linux-kernel - Re: [kvm-devel] include files for kvmclock

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Date:	Wed, 07 Nov 2007 17:16:37 +0900
From:	Akio Takebe <takebe_akio@...fujitsu.com>
To:	Glauber de Oliveira Costa <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org
Cc:	jeremy@...p.org, hollisb@...ibm.com,
	kvm-devel@...ts.sourceforge.net, avi@...ranet.com
Subject: Re: [kvm-devel] include files for kvmclock

Hi, Glauber

This is interesting facility. :-)

>+#define KVM_HCALL_REGISTER_CLOCK	1
>+
>+union kvm_hv_clock {
>+	struct {
>+		u64 tsc_mult;
>+		u64 now_ns;
>+		/* That's the wall clock, not the water closet */
>+		u64 wc_sec;
>+		u64 wc_nsec;
>+		u64 last_tsc;
>+		/* At first, we could use the tsc value as a marker, but Jeremy
>+		 * well noted that it will cause us locking problems in 32-bit
>+		 * sys, so we have a special version field */
>+		u32 version;
>+	};
>+	char page_align[PAGE_SIZE];
>+};
>+
Why does kvm_hv_clock need page_align?
And also the kvm_hv_clock is alloced with kvm_vcpu,
so the align is not enough, isn't it?
I thik __atribute__((__aligne__(PAGE_SIZE)))) is better than it.

Best Regards,

Akio Takebe

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