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Thu, 2 Mar 2017 15:17:00 +0000 Subject: [RFC PATCH v2 22/32] kvm: svm: prepare to reserve asid for SEV guest From: Brijesh Singh To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Date: Thu, 2 Mar 2017 10:16:56 -0500 Message-ID: <148846781666.2349.1816322796563357670.stgit@brijesh-build-machine> In-Reply-To: <148846752022.2349.13667498174822419498.stgit@brijesh-build-machine> References: <148846752022.2349.13667498174822419498.stgit@brijesh-build-machine> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-Originating-IP: [165.204.77.1] X-ClientProxiedBy: BN6PR03CA0034.namprd03.prod.outlook.com (10.175.124.20) To CY4PR12MB1608.namprd12.prod.outlook.com (10.172.72.17) X-MS-Office365-Filtering-Correlation-Id: 43c22158-3d77-4881-d90c-08d4617f2ff3 X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam: UriScan:; BCL:0; PCL:0; RULEID:(22001)(48565401081); SRVR:CY4PR12MB1608; X-Microsoft-Exchange-Diagnostics: 1; CY4PR12MB1608; 3:9E7F4ODygucmgfQN44q0gFLhu+Cmqrtp0Qw+lGOE8Q/3alMPhD48Brs0BpNoyFfu9RVw3YY7M9OhcRMGrAW5D1cAPgMt0S7ccxXSH6rMe7xvi7M22l173uagpI8WNukmQVKlxKA4sCldmJp2MZXDlcgsBsaZqws06AJ8UyB00DlfvIsJhvCO47eiu1r/XXXiJVoRUHfXqzaOR1ONVtA9/kp35Nxohv1g13DueQ1I5RHCLo2bDeLiRHFlf/ybJSfPTL24lDP4hT5dxe74LDliGbDDbd5r9E4fkuz8FixAZN4=; 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20:OpSsd4kOvdWUxBr02H6ugBno9IYn6AY/vilsVRKkR7gDnWaL2p43gCH5WIFCny77Ff1kU//GQXYbe44WaiK1OwpTEwmbzfqn74YKT82zzGMcWG0MzyJ6t7nzLg5ebjVx+2UsX6fI8lyWUJLO44rr4FnHVh8WvvHP1atVXH9XsuQMth2SixHR1Z4o23T+hKgdlwzY90jBWuuFRMD4yffp+zw1KvCSi1UB+ImSaIIcblx2TYQJDZeuAy9hFMnK1pSh X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Mar 2017 15:17:00.4801 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY4PR12MB1608 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP In current implementation, asid allocation starts from 1, this patch adds a min_asid variable in svm_vcpu structure to allow starting asid from something other than 1. Signed-off-by: Brijesh Singh Reviewed-by: Paolo Bonzini --- arch/x86/kvm/svm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index b581499..8d8fe62 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -507,6 +507,7 @@ struct svm_cpu_data { u64 asid_generation; u32 max_asid; u32 next_asid; + u32 min_asid; struct kvm_ldttss_desc *tss_desc; struct page *save_area; @@ -763,6 +764,7 @@ static int svm_hardware_enable(void) sd->asid_generation = 1; sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1; sd->next_asid = sd->max_asid + 1; + sd->min_asid = 1; native_store_gdt(&gdt_descr); gdt = (struct desc_struct *)gdt_descr.address; @@ -2026,7 +2028,7 @@ static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd) { if (sd->next_asid > sd->max_asid) { ++sd->asid_generation; - sd->next_asid = 1; + sd->next_asid = sd->min_asid; svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID; }