linux-kernel - Re: [PATCH v5 03/12] KVM: introduce gfn_to_pfn_memslot

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Date:	Fri, 10 Aug 2012 11:22:02 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v5 03/12] KVM: introduce gfn_to_pfn_memslot_atomic

On 08/10/2012 02:50 AM, Marcelo Tosatti wrote:
> On Tue, Aug 07, 2012 at 05:49:36PM +0800, Xiao Guangrong wrote:
>> It can instead of hva_to_pfn_atomic
>>
>> Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
>> ---
>>  arch/x86/kvm/mmu.c       |    5 +----
>>  include/linux/kvm_host.h |    3 ++-
>>  virt/kvm/kvm_main.c      |   14 ++++++++------
>>  3 files changed, 11 insertions(+), 11 deletions(-)
> 
> What if someone needs gfn_to_hva_memslot in the future, which is not
> unlikely?

Marcelo,

We have already had the function gfn_to_hva_memslot in kvm_host.h which
is not directly used on x86. In this patchset, gfn_to_hva_memslot does
not check the slot->flags.

I think we can let it be based on gfn_to_hva_many:
static inline unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
                                               gfn_t gfn)
{
	return gfn_to_hva_many(slot, gfn, true);
}

Then all gfn_to_*() functions are based on gfn_to_hva_many in which we
will check slot->flags properly.

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