From: Julien Grall <julien.grall@arm.com>
To: xen-devel@lists.xen.org
Cc: proskurin@sec.in.tum.de, Julien Grall <julien.grall@arm.com>,
sstabellini@kernel.org, steve.capper@arm.com,
wei.chen@linaro.org
Subject: [PATCH v2 10/15] xen/arm: p2m: Don't need to restore the state for an idle vCPU.
Date: Thu, 28 Jul 2016 15:20:15 +0100 [thread overview]
Message-ID: <1469715620-4670-11-git-send-email-julien.grall@arm.com> (raw)
In-Reply-To: <1469715620-4670-1-git-send-email-julien.grall@arm.com>
The function p2m_restore_state could be called with an idle vCPU in
arguments (when called by construct_dom0). However, we will never return
to EL0/EL1 in this case, so it is not necessary to restore the p2m
registers.
Signed-off-by: Julien Grall <julien.grall@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
---
Changes in v2:
- Add Stefano's reviewed-by
---
xen/arch/arm/p2m.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 7e524fe..aff5906 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -127,6 +127,9 @@ void p2m_restore_state(struct vcpu *n)
{
register_t hcr;
+ if ( is_idle_vcpu(n) )
+ return;
+
hcr = READ_SYSREG(HCR_EL2);
WRITE_SYSREG(hcr & ~HCR_VM, HCR_EL2);
isb();
--
1.9.1
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next prev parent reply other threads:[~2016-07-28 14:20 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-28 14:20 [PATCH v2 00/15] xen/arm: P2M clean-up fixes Julien Grall
2016-07-28 14:20 ` [PATCH v2 01/15] xen/arm: p2m: Use the typesafe MFN in mfn_to_p2m_entry Julien Grall
2016-07-28 14:20 ` [PATCH v2 02/15] xen/arm: p2m: Use a whitelist rather than blacklist in get_page_from_gfn Julien Grall
2016-07-29 0:38 ` Stefano Stabellini
2016-07-28 14:20 ` [PATCH v2 03/15] xen/arm: p2m: Differentiate cacheable vs non-cacheable MMIO Julien Grall
2016-07-28 14:20 ` [PATCH v2 04/15] xen/arm: p2m: Find the memory attributes based on the p2m type Julien Grall
2016-07-28 14:20 ` [PATCH v2 05/15] xen/arm: p2m: Remove unnecessary locking Julien Grall
2016-07-28 14:20 ` [PATCH v2 06/15] xen/arm: p2m: Introduce p2m_{read, write}_{, un}lock helpers Julien Grall
2016-07-28 14:20 ` [PATCH v2 07/15] xen/arm: p2m: Switch the p2m lock from spinlock to rwlock Julien Grall
2016-07-28 14:20 ` [PATCH v2 08/15] xen/arm: Don't call p2m_alloc_table from arch_domain_create Julien Grall
2016-07-28 14:20 ` [PATCH v2 09/15] xen/arm: p2m: Move the vttbr field from arch_domain to p2m_domain Julien Grall
2016-07-29 0:40 ` Stefano Stabellini
2016-07-28 14:20 ` Julien Grall [this message]
2016-07-28 14:20 ` [PATCH v2 11/15] xen/arm: p2m: Rework the context switch to another VTTBR in flush_tlb_domain Julien Grall
2016-07-29 0:40 ` Stefano Stabellini
2016-07-28 14:20 ` [PATCH v2 12/15] xen/arm: p2m: Inline p2m_load_VTTBR into p2m_restore_state Julien Grall
2016-07-28 14:20 ` [PATCH v2 13/15] xen/arm: Don't export flush_tlb_domain Julien Grall
2016-07-28 14:20 ` [PATCH v2 14/15] xen/arm: p2m: Replace flush_tlb_domain by p2m_flush_tlb Julien Grall
2016-07-28 14:20 ` [PATCH v2 15/15] xen/arm: p2m: Pass the p2m in parameter rather the domain when it is possible Julien Grall
2016-07-29 0:47 ` [PATCH v2 00/15] xen/arm: P2M clean-up fixes Stefano Stabellini
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