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dkim=pass header.d=suse.com header.s=susede1 header.b=sdQ92Wiq DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1720609302; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=ltOTFVyo5Uy/X1RTKFluQ2RUhWSohIyrX25ZCB/KpNE=; b=sdQ92WiqNXgpT5tzis+FpuQEk0LBdUw6aNmj4gQ10TlzwkR+qnyOjBEX/qlQOxDBb0iKr1 vy9lHeVcK9GhczwP+i+OKlemk4D/11MwIJLAG0Gj8b1bXp+gfDKYvUWhZ3Nwcp8UN+RXtt ZJrnKD6uclL6CKlyFCscNkDJ3WfcfXo= From: Juergen Gross To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-doc@vger.kernel.org Cc: Juergen Gross , Jonathan Corbet , Boris Ostrovsky , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Peter Zijlstra , Will Deacon , Waiman Long , Boqun Feng , xen-devel@lists.xenproject.org Subject: [PATCH] x86/xen: remove deprecated xen_nopvspin boot parameter Date: Wed, 10 Jul 2024 13:01:39 +0200 Message-ID: <20240710110139.22300-1-jgross@suse.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-1.51 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:email,suse.com:dkim,imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; FUZZY_BLOCKED(0.00)[rspamd.com]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; ARC_NA(0.00)[]; MIME_TRACE(0.00)[0:+]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCPT_COUNT_TWELVE(0.00)[16]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; FROM_EQ_ENVFROM(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; TAGGED_RCPT(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_COUNT_TWO(0.00)[2]; DKIM_TRACE(0.00)[suse.com:+]; FREEMAIL_CC(0.00)[suse.com,lwn.net,oracle.com,linutronix.de,redhat.com,alien8.de,linux.intel.com,zytor.com,infradead.org,kernel.org,gmail.com,lists.xenproject.org]; RCVD_TLS_ALL(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com] X-Rspamd-Action: no action X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: A953021BB7 X-Spam-Flag: NO X-Spam-Score: -1.51 X-Spam-Level: X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1720609324789116600 Content-Type: text/plain; charset="utf-8" The xen_nopvspin boot parameter is deprecated since 2019. nopvspin can be used instead. Remove the xen_nopvspin boot parameter and replace the xen_pvspin variable use cases with nopvspin. This requires to move the nopvspin variable out of the .initdata section, as it needs to be accessed for cpuhotplug, too. Signed-off-by: Juergen Gross Acked-by: Waiman Long Reviewed-by: Boris Ostrovsky --- .../admin-guide/kernel-parameters.txt | 5 ----- arch/x86/xen/spinlock.c | 20 +++++-------------- kernel/locking/qspinlock.c | 2 +- 3 files changed, 6 insertions(+), 21 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentatio= n/admin-guide/kernel-parameters.txt index b33d048e01d8..2074ba03f2e3 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -7439,11 +7439,6 @@ access functions when running as Xen PV guest. The default value is controlled by CONFIG_XEN_PV_MSR_SAFE. =20 - xen_nopvspin [X86,XEN,EARLY] - Disables the qspinlock slowpath using Xen PV optimizations. - This parameter is obsoleted by "nopvspin" parameter, which - has equivalent effect for XEN platform. - xen_nopv [X86] Disables the PV optimizations forcing the HVM guest to run as generic HVM guest with no PV drivers. diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c index 5c6fc16e4b92..8e4efe0fb6f9 100644 --- a/arch/x86/xen/spinlock.c +++ b/arch/x86/xen/spinlock.c @@ -18,7 +18,6 @@ static DEFINE_PER_CPU(int, lock_kicker_irq) =3D -1; static DEFINE_PER_CPU(char *, irq_name); static DEFINE_PER_CPU(atomic_t, xen_qlock_wait_nest); -static bool xen_pvspin =3D true; =20 static void xen_qlock_kick(int cpu) { @@ -68,7 +67,7 @@ void xen_init_lock_cpu(int cpu) int irq; char *name; =20 - if (!xen_pvspin) + if (nopvspin) return; =20 WARN(per_cpu(lock_kicker_irq, cpu) >=3D 0, "spinlock on CPU%d exists on I= RQ%d!\n", @@ -95,7 +94,7 @@ void xen_uninit_lock_cpu(int cpu) { int irq; =20 - if (!xen_pvspin) + if (nopvspin) return; =20 kfree(per_cpu(irq_name, cpu)); @@ -125,10 +124,10 @@ PV_CALLEE_SAVE_REGS_THUNK(xen_vcpu_stolen); void __init xen_init_spinlocks(void) { /* Don't need to use pvqspinlock code if there is only 1 vCPU. */ - if (num_possible_cpus() =3D=3D 1 || nopvspin) - xen_pvspin =3D false; + if (num_possible_cpus() =3D=3D 1) + nopvspin =3D true; =20 - if (!xen_pvspin) { + if (nopvspin) { printk(KERN_DEBUG "xen: PV spinlocks disabled\n"); static_branch_disable(&virt_spin_lock_key); return; @@ -143,12 +142,3 @@ void __init xen_init_spinlocks(void) pv_ops.lock.kick =3D xen_qlock_kick; pv_ops.lock.vcpu_is_preempted =3D PV_CALLEE_SAVE(xen_vcpu_stolen); } - -static __init int xen_parse_nopvspin(char *arg) -{ - pr_notice("\"xen_nopvspin\" is deprecated, please use \"nopvspin\" instea= d\n"); - xen_pvspin =3D false; - return 0; -} -early_param("xen_nopvspin", xen_parse_nopvspin); - diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index 1df5fef8a656..7d96bed718e4 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -583,7 +583,7 @@ EXPORT_SYMBOL(queued_spin_lock_slowpath); #include "qspinlock_paravirt.h" #include "qspinlock.c" =20 -bool nopvspin __initdata; +bool nopvspin; static __init int parse_nopvspin(char *arg) { nopvspin =3D true; --=20 2.43.0