linux-kernel - Re: [PATCH] kvm: vmx: Fix entry nubmer check for add_atomic_switch

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Date:   Fri, 15 Feb 2019 11:46:45 -0500
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Xiaoyao Li <xiaoyao.li@...ux.intel.com>
Cc:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] kvm: vmx: Fix entry nubmer check for
 add_atomic_switch_msr()

On Thu, Feb 14, 2019 at 12:08:58PM +0800, Xiaoyao Li wrote:
> Commit ca83b4a7f2d068da79a0 ("x86/KVM/VMX: Add find_msr() helper function")
> introduces the helper function find_msr(), which returns -ENOENT when
> not find the msr in vmx->msr_autoload.guest/host. Correct checking contion

s/not find/cannot find/
s/contion/condition/ ?

> of no more available entry in vmx->msr_autoload.
> 
> Fixes: ca83b4a7f2d0 ("x86/KVM/VMX: Add find_msr() helper function")
> Signed-off-by: Xiaoyao Li <xiaoyao.li@...ux.intel.com>
> ---
>  arch/x86/kvm/vmx/vmx.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 95d618045001..1aaef2d536bd 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -863,7 +863,8 @@ static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
>  	if (!entry_only)
>  		j = find_msr(&m->host, msr);
>  
> -	if (i == NR_AUTOLOAD_MSRS || j == NR_AUTOLOAD_MSRS) {
> +	if ((i < 0 && m->guest.nr == NR_AUTOLOAD_MSRS) ||
> +		(j < 0 &&  m->host.nr == NR_AUTOLOAD_MSRS)) {
>  		printk_once(KERN_WARNING "Not enough msr switch entries. "
>  				"Can't add msr %x\n", msr);
>  		return;
> -- 
> 2.19.1
>