From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brijesh Singh Subject: [RFC Part2 PATCH v3 04/26] KVM: SVM: Prepare to reserve asid for SEV guest Date: Mon, 24 Jul 2017 15:02:41 -0500 Message-ID: <20170724200303.12197-5-brijesh.singh@amd.com> References: <20170724200303.12197-1-brijesh.singh@amd.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Thomas Gleixner , Borislav Petkov , Joerg Roedel , "Michael S . Tsirkin" , Paolo Bonzini , =?UTF-8?q?=5C=22Radim=20Kr=C4=8Dm=C3=A1=C5=99=5C=22?= , Tom Lendacky , Brijesh Singh To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org Return-path: Received: from mail-dm3nam03on0066.outbound.protection.outlook.com ([104.47.41.66]:3232 "EHLO NAM03-DM3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752261AbdGXUDc (ORCPT ); Mon, 24 Jul 2017 16:03:32 -0400 In-Reply-To: <20170724200303.12197-1-brijesh.singh@amd.com> Sender: kvm-owner@vger.kernel.org List-ID: 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 6af04dd..46f41bb 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -511,6 +511,7 @@ 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; @@ -768,6 +769,7 @@ 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; gdt = get_current_gdt_rw(); sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS); @@ -2072,7 +2074,7 @@ 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; } -- 2.9.4