From nobody Sat Feb 7 13:41:41 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4DB8E145B27; Fri, 5 Jul 2024 09:32:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720171921; cv=none; b=qEIyiF84YWXZcNyX4hVMn0bvHaON5NIBFpbjsA4tFdxX+roqZ/5JMr7qhFzmcHWoIGdazIxGL/b02+MwCxORdW68RVowx9CUMRlPwV7UMoLCnlAbfWkH2R2zi35za4DQbM3s7Nx9lt3OXdj51UmSoFW/qjmSkCCNrVdZxe5/VII= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720171921; c=relaxed/simple; bh=nzaJSHHvHLH4tw2NS88X2blB90LpkIyqdRotWeSvNdM=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=QqdQTGTDMtPpiccs39Wq4qtPuLcUKin/v4GztP+FNhnn9BI0No0MoAuuIfKQrlhwUaRYWIURPsWdI/etbUoomZiLYcHZ2mNDbD+ZnIDJQ+PVZ3S/DqxaiPsPIdJGirQ77tYzqGlru6RbnT2F61Ibt+BMabDr76bVlemhdc8tSQo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=l1x7D6Tb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="l1x7D6Tb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A5DCC32781; Fri, 5 Jul 2024 09:32:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720171921; bh=nzaJSHHvHLH4tw2NS88X2blB90LpkIyqdRotWeSvNdM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l1x7D6TbGvzN0orBc1T5rVFA9zBXP6ySBl1DRMs7OBq2jTKIh0HogJS+qy1CWoK3v xTF52gz5KHoVCuVE8tdni+gUbp8I5nmK86yaUe4dDDPtTfkDHSdidv0iy8xRw4sKPO /LCG/9aQb8iD623oAja57AtHxuKPhi6PUZbda6WNo+GmQyTo8MFu1pUs3tHNLvTZM4 CAkrqJRTnbYPl9oQv3EVtM36SyhFvz7SbNAjr/J5SEfnTCqwZZF7G76j/MFwk7PSvf GDilttOWS7Dft3HUfLPLjxh6LyyGiY5CiP6+ek/xv75zUtVnYfNLmXZoRQ3rbtbxz7 BeCz/wkr9ojBA== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1sPfIM-00A0NK-PY; Fri, 05 Jul 2024 10:31:58 +0100 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Thomas Gleixner , Nianyao Tang Subject: [PATCH 1/3] irqchip/gic-v4: Always configure affinity on VPE activation Date: Fri, 5 Jul 2024 10:31:53 +0100 Message-Id: <20240705093155.871070-2-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240705093155.871070-1-maz@kernel.org> References: <20240705093155.871070-1-maz@kernel.org> 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-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, tangnianyao@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Content-Type: text/plain; charset="utf-8" We currently have two paths to set the initial affinity of a VPE: - at activation time on GICv4 without the stupid VMOVP list, and on GICv4.1 - at map time for GICv4 with VMOVP list The latter location may end-up modifying the affinity of VPE that is currently running, making the results unpredictible. Instead, unify the two paths, making sure we only set the initial affinity at activation time. Reported-by: Nianyao Tang Signed-off-by: Marc Zyngier Tested-by: Nianyao Tang --- drivers/irqchip/irq-gic-v3-its.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-= its.c index 3c755d5dad6e6..a00c5e8c4ea65 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1809,13 +1809,9 @@ static void its_map_vm(struct its_node *its, struct = its_vm *vm) =20 for (i =3D 0; i < vm->nr_vpes; i++) { struct its_vpe *vpe =3D vm->vpes[i]; - struct irq_data *d =3D irq_get_irq_data(vpe->irq); =20 - /* Map the VPE to the first possible CPU */ - vpe->col_idx =3D cpumask_first(cpu_online_mask); its_send_vmapp(its, vpe, true); its_send_vinvall(its, vpe); - irq_data_update_effective_affinity(d, cpumask_of(vpe->col_idx)); } } =20 @@ -4562,6 +4558,10 @@ static int its_vpe_irq_domain_activate(struct irq_do= main *domain, struct its_vpe *vpe =3D irq_data_get_irq_chip_data(d); struct its_node *its; =20 + /* Map the VPE to the first possible CPU */ + vpe->col_idx =3D cpumask_first(cpu_online_mask); + irq_data_update_effective_affinity(d, cpumask_of(vpe->col_idx)); + /* * If we use the list map, we issue VMAPP on demand... Unless * we're on a GICv4.1 and we eagerly map the VPE on all ITSs @@ -4570,9 +4570,6 @@ static int its_vpe_irq_domain_activate(struct irq_dom= ain *domain, if (!gic_requires_eager_mapping()) return 0; =20 - /* Map the VPE to the first possible CPU */ - vpe->col_idx =3D cpumask_first(cpu_online_mask); - list_for_each_entry(its, &its_nodes, entry) { if (!is_v4(its)) continue; @@ -4581,8 +4578,6 @@ static int its_vpe_irq_domain_activate(struct irq_dom= ain *domain, its_send_vinvall(its, vpe); } =20 - irq_data_update_effective_affinity(d, cpumask_of(vpe->col_idx)); - return 0; } =20 --=20 2.39.2 From nobody Sat Feb 7 13:41:41 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8F3FE1474A3; Fri, 5 Jul 2024 09:32:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720171921; cv=none; b=KUDpdqsPHQTyKch3p2eDrUOB8z44LuJ6jQ26BqysB6UT9QZyXdr7DyWZXEJFrgMkuSqqXzpc9aoGZMS5bDt8N+IizIfQIRbzhLD4jnakx5Ik/2gaii8/HHJvHoJdTQ3vYhadt6Te2F44kdEhLuuoq/gq1D1XNhcSgd2zmlcEiv0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720171921; c=relaxed/simple; bh=GJ1I7tTBeFCHTX2tR7t3dckUliPv66ihFKX42pTzlaI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=LkoUgbmrNMV0hyb0xgSyvLvCpPad04BnlPALaVpzKfdxKYEOP3+oQO4gvchfYJrAcfGA/zmZsih45wF6Pwt2FDGYbghOWZYLA7ig8YKkQxd1q3Zj3Bo4wJv4JUfC3Ral0fgjjTYewr33y80NiVvP/1RD47cUxegoZoXZS8gOkfY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=d2jpyzUX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="d2jpyzUX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43CF6C4AF0B; Fri, 5 Jul 2024 09:32:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720171921; bh=GJ1I7tTBeFCHTX2tR7t3dckUliPv66ihFKX42pTzlaI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d2jpyzUXLIecjzta5xVfmWJaZzluULhfveAbqrErKtR46N0Y8mBppf1EjHNHxov7Q cq6t+A5UH1Z2sTt497M6zQHca1S68fiTtTMiDyhZeGjUoa5ScZFuo+JV3nUqPYzU7+ lpn50ALL4r5VA7uRZXlkhrsi+lkEhEsbHpLL4RpsaQyfb4ZUvexU9EpRix70XlnLiP v+VDf2XhxedlQh57BMTj1E1/pLN/F9LzcAFrNCd7uikxwxlx+c8lYzK0ROcD3BzBea EcRzV+mZ/SXvGt/xx9xPZzBUWLKfiAUrf1I3h1Yxi+YVBQZnuI1y2qoRQdrHNYN+TL VZ3QDPAzuYw5w== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1sPfIN-00A0NK-1O; Fri, 05 Jul 2024 10:31:59 +0100 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Thomas Gleixner , Nianyao Tang Subject: [PATCH 2/3] irqchip/gic-v4: Substitute vmovp_lock for a per-VM lock Date: Fri, 5 Jul 2024 10:31:54 +0100 Message-Id: <20240705093155.871070-3-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240705093155.871070-1-maz@kernel.org> References: <20240705093155.871070-1-maz@kernel.org> 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-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, tangnianyao@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Content-Type: text/plain; charset="utf-8" vmovp_lock is abused in a number of cases to serialise updates to vlpi_count[] and deal with map/unmap of a VM to ITSs. Instead, provide a per-VM lock and revisit the use of vlpi_count[] so that it is always wrapped in this per-VM vmapp_lock. This reduces the potential contention on a concurrent VMOVP command, and paves the way for subsequent VPE locking that holding vmovp_lock actively prevents due to the lock ordering. Signed-off-by: Marc Zyngier Tested-by: Nianyao Tang --- drivers/irqchip/irq-gic-v3-its.c | 27 ++++++++++++--------------- include/linux/irqchip/arm-gic-v4.h | 8 ++++++++ 2 files changed, 20 insertions(+), 15 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-= its.c index a00c5e8c4ea65..b52d60097cad5 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1317,7 +1317,6 @@ static void its_send_vmovp(struct its_vpe *vpe) { struct its_cmd_desc desc =3D {}; struct its_node *its; - unsigned long flags; int col_id =3D vpe->col_idx; =20 desc.its_vmovp_cmd.vpe =3D vpe; @@ -1329,6 +1328,12 @@ static void its_send_vmovp(struct its_vpe *vpe) return; } =20 + /* + * Protect against concurrent updates of the mapping state on + * individual VMs. + */ + guard(raw_spinlock_irqsave)(&vpe->its_vm->vmapp_lock); + /* * Yet another marvel of the architecture. If using the * its_list "feature", we need to make sure that all ITSs @@ -1337,8 +1342,7 @@ static void its_send_vmovp(struct its_vpe *vpe) * * Wall <-- Head. */ - raw_spin_lock_irqsave(&vmovp_lock, flags); - + guard(raw_spinlock)(&vmovp_lock); desc.its_vmovp_cmd.seq_num =3D vmovp_seq_num++; desc.its_vmovp_cmd.its_list =3D get_its_list(vpe->its_vm); =20 @@ -1353,8 +1357,6 @@ static void its_send_vmovp(struct its_vpe *vpe) desc.its_vmovp_cmd.col =3D &its->collections[col_id]; its_send_single_vcommand(its, its_build_vmovp_cmd, &desc); } - - raw_spin_unlock_irqrestore(&vmovp_lock, flags); } =20 static void its_send_vinvall(struct its_node *its, struct its_vpe *vpe) @@ -1791,12 +1793,10 @@ static bool gic_requires_eager_mapping(void) =20 static void its_map_vm(struct its_node *its, struct its_vm *vm) { - unsigned long flags; - if (gic_requires_eager_mapping()) return; =20 - raw_spin_lock_irqsave(&vmovp_lock, flags); + guard(raw_spinlock_irqsave)(&vm->vmapp_lock); =20 /* * If the VM wasn't mapped yet, iterate over the vpes and get @@ -1814,19 +1814,15 @@ static void its_map_vm(struct its_node *its, struct= its_vm *vm) its_send_vinvall(its, vpe); } } - - raw_spin_unlock_irqrestore(&vmovp_lock, flags); } =20 static void its_unmap_vm(struct its_node *its, struct its_vm *vm) { - unsigned long flags; - /* Not using the ITS list? Everything is always mapped. */ if (gic_requires_eager_mapping()) return; =20 - raw_spin_lock_irqsave(&vmovp_lock, flags); + guard(raw_spinlock_irqsave)(&vm->vmapp_lock); =20 if (!--vm->vlpi_count[its->list_nr]) { int i; @@ -1834,8 +1830,6 @@ static void its_unmap_vm(struct its_node *its, struct= its_vm *vm) for (i =3D 0; i < vm->nr_vpes; i++) its_send_vmapp(its, vm->vpes[i], false); } - - raw_spin_unlock_irqrestore(&vmovp_lock, flags); } =20 static int its_vlpi_map(struct irq_data *d, struct its_cmd_info *info) @@ -3922,6 +3916,8 @@ static void its_vpe_invall(struct its_vpe *vpe) { struct its_node *its; =20 + guard(raw_spinlock_irqsave)(&vpe->its_vm->vmapp_lock); + list_for_each_entry(its, &its_nodes, entry) { if (!is_v4(its)) continue; @@ -4527,6 +4523,7 @@ static int its_vpe_irq_domain_alloc(struct irq_domain= *domain, unsigned int virq vm->db_lpi_base =3D base; vm->nr_db_lpis =3D nr_ids; vm->vprop_page =3D vprop_page; + raw_spin_lock_init(&vm->vmapp_lock); =20 if (gic_rdists->has_rvpeid) irqchip =3D &its_vpe_4_1_irq_chip; diff --git a/include/linux/irqchip/arm-gic-v4.h b/include/linux/irqchip/arm= -gic-v4.h index 2c63375bbd43f..ecabed6d33075 100644 --- a/include/linux/irqchip/arm-gic-v4.h +++ b/include/linux/irqchip/arm-gic-v4.h @@ -25,6 +25,14 @@ struct its_vm { irq_hw_number_t db_lpi_base; unsigned long *db_bitmap; int nr_db_lpis; + /* + * Ensures mutual exclusion between updates to vlpi_count[] + * and map/unmap when using the ITSList mechanism. + * + * The lock order for any sequence involving the ITSList is + * vmapp_lock -> vpe_lock ->vmovp_lock. + */ + raw_spinlock_t vmapp_lock; u32 vlpi_count[GICv4_ITS_LIST_MAX]; }; =20 --=20 2.39.2 From nobody Sat Feb 7 13:41:41 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E1F671474B6; Fri, 5 Jul 2024 09:32:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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SAEximRunCond expanded to false Content-Type: text/plain; charset="utf-8" In order to make sure that vpe->col_idx is correctly sampled when a VMAPP command is issued, we must hold the lock for the VPE. This is now possible since the introduction of the per-VM vmapp_lock, which can be taken before vpe_lock in the locking order. Signed-off-by: Marc Zyngier Tested-by: Nianyao Tang --- drivers/irqchip/irq-gic-v3-its.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-= its.c index b52d60097cad5..951ec140bcea2 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1810,7 +1810,9 @@ static void its_map_vm(struct its_node *its, struct i= ts_vm *vm) for (i =3D 0; i < vm->nr_vpes; i++) { struct its_vpe *vpe =3D vm->vpes[i]; =20 - its_send_vmapp(its, vpe, true); + scoped_guard(raw_spinlock, &vpe->vpe_lock) + its_send_vmapp(its, vpe, true); + its_send_vinvall(its, vpe); } } @@ -1827,8 +1829,10 @@ static void its_unmap_vm(struct its_node *its, struc= t its_vm *vm) if (!--vm->vlpi_count[its->list_nr]) { int i; =20 - for (i =3D 0; i < vm->nr_vpes; i++) + for (i =3D 0; i < vm->nr_vpes; i++) { + guard(raw_spinlock)(&vm->vpes[i]->vpe_lock); its_send_vmapp(its, vm->vpes[i], false); + } } } =20 --=20 2.39.2