From: Stefano Stabellini <sstabellini@kernel.org>
To: Julien Grall <julien.grall@arm.com>
Cc: proskurin@sec.in.tum.de, sstabellini@kernel.org,
steve.capper@arm.com, wei.chen@linaro.org,
xen-devel@lists.xen.org
Subject: Re: [PATCH 12/22] xen/arm: p2m: Remove unnecessary locking
Date: Tue, 26 Jul 2016 17:47:38 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.10.1607261744530.12319@sstabellini-ThinkPad-X260> (raw)
In-Reply-To: <1469031064-23344-13-git-send-email-julien.grall@arm.com>
On Wed, 20 Jul 2016, Julien Grall wrote:
> The p2m is not yet in use when p2m_init and p2m_allocate_table are
> called. Furthermore the p2m is not used anymore when p2m_teardown is
> called. So taking the p2m lock is not necessary.
>
> Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
> xen/arch/arm/p2m.c | 14 +-------------
> 1 file changed, 1 insertion(+), 13 deletions(-)
>
> diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
> index 2f50b4f..4c279dc 100644
> --- a/xen/arch/arm/p2m.c
> +++ b/xen/arch/arm/p2m.c
> @@ -1267,8 +1267,6 @@ int p2m_alloc_table(struct domain *d)
> if ( page == NULL )
> return -ENOMEM;
>
> - spin_lock(&p2m->lock);
> -
> /* Clear both first level pages */
> for ( i = 0; i < P2M_ROOT_PAGES; i++ )
> clear_and_clean_page(page + i);
> @@ -1284,8 +1282,6 @@ int p2m_alloc_table(struct domain *d)
> */
> flush_tlb_domain(d);
>
> - spin_unlock(&p2m->lock);
> -
> return 0;
> }
>
> @@ -1350,8 +1346,6 @@ void p2m_teardown(struct domain *d)
> struct p2m_domain *p2m = &d->arch.p2m;
> struct page_info *pg;
>
> - spin_lock(&p2m->lock);
> -
> while ( (pg = page_list_remove_head(&p2m->pages)) )
> free_domheap_page(pg);
>
> @@ -1363,8 +1357,6 @@ void p2m_teardown(struct domain *d)
> p2m_free_vmid(d);
>
> radix_tree_destroy(&p2m->mem_access_settings, NULL);
> -
> - spin_unlock(&p2m->lock);
> }
>
> int p2m_init(struct domain *d)
> @@ -1375,12 +1367,11 @@ int p2m_init(struct domain *d)
> spin_lock_init(&p2m->lock);
> INIT_PAGE_LIST_HEAD(&p2m->pages);
>
> - spin_lock(&p2m->lock);
> p2m->vmid = INVALID_VMID;
>
> rc = p2m_alloc_vmid(d);
> if ( rc != 0 )
> - goto err;
> + return rc;
>
> d->arch.vttbr = 0;
>
> @@ -1393,9 +1384,6 @@ int p2m_init(struct domain *d)
> p2m->mem_access_enabled = false;
> radix_tree_init(&p2m->mem_access_settings);
>
> -err:
> - spin_unlock(&p2m->lock);
> -
> return rc;
> }
>
> --
> 1.9.1
>
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next prev parent reply other threads:[~2016-07-27 0:47 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-20 16:10 [PATCH 00/22] xen/arm: P2M clean-up and fixes Julien Grall
2016-07-20 16:10 ` [PATCH 01/22] xen/arm: system: Use the correct parameter name in local_irq_restore Julien Grall
2016-07-22 1:19 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 02/22] xen/arm: p2m: Pass the vCPU in parameter to get_page_from_gva Julien Grall
2016-07-22 1:22 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 03/22] xen/arm: p2m: Restrict usage of get_page_from_gva to the current vCPU Julien Grall
2016-07-22 1:25 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 04/22] xen/arm: p2m: Fix multi-lines coding style comments Julien Grall
2016-07-22 1:26 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 05/22] xen/arm: p2m: Clean-up mfn_to_p2m_entry Julien Grall
2016-07-26 22:24 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 06/22] xen/arm: p2m: Use the typesafe MFN in mfn_to_p2m_entry Julien Grall
2016-07-26 22:28 ` Stefano Stabellini
2016-07-27 9:54 ` Julien Grall
2016-07-27 18:25 ` Stefano Stabellini
2016-07-27 20:14 ` Julien Grall
2016-07-20 16:10 ` [PATCH 07/22] xen/arm: p2m: Use p2m_is_foreign in get_page_from_gfn to avoid open coding Julien Grall
2016-07-26 22:33 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 08/22] xen/arm: p2m: Simplify p2m type check by using bitmask Julien Grall
2016-07-26 22:36 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 09/22] xen/arm: p2m: Use a whitelist rather than blacklist in get_page_from_gfn Julien Grall
2016-07-26 22:44 ` Stefano Stabellini
2016-07-27 9:59 ` Julien Grall
2016-07-27 17:56 ` Stefano Stabellini
2016-07-27 17:57 ` Julien Grall
2016-07-20 16:10 ` [PATCH 10/22] xen/arm: p2m: Differentiate cacheable vs non-cacheable MMIO Julien Grall
2016-07-26 22:47 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 11/22] xen/arm: p2m: Find the memory attributes based on the p2m type Julien Grall
2016-07-27 0:41 ` Stefano Stabellini
2016-07-27 17:15 ` Julien Grall
2016-07-27 17:55 ` Stefano Stabellini
2016-07-27 20:15 ` Julien Grall
2016-07-20 16:10 ` [PATCH 12/22] xen/arm: p2m: Remove unnecessary locking Julien Grall
2016-07-27 0:47 ` Stefano Stabellini [this message]
2016-07-20 16:10 ` [PATCH 13/22] xen/arm: p2m: Introduce p2m_{read, write}_{, un}lock helpers Julien Grall
2016-07-27 0:50 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 14/22] xen/arm: p2m: Switch the p2m lock from spinlock to rwlock Julien Grall
2016-07-27 0:51 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 15/22] xen/arm: Don't call p2m_alloc_table from arch_domain_create Julien Grall
2016-07-22 8:32 ` Sergej Proskurin
2016-07-22 9:18 ` Julien Grall
2016-07-22 10:16 ` Sergej Proskurin
2016-07-22 10:26 ` Julien Grall
2016-07-22 10:39 ` Sergej Proskurin
2016-07-22 10:38 ` Julien Grall
2016-07-22 11:05 ` Sergej Proskurin
2016-07-22 13:00 ` Julien Grall
2016-07-23 17:59 ` Sergej Proskurin
2016-07-27 0:54 ` Stefano Stabellini
2016-07-20 16:10 ` [PATCH 16/22] xen/arm: p2m: Move the vttbr field from arch_domain to p2m_domain Julien Grall
2016-07-22 7:46 ` Sergej Proskurin
2016-07-22 9:23 ` Julien Grall
2016-07-27 0:57 ` Stefano Stabellini
2016-07-27 10:00 ` Julien Grall
2016-07-27 17:19 ` Julien Grall
2016-07-20 16:10 ` [PATCH 17/22] xen/arm: p2m: Don't need to restore the state for an idle vCPU Julien Grall
2016-07-22 7:37 ` Sergej Proskurin
2016-07-27 1:05 ` Stefano Stabellini
2016-07-20 16:11 ` [PATCH 18/22] xen/arm: p2m: Rework the context switch to another VTTBR in flush_tlb_domain Julien Grall
2016-07-22 7:51 ` Sergej Proskurin
2016-07-27 1:12 ` Stefano Stabellini
2016-07-27 10:22 ` Julien Grall
2016-07-20 16:11 ` [PATCH 19/22] xen/arm: p2m: Inline p2m_load_VTTBR into p2m_restore_state Julien Grall
2016-07-22 8:07 ` Sergej Proskurin
2016-07-22 9:29 ` Julien Grall
2016-07-27 1:13 ` Stefano Stabellini
2016-07-20 16:11 ` [PATCH 20/22] xen/arm: Don't export flush_tlb_domain Julien Grall
2016-07-22 8:54 ` Sergej Proskurin
2016-07-22 9:30 ` Julien Grall
2016-07-22 10:25 ` Sergej Proskurin
2016-07-22 10:34 ` Julien Grall
2016-07-22 10:46 ` Sergej Proskurin
2016-07-22 10:57 ` Julien Grall
2016-07-22 11:22 ` Sergej Proskurin
2016-07-27 1:14 ` Stefano Stabellini
2016-07-20 16:11 ` [PATCH 21/22] xen/arm: p2m: Replace flush_tlb_domain by p2m_flush_tlb Julien Grall
2016-07-27 1:15 ` Stefano Stabellini
2016-07-20 16:11 ` [PATCH 22/22] xen/arm: p2m: Pass the p2m in parameter rather the domain when it is possible Julien Grall
2016-07-27 1:15 ` Stefano Stabellini
2016-07-22 1:31 ` [PATCH 00/22] xen/arm: P2M clean-up and fixes Stefano Stabellini
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