linux-kernel - Re: [RFC PATCH 2/6] x86/kvm: Add a struct and constants for virtual suspend time injection

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Date:   Tue, 27 Apr 2021 16:14:46 +0100
From:   David Edmondson <dme@....org>
To:     Hikaru Nishida <hikalium@...omium.org>, kvm@...r.kernel.org
Cc:     suleiman@...gle.com, Hikaru Nishida <hikalium@...omium.org>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        John Stultz <john.stultz@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [RFC PATCH 2/6] x86/kvm: Add a struct and constants for virtual
 suspend time injection

On Monday, 2021-04-26 at 18:06:41 +09, Hikaru Nishida wrote:

> This patch adds definitions that are needed by both host and guest

s/This patch adds/Add/

> to implement virtual suspend time injection.
> This patch also adds #include <linux/kvm_host.h> in

s/This patch also adds/Also add/

> kernel/time/timekeeping.c to make necesarily functions which will be

s/necesarily/necessary/

> introduced in later patches available.
>
> Signed-off-by: Hikaru Nishida <hikalium@...omium.org>
> ---
>
>  arch/x86/include/uapi/asm/kvm_para.h | 6 ++++++
>  kernel/time/timekeeping.c            | 1 +
>  2 files changed, 7 insertions(+)
>
> diff --git a/arch/x86/include/uapi/asm/kvm_para.h b/arch/x86/include/uapi/asm/kvm_para.h
> index 950afebfba88..13788b01094f 100644
> --- a/arch/x86/include/uapi/asm/kvm_para.h
> +++ b/arch/x86/include/uapi/asm/kvm_para.h
> @@ -33,6 +33,7 @@
>  #define KVM_FEATURE_PV_SCHED_YIELD	13
>  #define KVM_FEATURE_ASYNC_PF_INT	14
>  #define KVM_FEATURE_MSI_EXT_DEST_ID	15
> +#define KVM_FEATURE_HOST_SUSPEND_TIME	16
>  
>  #define KVM_HINTS_REALTIME      0
>  
> @@ -54,6 +55,7 @@
>  #define MSR_KVM_POLL_CONTROL	0x4b564d05
>  #define MSR_KVM_ASYNC_PF_INT	0x4b564d06
>  #define MSR_KVM_ASYNC_PF_ACK	0x4b564d07
> +#define MSR_KVM_HOST_SUSPEND_TIME      0x4b564d08
>  
>  struct kvm_steal_time {
>  	__u64 steal;
> @@ -64,6 +66,10 @@ struct kvm_steal_time {
>  	__u32 pad[11];
>  };
>  
> +struct kvm_host_suspend_time {
> +	__u64   suspend_time_ns;
> +};
> +
>  #define KVM_VCPU_PREEMPTED          (1 << 0)
>  #define KVM_VCPU_FLUSH_TLB          (1 << 1)
>  
> diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
> index 6aee5768c86f..ff0304de7de9 100644
> --- a/kernel/time/timekeeping.c
> +++ b/kernel/time/timekeeping.c
> @@ -22,6 +22,7 @@
>  #include <linux/pvclock_gtod.h>
>  #include <linux/compiler.h>
>  #include <linux/audit.h>
> +#include <linux/kvm_host.h>
>  
>  #include "tick-internal.h"
>  #include "ntp_internal.h"
> -- 
> 2.31.1.498.g6c1eba8ee3d-goog

dme.
-- 
Too much information, running through my brain.