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| author | David Hildenbrand <dahi@linux.vnet.ibm.com> | 2015-10-29 10:30:36 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2016-06-21 09:43:46 +0200 |
| commit | 91473b487dd58af6384c5c3db13de50defa2c106 (patch) | |
| tree | da99d623f00f1786619141a2e82b48b182187c18 /arch/s390/kvm/vsie.c | |
| parent | KVM: s390: vsie: speed up VCPU external calls (diff) | |
| download | linux-91473b487dd58af6384c5c3db13de50defa2c106.tar.xz linux-91473b487dd58af6384c5c3db13de50defa2c106.zip | |
KVM: s390: vsie: correctly set and handle guest TOD
Guest 2 sets up the epoch of guest 3 from his point of view. Therefore,
we have to add the guest 2 epoch to the guest 3 epoch. We also have to take
care of guest 2 epoch changes on STP syncs. This will work just fine by
also updating the guest 3 epoch when a vsie_block has been set for a VCPU.
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/vsie.c')
| -rw-r--r-- | arch/s390/kvm/vsie.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 90781ba52803..6895e7b3be12 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -843,12 +843,21 @@ static int acquire_gmap_shadow(struct kvm_vcpu *vcpu, static void register_shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { + struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; + WRITE_ONCE(vcpu->arch.vsie_block, &vsie_page->scb_s); /* * External calls have to lead to a kick of the vcpu and * therefore the vsie -> Simulate Wait state. */ atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags); + /* + * We have to adjust the g3 epoch by the g2 epoch. The epoch will + * automatically be adjusted on tod clock changes via kvm_sync_clock. + */ + preempt_disable(); + scb_s->epoch += vcpu->kvm->arch.epoch; + preempt_enable(); } /* |