From: Boris Ostrovsky Date: Fri, 6 Dec 2019 15:36:12 +0000 Subject: [11/11] x86/KVM: Clean up host's steal time structure Origin: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit?id=c434092ef8172ed027f2bd9afcd42c0ee5002b85 Bug-Debian-Security: https://security-tracker.debian.org/tracker/CVE-2019-3016 commit a6bd811f1209fe1c64c9f6fd578101d6436c6b6e upstream. 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 Reviewed-by: Joao Martins Signed-off-by: Paolo Bonzini Signed-off-by: Ben Hutchings Signed-off-by: Sasha Levin --- arch/x86/include/asm/kvm_host.h | 3 +-- arch/x86/kvm/x86.c | 11 +++-------- 2 files changed, 4 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index ca9c7110b99d..33136395db8f 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -622,10 +622,9 @@ 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 d77822e03ff6..6bfc9eaf8dee 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2418,7 +2418,7 @@ 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 */ @@ -2577,11 +2577,6 @@ 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)) @@ -3280,7 +3275,7 @@ 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, @@ -3290,7 +3285,7 @@ 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); } -- 2.27.0.rc0