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Tue, 15 Feb 2022 12:06:09 +0000 (GMT) Received: from p-imbrenda (unknown [9.145.2.54]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 15 Feb 2022 12:06:08 +0000 (GMT) Date: Tue, 15 Feb 2022 13:06:06 +0100 From: Claudio Imbrenda To: Pierre Morel Cc: linux-s390@vger.kernel.org, frankja@linux.ibm.com, thuth@redhat.com, kvm@vger.kernel.org, cohuck@redhat.com, david@redhat.com, nrb@linux.ibm.com Subject: Re: [kvm-unit-tests PATCH 1/1] s390x: stsi: Define vm_is_kvm to be used in different tests Message-ID: <20220215130606.2d4f2ebb@p-imbrenda> In-Reply-To: <20220215104632.47796-2-pmorel@linux.ibm.com> References: <20220215104632.47796-1-pmorel@linux.ibm.com> <20220215104632.47796-2-pmorel@linux.ibm.com> Organization: IBM X-Mailer: Claws Mail 3.18.0 (GTK+ 2.24.33; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 3o69v8B86CBvMBzeqM6VGW2BVdxpwRbn X-Proofpoint-ORIG-GUID: 3RoebiPN5io9tkvYyxubZmbxt0Bg4dw0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-15_04,2022-02-14_04,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 priorityscore=1501 mlxscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 impostorscore=0 suspectscore=0 mlxlogscore=999 clxscore=1015 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202150069 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Tue, 15 Feb 2022 11:46:32 +0100 Pierre Morel wrote: > Several tests are in need of a way to check on which hypervisor > and virtualization level they are running on to be able to fence > certain tests. This patch adds functions that return true if a > vm is running under KVM, LPAR or generally as a level 2 guest. > > To check if we're running under KVM we use the STSI 3.2.2 > instruction, let's define it's response structure in a central > header. > sorry, I had replied to the old series, let me reply here too I think it would look cleaner if there was only one "detect_environment" function, that would call stsi once and detect the environment, then the various vm_is_* would become something like bool vm_is_*(void) { return detect_environment() == VM_IS_*; } of course detect_environment would also cache the result with static variables. bonus, we could make that function public, so a testcase could just switch over the type of hypervisor it's being run on, instead of having to use a series of ifs. and then maybe the various vm_is_* could become static inlines to be put in the header. please note that "detect_environment" is just the first thing that came to my mind, I have no preference regarding the name. > Signed-off-by: Pierre Morel > --- > lib/s390x/stsi.h | 32 ++++++++++++++++++++++++++++ > lib/s390x/vm.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++-- > lib/s390x/vm.h | 3 +++ > s390x/stsi.c | 23 ++------------------ > 4 files changed, 90 insertions(+), 23 deletions(-) > create mode 100644 lib/s390x/stsi.h > > diff --git a/lib/s390x/stsi.h b/lib/s390x/stsi.h > new file mode 100644 > index 00000000..bebc492d > --- /dev/null > +++ b/lib/s390x/stsi.h > @@ -0,0 +1,32 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Structures used to Store System Information > + * > + * Copyright IBM Corp. 2022 > + */ > + > +#ifndef _S390X_STSI_H_ > +#define _S390X_STSI_H_ > + > +struct sysinfo_3_2_2 { > + uint8_t reserved[31]; > + uint8_t count; > + struct { > + uint8_t reserved2[4]; > + uint16_t total_cpus; > + uint16_t conf_cpus; > + uint16_t standby_cpus; > + uint16_t reserved_cpus; > + uint8_t name[8]; > + uint32_t caf; > + uint8_t cpi[16]; > + uint8_t reserved5[3]; > + uint8_t ext_name_encoding; > + uint32_t reserved3; > + uint8_t uuid[16]; > + } vm[8]; > + uint8_t reserved4[1504]; > + uint8_t ext_names[8][256]; > +}; > + > +#endif /* _S390X_STSI_H_ */ > diff --git a/lib/s390x/vm.c b/lib/s390x/vm.c > index a5b92863..91acd05b 100644 > --- a/lib/s390x/vm.c > +++ b/lib/s390x/vm.c > @@ -12,6 +12,7 @@ > #include > #include > #include "vm.h" > +#include "stsi.h" > > /** > * Detect whether we are running with TCG (instead of KVM) > @@ -26,9 +27,13 @@ bool vm_is_tcg(void) > if (initialized) > return is_tcg; > > + if (!vm_is_vm()) { > + initialized = true; > + return is_tcg; > + } > + > buf = alloc_page(); > - if (!buf) > - return false; > + assert(buf); > > if (stsi(buf, 1, 1, 1)) > goto out; > @@ -43,3 +48,49 @@ out: > free_page(buf); > return is_tcg; > } > + > +/** > + * Detect whether we are running with KVM > + */ > +bool vm_is_kvm(void) > +{ > + /* EBCDIC for "KVM/" */ > + const uint8_t kvm_ebcdic[] = { 0xd2, 0xe5, 0xd4, 0x61 }; > + static bool initialized; > + static bool is_kvm; > + struct sysinfo_3_2_2 *stsi_322; > + > + if (initialized) > + return is_kvm; > + > + if (!vm_is_vm() || vm_is_tcg()) { > + initialized = true; > + return is_kvm; > + } > + > + stsi_322 = alloc_page(); > + assert(stsi_322); > + > + if (stsi(stsi_322, 3, 2, 2)) > + goto out; > + > + /* > + * If the manufacturer string is "KVM/" in EBCDIC, then we > + * are on KVM. > + */ > + is_kvm = !memcmp(&stsi_322->vm[0].cpi, kvm_ebcdic, sizeof(kvm_ebcdic)); > + initialized = true; > +out: > + free_page(stsi_322); > + return is_kvm; > +} > + > +bool vm_is_lpar(void) > +{ > + return stsi_get_fc() == 2; > +} > + > +bool vm_is_vm(void) > +{ > + return stsi_get_fc() == 3; > +} > diff --git a/lib/s390x/vm.h b/lib/s390x/vm.h > index 7abba0cc..3aaf76af 100644 > --- a/lib/s390x/vm.h > +++ b/lib/s390x/vm.h > @@ -9,5 +9,8 @@ > #define _S390X_VM_H_ > > bool vm_is_tcg(void); > +bool vm_is_kvm(void); > +bool vm_is_vm(void); > +bool vm_is_lpar(void); > > #endif /* _S390X_VM_H_ */ > diff --git a/s390x/stsi.c b/s390x/stsi.c > index 391f8849..dccc53e7 100644 > --- a/s390x/stsi.c > +++ b/s390x/stsi.c > @@ -13,27 +13,8 @@ > #include > #include > #include > +#include > > -struct stsi_322 { > - uint8_t reserved[31]; > - uint8_t count; > - struct { > - uint8_t reserved2[4]; > - uint16_t total_cpus; > - uint16_t conf_cpus; > - uint16_t standby_cpus; > - uint16_t reserved_cpus; > - uint8_t name[8]; > - uint32_t caf; > - uint8_t cpi[16]; > - uint8_t reserved5[3]; > - uint8_t ext_name_encoding; > - uint32_t reserved3; > - uint8_t uuid[16]; > - } vm[8]; > - uint8_t reserved4[1504]; > - uint8_t ext_names[8][256]; > -}; > static uint8_t pagebuf[PAGE_SIZE * 2] __attribute__((aligned(PAGE_SIZE * 2))); > > static void test_specs(void) > @@ -91,7 +72,7 @@ static void test_3_2_2(void) > /* EBCDIC for "KVM/" */ > const uint8_t cpi_kvm[] = { 0xd2, 0xe5, 0xd4, 0x61 }; > const char vm_name_ext[] = "kvm-unit-test"; > - struct stsi_322 *data = (void *)pagebuf; > + struct sysinfo_3_2_2 *data = (void *)pagebuf; > > report_prefix_push("3.2.2"); >