linux-kernel - Re: [PATCH v3] enable x2APIC without interrupt remapping under KVM

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Date:	Mon, 29 Jun 2009 07:58:39 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sheng Yang <sheng@...ux.intel.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"avi@...hat.com" <avi@...hat.com>
Subject: Re: [PATCH v3] enable x2APIC without interrupt remapping under KVM

On Mon, 2009-06-29 at 06:29 -0700, Gleb Natapov wrote:
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index d1430ef..3e5b6ea 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -260,12 +260,15 @@ config SMP
>  
>  config X86_X2APIC
>  	bool "Support x2apic"
> -	depends on X86_LOCAL_APIC && X86_64 && INTR_REMAP
> +	depends on X86_LOCAL_APIC && X86_64

Thinking more, probably we shouldn't remove this dependency. This might
encourage people (knowingly or unknowingly) to enable x2apic without
interrupt-remapping. Can we remove this? KVM mode will still work even
if we fail to enable interrupt-remapping. So this shouldn't be an issue,
correct?

Sorry I should have commented about this before.

>  
>  	ioapic_entries = alloc_ioapic_entries();
>  	if (!ioapic_entries) {
> -		pr_info("Allocate ioapic_entries failed: %d\n", ret);
> -		goto end;
> +		 pr_info("Allocate ioapic_entries failed\n");
> +		 return;


We should go to ir_failed ..

>  	}
>  
>  	ret = save_IO_APIC_setup(ioapic_entries);
>  	if (ret) {
>  		pr_info("Saving IO-APIC state failed: %d\n", ret);
> -		goto end;
> +		free_ioapic_entries(ioapic_entries);
> +		return;

same here.

In few hours I will be on 24 hour flight. So please bear with me for
delayed responses.

thanks,
suresh

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