linux-kernel - Re: [PATCH v4 5/6] mips/kvm: Fix ABI by moving manipulation of CP0 registers to KVM_{G,S}ET_ONE

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Date:	Wed, 22 May 2013 10:55:20 -0700
From:	David Daney <ddaney@...iumnetworks.com>
To:	Sanjay Lal <sanjayl@...asys.com>
CC:	David Daney <ddaney.cavm@...il.com>, <linux-mips@...ux-mips.org>,
	<ralf@...ux-mips.org>, <kvm@...r.kernel.org>,
	Gleb Natapov <gleb@...hat.com>, <linux-kernel@...r.kernel.org>,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v4 5/6] mips/kvm: Fix ABI by moving manipulation of CP0
 registers to KVM_{G,S}ET_ONE_REG

On 05/22/2013 10:44 AM, Sanjay Lal wrote:
>
> On May 21, 2013, at 1:54 PM, David Daney wrote:
>
>> From: David Daney <david.daney@...ium.com>
>>
>> Because not all 256 CP0 registers are ever implemented, we need a
>> different method of manipulating them.  Use the
>> KVM_SET_ONE_REG/KVM_GET_ONE_REG mechanism.
>>
>> Code related to implementing KVM_SET_ONE_REG/KVM_GET_ONE_REG is
>> consolidated in to kvm_trap_emul.c, now unused code and definitions
>> are removed.
>>
>> Signed-off-by: David Daney <david.daney@...ium.com>
>> ---
>> arch/mips/include/asm/kvm.h      |  91 +++++++++--
>> arch/mips/include/asm/kvm_host.h |   4 -
>> arch/mips/kvm/kvm_mips.c         |  90 +----------
>> arch/mips/kvm/kvm_trap_emul.c    | 338 ++++++++++++++++++++++++++++++++++-----
>> 4 files changed, 383 insertions(+), 140 deletions(-)
[...]
>>
>
> Most of the functions that have been relocated to kvm_trap_emul.c should stay in kvm_mips.c. They are/will shared between the trap and emulate and VZ modes.  They include kvm_mips_reset_vcpu(), kvm_vcpu_ioctl_interrupt(), kvm_arch_vcpu_ioctl().
>
> kvm_mips_get_reg() and kvm_mips_set_reg() should be in kvm_mips.c as they will be shared by the trap and emulate and VZ code.
>

OK, I will revise the patch set to rearrange things in a manner that 
leaves these in kvm_mips.c.  However, this is of secondary importance to 
the question of the suitability of the ABI.


> If you plan on defining specific versions of these functions for Cavium's implementation of KVM, please make them callbacks.
>

There will soon be follow on patches that do exactly that.



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