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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: sUJ1ulwxFIqpv8-UucT-ugZ_0aH0P06n X-Proofpoint-GUID: K5RP1WTGLiJyU0f6RvAsaakTZUuoK__s X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-07-24_13,2024-07-24_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 clxscore=1015 impostorscore=0 suspectscore=0 mlxscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 phishscore=0 mlxlogscore=999 lowpriorityscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2407110000 definitions=main-2407240109 On 7/23/24 11:31, Christoph Schlameuss wrote: > Add test suite to validate the s390x architecture specific ucontrol KVM > interface. > > Make use of the selftest test harness. > > * uc_cap_hpage testcase verifies that a ucontrol VM cannot be run with > hugepages. > > To allow testing of the ucontrol interface the kernel needs a > non-default config containing CONFIG_KVM_S390_UCONTROL. > This config needs to be set to built-in (y) as this cannot be built as > module. > > Signed-off-by: Christoph Schlameuss > Reviewed-by: Claudio Imbrenda > --- [...] > +#include "kselftest_harness.h" > +#include "kvm_util.h" > + > +#include > +#include > + > +#define SYS_ADMIN_CAP 0x200000 This looked suspicious to me. Surely this would be available in some form in capability.h since CAP_SYS_ADMIN is something that's regularly checked. [...] > + > +/* so directly declare capget to check caps without libcap */ > +int capget(cap_user_header_t header, cap_user_data_t data); > + > +/** > + * In order to create user controlled virtual machines on S390, > + * check KVM_CAP_S390_UCONTROL and use the flag KVM_VM_S390_UCONTROL > + * as privileged user (SYS_ADMIN). > + */ > +void require_ucontrol_admin(void) > +{ > + struct __user_cap_data_struct data[_LINUX_CAPABILITY_U32S_3]; > + struct __user_cap_header_struct hdr = { > + .version = _LINUX_CAPABILITY_VERSION_3, > + }; > + int rc; > + > + rc = capget(&hdr, data); > + TEST_ASSERT_EQ(0, rc); > + TEST_REQUIRE((data->effective & SYS_ADMIN_CAP) > 0); And in fact capability.h does have defines which hide the magic constant: data->effective & CAP_TO_MASK(CAP_SYS_ADMIN) > + > + TEST_REQUIRE(kvm_has_cap(KVM_CAP_S390_UCONTROL)); > +} > +