Messages in this thread | | | Date | Wed, 24 Nov 2021 08:24:48 +0800 | Subject | Re: [PATCH MANUALSEL 5.15 2/8] KVM: X86: Don't reset mmu context when X86_CR4_PCIDE 1->0 | From | Lai Jiangshan <> |
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Hello,
[PATCH MANUALSEL 5.15 2/8] KVM: X86: Don't reset mmu context when X86_CR4_PCIDE 1->0 [PATCH MANUALSEL 5.15 3/8] KVM: X86: Don't check unsync if the original spte is writible
are pure cleanups, they don't need to backport to stable.
Thanks Lai
On 2021/11/24 00:36, Sasha Levin wrote: > From: Lai Jiangshan <laijs@linux.alibaba.com> > > [ Upstream commit 552617382c197949ff965a3559da8952bf3c1fa5 ] > > X86_CR4_PCIDE doesn't participate in kvm_mmu_role, so the mmu context > doesn't need to be reset. It is only required to flush all the guest > tlb. > > Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com> > Reviewed-by: Sean Christopherson <seanjc@google.com> > Message-Id: <20210919024246.89230-2-jiangshanlai@gmail.com> > Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> > Signed-off-by: Sasha Levin <sashal@kernel.org> > --- > arch/x86/kvm/x86.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 0644f429f848c..98a0f3c28caec 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -1042,9 +1042,10 @@ EXPORT_SYMBOL_GPL(kvm_is_valid_cr4); > > void kvm_post_set_cr4(struct kvm_vcpu *vcpu, unsigned long old_cr4, unsigned long cr4) > { > - if (((cr4 ^ old_cr4) & KVM_MMU_CR4_ROLE_BITS) || > - (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE))) > + if ((cr4 ^ old_cr4) & KVM_MMU_CR4_ROLE_BITS) > kvm_mmu_reset_context(vcpu); > + else if (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE)) > + kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu); > } > EXPORT_SYMBOL_GPL(kvm_post_set_cr4); > >
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