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Message-ID: <20140516164645.57f22213@bee>
Date: Fri, 16 May 2014 16:46:45 +0200
From: Michael Mueller <mimu@...ux.vnet.ibm.com>
To: Alexander Graf <agraf@...e.de>
Cc: qemu-devel@...gnu.org, kvm@...r.kernel.org,
linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
Gleb Natapov <gleb@...nel.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 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?
>
> Alex
>
>
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