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xen-devel
Re: Hypercall number assignment convension (was Re: [Xen-devel] Re:[PATC
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To: |
"Tian, Kevin" <kevin.tian@xxxxxxxxx> |
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Subject: |
Re: Hypercall number assignment convension (was Re: [Xen-devel] Re:[PATCH]: kexec: framework and i386) |
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From: |
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
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Date: |
Wed, 26 Apr 2006 08:38:18 +0100 |
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Cc: |
xen-devel@xxxxxxxxxxxxxxxxxxx, Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>, Isaku Yamahata <yamahata@xxxxxxxxxxxxx>, Magnus Damm <magnus@xxxxxxxxxxxxx>, Horms <horms@xxxxxxxxxxxx>, Mark Williamson <mark.williamson@xxxxxxxxxxxx> |
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Wed, 26 Apr 2006 00:42:30 -0700 |
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On 26 Apr 2006, at 03:34, Tian, Kevin wrote:
I prefer to the first one. However not the current
__HYPERVISOR_arch_specific_0, *_1, *_2, ..., how about just call
it as __HYPERVISOR_arch_specific_ops which contains another
namespace defined by different architecture seperately?
Sometimes you might want a fast hypercall that doesn't have two levels
of demultiplexing, or where the register/stack parameters are carefully
crafted and would not fit with an ioctl()-style hypercall (see x86's
IRET hypercall).
How about reserving 8 or 16 arch-specific hypercalls up front?
#define __HYPERVISOR_arch_0 32
...
#define __HYPERVISOR_arch_7 39
We could give a bit of breathing space to the non-arch range by
starting __HYPERVISOR_arch_* at. e.g., 40 or 48?
-- Keir
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