linux-kernel - Re: [PATCH v2 1/7] KVM: s390: clean up redundant 'kvm

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <dc5e0fa3-558b-d606-bda9-ed281cf9e9ae@de.ibm.com>
Date:   Wed, 22 Apr 2020 17:58:04 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Cornelia Huck <cohuck@...hat.com>,
        Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
Cc:     pbonzini@...hat.com, tsbogend@...ha.franken.de, paulus@...abs.org,
        mpe@...erman.id.au, benh@...nel.crashing.org,
        frankja@...ux.ibm.com, david@...hat.com, heiko.carstens@...ibm.com,
        gor@...ux.ibm.com, sean.j.christopherson@...el.com,
        vkuznets@...hat.com, wanpengli@...cent.com, jmattson@...gle.com,
        joro@...tes.org, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de, x86@...nel.org, hpa@...or.com, maz@...nel.org,
        james.morse@....com, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com, christoffer.dall@....com,
        peterx@...hat.com, thuth@...hat.com, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-mips@...r.kernel.org, kvm-ppc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/7] KVM: s390: clean up redundant 'kvm_run' parameters



On 22.04.20 15:45, Cornelia Huck wrote:
> On Wed, 22 Apr 2020 20:58:04 +0800
> Tianjia Zhang <tianjia.zhang@...ux.alibaba.com> wrote:
> 
>> In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu'
>> structure. Earlier than historical reasons, many kvm-related function
> 
> s/Earlier than/For/ ?
> 
>> parameters retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time.
>> This patch does a unified cleanup of these remaining redundant parameters.
>>
>> Signed-off-by: Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>
>> ---
>>  arch/s390/kvm/kvm-s390.c | 37 ++++++++++++++++++++++---------------
>>  1 file changed, 22 insertions(+), 15 deletions(-)
>>
>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>> index e335a7e5ead7..d7bb2e7a07ff 100644
>> --- a/arch/s390/kvm/kvm-s390.c
>> +++ b/arch/s390/kvm/kvm-s390.c
>> @@ -4176,8 +4176,9 @@ static int __vcpu_run(struct kvm_vcpu *vcpu)
>>  	return rc;
>>  }
>>  
>> -static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>> +static void sync_regs_fmt2(struct kvm_vcpu *vcpu)
>>  {
>> +	struct kvm_run *kvm_run = vcpu->run;
>>  	struct runtime_instr_cb *riccb;
>>  	struct gs_cb *gscb;
>>  
>> @@ -4235,7 +4236,7 @@ static void sync_regs_fmt2(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
>>  		}
>>  		if (vcpu->arch.gs_enabled) {
>>  			current->thread.gs_cb = (struct gs_cb *)
>> -						&vcpu->run->s.regs.gscb;
>> +						&kvm_run->s.regs.gscb;
> 
> Not sure if these changes (vcpu->run-> => kvm_run->) are really worth
> it. (It seems they amount to at least as much as the changes advertised
> in the patch description.)
> 
> Other opinions?

Agreed. It feels kind of random. Maybe just do the first line (move kvm_run from the
function parameter list into the variable declaration)? Not sure if this is better.