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Wed, 6 Jul 2022 16:33:48 +0000 (GMT) Received: from p-imbrenda (unknown [9.145.12.172]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 6 Jul 2022 16:33:48 +0000 (GMT) Date: Wed, 6 Jul 2022 18:33:46 +0200 From: Claudio Imbrenda To: Janosch Frank Cc: kvm390 mailing list , kvm@vger.kernel.org, linux-s390@vger.kernel.org, thuth@redhat.com, seiden@linux.ibm.com, nrb@linux.ibm.com, scgl@linux.ibm.com Subject: Re: [kvm-unit-tests PATCH v2 1/8] s390x: uv-host: Add access checks for donated memory Message-ID: <20220706183346.2a027e8b@p-imbrenda> In-Reply-To: <20220706064024.16573-2-frankja@linux.ibm.com> References: <20220706064024.16573-1-frankja@linux.ibm.com> <20220706064024.16573-2-frankja@linux.ibm.com> Organization: IBM X-Mailer: Claws Mail 4.1.0 (GTK 3.24.34; x86_64-redhat-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: wUHtfsghoQjmQI47-mziYdzlzyZ1F6iC X-Proofpoint-GUID: gFfoUmaUlxtOABi6FKCtRqcQW62fEjT4 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-06_09,2022-06-28_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 malwarescore=0 mlxlogscore=999 adultscore=0 phishscore=0 priorityscore=1501 suspectscore=0 lowpriorityscore=0 mlxscore=0 impostorscore=0 clxscore=1015 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2207060066 Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org On Wed, 6 Jul 2022 06:40:17 +0000 Janosch Frank wrote: > Let's check if the UV really protected all the memory we donated. > > Signed-off-by: Janosch Frank > --- > s390x/uv-host.c | 29 +++++++++++++++++++++++++++++ > 1 file changed, 29 insertions(+) > > diff --git a/s390x/uv-host.c b/s390x/uv-host.c > index a1a6d120..983cb4a1 100644 > --- a/s390x/uv-host.c > +++ b/s390x/uv-host.c > @@ -43,6 +43,24 @@ static void cpu_loop(void) > for (;;) {} > } > > +/* > + * Checks if a memory area is protected as secure memory. > + * Will return true if all pages are protected, false otherwise. > + */ > +static bool access_check_3d(uint64_t *access_ptr, uint64_t len) > +{ > + while (len) { > + expect_pgm_int(); > + *access_ptr += 42; I'm surprised this works, you will get an (expected) exception when reading from the pointer, and then you should get another one (at this point unexpected) when writing > + if (clear_pgm_int() != PGM_INT_CODE_SECURE_STOR_ACCESS) > + return false; > + access_ptr += PAGE_SIZE / sizeof(access_ptr); > + len -= PAGE_SIZE; > + } > + > + return true; > +} > + > static struct cmd_list cmds[] = { > { "init", UVC_CMD_INIT_UV, sizeof(struct uv_cb_init), BIT_UVC_CMD_INIT_UV }, > { "create conf", UVC_CMD_CREATE_SEC_CONF, sizeof(struct uv_cb_cgc), BIT_UVC_CMD_CREATE_SEC_CONF }, > @@ -194,6 +212,10 @@ static void test_cpu_create(void) > report(rc == 0 && uvcb_csc.header.rc == UVC_RC_EXECUTED && > uvcb_csc.cpu_handle, "success"); > > + rc = access_check_3d((uint64_t *)uvcb_csc.stor_origin, > + uvcb_qui.cpu_stor_len); > + report(rc, "Storage protection"); > + > tmp = uvcb_csc.stor_origin; > uvcb_csc.stor_origin = (unsigned long)memalign(PAGE_SIZE, uvcb_qui.cpu_stor_len); > rc = uv_call(0, (uint64_t)&uvcb_csc); > @@ -292,6 +314,13 @@ static void test_config_create(void) > rc = uv_call(0, (uint64_t)&uvcb_cgc); > report(rc == 0 && uvcb_cgc.header.rc == UVC_RC_EXECUTED, "successful"); > > + rc = access_check_3d((uint64_t *)uvcb_cgc.conf_var_stor_origin, vsize); > + report(rc, "Base storage protection"); > + > + rc = access_check_3d((uint64_t *)uvcb_cgc.conf_base_stor_origin, > + uvcb_qui.conf_base_phys_stor_len); > + report(rc, "Variable storage protection"); > + > uvcb_cgc.header.rc = 0; > uvcb_cgc.header.rrc = 0; > tmp = uvcb_cgc.guest_handle;