linux-kernel - Re: [PATCH 2/3] KVM: x86: cleanup kvm_inject_emulated_page

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Message-ID: <d2222e81-8618-b3b0-baf3-2bda72d48ede@redhat.com>
Date:   Thu, 26 Mar 2020 20:45:47 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     Junaid Shahid <junaids@...gle.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH 2/3] KVM: x86: cleanup kvm_inject_emulated_page_fault

On 26/03/20 14:41, Vitaly Kuznetsov wrote:
> Paolo Bonzini <pbonzini@...hat.com> writes:
> 
>> To reconstruct the kvm_mmu to be used for page fault injection, we
>> can simply use fault->nested_page_fault.  This matches how
>> fault->nested_page_fault is assigned in the first place by
>> FNAME(walk_addr_generic).
>>
>> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
>> ---
>>  arch/x86/kvm/mmu/mmu.c         | 6 ------
>>  arch/x86/kvm/mmu/paging_tmpl.h | 2 +-
>>  arch/x86/kvm/x86.c             | 7 +++----
>>  3 files changed, 4 insertions(+), 11 deletions(-)
>>
>> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
>> index e26c9a583e75..6250e31ac617 100644
>> --- a/arch/x86/kvm/mmu/mmu.c
>> +++ b/arch/x86/kvm/mmu/mmu.c
>> @@ -4353,12 +4353,6 @@ static unsigned long get_cr3(struct kvm_vcpu *vcpu)
>>  	return kvm_read_cr3(vcpu);
>>  }
>>  
>> -static void inject_page_fault(struct kvm_vcpu *vcpu,
>> -			      struct x86_exception *fault)
>> -{
>> -	vcpu->arch.mmu->inject_page_fault(vcpu, fault);
>> -}
>> -
> 
> This is already gone with Sean's "KVM: x86: Consolidate logic for
> injecting page faults to L1".
> 
> It would probably make sense to have a combined series (or a branch on
> kvm.git) to simplify testing efforts.

Yes, these three patches replace part of Sean's (the patch you mention
and the next one, "KVM: x86: Sync SPTEs when injecting page/EPT fault
into L1").

I pushed the result to a branch named kvm-tlb-cleanup on kvm.git.

Paolo