linux-kernel - Re: [PART1 RFC v2 03/10] svm: Introduce new AVIC VMCB registers

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Date:	Mon, 7 Mar 2016 16:44:15 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	rkrcmar@...hat.com, joro@...tes.org, bp@...en8.de, gleb@...nel.org,
	alex.williamson@...hat.com
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, wei@...hat.com,
	sherry.hurwitz@....com
Subject: Re: [PART1 RFC v2 03/10] svm: Introduce new AVIC VMCB registers



On 04/03/2016 21:46, Suravee Suthikulpanit wrote:
> From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> 
> Introduce new AVIC VMCB registers. Also breakdown int_ctl register
> into bit-field for ease of use.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>  arch/x86/include/asm/svm.h | 29 ++++++++++++++++++++++++-----
>  1 file changed, 24 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
> index 6136d99..db5d7af 100644
> --- a/arch/x86/include/asm/svm.h
> +++ b/arch/x86/include/asm/svm.h
> @@ -67,10 +67,24 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
>  	u32 asid;
>  	u8 tlb_ctl;
>  	u8 reserved_2[3];
> -	u32 int_ctl;
> +	union { /* Offset 0x60 */
> +		u32 int_ctl;
> +
> +		struct __attribute__ ((__packed__)) {
> +			u32 v_tpr		: 8,
> +			    v_irq		: 1,
> +			    reserved_3		: 7,
> +			    v_intr_prio		: 4,
> +			    v_ign_tpr		: 1,
> +			    reserved_4		: 3,
> +			    v_intr_masking	: 1,
> +			    reserved_5		: 6,
> +			    avic_enable		: 1;

Please do not introduce bitfields and drop patch 4.

Thanks,

Paolo

> +		};
> +	};
>  	u32 int_vector;
>  	u32 int_state;
> -	u8 reserved_3[4];
> +	u8 reserved_6[4];
>  	u32 exit_code;
>  	u32 exit_code_hi;
>  	u64 exit_info_1;
> @@ -78,17 +92,22 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
>  	u32 exit_int_info;
>  	u32 exit_int_info_err;
>  	u64 nested_ctl;
> -	u8 reserved_4[16];
> +	u64 avic_vapic_bar;
> +	u8 reserved_7[8];
>  	u32 event_inj;
>  	u32 event_inj_err;
>  	u64 nested_cr3;
>  	u64 lbr_ctl;
>  	u32 clean;
> -	u32 reserved_5;
> +	u32 reserved_8;
>  	u64 next_rip;
>  	u8 insn_len;
>  	u8 insn_bytes[15];
> -	u8 reserved_6[800];
> +	u64 avic_bk_page;	/* Offset 0xe0 */
> +	u8 reserved_9[8];	/* Offset 0xe8 */
> +	u64 avic_log_apic_id;	/* Offset 0xf0 */
> +	u64 avic_phy_apic_id;	/* Offset 0xf8 */
> +	u8 reserved_10[768];
>  };
>  
>  
>