x86/KVM: Clean up host's steal time structure

Now that we are mapping kvm_steal_time from the guest directly we
don't need keep a copy of it in kvm_vcpu_arch.st. The same is true
for the stime field.

This is part of CVE-2019-3016.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Reviewed-by: Joao Martins <joao.m.martins@oracle.com>
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index f48a306..4925bdb 100644 (file)
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -685,10 +685,9 @@ struct kvm_vcpu_arch {
        bool pvclock_set_guest_stopped_request;
 
        struct {
+               u8 preempted;
                u64 msr_val;
                u64 last_steal;
-               struct gfn_to_hva_cache stime;
-               struct kvm_steal_time steal;
                struct gfn_to_pfn_cache cache;
        } st;
 

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f1845df..a0381ec 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2604,7 +2604,7 @@ static void record_steal_time(struct kvm_vcpu *vcpu)
        if (xchg(&st->preempted, 0) & KVM_VCPU_FLUSH_TLB)
                kvm_vcpu_flush_tlb(vcpu, false);
 
-       vcpu->arch.st.steal.preempted = 0;
+       vcpu->arch.st.preempted = 0;
 
        if (st->version & 1)
                st->version += 1;  /* first time write, random junk */
@@ -2788,11 +2788,6 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                if (data & KVM_STEAL_RESERVED_MASK)
                        return 1;
 
-               if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime,
-                                               data & KVM_STEAL_VALID_BITS,
-                                               sizeof(struct kvm_steal_time)))
-                       return 1;
-
                vcpu->arch.st.msr_val = data;
 
                if (!(data & KVM_MSR_ENABLED))
@@ -3509,7 +3504,7 @@ static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
        if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
                return;
 
-       if (vcpu->arch.st.steal.preempted)
+       if (vcpu->arch.st.preempted)
                return;
 
        if (kvm_map_gfn(vcpu, vcpu->arch.st.msr_val >> PAGE_SHIFT, &map,
@@ -3519,7 +3514,7 @@ static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
        st = map.hva +
                offset_in_page(vcpu->arch.st.msr_val & KVM_STEAL_VALID_BITS);
 
-       st->preempted = vcpu->arch.st.steal.preempted = KVM_VCPU_PREEMPTED;
+       st->preempted = vcpu->arch.st.preempted = KVM_VCPU_PREEMPTED;
 
        kvm_unmap_gfn(vcpu, &map, &vcpu->arch.st.cache, true, true);
 }