On 06/09/2014 10:49 AM, Christoffer Dall wrote:
> On Mon, Jun 09, 2014 at 10:06:29AM -0700, Mario Smarduch wrote:
>> On 06/08/2014 05:05 AM, Christoffer Dall wrote:
>>> On Tue, Jun 03, 2014 at 04:19:24PM -0700, Mario Smarduch wrote:
>>>> Patch adds HYP interface for global VM TLB invalidation without address
>>>> parameter. Added ARM version of kvm_flush_remote_tlbs(), made the generic
>>>> implementation a weak symbol.
>>>>
>>>> Signed-off-by: Mario Smarduch <m.smarduch@xxxxxxxxxxx>
>>>> ---
>>>> arch/arm/include/asm/kvm_asm.h | 1 +
>>>> arch/arm/kvm/interrupts.S | 11 +++++++++++
>>>> arch/arm/kvm/mmu.c | 14 ++++++++++++++
>>>> virt/kvm/kvm_main.c | 2 +-
>>>> 4 files changed, 27 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/arch/arm/include/asm/kvm_asm.h b/arch/arm/include/asm/kvm_asm.h
>>>> index 53b3c4a..21bc519 100644
>>>> --- a/arch/arm/include/asm/kvm_asm.h
>>>> +++ b/arch/arm/include/asm/kvm_asm.h
>>>> @@ -78,6 +78,7 @@ extern char __kvm_hyp_code_end[];
>>>>
>>>> extern void __kvm_flush_vm_context(void);
>>>> extern void __kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa);
>>>> +extern void __kvm_tlb_flush_vmid(struct kvm *kvm);
>>>>
>>>> extern int __kvm_vcpu_run(struct kvm_vcpu *vcpu);
>>>> #endif
>>>> diff --git a/arch/arm/kvm/interrupts.S b/arch/arm/kvm/interrupts.S
>>>> index 0d68d40..bddc66b 100644
>>>> --- a/arch/arm/kvm/interrupts.S
>>>> +++ b/arch/arm/kvm/interrupts.S
>>>> @@ -66,6 +66,17 @@ ENTRY(__kvm_tlb_flush_vmid_ipa)
>>>> bx lr
>>>> ENDPROC(__kvm_tlb_flush_vmid_ipa)
>>>>
>>>> +/**
>>>> + * void __kvm_tlb_flush_vmid(struct kvm *kvm) - Flush per-VMID TLBs
>>>> + *
>>>> + * Reuses __kvm_tlb_flush_vmid_ipa() for ARMv7, without passing address
>>>> + * parameter
>>>> + */
>>>> +
>>>> +ENTRY(__kvm_tlb_flush_vmid)
>>>> + b __kvm_tlb_flush_vmid_ipa
>>>> +ENDPROC(__kvm_tlb_flush_vmid)
>>>> +
>>>> /********************************************************************
>>>> * Flush TLBs and instruction caches of all CPUs inside the inner-shareable
>>>> * domain, for all VMIDs
>>>> diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
>>>> index 2ac9588..ef29540 100644
>>>> --- a/arch/arm/kvm/mmu.c
>>>> +++ b/arch/arm/kvm/mmu.c
>>>> @@ -56,6 +56,20 @@ static void kvm_tlb_flush_vmid_ipa(struct kvm *kvm, phys_addr_t ipa)
>>>> kvm_call_hyp(__kvm_tlb_flush_vmid_ipa, kvm, ipa);
>>>> }
>>>>
>>>> +/**
>>>> + * kvm_flush_remote_tlbs() - flush all VM TLB entries
>>>> + * @kvm: pointer to kvm structure.
>>>> + *
>>>> + * Interface to HYP function to flush all VM TLB entries without address
>>>> + * parameter. In HYP mode reuses __kvm_tlb_flush_vmid_ipa() function used by
>>>> + * kvm_tlb_flush_vmid_ipa().
>>>> + */
>>>> +void kvm_flush_remote_tlbs(struct kvm *kvm)
>>>> +{
>>>> + if (kvm)
>>>> + kvm_call_hyp(__kvm_tlb_flush_vmid, kvm);
>>>> +}
>>>> +
>>>> static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
>>>> int min, int max)
>>>> {
>>>> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
>>>> index fa70c6e..ba25765 100644
>>>> --- a/virt/kvm/kvm_main.c
>>>> +++ b/virt/kvm/kvm_main.c
>>>> @@ -184,7 +184,7 @@ static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
>>>> return called;
>>>> }
>>>>
>>>> -void kvm_flush_remote_tlbs(struct kvm *kvm)
>>>> +void __weak kvm_flush_remote_tlbs(struct kvm *kvm)
>>>> {
>>>> long dirty_count = kvm->tlbs_dirty;
>>>>
>>>> --
>>>> 1.7.9.5
>>>>
>>>
>>> This doesn't build or link on aarch64 :(
>>>
>>> -Christoffer
>>>
>>
>> I'll recompile and retest the dirty page logging portion on ARMv8 and
>> resolve these issues, early next week.
>>
>> In the meantime if it's ok with you, I'' move forward with the
>> rest of the patches on ARMv7 to get through critical issues.
>>
>> Would that work?
>
> Your patches need to at least compile with other architectures, I
> suggest fixing that up front. You also eventually need to somehow test
> (or ask maintainers to test) a branch with your patches on the
> architectures that your code messes with. This later point can be
> addressed once we're close to a consensus on ARM.
Ok got it. So far I just checked to make sure x86 compiles since
one function is generic and declared __weak, both x86 and ARM
share it now (Xiaos comment).
>
> -Christoffer
>
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