From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org, Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <seanjc@google.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>,
Maxim Levitsky <mlevitsk@redhat.com>,
Vineeth Pillai <viremana@linux.microsoft.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH 1/5] KVM: SVM: Drop stale comment from svm_hv_vmcb_dirty_nested_enlightenments()
Date: Mon, 20 Dec 2021 16:21:35 +0100 [thread overview]
Message-ID: <20211220152139.418372-2-vkuznets@redhat.com> (raw)
In-Reply-To: <20211220152139.418372-1-vkuznets@redhat.com>
Commit 3fa5e8fd0a0e4 ("KVM: SVM: delay svm_vcpu_init_msrpm after
svm->vmcb is initialized") re-arranged svm_vcpu_init_msrpm() call in
svm_create_vcpu() making the comment about vmcb being NULL
obsolete. Drop it.
While on it, drop superfluous vmcb_is_clean() check: vmcb_mark_dirty()
is a bit flip, an extra check is unlikely to bring any performance gain.
Drop now-unneeded vmcb_is_clean() helper as well.
Fixes: 3fa5e8fd0a0e4 ("KVM: SVM: delay svm_vcpu_init_msrpm after svm->vmcb is initialized")
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
arch/x86/kvm/svm/svm.h | 5 -----
arch/x86/kvm/svm/svm_onhyperv.h | 9 +--------
2 files changed, 1 insertion(+), 13 deletions(-)
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index daa8ca84afcc..5d197aae3a19 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -305,11 +305,6 @@ static inline void vmcb_mark_all_clean(struct vmcb *vmcb)
& ~VMCB_ALWAYS_DIRTY_MASK;
}
-static inline bool vmcb_is_clean(struct vmcb *vmcb, int bit)
-{
- return (vmcb->control.clean & (1 << bit));
-}
-
static inline void vmcb_mark_dirty(struct vmcb *vmcb, int bit)
{
vmcb->control.clean &= ~(1 << bit);
diff --git a/arch/x86/kvm/svm/svm_onhyperv.h b/arch/x86/kvm/svm/svm_onhyperv.h
index c53b8bf8d013..cdbcfc63d171 100644
--- a/arch/x86/kvm/svm/svm_onhyperv.h
+++ b/arch/x86/kvm/svm/svm_onhyperv.h
@@ -83,14 +83,7 @@ static inline void svm_hv_vmcb_dirty_nested_enlightenments(
struct hv_enlightenments *hve =
(struct hv_enlightenments *)vmcb->control.reserved_sw;
- /*
- * vmcb can be NULL if called during early vcpu init.
- * And its okay not to mark vmcb dirty during vcpu init
- * as we mark it dirty unconditionally towards end of vcpu
- * init phase.
- */
- if (vmcb_is_clean(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS) &&
- hve->hv_enlightenments_control.msr_bitmap)
+ if (hve->hv_enlightenments_control.msr_bitmap)
vmcb_mark_dirty(vmcb, VMCB_HV_NESTED_ENLIGHTENMENTS);
}
--
2.33.1
next prev parent reply other threads:[~2021-12-20 15:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-20 15:21 [PATCH 0/5] KVM: SVM: nSVM: Implement Enlightened MSR-Bitmap for Hyper-V-on-KVM and fix it for KVM-on-Hyper-V Vitaly Kuznetsov
2021-12-20 15:21 ` Vitaly Kuznetsov [this message]
2022-01-25 15:57 ` [PATCH 1/5] KVM: SVM: Drop stale comment from svm_hv_vmcb_dirty_nested_enlightenments() Paolo Bonzini
2021-12-20 15:21 ` [PATCH 2/5] KVM: SVM: hyper-v: Enable Enlightened MSR-Bitmap support for real Vitaly Kuznetsov
2022-01-25 15:53 ` Paolo Bonzini
2021-12-20 15:21 ` [PATCH 3/5] KVM: nSVM: Track whether changes in L0 require MSR bitmap for L2 to be rebuilt Vitaly Kuznetsov
2021-12-20 15:21 ` [PATCH 4/5] KVM: x86: Make kvm_hv_hypercall_enabled() static inline Vitaly Kuznetsov
2021-12-20 15:21 ` [PATCH 5/5] KVM: nSVM: Implement Enlightened MSR-Bitmap feature Vitaly Kuznetsov
2022-02-01 13:49 ` [PATCH 0/5] KVM: SVM: nSVM: Implement Enlightened MSR-Bitmap for Hyper-V-on-KVM and fix it for KVM-on-Hyper-V Paolo Bonzini
2022-02-01 14:31 ` Vitaly Kuznetsov
2022-02-01 18:30 ` Paolo Bonzini
2022-02-01 18:58 ` Vitaly Kuznetsov
2022-02-01 19:22 ` Paolo Bonzini
2022-02-02 9:52 ` Vitaly Kuznetsov
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