +1007,7 @@ static int __mmu_unsync_walk(struct kvm_mmu_page *sp, for_each_unsync_children(sp->unsync_child_bitmap, i) { u64 ent = sp->spt[i]; - if (is_shadow_present_pte(ent)) { + if (is_shadow_present_pte(ent) && !is_large_pte(ent)) { struct kvm_mmu_page *child; child = page_header(ent & PT64_BASE_ADDR_MASK); diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index d206401..9fd78b6 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -472,14 +472,19 @@ static int FNAME(shadow_invlpg_entry)(struct kvm_shadow_walk *_sw, struct shadow_walker *sw = container_of(_sw, struct shadow_walker, walker); - if (level == PT_PAGE_TABLE_LEVEL) { + /* FIXME: properly handle invlpg on large guest pages */ + if (level == PT_PAGE_TABLE_LEVEL || + ((level == PT_DIRECTORY_LEVEL) && is_large_pte(*sptep))) { struct kvm_mmu_page *sp = page_header(__pa(sptep)); sw->pte_gpa = (sp->gfn << PAGE_SHIFT); sw->pte_gpa += (sptep - sp->spt) * sizeof(pt_element_t); - if (is_shadow_present_pte(*sptep)) + if (is_shadow_present_pte(*sptep)) { rmap_remove(vcpu->kvm, sptep); + if (is_large_pte(*sptep)) + --vcpu->kvm->stat.lpages; + } set_shadow_pte(sptep, shadow_trap_nonpresent_pte); return 1; } -- 1.8.2.3