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Fri, 29 Nov 2019 10:47:27 +0000 (UTC) Received: from [10.36.118.44] (unknown [10.36.118.44]) by smtp.corp.redhat.com (Postfix) with ESMTP id BB3E360BE2; Fri, 29 Nov 2019 10:47:23 +0000 (UTC) Subject: Re: [PATCH v2 08/13] s390x: protvirt: Add new VCPU reset functions To: Janosch Frank , qemu-devel@nongnu.org References: <20191129094809.26684-1-frankja@linux.ibm.com> <20191129094809.26684-9-frankja@linux.ibm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; prefer-encrypt=mutual; keydata= mQINBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABtCREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT6JAj4EEwECACgFAljj9eoCGwMFCQlmAYAGCwkI BwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEE3eEPcA/4Na5IIP/3T/FIQMxIfNzZshIq687qgG 8UbspuE/YSUDdv7r5szYTK6KPTlqN8NAcSfheywbuYD9A4ZeSBWD3/NAVUdrCaRP2IvFyELj xoMvfJccbq45BxzgEspg/bVahNbyuBpLBVjVWwRtFCUEXkyazksSv8pdTMAs9IucChvFmmq3 jJ2vlaz9lYt/lxN246fIVceckPMiUveimngvXZw21VOAhfQ+/sofXF8JCFv2mFcBDoa7eYob s0FLpmqFaeNRHAlzMWgSsP80qx5nWWEvRLdKWi533N2vC/EyunN3HcBwVrXH4hxRBMco3jvM m8VKLKao9wKj82qSivUnkPIwsAGNPdFoPbgghCQiBjBe6A75Z2xHFrzo7t1jg7nQfIyNC7ez MZBJ59sqA9EDMEJPlLNIeJmqslXPjmMFnE7Mby/+335WJYDulsRybN+W5rLT5aMvhC6x6POK z55fMNKrMASCzBJum2Fwjf/VnuGRYkhKCqqZ8gJ3OvmR50tInDV2jZ1DQgc3i550T5JDpToh dPBxZocIhzg+MBSRDXcJmHOx/7nQm3iQ6iLuwmXsRC6f5FbFefk9EjuTKcLMvBsEx+2DEx0E UnmJ4hVg7u1PQ+2Oy+Lh/opK/BDiqlQ8Pz2jiXv5xkECvr/3Sv59hlOCZMOaiLTTjtOIU7Tq 7ut6OL64oAq+uQINBFXLn5EBEADn1959INH2cwYJv0tsxf5MUCghCj/CA/lc/LMthqQ773ga uB9mN+F1rE9cyyXb6jyOGn+GUjMbnq1o121Vm0+neKHUCBtHyseBfDXHA6m4B3mUTWo13nid 0e4AM71r0DS8+KYh6zvweLX/LL5kQS9GQeT+QNroXcC1NzWbitts6TZ+IrPOwT1hfB4WNC+X 2n4AzDqp3+ILiVST2DT4VBc11Gz6jijpC/KI5Al8ZDhRwG47LUiuQmt3yqrmN63V9wzaPhC+ xbwIsNZlLUvuRnmBPkTJwwrFRZvwu5GPHNndBjVpAfaSTOfppyKBTccu2AXJXWAE1Xjh6GOC 8mlFjZwLxWFqdPHR1n2aPVgoiTLk34LR/bXO+e0GpzFXT7enwyvFFFyAS0Nk1q/7EChPcbRb hJqEBpRNZemxmg55zC3GLvgLKd5A09MOM2BrMea+l0FUR+PuTenh2YmnmLRTro6eZ/qYwWkC u8FFIw4pT0OUDMyLgi+GI1aMpVogTZJ70FgV0pUAlpmrzk/bLbRkF3TwgucpyPtcpmQtTkWS gDS50QG9DR/1As3LLLcNkwJBZzBG6PWbvcOyrwMQUF1nl4SSPV0LLH63+BrrHasfJzxKXzqg rW28CTAE2x8qi7e/6M/+XXhrsMYG+uaViM7n2je3qKe7ofum3s4vq7oFCPsOgwARAQABiQIl BBgBAgAPBQJVy5+RAhsMBQkJZgGAAAoJEE3eEPcA/4NagOsP/jPoIBb/iXVbM+fmSHOjEshl KMwEl/m5iLj3iHnHPVLBUWrXPdS7iQijJA/VLxjnFknhaS60hkUNWexDMxVVP/6lbOrs4bDZ NEWDMktAeqJaFtxackPszlcpRVkAs6Msn9tu8hlvB517pyUgvuD7ZS9gGOMmYwFQDyytpepo YApVV00P0u3AaE0Cj/o71STqGJKZxcVhPaZ+LR+UCBZOyKfEyq+ZN311VpOJZ1IvTExf+S/5 lqnciDtbO3I4Wq0ArLX1gs1q1XlXLaVaA3yVqeC8E7kOchDNinD3hJS4OX0e1gdsx/e6COvy qNg5aL5n0Kl4fcVqM0LdIhsubVs4eiNCa5XMSYpXmVi3HAuFyg9dN+x8thSwI836FoMASwOl C7tHsTjnSGufB+D7F7ZBT61BffNBBIm1KdMxcxqLUVXpBQHHlGkbwI+3Ye+nE6HmZH7IwLwV W+Ajl7oYF+jeKaH4DZFtgLYGLtZ1LDwKPjX7VAsa4Yx7S5+EBAaZGxK510MjIx6SGrZWBrrV TEvdV00F2MnQoeXKzD7O4WFbL55hhyGgfWTHwZ457iN9SgYi1JLPqWkZB0JRXIEtjd4JEQcx +8Umfre0Xt4713VxMygW0PnQt5aSQdMD58jHFxTk092mU+yIHj5LeYgvwSgZN4airXk5yRXl SE+xAvmumFBY Organization: Red Hat GmbH Message-ID: Date: Fri, 29 Nov 2019 11:47:22 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.1.1 MIME-Version: 1.0 In-Reply-To: <20191129094809.26684-9-frankja@linux.ibm.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: FAfT8G9ONfC5CEiPhrHDtQ-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: thuth@redhat.com, pmorel@linux.ibm.com, cohuck@redhat.com, borntraeger@de.ibm.com, qemu-s390x@nongnu.org, mihajlov@linux.ibm.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 29.11.19 10:48, Janosch Frank wrote: > CPU resets for protected guests need to be done via Ultravisor > calls. Hence we need a way to issue these calls for each reset. > > As we formerly had only one reset function and it was called for > initial, as well as for the clear reset, we now need a new interface. > > Signed-off-by: Janosch Frank > --- > target/s390x/cpu.c | 14 ++++++++++++-- > target/s390x/kvm-stub.c | 10 +++++++++- > target/s390x/kvm.c | 38 ++++++++++++++++++++++++++++++++------ > target/s390x/kvm_s390x.h | 4 +++- > 4 files changed, 56 insertions(+), 10 deletions(-) > > diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c > index bd39cb54b7..52fefa1586 100644 > --- a/target/s390x/cpu.c > +++ b/target/s390x/cpu.c > @@ -131,8 +131,18 @@ static void s390_cpu_reset(CPUState *s, cpu_reset_type type) > } > > /* Reset state inside the kernel that we cannot access yet from QEMU. */ > - if (kvm_enabled() && type != S390_CPU_RESET_NORMAL) { > - kvm_s390_reset_vcpu(cpu); > + if (kvm_enabled()) { > + switch (type) { > + case S390_CPU_RESET_CLEAR: > + kvm_s390_reset_vcpu_clear(cpu); > + break; > + case S390_CPU_RESET_INITIAL: > + kvm_s390_reset_vcpu_initial(cpu); > + break; > + case S390_CPU_RESET_NORMAL: > + kvm_s390_reset_vcpu_normal(cpu); > + break; > + } I would have assumed you only have to do that for pv? For ordinary guests we can avoid unnecessary ioctls IMHO. > } > } > > diff --git a/target/s390x/kvm-stub.c b/target/s390x/kvm-stub.c > index 5152e2bdf1..c4cd497f85 100644 > --- a/target/s390x/kvm-stub.c > +++ b/target/s390x/kvm-stub.c > @@ -83,7 +83,15 @@ void kvm_s390_cmma_reset(void) > { > } > > -void kvm_s390_reset_vcpu(S390CPU *cpu) > +void kvm_s390_reset_vcpu_initial(S390CPU *cpu) > +{ > +} > + > +void kvm_s390_reset_vcpu_clear(S390CPU *cpu) > +{ > +} > + > +void kvm_s390_reset_vcpu_normal(S390CPU *cpu) > { > } > > diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c > index b802d02ff5..5b1ed3acb4 100644 > --- a/target/s390x/kvm.c > +++ b/target/s390x/kvm.c > @@ -154,6 +154,7 @@ static int cap_ri; > static int cap_gs; > static int cap_hpage_1m; > static int cap_protvirt; > +static int cap_vcpu_resets; > > static int active_cmma; > > @@ -346,6 +347,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s) > cap_mem_op = kvm_check_extension(s, KVM_CAP_S390_MEM_OP); > cap_s390_irq = kvm_check_extension(s, KVM_CAP_S390_INJECT_IRQ); > cap_protvirt = kvm_check_extension(s, KVM_CAP_S390_PROTECTED); > + cap_vcpu_resets = kvm_check_extension(s, KVM_CAP_S390_VCPU_RESETS); > > if (!kvm_check_extension(s, KVM_CAP_S390_GMAP) > || !kvm_check_extension(s, KVM_CAP_S390_COW)) { > @@ -407,20 +409,44 @@ int kvm_arch_destroy_vcpu(CPUState *cs) > return 0; > } > > -void kvm_s390_reset_vcpu(S390CPU *cpu) > +static void kvm_s390_reset_vcpu(S390CPU *cpu, unsigned long type) > { > CPUState *cs = CPU(cpu); > > - /* The initial reset call is needed here to reset in-kernel > - * vcpu data that we can't access directly from QEMU > - * (i.e. with older kernels which don't support sync_regs/ONE_REG). > - * Before this ioctl cpu_synchronize_state() is called in common kvm > - * code (kvm-all) */ > + /* > + * The reset call is needed here to reset in-kernel vcpu data that > + * we can't access directly from QEMU (i.e. with older kernels > + * which don't support sync_regs/ONE_REG). Before this ioctl > + * cpu_synchronize_state() is called in common kvm code > + * (kvm-all). > + */ > + if (cap_vcpu_resets) { > + if (kvm_vcpu_ioctl(cs, KVM_S390_VCPU_RESET, type)) { > + error_report("CPU reset type %ld failed on CPU %i", > + type, cs->cpu_index); > + } > + return;> + } This is broken for S390_CPU_RESET_NORMAL where we don't do a KVM_S390_INITIAL_RESET for !pv ... Can't we limit that new handling to pv only and keep it out of this path? [...] -- Thanks, David / dhildenb