From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH 1/2] kvm: vmx: Use basic exit reason to check if it's the specific VM EXIT
Date: Mon, 24 Feb 2020 14:04:46 +0100 [thread overview]
Message-ID: <87imjwp24x.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <d9744594-4a66-d867-f785-64ce4d42b848@intel.com>
Xiaoyao Li <xiaoyao.li@intel.com> writes:
> On 2/24/2020 6:16 PM, Vitaly Kuznetsov wrote:
>> Xiaoyao Li <xiaoyao.li@intel.com> writes:
>>
...
>>> rip = kvm_rip_read(vcpu);
>>> rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
>>> kvm_rip_write(vcpu, rip);
>>> @@ -5797,6 +5797,7 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu,
>>> {
>>> struct vcpu_vmx *vmx = to_vmx(vcpu);
>>> u32 exit_reason = vmx->exit_reason;
>>> + u16 basic_exit_reason = basic(exit_reason);
>>
>> I don't think renaming local variable is needed, let's just do
>>
>> 'u16 exit_reason = basic_exit_reason(vmx->exit_reason)' and keep the
>> rest of the code as-is.
>
> No, we can't do this.
>
> It's not just renaming local variable, the full 32-bit exit reason is
> used elsewhere in this function that needs the upper 16-bit.
>
> Here variable basic_exit_reason is added for the cases where only basic
> exit reason number is needed.
>
Can we do the other way around, i.e. introduce 'extended_exit_reason'
and use it where all 32 bits are needed? I'm fine with the change, just
trying to minimize the (unneeded) code churn.
--
Vitaly
next prev parent reply other threads:[~2020-02-24 13:04 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-24 2:07 [PATCH 0/2] KVM: VMX: Use basic exit reason for cheking and indexing Xiaoyao Li
2020-02-24 2:07 ` [PATCH 1/2] kvm: vmx: Use basic exit reason to check if it's the specific VM EXIT Xiaoyao Li
2020-02-24 10:16 ` Vitaly Kuznetsov
2020-02-24 12:01 ` Xiaoyao Li
2020-02-24 13:04 ` Vitaly Kuznetsov [this message]
2020-02-24 16:17 ` Sean Christopherson
2020-02-25 0:13 ` Xiaoyao Li
2020-02-25 6:13 ` Sean Christopherson
2020-02-25 6:41 ` Xiaoyao Li
2020-02-26 23:59 ` Sean Christopherson
2020-02-27 8:35 ` Xiaoyao Li
2020-02-27 23:57 ` Sean Christopherson
2020-02-25 0:27 ` Krish Sadhukhan
2020-02-25 13:11 ` Vitaly Kuznetsov
2020-02-25 18:28 ` Krish Sadhukhan
2020-02-24 2:07 ` [PATCH 2/2] kvm: nvmx: Use basic(exit_reason) when checking specific EXIT_REASON Xiaoyao Li
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