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Tue, 18 Feb 2020 03:42:58 -0500 X-MC-Unique: N74ggy_uMUKL0MR8JCttgw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0B19F107ACC5; Tue, 18 Feb 2020 08:42:57 +0000 (UTC) Received: from [10.36.116.190] (ovpn-116-190.ams2.redhat.com [10.36.116.190]) by smtp.corp.redhat.com (Postfix) with ESMTP id C88EC8579D; Tue, 18 Feb 2020 08:42:54 +0000 (UTC) Subject: Re: [PATCH v2 26/42] KVM: s390: protvirt: Do only reset registers that are accessible To: Christian Borntraeger , Janosch Frank Cc: KVM , Cornelia Huck , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , linux-s390 , Michael Mueller , Vasily Gorbik , Janosch Frank References: <20200214222658.12946-1-borntraeger@de.ibm.com> <20200214222658.12946-27-borntraeger@de.ibm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200214222658.12946-27-borntraeger@de.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 14.02.20 23:26, Christian Borntraeger wrote: > From: Janosch Frank > > For protected VMs the hypervisor can not access guest breaking event > address, program parameter, bpbc and todpr. Do not reset those fields > as the control block does not provide access to these fields. > > Signed-off-by: Janosch Frank > [borntraeger@de.ibm.com: patch merging, splitting, fixing] > Signed-off-by: Christian Borntraeger > --- > arch/s390/kvm/kvm-s390.c | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c > index d20a7fa9d480..5b551cc73540 100644 > --- a/arch/s390/kvm/kvm-s390.c > +++ b/arch/s390/kvm/kvm-s390.c > @@ -3442,14 +3442,16 @@ static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu) > kvm_s390_set_prefix(vcpu, 0); > kvm_s390_set_cpu_timer(vcpu, 0); > vcpu->arch.sie_block->ckc = 0; > - vcpu->arch.sie_block->todpr = 0; > memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr)); > vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK; > vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK; > vcpu->run->s.regs.fpc = 0; > - vcpu->arch.sie_block->gbea = 1; > - vcpu->arch.sie_block->pp = 0; > - vcpu->arch.sie_block->fpf &= ~FPF_BPBC; > + if (!kvm_s390_pv_handle_cpu(vcpu)) { Shouldn't we instead check if the VM is in PV mode? (with changed lifecycle handling). Easier to understand. (side not: the name kvm_s390_pv_handle_cpu() is very confusing. I'd suggest kvm_s390_pv_cpu_get_handle(). Will reply to the other patch) > + vcpu->arch.sie_block->gbea = 1; > + vcpu->arch.sie_block->pp = 0; > + vcpu->arch.sie_block->fpf &= ~FPF_BPBC; > + vcpu->arch.sie_block->todpr = 0; > + } > } > > static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu) > -- Thanks, David / dhildenb