From mboxrd@z Thu Jan 1 00:00:00 1970 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=-5.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 946BDC5DF62 for ; Wed, 6 Nov 2019 05:58:41 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 441A62075C for ; Wed, 6 Nov 2019 05:58:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=ozlabs.org header.i=@ozlabs.org header.b="ciR7ncEP" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 441A62075C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=ozlabs.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id DFC136B026A; Wed, 6 Nov 2019 00:58:35 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id D83EC6B026B; Wed, 6 Nov 2019 00:58:35 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C723C6B026C; Wed, 6 Nov 2019 00:58:35 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0218.hostedemail.com [216.40.44.218]) by kanga.kvack.org (Postfix) with ESMTP id AA7D66B026A for ; Wed, 6 Nov 2019 00:58:35 -0500 (EST) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with SMTP id 626C6180AD817 for ; Wed, 6 Nov 2019 05:58:35 +0000 (UTC) X-FDA: 76124798190.19.roof29_85179011c4d11 X-HE-Tag: roof29_85179011c4d11 X-Filterd-Recvd-Size: 3466 Received: from ozlabs.org (ozlabs.org [203.11.71.1]) by imf18.hostedemail.com (Postfix) with ESMTP for ; Wed, 6 Nov 2019 05:58:34 +0000 (UTC) Received: by ozlabs.org (Postfix, from userid 1003) id 477G6q5JGMz9sQy; Wed, 6 Nov 2019 16:58:27 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ozlabs.org; s=201707; t=1573019907; bh=uxD2BTixjqrm1dB6sKzow9x5pztHfF4238phxQ8BQKU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ciR7ncEPNUOWorVTvgXfESPYNSN7jm+1hXyZWGYwgCOVWVQAABvrmxGJUn0lbFxDO kRCHi3iRYKvCe6p/C/hmqZBxW7DyTHoAm94WB/4Z8HUIZV9QbLREGsRRq7GhHEWSDg maJv1xzn7cjVJve4Saz0lG7qwhpQHoIsgfO/zeOMdnTMqHhK35t1XLMHIRBk7Piokg zGzMC1UassrHrRfJp5dIOnh+EuF29AMcsfuALIWUtpOoODRhy5dzCRpJXofdQvpGmq KlAPYgunlyi9E6Po8S39aVXpIHpnRcNHlZqSZWAGgbql8jWCifdZCPNex+5ybe9I4d hIYmpQty8wLCQ== Date: Wed, 6 Nov 2019 15:34:57 +1100 From: Paul Mackerras To: Bharata B Rao Cc: linuxppc-dev@lists.ozlabs.org, kvm-ppc@vger.kernel.org, linux-mm@kvack.org, paulus@au1.ibm.com, aneesh.kumar@linux.vnet.ibm.com, jglisse@redhat.com, cclaudio@linux.ibm.com, linuxram@us.ibm.com, sukadev@linux.vnet.ibm.com, hch@lst.de Subject: Re: [PATCH v10 2/8] KVM: PPC: Support for running secure guests Message-ID: <20191106043457.GC12069@oak.ozlabs.ibm.com> References: <20191104041800.24527-1-bharata@linux.ibm.com> <20191104041800.24527-3-bharata@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191104041800.24527-3-bharata@linux.ibm.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Nov 04, 2019 at 09:47:54AM +0530, Bharata B Rao wrote: > A pseries guest can be run as secure guest on Ultravisor-enabled > POWER platforms. On such platforms, this driver will be used to manage > the movement of guest pages between the normal memory managed by > hypervisor (HV) and secure memory managed by Ultravisor (UV). > > HV is informed about the guest's transition to secure mode via hcalls: > > H_SVM_INIT_START: Initiate securing a VM > H_SVM_INIT_DONE: Conclude securing a VM > > As part of H_SVM_INIT_START, register all existing memslots with > the UV. H_SVM_INIT_DONE call by UV informs HV that transition of > the guest to secure mode is complete. > > These two states (transition to secure mode STARTED and transition > to secure mode COMPLETED) are recorded in kvm->arch.secure_guest. > Setting these states will cause the assembly code that enters the > guest to call the UV_RETURN ucall instead of trying to enter the > guest directly. > > Migration of pages betwen normal and secure memory of secure > guest is implemented in H_SVM_PAGE_IN and H_SVM_PAGE_OUT hcalls. > > H_SVM_PAGE_IN: Move the content of a normal page to secure page > H_SVM_PAGE_OUT: Move the content of a secure page to normal page > > Private ZONE_DEVICE memory equal to the amount of secure memory > available in the platform for running secure guests is created. > Whenever a page belonging to the guest becomes secure, a page from > this private device memory is used to represent and track that secure > page on the HV side. The movement of pages between normal and secure > memory is done via migrate_vma_pages() using UV_PAGE_IN and > UV_PAGE_OUT ucalls. > > Signed-off-by: Bharata B Rao Reviewed-by: Paul Mackerras