From: Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
To: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: "tee-dev@lists.linaro.org" <tee-dev@lists.linaro.org>,
Julien Grall <julien.grall@arm.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>
Subject: [Xen-devel] [PATCH 2/5] xen/arm: optee: check for preemption while freeing shared buffers
Date: Fri, 23 Aug 2019 18:48:47 +0000 [thread overview]
Message-ID: <20190823184826.14525-3-volodymyr_babchuk@epam.com> (raw)
In-Reply-To: <20190823184826.14525-1-volodymyr_babchuk@epam.com>
Now we have limit for one shared buffer size, so we can be sure that
one call to free_optee_shm_buf() will not free all
MAX_TOTAL_SMH_BUF_PG pages at once. Thus, we now can check for
hypercall_preempt_check() in the loop inside
optee_relinquish_resources() and this will ensure that we are not
missing preemption.
Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
---
xen/arch/arm/tee/optee.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/xen/arch/arm/tee/optee.c b/xen/arch/arm/tee/optee.c
index f4fa8a7758..a84ffa3089 100644
--- a/xen/arch/arm/tee/optee.c
+++ b/xen/arch/arm/tee/optee.c
@@ -634,14 +634,14 @@ static int optee_relinquish_resources(struct domain *d)
if ( hypercall_preempt_check() )
return -ERESTART;
- /*
- * TODO: Guest can pin up to MAX_TOTAL_SMH_BUF_PG pages and all of
- * them will be put in this loop. It is worth considering to
- * check for preemption inside the loop.
- */
list_for_each_entry_safe( optee_shm_buf, optee_shm_buf_tmp,
&ctx->optee_shm_buf_list, list )
+ {
+ if ( hypercall_preempt_check() )
+ return -ERESTART;
+
free_optee_shm_buf(ctx, optee_shm_buf->cookie);
+ }
if ( hypercall_preempt_check() )
return -ERESTART;
--
2.22.0
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next prev parent reply other threads:[~2019-08-23 18:49 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-23 18:48 [Xen-devel] [PATCH 0/5] arch/arm: optee: fix TODOs and remove "experimental" status Volodymyr Babchuk
2019-08-23 18:48 ` [Xen-devel] [PATCH 1/5] xen/arm: optee: impose limit on shared buffer size Volodymyr Babchuk
2019-09-09 22:11 ` Julien Grall
2019-09-11 18:48 ` Volodymyr Babchuk
2019-09-12 19:32 ` Julien Grall
2019-09-12 19:45 ` Volodymyr Babchuk
2019-09-12 19:51 ` Julien Grall
2019-09-16 15:26 ` Volodymyr Babchuk
2019-09-17 10:49 ` Julien Grall
2019-09-17 12:28 ` Volodymyr Babchuk
2019-09-17 18:46 ` Julien Grall
2019-08-23 18:48 ` Volodymyr Babchuk [this message]
2019-09-09 22:19 ` [Xen-devel] [PATCH 2/5] xen/arm: optee: check for preemption while freeing shared buffers Julien Grall
2019-09-11 18:53 ` Volodymyr Babchuk
2019-09-12 19:39 ` Julien Grall
2019-09-12 19:47 ` Volodymyr Babchuk
2019-08-23 18:48 ` [Xen-devel] [PATCH 3/5] xen/arm: optee: limit number of " Volodymyr Babchuk
2019-08-23 18:48 ` [Xen-devel] [PATCH 4/5] xen/arm: optee: handle share buffer translation error Volodymyr Babchuk
2019-09-10 11:17 ` Julien Grall
2019-09-11 18:32 ` Volodymyr Babchuk
2019-09-12 18:55 ` Julien Grall
2019-08-23 18:48 ` [Xen-devel] [PATCH 5/5] xen/arm: optee: remove experimental status Volodymyr Babchuk
2019-08-23 19:05 ` Julien Grall
2019-08-23 19:20 ` Volodymyr Babchuk
2019-09-09 21:31 ` Julien Grall
2019-09-11 18:41 ` Volodymyr Babchuk
2019-09-12 19:00 ` Julien Grall
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