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From: Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
To: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
	Stefano Stabellini <sstabellini@kernel.org>,
	Julien Grall <julien@xen.org>,
	Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
Subject: [RFC PATCH 06/10] arm: setup: disable preemption during startup
Date: Tue, 23 Feb 2021 02:34:57 +0000	[thread overview]
Message-ID: <20210223023428.757694-7-volodymyr_babchuk@epam.com> (raw)
In-Reply-To: <20210223023428.757694-1-volodymyr_babchuk@epam.com>

In the subsequent patches we will enable preemption in the hypervisor
mode. But we don't want any preemption attempts while system is
still not ready to call scheduler. So we should disable preemption
during early boot stages and enable it only when we switched to idle
vCPU stack.

Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
---
 xen/arch/arm/setup.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 2532ec9739..15a618b87c 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -78,6 +78,9 @@ static __used void init_done(void)
     unregister_init_virtual_region();
 
     free_init_memory();
+
+    preempt_enable();
+
     startup_cpu_idle_loop();
 }
 
@@ -920,6 +923,7 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     setup_system_domains();
 
+    preempt_disable();
     local_irq_enable();
     local_abort_enable();
 
-- 
2.29.2


  parent reply	other threads:[~2021-02-23  2:35 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23  2:34 [RFC PATCH 00/10] Preemption in hypervisor (ARM only) Volodymyr Babchuk
2021-02-23  2:34 ` [RFC PATCH 01/10] sched: core: save IRQ state during locking Volodymyr Babchuk
2021-02-23  8:52   ` Jürgen Groß
2021-02-23 11:15     ` Volodymyr Babchuk
2021-02-24 18:29   ` Andrew Cooper
2021-02-23  2:34 ` [RFC PATCH 03/10] sched: credit2: " Volodymyr Babchuk
2021-02-23  2:34 ` [RFC PATCH 02/10] sched: rt: " Volodymyr Babchuk
2021-02-23  2:34 ` [RFC PATCH 04/10] preempt: use atomic_t to for preempt_count Volodymyr Babchuk
2021-02-23  2:34 ` [RFC PATCH 05/10] preempt: add try_preempt() function Volodymyr Babchuk
2021-02-23  2:34 ` [RFC PATCH 07/10] sched: core: remove ASSERT_NOT_IN_ATOMIC and disable preemption[!] Volodymyr Babchuk
2021-02-23  2:34 ` Volodymyr Babchuk [this message]
2021-02-23  2:34 ` [RFC PATCH 08/10] arm: context_switch: allow to run with IRQs already disabled Volodymyr Babchuk
2021-02-23  2:34 ` [RFC PATCH 10/10] [HACK] alloc pages: enable preemption early Volodymyr Babchuk
2021-02-23  2:34 ` [RFC PATCH 09/10] arm: traps: try to preempt before leaving IRQ handler Volodymyr Babchuk
2021-02-23  9:02 ` [RFC PATCH 00/10] Preemption in hypervisor (ARM only) Julien Grall
2021-02-23 12:06   ` Volodymyr Babchuk
2021-02-24 10:08     ` Julien Grall
2021-02-24 20:57       ` Volodymyr Babchuk
2021-02-24 22:31         ` Julien Grall
2021-02-24 23:58           ` Volodymyr Babchuk
2021-02-25  0:39             ` Andrew Cooper
2021-02-25 12:51               ` Volodymyr Babchuk
2021-03-05  9:31                 ` Volodymyr Babchuk
2021-02-24 18:07 ` Andrew Cooper
2021-02-24 23:37   ` Volodymyr Babchuk
2021-03-01 14:39     ` George Dunlap

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