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From: Thomas Huth <thuth@redhat.com>
To: Christian Borntraeger <borntraeger@de.ibm.com>,
	Andrew Jones <drjones@redhat.com>
Cc: "Janosch Frank" <frankja@linux.ibm.com>,
	kvm@vger.kernel.org, "Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Shuah Khan" <shuah@kernel.org>,
	"David Hildenbrand" <david@redhat.com>,
	"Cornelia Huck" <cohuck@redhat.com>,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	linux-s390@vger.kernel.org
Subject: Re: [PATCH 5/9] KVM: selftests: Align memory region addresses to 1M on s390x
Date: Fri, 24 May 2019 20:17:43 +0200	[thread overview]
Message-ID: <54f10713-002b-515c-e40f-5e64996b8f6f@redhat.com> (raw)
In-Reply-To: <7919d65e-d814-9e68-4df0-d12f43f0b984@de.ibm.com>

On 24/05/2019 10.29, Christian Borntraeger wrote:
> 
> 
> On 23.05.19 19:40, Andrew Jones wrote:
>> On Thu, May 23, 2019 at 06:43:05PM +0200, Thomas Huth wrote:
>>> On s390x, there is a constraint that memory regions have to be aligned
>>> to 1M (or running the VM will fail). Introduce a new "alignment" variable
>>> in the vm_userspace_mem_region_add() function which now can be used for
>>> both, huge page and s390x alignment requirements.
>>>
>>> Signed-off-by: Thomas Huth <thuth@redhat.com>
>>> ---
>>>  tools/testing/selftests/kvm/lib/kvm_util.c | 21 ++++++++++++++++-----
>>>  1 file changed, 16 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
>>> index 08edb8436c47..656df9d5cd4d 100644
>>> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
>>> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
>>> @@ -559,6 +559,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
>>>  	unsigned long pmem_size = 0;
>>>  	struct userspace_mem_region *region;
>>>  	size_t huge_page_size = KVM_UTIL_PGS_PER_HUGEPG * vm->page_size;
>>> +	size_t alignment;
>>>  
>>>  	TEST_ASSERT((guest_paddr % vm->page_size) == 0, "Guest physical "
>>>  		"address not on a page boundary.\n"
>>> @@ -608,9 +609,20 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
>>>  	TEST_ASSERT(region != NULL, "Insufficient Memory");
>>>  	region->mmap_size = npages * vm->page_size;
>>>  
>>> -	/* Enough memory to align up to a huge page. */
>>> +#ifdef __s390x__
>>> +	/* On s390x, the host address must be aligned to 1M (due to PGSTEs) */
>>> +	alignment = 0x100000;
>>> +#else
>>> +	alignment = 1;
>>> +#endif
>>> +
>>>  	if (src_type == VM_MEM_SRC_ANONYMOUS_THP)
>>> -		region->mmap_size += huge_page_size;
>>> +		alignment = huge_page_size;
>>
>> I guess s390x won't ever support VM_MEM_SRC_ANONYMOUS_THP? If it does,
>> then we need 'alignment = max(huge_page_size, alignment)'. Actually
>> that might be a nice way to write this anyway for future-proofing.
> 
> I can do 
> -		alignment = huge_page_size;
> +		alignment = max(huge_page_size, alignment);
> 
> when applying.

Yes, please, that's certainly cleaner this way.

 Thanks,
  Thomas

  reply	other threads:[~2019-05-24 18:17 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-23 16:43 [PATCH v1 0/9] KVM selftests for s390x Thomas Huth
2019-05-23 16:43 ` [PATCH 1/9] KVM: selftests: Wrap vcpu_nested_state_get/set functions with x86 guard Thomas Huth
2019-05-23 16:43 ` [PATCH 2/9] KVM: selftests: Guard struct kvm_vcpu_events with __KVM_HAVE_VCPU_EVENTS Thomas Huth
2019-05-23 17:57   ` Andrew Jones
2019-05-23 16:43 ` [PATCH 3/9] kvm: selftests: aarch64: fix default vm mode Thomas Huth
2019-05-24  8:37   ` Christian Borntraeger
2019-05-23 16:43 ` [PATCH 4/9] KVM: selftests: Introduce a VM_MODE_DEFAULT macro for the default bits Thomas Huth
2019-05-23 17:20   ` Andrew Jones
2019-05-23 16:43 ` [PATCH 5/9] KVM: selftests: Align memory region addresses to 1M on s390x Thomas Huth
2019-05-23 17:40   ` Andrew Jones
2019-05-24  8:29     ` Christian Borntraeger
2019-05-24 18:17       ` Thomas Huth [this message]
2019-05-23 16:43 ` [PATCH 6/9] KVM: selftests: Add processor code for s390x Thomas Huth
2019-05-23 16:43 ` [PATCH 7/9] KVM: selftests: Add the sync_regs test " Thomas Huth
2019-05-23 16:43 ` [PATCH 8/9] KVM: s390: Do not report unusabled IDs via KVM_CAP_MAX_VCPU_ID Thomas Huth
2019-05-23 17:56   ` Andrew Jones
2019-05-24  9:13   ` Cornelia Huck
2019-05-24  9:16   ` David Hildenbrand
2019-05-28 11:00   ` Christian Borntraeger
2019-05-28 12:53     ` Cornelia Huck
2019-05-28 13:48       ` Christian Borntraeger
2019-05-23 16:43 ` [PATCH 9/9] KVM: selftests: Move kvm_create_max_vcpus test to generic code Thomas Huth
2019-05-23 17:56   ` Andrew Jones
2019-05-24  9:16   ` David Hildenbrand
2019-05-24 11:11 ` [PATCH v1 0/9] KVM selftests for s390x Christian Borntraeger
2019-05-24 12:17   ` Christian Borntraeger
2019-05-24 12:29     ` Christian Borntraeger
2019-05-24 12:36       ` David Hildenbrand
2019-05-24 12:56         ` Christian Borntraeger
2019-05-24 18:33 ` Christian Borntraeger
2019-06-04 17:19 ` Paolo Bonzini
2019-06-04 17:37   ` Christian Borntraeger

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