linux-kernel - Re: [PATCH v2 2/7] KVM-HDR: KVM Steal time implementation

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Message-ID: <4DFDC63B.3000209@redhat.com>
Date:	Sun, 19 Jun 2011 12:49:47 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Glauber Costa <glommer@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rik van Riel <riel@...hat.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Anthony Liguori <aliguori@...ibm.com>,
	Eric B Munson <emunson@...bm.net>
Subject: Re: [PATCH v2 2/7] KVM-HDR: KVM Steal time implementation

On 06/17/2011 01:20 AM, Glauber Costa wrote:
> To implement steal time, we need the hypervisor to pass the guest information
> about how much time was spent running other processes outside the VM.
> This is per-vcpu, and using the kvmclock structure for that is an abuse
> we decided not to make.
>
> In this patchset, I am introducing a new msr, KVM_MSR_STEAL_TIME, that
> holds the memory area address containing information about steal time
>
> This patch contains the headers for it. I am keeping it separate to facilitate
> backports to people who wants to backport the kernel part but not the
> hypervisor, or the other way around.
>
>
> index d079aed..79c12a7 100644
> --- a/Documentation/virtual/kvm/msr.txt
> +++ b/Documentation/virtual/kvm/msr.txt
> @@ -185,3 +185,36 @@ MSR_KVM_ASYNC_PF_EN: 0x4b564d02
>
>   	Currently type 2 APF will be always delivered on the same vcpu as
>   	type 1 was, but guest should not rely on that.
> +
> +MSR_KVM_STEAL_TIME: 0x4b564d03
> +
> +	data: 64-byte alignment physical address of a memory area which must be
> +	in guest RAM, plus an enable bit in bit 0. This memory is expected to
> +	hold a copy of the following structure:
> +
> +	struct kvm_steal_time {
> +	  	__u64 steal;
> + 		__u32 version;
> + 		__u32 flags;
> +	 	__u32 pad[6];

Should be 12 to be a 64-byte structure, no?



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

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