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Date: Fri, 16 May 2014 22:35:34 +0200
From: Alexander Graf <agraf@...e.de>
To: Michael Mueller <mimu@...ux.vnet.ibm.com>
CC: linux-s390@...r.kernel.org, kvm@...r.kernel.org,
Gleb Natapov <gleb@...nel.org>, qemu-devel@...gnu.org,
linux-kernel@...r.kernel.org,
Christian Borntraeger <borntraeger@...ibm.com>,
"Jason J. Herne" <jjherne@...ux.vnet.ibm.com>,
Cornelia Huck <cornelia.huck@...ibm.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Andreas Faerber <afaerber@...e.de>,
Richard Henderson <rth@...ddle.net>
Subject: Re: [Qemu-devel] [PATCH v1 RFC 3/6] KVM: s390: use facilities and
cpu_id per KVM
On 16.05.14 18:09, Michael Mueller wrote:
> On Fri, 16 May 2014 16:49:37 +0200
> Alexander Graf <agraf@...e.de> wrote:
>
>> On 16.05.14 16:46, Michael Mueller wrote:
>>> On Fri, 16 May 2014 13:55:41 +0200
>>> Alexander Graf <agraf@...e.de> wrote:
>>>
>>>> On 13.05.14 16:58, Michael Mueller wrote:
>>>>> The patch introduces facilities and cpu_ids per virtual machine.
>>>>> Different virtual machines may want to expose different facilities and
>>>>> cpu ids to the guest, so let's make them per-vm instead of global.
>>>>>
>>>>> In addition this patch renames all ocurrences of *facilities to *fac_list
>>>>> smilar to the already exiting symbol stfl_fac_list in lowcore.
>>>>>
>>>>> Signed-off-by: Michael Mueller <mimu@...ux.vnet.ibm.com>
>>>>> Acked-by: Cornelia Huck <cornelia.huck@...ibm.com>
>>>>> Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com>
>>>>> ---
>>>>> arch/s390/include/asm/kvm_host.h | 7 +++
>>>>> arch/s390/kvm/gaccess.c | 4 +-
>>>>> arch/s390/kvm/kvm-s390.c | 107 +++++++++++++++++++++++++++------------
>>>>> arch/s390/kvm/kvm-s390.h | 23 +++++++--
>>>>> arch/s390/kvm/priv.c | 13 +++--
>>>>> 5 files changed, 113 insertions(+), 41 deletions(-)
>>>>>
>>>>> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
>>>>> index 38d487a..b4751ba 100644
>>>>> --- a/arch/s390/include/asm/kvm_host.h
>>>>> +++ b/arch/s390/include/asm/kvm_host.h
>>>>> @@ -414,6 +414,12 @@ struct kvm_s390_config {
>>>>> struct kvm_s390_attr_name name;
>>>>> };
>>>>>
>>>>> +struct kvm_s390_cpu_model {
>>>>> + unsigned long *sie_fac;
>>>>> + struct cpuid cpu_id;
>>>>> + unsigned long *fac_list;
>>>>> +};
>>>>> +
>>>>> struct kvm_arch{
>>>>> struct sca_block *sca;
>>>>> debug_info_t *dbf;
>>>>> @@ -427,6 +433,7 @@ struct kvm_arch{
>>>>> wait_queue_head_t ipte_wq;
>>>>> struct kvm_s390_config *cfg;
>>>>> spinlock_t start_stop_lock;
>>>>> + struct kvm_s390_cpu_model model;
>>>>> };
>>>>>
>>>>> #define KVM_HVA_ERR_BAD (-1UL)
>>>>> diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
>>>>> index db608c3..4c7ca40 100644
>>>>> --- a/arch/s390/kvm/gaccess.c
>>>>> +++ b/arch/s390/kvm/gaccess.c
>>>>> @@ -358,8 +358,8 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned
>>>>> long gva, union asce asce;
>>>>>
>>>>> ctlreg0.val = vcpu->arch.sie_block->gcr[0];
>>>>> - edat1 = ctlreg0.edat && test_vfacility(8);
>>>>> - edat2 = edat1 && test_vfacility(78);
>>>>> + edat1 = ctlreg0.edat && test_kvm_facility(vcpu->kvm, 8);
>>>>> + edat2 = edat1 && test_kvm_facility(vcpu->kvm, 78);
>>>>> asce.val = get_vcpu_asce(vcpu);
>>>>> if (asce.r)
>>>>> goto real_address;
>>>>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>>>>> index 01a5212..a53652f 100644
>>>>> --- a/arch/s390/kvm/kvm-s390.c
>>>>> +++ b/arch/s390/kvm/kvm-s390.c
>>>>> @@ -1,5 +1,5 @@
>>>>> /*
>>>>> - * hosting zSeries kernel virtual machines
>>>>> + * Hosting zSeries kernel virtual machines
>>>>> *
>>>>> * Copyright IBM Corp. 2008, 2009
>>>>> *
>>>>> @@ -30,7 +30,6 @@
>>>>> #include <asm/pgtable.h>
>>>>> #include <asm/nmi.h>
>>>>> #include <asm/switch_to.h>
>>>>> -#include <asm/facility.h>
>>>>> #include <asm/sclp.h>
>>>>> #include<asm/timex.h>
>>>>> #include "kvm-s390.h"
>>>>> @@ -92,15 +91,33 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
>>>>> { NULL }
>>>>> };
>>>>>
>>>>> -unsigned long *vfacilities;
>>>>> -static struct gmap_notifier gmap_notifier;
>>>>> +/* upper facilities limit for kvm */
>>>>> +unsigned long kvm_s390_fac_list_mask[] = {
>>>>> + 0xff82fff3f47c2000UL,
>>>>> + 0x005c000000000000UL,
>>>>> +};
>>>>> +
>>>>> +unsigned long kvm_s390_fac_list_mask_size(void)
>>>>> +{
>>>>> + BUILD_BUG_ON(ARRAY_SIZE(kvm_s390_fac_list_mask) >
>>>>> + S390_ARCH_FAC_MASK_SIZE_U64);
>>>>> + return ARRAY_SIZE(kvm_s390_fac_list_mask);
>>>>> +}
>>>>>
>>>>> -/* test availability of vfacility */
>>>>> -int test_vfacility(unsigned long nr)
>>>>> +void kvm_s390_apply_fac_list_mask(unsigned long fac_list[])
>>>>> {
>>>>> - return __test_facility(nr, (void *) vfacilities);
>>>>> + unsigned int i;
>>>>> +
>>>>> + for (i = 0; i < S390_ARCH_FAC_LIST_SIZE_U64; i++) {
>>>>> + if (i < kvm_s390_fac_list_mask_size())
>>>>> + fac_list[i] &= kvm_s390_fac_list_mask[i];
>>>>> + else
>>>>> + fac_list[i] &= 0UL;
>>>>> + }
>>>>> }
>>>>>
>>>>> +static struct gmap_notifier gmap_notifier;
>>>>> +
>>>>> /* Section: not file related */
>>>>> int kvm_arch_hardware_enable(void *garbage)
>>>>> {
>>>>> @@ -485,6 +502,30 @@ long kvm_arch_vm_ioctl(struct file *filp,
>>>>> return r;
>>>>> }
>>>>>
>>>>> +/* make sure the memory used for fac_list is zeroed */
>>>>> +void kvm_s390_get_hard_fac_list(unsigned long *fac_list, int size)
>>>> Hard? Wouldn't "host" make more sense here?
>>> Renaming "*hard_fac_list" with "*host_fac_list" here and wherever it appears is ok with me.
>>>
>>>> I also think it makes sense to expose the native host facility list to
>>>> user space via an ioctl somehow.
>>>>
>>> In which situation do you need the full facility list. Do you have an example?
>> If you want to just implement -cpu host to get the exact feature set
>> that the host gives you, how do you know which set that is?
> During qemu machine initalization I call:
>
> kvm_s390_get_machine_props(&mach);
>
> which returns the following information:
>
> typedef struct S390MachineProps {
> uint64_t cpuid;
> uint32_t ibc_range;
> uint8_t pad[4];
> uint64_t fac_mask[S390_ARCH_FAC_MASK_SIZE_UINT64];
> uint64_t hard_fac_list[S390_ARCH_FAC_LIST_SIZE_UINT64];
> uint64_t soft_fac_list[S390_ARCH_FAC_LIST_SIZE_UINT64];
> } S390MachineProps;
Ah, ok, I missed that part. So "kvm_s390_get_machine_props()" basically
gets us the full facility list the host supports. That makes sense.
I still don't know whether we should care about hard/soft, but I suppose
the rest makes sense.
Alex
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