linux-kernel - Re: [PATCH] KVM: X86: Reset the three MSR list number variables to 0 in kvm_init_msr

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Date:   Wed, 13 Nov 2019 09:20:41 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Xiaoyao Li <xiaoyao.li@...el.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Chenyi Qiang <chenyi.qiang@...el.com>
Subject: Re: [PATCH] KVM: X86: Reset the three MSR list number variables to 0
 in kvm_init_msr_list()

On 13/11/19 02:15, Xiaoyao Li wrote:
> When applying commit 7a5ee6edb42e ("KVM: X86: Fix initialization of MSR
> lists"), it forgot to reset the three MSR lists number varialbes to 0
> while removing the useless conditionals.
> 
> Fixes: 7a5ee6edb42e (KVM: X86: Fix initialization of MSR lists)
> Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
> ---
>  arch/x86/kvm/x86.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 8c8a5e20ea06..9368b0e6bf21 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -5102,6 +5102,10 @@ static void kvm_init_msr_list(void)
>  
>  	perf_get_x86_pmu_capability(&x86_pmu);
>  
> +	num_msrs_to_save = 0;
> +	num_emulated_msrs = 0;
> +	num_msr_based_features = 0;
> +
>  	for (i = 0; i < ARRAY_SIZE(msrs_to_save_all); i++) {
>  		if (rdmsr_safe(msrs_to_save_all[i], &dummy[0], &dummy[1]) < 0)
>  			continue;
> 

Ouch.  Sorry.

Paolo