From: Emanuele Giuseppe Esposito <eesposit@redhat.com>
To: kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Maxim Levitsky <mlevitsk@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
linux-kernel@vger.kernel.org,
Emanuele Giuseppe Esposito <eesposit@redhat.com>
Subject: [PATCH v3 4/8] nSVM: use vmcb_save_area_cached in nested_vmcb_valid_sregs()
Date: Mon, 11 Oct 2021 10:36:58 -0400 [thread overview]
Message-ID: <20211011143702.1786568-5-eesposit@redhat.com> (raw)
In-Reply-To: <20211011143702.1786568-1-eesposit@redhat.com>
Now that struct vmcb_save_area_cached contains the required
vmcb fields values (done in nested_load_save_from_vmcb12()),
check them to see if they are correct in nested_vmcb_valid_sregs().
Since we are always checking for the nested struct, it is enough
to have only the vcpu as parameter.
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
---
arch/x86/kvm/svm/nested.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index f6030a202bc5..d07cd4b88acd 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -230,9 +230,10 @@ static bool nested_vmcb_check_controls(struct kvm_vcpu *vcpu,
}
/* Common checks that apply to both L1 and L2 state. */
-static bool nested_vmcb_valid_sregs(struct kvm_vcpu *vcpu,
- struct vmcb_save_area *save)
+static bool nested_vmcb_valid_sregs(struct kvm_vcpu *vcpu)
{
+ struct vcpu_svm *svm = to_svm(vcpu);
+ struct vmcb_save_area_cached *save = &svm->nested.save;
/*
* FIXME: these should be done after copying the fields,
* to avoid TOC/TOU races. For these save area checks
@@ -658,7 +659,7 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu)
nested_copy_vmcb_control_to_cache(svm, &vmcb12->control);
nested_copy_vmcb_save_to_cache(svm, &vmcb12->save);
- if (!nested_vmcb_valid_sregs(vcpu, &vmcb12->save) ||
+ if (!nested_vmcb_valid_sregs(vcpu) ||
!nested_vmcb_check_controls(vcpu, &svm->nested.ctl)) {
vmcb12->control.exit_code = SVM_EXIT_ERR;
vmcb12->control.exit_code_hi = 0;
@@ -1355,11 +1356,12 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
* Validate host state saved from before VMRUN (see
* nested_svm_check_permissions).
*/
+ nested_copy_vmcb_save_to_cache(svm, save);
if (!(save->cr0 & X86_CR0_PG) ||
!(save->cr0 & X86_CR0_PE) ||
(save->rflags & X86_EFLAGS_VM) ||
- !nested_vmcb_valid_sregs(vcpu, save))
- goto out_free;
+ !nested_vmcb_valid_sregs(vcpu))
+ goto out_free_save;
/*
* While the nested guest CR3 is already checked and set by
@@ -1371,7 +1373,7 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
ret = nested_svm_load_cr3(&svm->vcpu, vcpu->arch.cr3,
nested_npt_enabled(svm), false);
if (WARN_ON_ONCE(ret))
- goto out_free;
+ goto out_free_save;
/*
@@ -1395,12 +1397,15 @@ static int svm_set_nested_state(struct kvm_vcpu *vcpu,
svm_copy_vmrun_state(&svm->vmcb01.ptr->save, save);
nested_copy_vmcb_control_to_cache(svm, ctl);
- nested_copy_vmcb_save_to_cache(svm, save);
svm_switch_vmcb(svm, &svm->nested.vmcb02);
nested_vmcb02_prepare_control(svm);
kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
ret = 0;
+
+out_free_save:
+ memset(&svm->nested.save, 0, sizeof(struct vmcb_save_area_cached));
+
out_free:
kfree(save);
kfree(ctl);
--
2.27.0
next prev parent reply other threads:[~2021-10-11 14:38 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-11 14:36 [PATCH v3 0/8] KVM: nSVM: avoid TOC/TOU race when checking vmcb12 Emanuele Giuseppe Esposito
2021-10-11 14:36 ` [PATCH v3 1/8] KVM: nSVM: move nested_vmcb_check_cr3_cr4 logic in nested_vmcb_valid_sregs Emanuele Giuseppe Esposito
2021-10-11 14:36 ` [PATCH v3 2/8] nSVM: introduce smv->nested.save to cache save area fields Emanuele Giuseppe Esposito
2021-10-22 14:46 ` Maxim Levitsky
2021-10-11 14:36 ` [PATCH v3 3/8] nSVM: rename nested_load_control_from_vmcb12 in nested_copy_vmcb_control_to_cache Emanuele Giuseppe Esposito
2021-10-22 14:46 ` Maxim Levitsky
2021-10-11 14:36 ` Emanuele Giuseppe Esposito [this message]
2021-10-22 7:14 ` [PATCH v3 4/8] nSVM: use vmcb_save_area_cached in nested_vmcb_valid_sregs() Paolo Bonzini
2021-10-22 13:48 ` Emanuele Giuseppe Esposito
2021-10-22 14:48 ` Maxim Levitsky
2021-10-11 14:36 ` [PATCH v3 5/8] nSVM: use svm->nested.save to load vmcb12 registers and avoid TOC/TOU races Emanuele Giuseppe Esposito
2021-10-22 14:48 ` Maxim Levitsky
2021-10-11 14:37 ` [PATCH v3 6/8] nSVM: introduce struct vmcb_ctrl_area_cached Emanuele Giuseppe Esposito
2021-10-22 14:49 ` Maxim Levitsky
2021-10-11 14:37 ` [PATCH v3 7/8] nSVM: use vmcb_ctrl_area_cached instead of vmcb_control_area in struct svm_nested_state Emanuele Giuseppe Esposito
2021-10-22 7:14 ` Paolo Bonzini
2021-10-22 14:50 ` Maxim Levitsky
2021-10-11 14:37 ` [PATCH v3 8/8] nSVM: remove unnecessary parameter in nested_vmcb_check_controls Emanuele Giuseppe Esposito
2021-10-22 14:51 ` Maxim Levitsky
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