From patchwork Wed Jan 6 00:23:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 12000585 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 14105C433E6 for ; Wed, 6 Jan 2021 00:24:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E12E322EBF for ; Wed, 6 Jan 2021 00:24:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726391AbhAFAYI (ORCPT ); Tue, 5 Jan 2021 19:24:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726231AbhAFAYG (ORCPT ); Tue, 5 Jan 2021 19:24:06 -0500 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DC9EDC06179A for ; Tue, 5 Jan 2021 16:23:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=xO7F7AGN1IW8y6QIXNmMMNfazzRaB+oFtCZEjEKJx9U=; b=oaa6WS9xY7eNxpi7XPj+5MltqB bzlmerVAKCbFievAW7qJcdhsWvCrgwpTnKz1AkEWU4yR1h5P+/ariuXi6WF5F3oLylliAgCmHfQuh Vm/U4IuYisrk3wIuEGwjGb+P4X02LNamHhze2UXR26wfzH2nIfyyqPyU04gJ4UFKhcU1DYNr8CPDl RSrgyK7wDNbGlkAKmCPqNz4jnh2giCdYlw7srReIUk26VbI4+g147AFfmaBMwfH4QMxKa06chPzmS rb/ptDY2TZMyRoSzSfp9qCC/fTLV36Dq1TPWXwu20tiNl1bZmlQmXoXnlksUTKZLNZh59St0l9+Aq FE40WxaQ==; Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kwwbi-0004Zv-EZ; Wed, 06 Jan 2021 00:23:22 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1kwwbh-001Niz-CZ; Wed, 06 Jan 2021 00:23:21 +0000 From: David Woodhouse To: kvm@vger.kernel.org Cc: Paolo Bonzini , Ankur Arora , Joao Martins , Boris Ostrovsky , Sean Christopherson , graf@amazon.com, iaslan@amazon.de, pdurrant@amazon.com, aagch@amazon.com, fandree@amazon.com, hch@infradead.org Subject: [PATCH v4 05/16] KVM: x86/xen: latch long_mode when hypercall page is set up Date: Wed, 6 Jan 2021 00:23:03 +0000 Message-Id: <20210106002314.328380-6-dwmw2@infradead.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210106002314.328380-1-dwmw2@infradead.org> References: <20210106002314.328380-1-dwmw2@infradead.org> MIME-Version: 1.0 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: David Woodhouse Signed-off-by: David Woodhouse --- arch/x86/include/asm/kvm_host.h | 6 ++++++ arch/x86/kvm/xen.c | 16 +++++++++++++++- include/uapi/linux/kvm.h | 3 +++ 3 files changed, 24 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 2ceda5aecac5..4fcb27a9fe36 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -894,6 +894,11 @@ struct msr_bitmap_range { unsigned long *bitmap; }; +/* Xen emulation context */ +struct kvm_xen { + bool long_mode; +}; + enum kvm_irqchip_mode { KVM_IRQCHIP_NONE, KVM_IRQCHIP_KERNEL, /* created with KVM_CREATE_IRQCHIP */ @@ -973,6 +978,7 @@ struct kvm_arch { struct hlist_head mask_notifier_list; struct kvm_hv hyperv; + struct kvm_xen xen; #ifdef CONFIG_KVM_MMU_AUDIT int audit_point; diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c index c0b2c67e0235..52cb9e465542 100644 --- a/arch/x86/kvm/xen.c +++ b/arch/x86/kvm/xen.c @@ -21,6 +21,13 @@ int kvm_xen_hvm_set_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data) int r = -ENOENT; switch (data->type) { + case KVM_XEN_ATTR_TYPE_LONG_MODE: + if (!IS_ENABLED(CONFIG_64BIT) && data->u.long_mode) + return -EINVAL; + + kvm->arch.xen.long_mode = !!data->u.long_mode; + r = 0; + break; default: break; } @@ -33,6 +40,10 @@ int kvm_xen_hvm_get_attr(struct kvm *kvm, struct kvm_xen_hvm_attr *data) int r = -ENOENT; switch (data->type) { + case KVM_XEN_ATTR_TYPE_LONG_MODE: + data->u.long_mode = kvm->arch.xen.long_mode; + r = 0; + break; default: break; } @@ -45,6 +56,10 @@ int kvm_xen_hvm_config(struct kvm_vcpu *vcpu, u64 data) struct kvm *kvm = vcpu->kvm; u32 page_num = data & ~PAGE_MASK; u64 page_addr = data & PAGE_MASK; + bool lm = is_long_mode(vcpu); + + /* Latch long_mode for shared_info pages etc. */ + vcpu->kvm->arch.xen.long_mode = lm; /* * If Xen hypercall intercept is enabled, fill the hypercall @@ -79,7 +94,6 @@ int kvm_xen_hvm_config(struct kvm_vcpu *vcpu, u64 data) return 1; } } else { - int lm = is_long_mode(vcpu); u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32; u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64 diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 7b5fed0cb2ad..b7cf887c8e4d 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1590,10 +1590,13 @@ struct kvm_xen_hvm_attr { __u16 type; union { + __u8 long_mode; __u64 pad[4]; } u; }; +#define KVM_XEN_ATTR_TYPE_LONG_MODE 0x0 + /* Secure Encrypted Virtualization command */ enum sev_cmd_id { /* Guest initialization commands */