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Tue, 3 Mar 2026 18:33:39 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id DVznIYMpp2nXFAAAD6G6ig (envelope-from ); Tue, 03 Mar 2026 18:33:39 +0000 From: Pedro Falcato To: Damien Le Moal , Niklas Cassel Cc: linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, Pedro Falcato Subject: [PATCH] ata: libata-core: Add BRIDGE_OK quirk for QEMU drives Date: Tue, 3 Mar 2026 18:33:37 +0000 Message-ID: <20260303183337.1013474-1-pfalcato@suse.de> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Rspamd-Action: no action X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_DN_SOME(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:106:10:150:64:167:received,2a07:de40:b281:104:10:150:64:97:from]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_FIVE(0.00)[5]; RCVD_TLS_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,suse.de:dkim,suse.de:mid,suse.de:email]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.de:+] X-Rspamd-Queue-Id: 07D7E1FAA7 X-Spam-Flag: NO X-Spam-Score: -3.01 X-Spam-Level: Content-Type: text/plain; charset="utf-8" Currently, whenever you boot with a QEMU drive over an AHCI interface, you get: [ 1.632121] ata1.00: applying bridge limits This happens due to the kernel not believing the given drive is SATA, since word 93 of IDENTIFY (ATA_ID_HW_CONFIG) is non-zero. The result is a pretty severe limit in max_hw_sectors_kb, which limits our IO sizes. QEMU shares IDENTIFY data between PATA/SATA drives (and the corresponding emulation of IDE/AHCI) but does not, in any way, emulate any of these real hardware details. There is no PATA drive and no SATA cable. As such, add a BRIDGE_OK quirk for QEMU HARDDISK. This results in the max_hw_sectors being limited solely by the controller interface's limits. Which, for AHCI controllers, takes it from 128KB to 32767KB. Signed-off-by: Pedro Falcato Reviewed-by: Damien Le Moal --- Note: This may be ok for stable, but I'll leave it up to you. There is obviously no Fixes: here that doesn't go back 20 years. drivers/ata/libata-core.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index d61846f03edc..70703432063a 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -4231,6 +4231,7 @@ static const struct ata_dev_quirks_entry __ata_dev_qu= irks[] =3D { /* Devices that do not need bridging limits applied */ { "MTRON MSP-SATA*", NULL, ATA_QUIRK_BRIDGE_OK }, { "BUFFALO HD-QSU2/R5", NULL, ATA_QUIRK_BRIDGE_OK }, + { "QEMU HARDDISK", NULL, ATA_QUIRK_BRIDGE_OK }, =20 /* Devices which aren't very happy with higher link speeds */ { "WD My Book", NULL, ATA_QUIRK_1_5_GBPS }, --=20 2.53.0