From patchwork Thu Feb 8 15:18:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shameerali Kolothum Thodi X-Patchwork-Id: 13549962 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 92CF8C4829C for ; Thu, 8 Feb 2024 15:21:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ZyJHm4ROj5cxrijAphdKx31K7bMGznE7hqJznvdwjlE=; b=D6EgF1OtbmGdEE Ijj7sRH2FAlIjidhEogAKEl64E7F+zQSNJho4hItHJQ4Sv2Wa++8hx30K0ZOvhaRL8uVc3c1/CFiV 7Rh/KsCV6pG0UdP+p/8vGWJffv09g3eQLrvETqKp9/IhFMijVf6N+NO1etYxW/jidX5kKXHDs8RbM Ayb4mPPFIxLP4/ElrGWd/ZnqJ5HCVn6CPn3hqd9TI7ZN5DigMuPWqGrO1nWcRSUTm7P8F3btvwKuy 7TeIiZthYWOm3PBzHu8wuz62iAUzfIcTbvVBZcfx4ddynhfSQ9v9sBK0IijsDPm3ZdUykUh86OWvB mw3msX8yKzm2uO9JJIxw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rY6Cu-0000000E9Gt-3LRl; Thu, 08 Feb 2024 15:20:56 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rY6Cr-0000000E9EL-2MNI for linux-arm-kernel@lists.infradead.org; Thu, 08 Feb 2024 15:20:54 +0000 Received: from mail.maildlp.com (unknown [172.18.186.31]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4TW0vk73tSz6JB4R; Thu, 8 Feb 2024 23:17:06 +0800 (CST) Received: from lhrpeml500005.china.huawei.com (unknown [7.191.163.240]) by mail.maildlp.com (Postfix) with ESMTPS id C8BF9140B2F; Thu, 8 Feb 2024 23:20:49 +0800 (CST) Received: from A2303104131.china.huawei.com (10.202.227.28) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Thu, 8 Feb 2024 15:20:43 +0000 From: Shameer Kolothum To: , , , CC: , , , , , , , , Subject: [RFC PATCH v2 1/7] KVM: Add generic infrastructure to support pinned VMIDs Date: Thu, 8 Feb 2024 15:18:31 +0000 Message-ID: <20240208151837.35068-2-shameerali.kolothum.thodi@huawei.com> X-Mailer: git-send-email 2.12.0.windows.1 In-Reply-To: <20240208151837.35068-1-shameerali.kolothum.thodi@huawei.com> References: <20240208151837.35068-1-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.202.227.28] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240208_072053_775273_D8CE6C9E X-CRM114-Status: GOOD ( 10.55 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Provide generic helper functions to get/put pinned VMIDs if the arch supports it. Signed-off-by: Shameer Kolothum --- include/linux/kvm_host.h | 18 ++++++++++++++++++ virt/kvm/Kconfig | 3 +++ virt/kvm/kvm_main.c | 23 +++++++++++++++++++++++ 3 files changed, 44 insertions(+) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 7e7fd25b09b3..610e239bea46 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -2311,6 +2311,24 @@ static inline void kvm_handle_signal_exit(struct kvm_vcpu *vcpu) } #endif /* CONFIG_KVM_XFER_TO_GUEST_WORK */ +#ifdef CONFIG_HAVE_KVM_PINNED_VMID +int kvm_arch_pinned_vmid_get(struct kvm *kvm); +void kvm_arch_pinned_vmid_put(struct kvm *kvm); +#endif + +#ifdef CONFIG_HAVE_KVM_PINNED_VMID +int kvm_pinned_vmid_get(struct kvm *kvm); +void kvm_pinned_vmid_put(struct kvm *kvm); +#else +static inline int kvm_pinned_vmid_get(struct kvm *kvm) +{ + return -EINVAL; +} + +static inline void kvm_pinned_vmid_put(struct kvm *kvm) +{ +} +#endif /* * If more than one page is being (un)accounted, @virt must be the address of * the first page of a block of pages what were allocated together (i.e diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig index 184dab4ee871..a3052c8e3ac4 100644 --- a/virt/kvm/Kconfig +++ b/virt/kvm/Kconfig @@ -108,3 +108,6 @@ config KVM_GENERIC_PRIVATE_MEM select KVM_GENERIC_MEMORY_ATTRIBUTES select KVM_PRIVATE_MEM bool + +config HAVE_KVM_PINNED_VMID + bool diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 10bfc88a69f7..f84d6da5f464 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -3918,6 +3918,29 @@ bool kvm_vcpu_wake_up(struct kvm_vcpu *vcpu) } EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up); +#ifdef CONFIG_HAVE_KVM_PINNED_VMID +int kvm_pinned_vmid_get(struct kvm *kvm) +{ + int ret; + + if (!kvm_get_kvm_safe(kvm)) + return -ENOENT; + ret = kvm_arch_pinned_vmid_get(kvm); + if (ret < 0) + kvm_put_kvm(kvm); + + return ret; +} +EXPORT_SYMBOL_GPL(kvm_pinned_vmid_get); + +void kvm_pinned_vmid_put(struct kvm *kvm) +{ + kvm_arch_pinned_vmid_put(kvm); + kvm_put_kvm(kvm); +} +EXPORT_SYMBOL_GPL(kvm_pinned_vmid_put); +#endif + #ifndef CONFIG_S390 /* * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.