From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>, stable@vger.kernel.org
Subject: [FYI PATCH 5/5] x86/KVM: Clean up host's steal time structure
Date: Thu, 30 Jan 2020 19:01:56 +0100 [thread overview]
Message-ID: <1580407316-11391-6-git-send-email-pbonzini@redhat.com> (raw)
In-Reply-To: <1580407316-11391-1-git-send-email-pbonzini@redhat.com>
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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>
---
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 f48a306e..4925bdb 100644
--- 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
--- 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);
}
--
1.8.3.1
next prev parent reply other threads:[~2020-01-30 18:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-30 18:01 [FYI PATCH 0/5] Missing TLB flushes Paolo Bonzini
2020-01-30 18:01 ` [FYI PATCH 1/5] x86/kvm: Be careful not to clear KVM_VCPU_FLUSH_TLB bit Paolo Bonzini
2020-01-30 18:01 ` [FYI PATCH 2/5] x86/kvm: Introduce kvm_(un)map_gfn() Paolo Bonzini
2020-01-30 18:01 ` [FYI PATCH 3/5] x86/kvm: Cache gfn to pfn translation Paolo Bonzini
2020-01-30 18:01 ` [FYI PATCH 4/5] x86/KVM: Make sure KVM_VCPU_FLUSH_TLB flag is not missed Paolo Bonzini
2020-01-30 18:01 ` Paolo Bonzini [this message]
2020-02-01 5:53 ` [FYI PATCH 0/5] Missing TLB flushes Wanpeng Li
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1580407316-11391-6-git-send-email-pbonzini@redhat.com \
--to=pbonzini@redhat.com \
--cc=boris.ostrovsky@oracle.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).