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HE1PR0801MB1980; 20:4ZMtZdgHwoL/k89bXvOF5pIKIBiC5boWEMS72IunM/nNfjWFzE8dDuCdHDlfHokOb5eg6lWjXWo3o3Dkfjav1xzIWkGspWBA+eX0kbGq1Evba+cdX4R7IMjl9YZKdt0yEgSAPpeXswLQ+lRJqtBkkj873cR4+N5MkLRmRSgj7qQ= X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Mar 2018 12:58:17.2991 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9c4a5ce9-93d7-43d0-a064-08d590bdbf45 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 0bc7f26d-0264-416e-a6fc-8352af79c58f X-MS-Exchange-Transport-CrossTenantHeadersStamped: HE1PR0801MB1980 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 40.107.2.137 Subject: [Qemu-devel] [PATCH for-2.12 2/2] i386/hyperv: error out if features requested but unsupported X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-stable@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In order to guarantee compatibility on migration, QEMU should have complete control over the features it announces to the guest via CPUID. However, for a number of Hyper-V-related cpu properties, if the corresponding feature is not supported by the underlying KVM, the propery is silently ignored and the feature is not announced to the guest. Refuse to start with an error instead. Cc: qemu-stable@nongnu.org Signed-off-by: Roman Kagan --- target/i386/kvm.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/target/i386/kvm.c b/target/i386/kvm.c index fb20ff18c2..c9c359241c 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -658,17 +658,34 @@ static int hyperv_handle_properties(CPUState *cs) env->features[FEAT_HYPERV_EAX] |=3D HV_ACCESS_FREQUENCY_MSRS; env->features[FEAT_HYPERV_EDX] |=3D HV_FREQUENCY_MSRS_AVAILABLE; } - if (cpu->hyperv_crash && has_msr_hv_crash) { + if (cpu->hyperv_crash) { + if (!has_msr_hv_crash) { + fprintf(stderr, + "Hyper-V crash MSRs are not supported by kernel\n"); + return -ENOSYS; + } env->features[FEAT_HYPERV_EDX] |=3D HV_GUEST_CRASH_MSR_AVAILABLE; } env->features[FEAT_HYPERV_EDX] |=3D HV_CPU_DYNAMIC_PARTITIONING_AVAILA= BLE; - if (cpu->hyperv_reset && has_msr_hv_reset) { + if (cpu->hyperv_reset) { + if (!has_msr_hv_reset) { + fprintf(stderr, "Hyper-V reset MSR is not supported by kernel\= n"); + return -ENOSYS; + } env->features[FEAT_HYPERV_EAX] |=3D HV_RESET_AVAILABLE; } - if (cpu->hyperv_vpindex && has_msr_hv_vpindex) { + if (cpu->hyperv_vpindex) { + if (!has_msr_hv_vpindex) { + fprintf(stderr, "Hyper-V VP_INDEX is not supported by kernel\n= "); + return -ENOSYS; + } env->features[FEAT_HYPERV_EAX] |=3D HV_VP_INDEX_AVAILABLE; } - if (cpu->hyperv_runtime && has_msr_hv_runtime) { + if (cpu->hyperv_runtime) { + if (!has_msr_hv_runtime) { + fprintf(stderr, "Hyper-V VP_INDEX is not supported by kernel\n= "); + return -ENOSYS; + } env->features[FEAT_HYPERV_EAX] |=3D HV_VP_RUNTIME_AVAILABLE; } if (cpu->hyperv_synic) { --=20 2.14.3