On 06/11/2018 02:02 PM, Luiz Capitulino wrote:
> On Mon, 11 Jun 2018 11:18:56 -0400
> nilal@xxxxxxxxxx wrote:
>
>> From: Nitesh Narayan Lal <nilal@xxxxxxxxxx>
>>
>> This patch includes the following:
>> 1. Basic skeleton for the support
>> 2. Enablement of x86 platform to use the same
>>
>> Signed-off-by: Nitesh Narayan Lal <nilal@xxxxxxxxxx>
>> ---
>> arch/x86/Kbuild | 2 +-
>> arch/x86/kvm/Kconfig | 6 ++++++
>> arch/x86/kvm/Makefile | 2 ++
>> include/linux/gfp.h | 7 +++++++
>> 4 files changed, 16 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/Kbuild b/arch/x86/Kbuild
>> index 0038a2d..7d39d7d 100644
>> --- a/arch/x86/Kbuild
>> +++ b/arch/x86/Kbuild
>> @@ -2,7 +2,7 @@ obj-y += entry/
>>
>> obj-$(CONFIG_PERF_EVENTS) += events/
>>
>> -obj-$(CONFIG_KVM) += kvm/
>> +obj-$(subst m,y,$(CONFIG_KVM)) += kvm/
>>
>> # Xen paravirtualization support
>> obj-$(CONFIG_XEN) += xen/
>> diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
>> index 92fd433..e8b1291 100644
>> --- a/arch/x86/kvm/Kconfig
>> +++ b/arch/x86/kvm/Kconfig
>> @@ -96,6 +96,12 @@ config KVM_MMU_AUDIT
>> This option adds a R/W kVM module parameter 'mmu_audit', which allows
>> auditing of KVM MMU events at runtime.
>>
>> +config KVM_FREE_PAGE_HINTING
>> + def_bool y
>> + depends on KVM
>> + select VIRTIO
>> + select VIRTIO_BALLOON
> I think it's a good practice to write the help text explaining what
> the feature does and when to disable it.
Thanks, I will add a description for this in my next patch-set.
>
>> +
>> # OK, it's a little counter-intuitive to do this, but it puts it neatly under
>> # the virtualization menu.
>> source drivers/vhost/Kconfig
>> diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
>> index dc4f2fd..866dd56 100644
>> --- a/arch/x86/kvm/Makefile
>> +++ b/arch/x86/kvm/Makefile
>> @@ -16,6 +16,8 @@ kvm-y += x86.o mmu.o emulate.o i8259.o irq.o lapic.o \
>> i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
>> hyperv.o page_track.o debugfs.o
>>
>> +obj-$(CONFIG_KVM_FREE_PAGE_HINTING) += $(KVM)/page_hinting.o
>> +
>> kvm-intel-y += vmx.o pmu_intel.o
>> kvm-amd-y += svm.o pmu_amd.o
>>
>> diff --git a/include/linux/gfp.h b/include/linux/gfp.h
>> index a6afcec..72cd41b 100644
>> --- a/include/linux/gfp.h
>> +++ b/include/linux/gfp.h
>> @@ -439,6 +439,13 @@ static inline struct zonelist *node_zonelist(int nid, gfp_t flags)
>> return NODE_DATA(nid)->node_zonelists + gfp_zonelist(flags);
>> }
>>
>> +#ifdef CONFIG_KVM_FREE_PAGE_HINTING
>> +#define HAVE_ARCH_ALLOC_PAGE
>> +#define HAVE_ARCH_FREE_PAGE
>> +void arch_free_page(struct page *page, int order);
>> +void arch_alloc_page(struct page *page, int order);
>> +#endif
>> +
>> #ifndef HAVE_ARCH_FREE_PAGE
>> static inline void arch_free_page(struct page *page, int order) { }
>> #endif
--
Regards
Nitesh
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