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[RFC PATCH v6 33/43] arm/altp2m: Add altp2m_set_view_visibility{,_locked} support
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Rose Spangler <Rose.Spangler@xxxxxxxxxxxxxx>
- Date: Mon, 20 Apr 2026 17:31:56 -0400
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- Cc: Rose Spangler <Rose.Spangler@xxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, "Volodymyr Babchuk" <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Mon, 20 Apr 2026 21:33:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
This commit adds the altp2m_set_view_visibility and
altp2m_set_view_visibility_locked functions on ARM. This makes it possible
to set the altp2m view visibility in common altp2m routines (namely,
altp2m_flush).
This is commit 4/5 of the altp2m view validity/visibility phase.
Signed-off-by: Rose Spangler <Rose.Spangler@xxxxxxxxxxxxxx>
---
v6: Introduced this patch.
---
xen/arch/arm/altp2m.c | 30 ++++++++++++++++++++++++++++++
xen/arch/arm/include/asm/altp2m.h | 8 ++++++++
2 files changed, 38 insertions(+)
diff --git a/xen/arch/arm/altp2m.c b/xen/arch/arm/altp2m.c
index 0e19e197e826..aa48c17e11a3 100644
--- a/xen/arch/arm/altp2m.c
+++ b/xen/arch/arm/altp2m.c
@@ -37,6 +37,36 @@ bool altp2m_view_is_visible(struct domain *d, unsigned int
idx)
return d->arch.altp2m_state[array_index_nospec(idx, d->nr_altp2m)] ==
ALTP2M_VISIBLE;
}
+int altp2m_set_view_visibility(struct domain *d, unsigned int altp2m_idx,
+ uint8_t visible)
+{
+ int rc;
+
+ altp2m_lock(d);
+ rc = altp2m_set_view_visibility_locked(d, altp2m_idx, visible);
+ altp2m_unlock(d);
+
+ return rc;
+}
+
+int altp2m_set_view_visibility_locked(struct domain *d, unsigned int
altp2m_idx,
+ uint8_t visible)
+{
+ int rc = 0;
+
+ if ( altp2m_idx >= d->nr_altp2m || !altp2m_view_is_valid(d, altp2m_idx) )
+ rc = -EINVAL;
+ else if ( visible )
+ d->arch.altp2m_state[array_index_nospec(altp2m_idx, d->nr_altp2m)] =
+ ALTP2M_VISIBLE;
+ else
+ d->arch.altp2m_state[array_index_nospec(altp2m_idx, d->nr_altp2m)] =
+ ALTP2M_INVISIBLE;
+
+ return rc;
+}
+
+
/*
* Local variables:
* mode: C
diff --git a/xen/arch/arm/include/asm/altp2m.h
b/xen/arch/arm/include/asm/altp2m.h
index fbe66ad5536d..f8d0dd799a4a 100644
--- a/xen/arch/arm/include/asm/altp2m.h
+++ b/xen/arch/arm/include/asm/altp2m.h
@@ -40,6 +40,14 @@ enum altp2m_view_state {
ALTP2M_INVISIBLE,
};
+/* Set a specific p2m view visibility */
+int altp2m_set_view_visibility(struct domain *d, unsigned int altp2m_idx,
+ uint8_t visible);
+
+/* Set a specific p2m view visibility (with lock already held) */
+int altp2m_set_view_visibility_locked(struct domain *d, unsigned int
altp2m_idx,
+ uint8_t visible);
+
#else /* CONFIG_ALTP2M */
static inline bool altp2m_supported(void)
--
2.34.1
|
