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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 13 Feb 2020 07:43:35 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 01D7gdwd47710590 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 13 Feb 2020 07:42:39 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E59CDA4060; Thu, 13 Feb 2020 07:43:33 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 80D40A405F; Thu, 13 Feb 2020 07:43:33 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.71]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 13 Feb 2020 07:43:33 +0000 (GMT) Subject: Re: [PATCH 05/35] s390/mm: provide memory management functions for protected KVM guests To: Cornelia Huck Cc: Janosch Frank , KVM , David Hildenbrand , Thomas Huth , Ulrich Weigand , Claudio Imbrenda , Andrea Arcangeli , linux-s390 , Michael Mueller , Vasily Gorbik , linux-mm@kvack.org, Andrew Morton References: <20200207113958.7320-1-borntraeger@de.ibm.com> <20200207113958.7320-6-borntraeger@de.ibm.com> <20200212144212.1d0b4226.cohuck@redhat.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <20200212144212.1d0b4226.cohuck@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 20021307-4275-0000-0000-000003A10749 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20021307-4276-0000-0000-000038B50772 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-13_01:2020-02-12,2020-02-13 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=752 clxscore=1015 phishscore=0 bulkscore=0 priorityscore=1501 malwarescore=0 suspectscore=0 lowpriorityscore=0 spamscore=0 mlxscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002130059 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 12.02.20 14:42, Cornelia Huck wrote: > On Fri, 7 Feb 2020 06:39:28 -0500 > Christian Borntraeger wrote: > >> From: Claudio Imbrenda >> >> This provides the basic ultravisor calls and page table handling to cope >> with secure guests: >> - provide arch_make_page_accessible >> - make pages accessible after unmapping of secure guests >> - provide the ultravisor commands convert to/from secure >> - provide the ultravisor commands pin/unpin shared >> - provide callbacks to make pages secure (inacccessible) >> - we check for the expected pin count to only make pages secure if the >> host is not accessing them >> - we fence hugetlbfs for secure pages >> >> Co-developed-by: Ulrich Weigand >> Signed-off-by: Ulrich Weigand >> Signed-off-by: Claudio Imbrenda >> [borntraeger@de.ibm.com: patch merging, splitting, fixing] >> Signed-off-by: Christian Borntraeger >> --- >> arch/s390/include/asm/gmap.h | 2 + >> arch/s390/include/asm/mmu.h | 2 + >> arch/s390/include/asm/mmu_context.h | 1 + >> arch/s390/include/asm/page.h | 5 + >> arch/s390/include/asm/pgtable.h | 34 +++++- >> arch/s390/include/asm/uv.h | 52 +++++++++ >> arch/s390/kernel/uv.c | 172 ++++++++++++++++++++++++++++ >> 7 files changed, 263 insertions(+), 5 deletions(-) > > (...) > >> +/* >> + * Requests the Ultravisor to encrypt a guest page and make it >> + * accessible to the host for paging (export). >> + * >> + * @paddr: Absolute host address of page to be exported >> + */ >> +int uv_convert_from_secure(unsigned long paddr) >> +{ >> + struct uv_cb_cfs uvcb = { >> + .header.cmd = UVC_CMD_CONV_FROM_SEC_STOR, >> + .header.len = sizeof(uvcb), >> + .paddr = paddr >> + }; >> + >> + uv_call(0, (u64)&uvcb); >> + >> + if (uvcb.header.rc == 1 || uvcb.header.rc == 0x107) > > I think this either wants a comment or some speaking #defines. Yes. We will improve some other aspects of this patch, but I will add /* Return on success or if this page was already exported */ > >> + return 0; >> + return -EINVAL; >> +} > > (...) >