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dmarc=none action=none header.from=oracle.com; From: Boris Ostrovsky To: xen-devel@lists.xenproject.org Cc: iwj@xenproject.org, wl@xen.org, anthony.perard@citrix.com, jbeulich@suse.com, andrew.cooper3@citrix.com, roger.pau@citrix.com, jun.nakajima@intel.com, kevin.tian@intel.com, boris.ostrovsky@oracle.com Subject: [PATCH v2 0/4] Permit fault-less access to non-emulated MSRs Date: Wed, 20 Jan 2021 17:49:08 -0500 Message-Id: <1611182952-9941-1-git-send-email-boris.ostrovsky@oracle.com> X-Mailer: git-send-email 1.8.3.1 Content-Type: text/plain X-Originating-IP: [209.17.40.41] X-ClientProxiedBy: BYAPR03CA0002.namprd03.prod.outlook.com (2603:10b6:a02:a8::15) To SA2PR10MB4572.namprd10.prod.outlook.com (2603:10b6:806:f9::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 6fe5557d-a2f3-406d-0f4f-08d8bd959fd1 X-MS-TrafficTypeDiagnostic: SA2PR10MB4441: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2657; 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We can add special handling for this and other RAPL registers (and that's what should happen for pre-4.14 releases) but a more general solution is to provide an option to allow accesses to unhandled registers to proceed. The new option is "ignore_msrs" and it can take three values never: Issue a warning to the log and #GP to the guest. This is default. silent: MSR reads return 0, MSR writes are ignored. No warnings to the log. verbose: Similar to silent but a warning is written. v2: * pass ignore_msrs in msr_policy's value filed, not flags * use 0x400002ff as unhandled MSR * make sure MSR policy is only consulted for guest's MSR acceses Boris Ostrovsky (4): xl: Add support for ignore_msrs option x86: Introduce MSR_UNHANDLED x86: Allow non-faulting accesses to non-emulated MSRs if policy permits this tools/libs: Apply MSR policy to a guest docs/man/xl.cfg.5.pod.in | 20 +++++- tools/include/xenctrl.h | 2 + tools/libs/guest/Makefile | 1 + tools/libs/guest/xg_msrs_x86.c | 110 +++++++++++++++++++++++++++++++++ tools/libs/light/libxl_dom.c | 5 +- tools/libs/light/libxl_internal.h | 2 + tools/libs/light/libxl_types.idl | 7 +++ tools/libs/light/libxl_x86.c | 7 +++ tools/xl/xl_parse.c | 7 +++ xen/arch/x86/hvm/svm/svm.c | 10 ++- xen/arch/x86/hvm/vmx/vmx.c | 10 ++- xen/arch/x86/msr.c | 32 +++++++++- xen/arch/x86/pv/emul-priv-op.c | 10 +-- xen/arch/x86/x86_emulate/x86_emulate.h | 6 ++ xen/include/asm-x86/msr.h | 3 + xen/include/xen/lib/x86/msr.h | 17 ++++- xen/lib/x86/msr.c | 2 + 17 files changed, 229 insertions(+), 22 deletions(-) create mode 100644 tools/libs/guest/xg_msrs_x86.c -- 1.8.3.1