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Thu, 27 Aug 2020 12:52:56 +0000 (UTC) Subject: Re: [PATCH RFC v2 3/4] pc-bios: s390x: Save io and external new PSWs before overwriting them To: Janosch Frank , qemu-devel@nongnu.org References: <20200827093152.3026-1-frankja@linux.ibm.com> <20200827093152.3026-4-frankja@linux.ibm.com> From: Thomas Huth Message-ID: Date: Thu, 27 Aug 2020 14:52:55 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20200827093152.3026-4-frankja@linux.ibm.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=thuth@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US Received-SPF: pass client-ip=205.139.110.120; envelope-from=thuth@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/27 00:13:19 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -47 X-Spam_score: -4.8 X-Spam_bar: ---- X-Spam_report: (-4.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.959, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-1.782, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: borntraeger@de.ibm.com, cohuck@redhat.com, david@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 27/08/2020 11.31, Janosch Frank wrote: > Currently we always overwrite the mentioned exception new PSWs before > loading the enabled wait PSW. Let's save the PSW before overwriting > and restore it right before starting the loaded kernel. > > Signed-off-by: Janosch Frank > --- > > Maybe we should rather statically allocate a lowcore so we don't dirty > 0x0 at all. > > --- > pc-bios/s390-ccw/jump2ipl.c | 3 ++ > pc-bios/s390-ccw/start.S | 62 +++++++++++++++++++++++++++---------- > 2 files changed, 48 insertions(+), 17 deletions(-) > > diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c > index 143d027bf7..a44f3ab5b3 100644 > --- a/pc-bios/s390-ccw/jump2ipl.c > +++ b/pc-bios/s390-ccw/jump2ipl.c > @@ -13,12 +13,15 @@ > #define KERN_IMAGE_START 0x010000UL > #define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_64) > > +extern uint64_t *psw_save_io, *psw_save_ext; I think that should be extern uint64_t psw_save_io[], psw_save_ext[]; instead ... otherwise you'll end up with some funny bugs here, won't you? > uint64_t *reset_psw = 0, save_psw, ipl_continue; > > static void jump_to_IPL_2(void) > { > /* Restore reset PSW and io and external new PSWs */ Ok, now the comment makes sense :-) > *reset_psw = save_psw; > + memcpy((void *)0x1f0, psw_save_io, 16); > + memcpy((void *)0x1b0, psw_save_ext, 16); Could you use &lowcore->external_new_psw and &lowcore->io_new_psw instead of the magic numbers? Thomas