Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "ARM:

   - Correctly expose GICv3 support even if no irqchip is created so
     that userspace doesn't observe it changing pointlessly (fixing a
     regression with QEMU)

   - Don't issue a hypercall to set the id-mapped vectors when protected
     mode is enabled (fix for pKVM in combination with CPUs affected by
     Spectre-v3a)

  x86 (five oneliners, of which the most interesting two are):

   - a NULL pointer dereference on INVPCID executed with paging
     disabled, but only if KVM is using shadow paging

   - an incorrect bsearch comparison function which could truncate the
     result and apply PMU event filtering incorrectly. This one comes
     with a selftests update too"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: x86/mmu: fix NULL pointer dereference on guest INVPCID
  KVM: x86: hyper-v: fix type of valid_bank_mask
  KVM: Free new dirty bitmap if creating a new memslot fails
  KVM: eventfd: Fix false positive RCU usage warning
  selftests: kvm/x86: Verify the pmu event filter matches the correct event
  selftests: kvm/x86: Add the helper function create_pmu_event_filter
  kvm: x86/pmu: Fix the compare function used by the pmu event filter
  KVM: arm64: Don't hypercall before EL2 init
  KVM: arm64: vgic-v3: Consistently populate ID_AA64PFR0_EL1.GIC
  KVM: x86/mmu: Update number of zapped pages even if page list is stable

3 files changed, 17 insertions, 10 deletions

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 46f9dfb60469..a0702b6be3e8 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1914,7 +1914,7 @@ static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc)
 	struct hv_send_ipi_ex send_ipi_ex;
 	struct hv_send_ipi send_ipi;
 	DECLARE_BITMAP(vcpu_mask, KVM_MAX_VCPUS);
-	unsigned long valid_bank_mask;
+	u64 valid_bank_mask;
 	u64 sparse_banks[KVM_HV_MAX_SPARSE_VCPU_SET_BITS];
 	u32 vector;
 	bool all_cpus;
@@ -1956,7 +1956,7 @@ static u64 kvm_hv_send_ipi(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc)
 		valid_bank_mask = send_ipi_ex.vp_set.valid_bank_mask;
 		all_cpus = send_ipi_ex.vp_set.format == HV_GENERIC_SET_ALL;
 
-		if (hc->var_cnt != bitmap_weight(&valid_bank_mask, 64))
+		if (hc->var_cnt != bitmap_weight((unsigned long *)&valid_bank_mask, 64))
 			return HV_STATUS_INVALID_HYPERCALL_INPUT;
 
 		if (all_cpus)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 311e4e1d7870..45e1573f8f1d 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5470,14 +5470,16 @@ void kvm_mmu_invpcid_gva(struct kvm_vcpu *vcpu, gva_t gva, unsigned long pcid)
 	uint i;
 
 	if (pcid == kvm_get_active_pcid(vcpu)) {
-		mmu->invlpg(vcpu, gva, mmu->root.hpa);
+		if (mmu->invlpg)
+			mmu->invlpg(vcpu, gva, mmu->root.hpa);
 		tlb_flush = true;
 	}
 
 	for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) {
 		if (VALID_PAGE(mmu->prev_roots[i].hpa) &&
 		    pcid == kvm_get_pcid(vcpu, mmu->prev_roots[i].pgd)) {
-			mmu->invlpg(vcpu, gva, mmu->prev_roots[i].hpa);
+			if (mmu->invlpg)
+				mmu->invlpg(vcpu, gva, mmu->prev_roots[i].hpa);
 			tlb_flush = true;
 		}
 	}
@@ -5665,6 +5667,7 @@ static void kvm_zap_obsolete_pages(struct kvm *kvm)
 {
 	struct kvm_mmu_page *sp, *node;
 	int nr_zapped, batch = 0;
+	bool unstable;
 
 restart:
 	list_for_each_entry_safe_reverse(sp, node,
@@ -5696,11 +5699,12 @@ restart:
 			goto restart;
 		}
 
-		if (__kvm_mmu_prepare_zap_page(kvm, sp,
-				&kvm->arch.zapped_obsolete_pages, &nr_zapped)) {
-			batch += nr_zapped;
+		unstable = __kvm_mmu_prepare_zap_page(kvm, sp,
+				&kvm->arch.zapped_obsolete_pages, &nr_zapped);
+		batch += nr_zapped;
+
+		if (unstable)
 			goto restart;
-		}
 	}
 
 	/*
diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index eca39f56c231..0604bc29f0b8 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -171,9 +171,12 @@ static bool pmc_resume_counter(struct kvm_pmc *pmc)
 	return true;
 }
 
-static int cmp_u64(const void *a, const void *b)
+static int cmp_u64(const void *pa, const void *pb)
 {
-	return *(__u64 *)a - *(__u64 *)b;
+	u64 a = *(u64 *)pa;
+	u64 b = *(u64 *)pb;
+
+	return (a > b) - (a < b);
 }
 
 void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel)