Re: [PATCH v5 03/12] KVM: introduce gfn_to_pfn_memslot_atomic

[Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>]

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@linux.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.