From afd28fe1c901429eba8957f54bdb4a13cc15ae44 Mon Sep 17 00:00:00 2001 From: Takuya Yoshikawa Date: Fri, 20 Nov 2015 17:44:55 +0900 Subject: [PATCH] KVM: x86: MMU: Remove is_rmap_spte() and use is_shadow_present_pte() is_rmap_spte(), originally named is_rmap_pte(), was introduced when the simple reverse mapping was implemented by commit cd4a4e5374110444 ("[PATCH] KVM: MMU: Implement simple reverse mapping"). At that point, its role was clear and only rmap_add() and rmap_remove() were using it to select sptes that need to be reverse-mapped. Independently of that, is_shadow_present_pte() was first introduced by commit c7addb902054195b ("KVM: Allow not-present guest page faults to bypass kvm") to do bypass_guest_pf optimization, which does not exist any more. These two seem to have changed their roles somewhat, and is_rmap_spte() just calls is_shadow_present_pte() now. Since using both of them without clear distinction just makes the code confusing, remove is_rmap_spte(). Signed-off-by: Takuya Yoshikawa Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu.c | 13 ++++--------- arch/x86/kvm/mmu_audit.c | 2 +- 2 files changed, 5 insertions(+), 10 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 74c120cd63fd..3104748eeb48 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -311,11 +311,6 @@ static int is_large_pte(u64 pte) return pte & PT_PAGE_SIZE_MASK; } -static int is_rmap_spte(u64 pte) -{ - return is_shadow_present_pte(pte); -} - static int is_last_spte(u64 pte, int level) { if (level == PT_PAGE_TABLE_LEVEL) @@ -540,7 +535,7 @@ static bool mmu_spte_update(u64 *sptep, u64 new_spte) u64 old_spte = *sptep; bool ret = false; - WARN_ON(!is_rmap_spte(new_spte)); + WARN_ON(!is_shadow_present_pte(new_spte)); if (!is_shadow_present_pte(old_spte)) { mmu_spte_set(sptep, new_spte); @@ -595,7 +590,7 @@ static int mmu_spte_clear_track_bits(u64 *sptep) else old_spte = __update_clear_spte_slow(sptep, 0ull); - if (!is_rmap_spte(old_spte)) + if (!is_shadow_present_pte(old_spte)) return 0; pfn = spte_to_pfn(old_spte); @@ -2575,7 +2570,7 @@ static bool mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep, unsigned pte_access, pgprintk("%s: spte %llx write_fault %d gfn %llx\n", __func__, *sptep, write_fault, gfn); - if (is_rmap_spte(*sptep)) { + if (is_shadow_present_pte(*sptep)) { /* * If we overwrite a PTE page pointer with a 2MB PMD, unlink * the parent of the now unreachable PTE. @@ -2919,7 +2914,7 @@ static bool fast_page_fault(struct kvm_vcpu *vcpu, gva_t gva, int level, * If the mapping has been changed, let the vcpu fault on the * same address again. */ - if (!is_rmap_spte(spte)) { + if (!is_shadow_present_pte(spte)) { ret = true; goto exit; } diff --git a/arch/x86/kvm/mmu_audit.c b/arch/x86/kvm/mmu_audit.c index f7b0488bc9d2..1cee3ec20dd2 100644 --- a/arch/x86/kvm/mmu_audit.c +++ b/arch/x86/kvm/mmu_audit.c @@ -183,7 +183,7 @@ static void check_mappings_rmap(struct kvm *kvm, struct kvm_mmu_page *sp) return; for (i = 0; i < PT64_ENT_PER_PAGE; ++i) { - if (!is_rmap_spte(sp->spt[i])) + if (!is_shadow_present_pte(sp->spt[i])) continue; inspect_spte_has_rmap(kvm, sp->spt + i); -- 2.20.1