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Mon, 4 Dec 2023 15:23:34 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap2.dmz-prg2.suse.org with ESMTPSA id m6VRHvbubWU4JgAAn2gu4w (envelope-from ); Mon, 04 Dec 2023 15:23:34 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 175903ae-92b9-11ee-98e5-6d05b1d4d9a1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1701703414; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=06xhZUNn8wMG33vXmrBvLhXQYrmhEPNGSLjT0D5WEEg=; b=PWqbjIbCKJRmP9IpOQuHXskej2+0oGva+bYoAGrvQJ+rp2189LjzkCSVJ+EZFpKT6zIBF5 8bp/TeQ8C4bTZe2wSSloWLJ5kTg+LLYwDNfmEf0CkaVcmKZ8z/KFXscbNBZ4NRkhVIVohV zUDGXhksYfpzJ46Nn4KeW9sKOLnXP8M= From: Juergen Gross To: xen-devel@lists.xenproject.org Cc: Juergen Gross , George Dunlap , Dario Faggioli , =?UTF-8?q?Ren=C3=A9=20Winther=20H=C3=B8jgaard?= , Jan Beulich , George Dunlap Subject: [PATCH v2 2/3] xen/sched: fix sched_move_domain() Date: Mon, 4 Dec 2023 16:23:20 +0100 Message-Id: <20231204152321.16520-3-jgross@suse.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20231204152321.16520-1-jgross@suse.com> References: <20231204152321.16520-1-jgross@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Authentication-Results: smtp-out2.suse.de; none X-Spam-Level: X-Spam-Score: -4.10 X-Spamd-Result: default: False [-4.10 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; REPLY(-4.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; RCPT_COUNT_SEVEN(0.00)[7]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-0.00)[12.34%] X-Spam-Flag: NO X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1701703442746100001 Do cleanup in sched_move_domain() in a dedicated service function, which is called either in error case with newly allocated data, or in success case with the old data to be freed. This will at once fix some subtle bugs which sneaked in due to forgetting to overwrite some pointers in the error case. Fixes: 70fadc41635b ("xen/cpupool: support moving domain between cpupools w= ith different granularity") Reported-by: Ren=C3=A9 Winther H=C3=B8jgaard Initial-fix-by: Jan Beulich Initial-fix-by: George Dunlap Signed-off-by: Juergen Gross Acked-by: George Dunlap Reviewed-by: Jan Beulich --- V2: - make ops parameter of new function const (Jan Beulich) --- xen/common/sched/core.c | 47 +++++++++++++++++++++++------------------ 1 file changed, 27 insertions(+), 20 deletions(-) diff --git a/xen/common/sched/core.c b/xen/common/sched/core.c index eba0cea4bb..901782bbb4 100644 --- a/xen/common/sched/core.c +++ b/xen/common/sched/core.c @@ -647,6 +647,24 @@ static void sched_move_irqs(const struct sched_unit *u= nit) vcpu_move_irqs(v); } =20 +static void sched_move_domain_cleanup(const struct scheduler *ops, + struct sched_unit *units, + void *domdata) +{ + struct sched_unit *unit, *old_unit; + + for ( unit =3D units; unit; ) + { + if ( unit->priv ) + sched_free_udata(ops, unit->priv); + old_unit =3D unit; + unit =3D unit->next_in_list; + xfree(old_unit); + } + + sched_free_domdata(ops, domdata); +} + /* * Move a domain from one cpupool to another. * @@ -686,7 +704,6 @@ int sched_move_domain(struct domain *d, struct cpupool = *c) void *old_domdata; unsigned int gran =3D cpupool_get_granularity(c); unsigned int n_units =3D d->vcpu[0] ? DIV_ROUND_UP(d->max_vcpus, gran)= : 0; - int ret =3D 0; =20 for_each_vcpu ( d, v ) { @@ -699,8 +716,9 @@ int sched_move_domain(struct domain *d, struct cpupool = *c) domdata =3D sched_alloc_domdata(c->sched, d); if ( IS_ERR(domdata) ) { - ret =3D PTR_ERR(domdata); - goto out; + rcu_read_unlock(&sched_res_rculock); + + return PTR_ERR(domdata); } =20 for ( unit_idx =3D 0; unit_idx < n_units; unit_idx++ ) @@ -718,10 +736,10 @@ int sched_move_domain(struct domain *d, struct cpupoo= l *c) =20 if ( !unit || !unit->priv ) { - old_units =3D new_units; - old_domdata =3D domdata; - ret =3D -ENOMEM; - goto out_free; + sched_move_domain_cleanup(c->sched, new_units, domdata); + rcu_read_unlock(&sched_res_rculock); + + return -ENOMEM; } =20 unit_ptr =3D &unit->next_in_list; @@ -808,22 +826,11 @@ int sched_move_domain(struct domain *d, struct cpupoo= l *c) =20 domain_unpause(d); =20 - out_free: - for ( unit =3D old_units; unit; ) - { - if ( unit->priv ) - sched_free_udata(c->sched, unit->priv); - old_unit =3D unit; - unit =3D unit->next_in_list; - xfree(old_unit); - } - - sched_free_domdata(old_ops, old_domdata); + sched_move_domain_cleanup(old_ops, old_units, old_domdata); =20 - out: rcu_read_unlock(&sched_res_rculock); =20 - return ret; + return 0; } =20 void sched_destroy_vcpu(struct vcpu *v) --=20 2.35.3