From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Jim Mattson" <jmattson@google.com>,
"Liran Alon" <liran.alon@oracle.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC] KVM: x86: mmu: don't re-generate permissions/pkru_mask bitmasks when source is unchanged
Date: Mon, 09 Jul 2018 18:33:27 +0200 [thread overview]
Message-ID: <874lh8xtbc.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <20180709162357.15593-1-vkuznets@redhat.com> (Vitaly Kuznetsov's message of "Mon, 9 Jul 2018 18:23:57 +0200")
Vitaly Kuznetsov <vkuznets@redhat.com> writes:
> ...
I'm sorry for the screwed up Subject line)
--
Vitaly
prev parent reply other threads:[~2018-07-09 16:33 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-09 16:23 [PATCH RFC] KVM: x86: mmu: don't re-generate permissions/pkru_mask bitmasks when source is unchanged 1;5004;0c update_permission_bitmask()/update_pkru_bitmask() are rarely called under normal circumstances but nesting changes everything. E.g. for nVMX we call kvm_mmu_reset_context() from nested_vmx_load_cr3() which happens on nested vmexit/vmentry. init_kvm_mmu() in its turn call init_kvm_nested_mmu() or init_kvm_tdp_mmu() (which operate on arch.nested_mmu and arch.mmu respectively) which unconditionally do update_permission_bitmask()/ update_pkru_bitmask() Vitaly Kuznetsov
2018-07-09 16:33 ` Vitaly Kuznetsov [this message]
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