From: Julien Grall <julien.grall@arm.com>
To: xen-devel@lists.xen.org
Cc: andre.przywara@arm.com, Julien Grall <julien.grall@arm.com>,
sstabellini@kernel.org
Subject: [PATCH v3 8/9] xen/arm: mm: Handle permission flags when adding a new mapping
Date: Mon, 2 Oct 2017 18:31:49 +0100 [thread overview]
Message-ID: <20171002173150.5404-9-julien.grall@arm.com> (raw)
In-Reply-To: <20171002173150.5404-1-julien.grall@arm.com>
Currently, all the new mappings will be read-write non-executable. Allow the
caller to use other permissions.
Signed-off-by: Julien Grall <julien.grall@arm.com>
---
Changes in v2:
- Switch the runtime check to a BUG_ON()
---
xen/arch/arm/mm.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 117f05a1d6..57afedf0be 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1022,6 +1022,9 @@ static int create_xen_entries(enum xenmap_operation op,
if ( op == RESERVE )
break;
pte = mfn_to_xen_entry(mfn, PAGE_AI_MASK(flags));
+ pte.pt.ro = PAGE_RO_MASK(flags);
+ pte.pt.xn = PAGE_XN_MASK(flags);
+ BUG_ON(!pte.pt.ro && !pte.pt.xn);
pte.pt.table = 1;
write_pte(entry, pte);
break;
--
2.11.0
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next prev parent reply other threads:[~2017-10-02 17:31 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-02 17:31 [PATCH v3 0/9] xen/arm: Memory subsystem clean-up Julien Grall
2017-10-02 17:31 ` [PATCH v3 1/9] xen/arm: page: Use ARMv8 naming to improve readability Julien Grall
2017-10-02 17:31 ` [PATCH v3 2/9] xen/arm: page: Clean-up the definition of MAIRVAL Julien Grall
2017-10-02 17:31 ` [PATCH v3 3/9] xen/arm: mm: Rename and clarify AP[1] in the stage-1 page table Julien Grall
2017-10-02 17:31 ` [PATCH v3 4/9] xen/arm: Switch to SYS_STATE_boot just after end_boot_allocator() Julien Grall
2017-10-02 17:31 ` [PATCH v3 5/9] xen/arm: mm: Rename 'ai' into 'flags' in create_xen_entries Julien Grall
2017-10-02 17:31 ` [PATCH v3 6/9] xen/arm: page: Describe the layout of flags used to update page tables Julien Grall
2017-10-02 17:31 ` [PATCH v3 7/9] xen/arm: mm: Embed permission in the flags Julien Grall
2017-10-09 12:34 ` Julien Grall
2017-10-02 17:31 ` Julien Grall [this message]
2017-10-02 17:31 ` [PATCH v3 9/9] xen/arm: mm: Use memory flags for modify_xen_mappings rather than custom one Julien Grall
2017-10-02 18:14 ` Konrad Rzeszutek Wilk
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