From patchwork Wed Oct 25 15:23:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 13436429 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0A14DC25B47 for ; Wed, 25 Oct 2023 15:25:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235031AbjJYPY7 (ORCPT ); Wed, 25 Oct 2023 11:24:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46238 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235012AbjJYPY7 (ORCPT ); Wed, 25 Oct 2023 11:24:59 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 734C112F for ; Wed, 25 Oct 2023 08:24:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1698247453; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=/UY00r4KJgutxwf++YFP2KIoZ7cjz3Yt618EIRpz4fA=; b=VdNjBs5U+ty/SGA6SY/T1xywAIIuhPS1/XdKvWLZuZcKPwnEKvqfSjelTgzSFLH1kFl43h 0h218OVhetlIRyX9sv8nBRf5R075i7tzNQfyCLfDDbJ0pWAhqD2VCQVnKTBkW3f3rknwJi 2r5PxREF7l3tANPsUjMf0t0WmQJWmsI= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-642-b95o5wwuO0ifj5N-nPufZg-1; Wed, 25 Oct 2023 11:24:09 -0400 X-MC-Unique: b95o5wwuO0ifj5N-nPufZg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 564A0802891; Wed, 25 Oct 2023 15:24:09 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.45.226.101]) by smtp.corp.redhat.com (Postfix) with ESMTP id 69EB12166B26; Wed, 25 Oct 2023 15:24:08 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini , Sean Christopherson , Maxim Levitsky Cc: linux-kernel@vger.kernel.org Subject: [PATCH 01/14] KVM: x86: xen: Remove unneeded xen context from struct kvm_arch when !CONFIG_KVM_XEN Date: Wed, 25 Oct 2023 17:23:53 +0200 Message-ID: <20231025152406.1879274-2-vkuznets@redhat.com> In-Reply-To: <20231025152406.1879274-1-vkuznets@redhat.com> References: <20231025152406.1879274-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Saving a few bytes of memory per KVM VM is certainly great but what's more important is the ability to see where the code accesses Xen emulation context while CONFIG_KVM_XEN is not enabled. Currently, kvm_cpu_get_extint() is the only such place and it is harmless: kvm_xen_has_interrupt() always returns '0' when !CONFIG_KVM_XEN. No functional change intended. Reviewed-by: Maxim Levitsky Signed-off-by: Vitaly Kuznetsov --- arch/x86/include/asm/kvm_host.h | 5 +++++ arch/x86/kvm/irq.c | 2 ++ 2 files changed, 7 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 394e1a31c02c..d107516b4591 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1136,6 +1136,7 @@ struct msr_bitmap_range { unsigned long *bitmap; }; +#ifdef CONFIG_KVM_XEN /* Xen emulation context */ struct kvm_xen { struct mutex xen_lock; @@ -1147,6 +1148,7 @@ struct kvm_xen { struct idr evtchn_ports; unsigned long poll_mask[BITS_TO_LONGS(KVM_MAX_VCPUS)]; }; +#endif enum kvm_irqchip_mode { KVM_IRQCHIP_NONE, @@ -1349,7 +1351,10 @@ struct kvm_arch { struct hlist_head mask_notifier_list; struct kvm_hv hyperv; + +#ifdef CONFIG_KVM_XEN struct kvm_xen xen; +#endif bool backwards_tsc_observed; bool boot_vcpu_runs_old_kvmclock; diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c index b2c397dd2bc6..ad9ca8a60144 100644 --- a/arch/x86/kvm/irq.c +++ b/arch/x86/kvm/irq.c @@ -118,8 +118,10 @@ static int kvm_cpu_get_extint(struct kvm_vcpu *v) if (!lapic_in_kernel(v)) return v->arch.interrupt.nr; +#ifdef CONFIG_KVM_XEN if (kvm_xen_has_interrupt(v)) return v->kvm->arch.xen.upcall_vector; +#endif if (irqchip_split(v->kvm)) { int vector = v->arch.pending_external_vector;