linux-kernel - Re: [PATCH 7/7] kvm x86: report 1GB page support to userspace

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Date:	Sun, 29 Mar 2009 14:54:31 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Joerg Roedel <joerg.roedel@....com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/7] kvm x86: report 1GB page support to userspace

Joerg Roedel wrote:
> If userspace knows that the kernel part supports 1GB pages it can enable
> the corresponding cpuid bit so that guests actually use GB pages.
>   

> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index a1df2a3..6593198 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -542,6 +542,8 @@ struct kvm_x86_ops {
>  	int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
>  	int (*get_tdp_level)(void);
>  	int (*get_mt_mask_shift)(void);
> +
> +	bool (*gb_page_enable)(void);
>  };
>   

Should enable unconditionally.  Of course we need to find the shadow bug 
first, may be the has_wrprotected thingy.

> diff --git a/include/linux/kvm.h b/include/linux/kvm.h
> index ee755e2..e79eb26 100644
> --- a/include/linux/kvm.h
> +++ b/include/linux/kvm.h
> @@ -413,6 +413,7 @@ struct kvm_trace_rec {
>  #define KVM_CAP_DEVICE_MSIX 28
>  #endif
>  #define KVM_CAP_ASSIGN_DEV_IRQ 29
> +#define KVM_CAP_1GB_PAGES 30
>  
>  #ifdef KVM_CAP_IRQ_ROUTING
>  
>   

Need KVM_GET_SUPPORTED_CPUID2 support as well.

-- 
error compiling committee.c: too many arguments to function

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