linux-kernel - Re: [PATCH v2 1/4] x86/hyper-v: move synic/stimer control structures definitions to hyperv-tlfs.h

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Date:   Mon, 26 Nov 2018 20:04:17 +0000
From:   Roman Kagan <rkagan@...tuozzo.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>
Subject: Re: [PATCH v2 1/4] x86/hyper-v: move synic/stimer control structures
 definitions to hyperv-tlfs.h

[ Sorry for having missed v1 ]

On Mon, Nov 26, 2018 at 04:47:29PM +0100, Vitaly Kuznetsov wrote:
> We implement Hyper-V SynIC and synthetic timers in KVM too so there's some
> room for code sharing.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  arch/x86/include/asm/hyperv-tlfs.h | 69 ++++++++++++++++++++++++++++++
>  drivers/hv/hv.c                    |  2 +-
>  drivers/hv/hyperv_vmbus.h          | 68 -----------------------------
>  3 files changed, 70 insertions(+), 69 deletions(-)
> 
> diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
> index 4139f7650fe5..b032c05cd3ee 100644
> --- a/arch/x86/include/asm/hyperv-tlfs.h
> +++ b/arch/x86/include/asm/hyperv-tlfs.h
> @@ -731,6 +731,75 @@ struct hv_enlightened_vmcs {
>  #define HV_STIMER_AUTOENABLE		(1ULL << 3)
>  #define HV_STIMER_SINT(config)		(__u8)(((config) >> 16) & 0x0F)
>  
> +/* Define synthetic interrupt controller flag constants. */
> +#define HV_EVENT_FLAGS_COUNT		(256 * 8)
> +#define HV_EVENT_FLAGS_LONG_COUNT	(256 / sizeof(unsigned long))
> +
> +/*
> + * Synthetic timer configuration.
> + */
> +union hv_stimer_config {
> +	u64 as_uint64;
> +	struct {
> +		u64 enable:1;
> +		u64 periodic:1;
> +		u64 lazy:1;
> +		u64 auto_enable:1;
> +		u64 apic_vector:8;
> +		u64 direct_mode:1;
> +		u64 reserved_z0:3;
> +		u64 sintx:4;
> +		u64 reserved_z1:44;
> +	};
> +};
> +
> +
> +/* Define the synthetic interrupt controller event flags format. */
> +union hv_synic_event_flags {
> +	unsigned long flags[HV_EVENT_FLAGS_LONG_COUNT];
> +};
> +
> +/* Define SynIC control register. */
> +union hv_synic_scontrol {
> +	u64 as_uint64;
> +	struct {
> +		u64 enable:1;
> +		u64 reserved:63;
> +	};
> +};
> +
> +/* Define synthetic interrupt source. */
> +union hv_synic_sint {
> +	u64 as_uint64;
> +	struct {
> +		u64 vector:8;
> +		u64 reserved1:8;
> +		u64 masked:1;
> +		u64 auto_eoi:1;
> +		u64 reserved2:46;
> +	};
> +};
> +
> +/* Define the format of the SIMP register */
> +union hv_synic_simp {
> +	u64 as_uint64;
> +	struct {
> +		u64 simp_enabled:1;
> +		u64 preserved:11;
> +		u64 base_simp_gpa:52;
> +	};
> +};
> +
> +/* Define the format of the SIEFP register */
> +union hv_synic_siefp {
> +	u64 as_uint64;
> +	struct {
> +		u64 siefp_enabled:1;
> +		u64 preserved:11;
> +		u64 base_siefp_gpa:52;
> +	};
> +};
> +
>  struct hv_vpset {
>  	u64 format;
>  	u64 valid_bank_mask;

I personally tend to prefer masks over bitfields, so I'd rather do the
consolidation in the opposite direction: use the definitions in
hyperv-tlfs.h and replace those unions/bitfields elsewhere.  (I vaguely
remember posting such a patchset a couple of years ago but I lacked the
motivation to complete it).

Roman.