Messages in this thread | | | Date | Mon, 31 May 2010 10:49:06 -0300 | From | Glauber Costa <> | Subject | Re: [PATCH] Add Documentation/kvm/msr.txt |
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On Sun, May 30, 2010 at 12:14:21PM +0300, Avi Kivity wrote: > On 05/27/2010 07:02 PM, Glauber Costa wrote: > >> > >>>+ > >>>+Custom MSR list > >>>+-------- > >>>+ > >>>+The current supported Custom MSR list is: > >>>+ > >>>+MSR_KVM_WALL_CLOCK: 0x11 > >>>+ > >>>+ data: physical address of a memory area. > >>Which must be in guest RAM (i.e., don't point it somewhere random > >>and expect the hypervisor to allocate it for you). > >> > >>Must be aligned to 4 bytes (we don't enforce it though). > >I don't see the reason for it. > > Insurance. > > >If this is a requirement, our own implementation > >is failing to meet it. > > How are we failing to meet it? All guests align to at least four bytes. static struct pvclock_wall_clock wall_clock;
Unless there is something that the compiler does that I should take for granted, there is no alignment directive in there, and it could be anywhere.
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