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[RFC PATCH v6 41/43] altp2m: Move altp2m_flush to common code
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Rose Spangler <Rose.Spangler@xxxxxxxxxxxxxx>
- Date: Mon, 20 Apr 2026 17:32:04 -0400
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- Cc: Rose Spangler <Rose.Spangler@xxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, "Michal Orzel" <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, "Stefano Stabellini" <sstabellini@xxxxxxxxxx>
- Delivery-date: Mon, 20 Apr 2026 21:34:03 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
This commit moves the altp2m_flush function to common code. This makes it
possible to call in the common implementation of HVMOP_set_domain_state.
This commit contains only code movement, and no change in functionality is
intended.
This is commit 1/2 of the altp2m_flush phase.
Signed-off-by: Rose Spangler <Rose.Spangler@xxxxxxxxxxxxxx>
---
v6: Introduced this patch.
---
xen/arch/x86/include/asm/altp2m.h | 2 --
xen/arch/x86/mm/altp2m.c | 16 ----------------
xen/common/altp2m.c | 18 ++++++++++++++++++
xen/include/xen/altp2m.h | 5 +++++
4 files changed, 23 insertions(+), 18 deletions(-)
diff --git a/xen/arch/x86/include/asm/altp2m.h
b/xen/arch/x86/include/asm/altp2m.h
index 02b5e1a11220..d11f20f1e790 100644
--- a/xen/arch/x86/include/asm/altp2m.h
+++ b/xen/arch/x86/include/asm/altp2m.h
@@ -82,8 +82,6 @@ static inline bool altp2m_view_is_visible(struct domain *d,
unsigned int idx)
/* Switch alternate p2m for a single vcpu */
bool altp2m_switch_vcpu_by_id(struct vcpu *v, unsigned int idx);
-/* Flush all the alternate p2m's for a domain */
-void altp2m_flush(struct domain *d);
/* Find an available alternate p2m and make it valid */
int altp2m_init_next_available(struct domain *d, uint16_t *idx,
diff --git a/xen/arch/x86/mm/altp2m.c b/xen/arch/x86/mm/altp2m.c
index 18f8a71f1682..de91d1e67709 100644
--- a/xen/arch/x86/mm/altp2m.c
+++ b/xen/arch/x86/mm/altp2m.c
@@ -253,22 +253,6 @@ void altp2m_reset_altp2m(struct domain *d, unsigned int
idx,
p2m_unlock(p2m);
}
-void altp2m_flush(struct domain *d)
-{
- unsigned int i;
-
- altp2m_lock(d);
-
- for ( i = 0; i < d->nr_altp2m; i++ )
- {
- altp2m_reset_altp2m(d, i, ALTP2M_DEACTIVATE);
- d->arch.altp2m_eptp[i] = mfn_x(INVALID_MFN);
- d->arch.altp2m_visible_eptp[i] = mfn_x(INVALID_MFN);
- }
-
- altp2m_unlock(d);
-}
-
int altp2m_activate_altp2m(struct domain *d, unsigned int idx,
p2m_access_t hvmmem_default_access)
{
diff --git a/xen/common/altp2m.c b/xen/common/altp2m.c
index 929449b1b03c..0dd3ecf226fd 100644
--- a/xen/common/altp2m.c
+++ b/xen/common/altp2m.c
@@ -123,6 +123,24 @@ int altp2m_init_by_id(struct domain *d, unsigned int idx)
return rc;
}
+#ifdef CONFIG_X86
+void altp2m_flush(struct domain *d)
+{
+ unsigned int i;
+
+ altp2m_lock(d);
+
+ for ( i = 0; i < d->nr_altp2m; i++ )
+ {
+ altp2m_reset_altp2m(d, i, ALTP2M_DEACTIVATE);
+ d->arch.altp2m_eptp[i] = mfn_x(INVALID_MFN);
+ d->arch.altp2m_visible_eptp[i] = mfn_x(INVALID_MFN);
+ }
+
+ altp2m_unlock(d);
+}
+#endif
+
/*
* altp2m operations are envisioned as being used in several different
* modes:
diff --git a/xen/include/xen/altp2m.h b/xen/include/xen/altp2m.h
index 8fc16346d95b..fa2c11f5432e 100644
--- a/xen/include/xen/altp2m.h
+++ b/xen/include/xen/altp2m.h
@@ -74,6 +74,11 @@ int do_altp2m_op(XEN_GUEST_HANDLE_PARAM(void) arg);
/* Make a specific alternate p2m valid */
int altp2m_init_by_id(struct domain *d, unsigned int idx);
+#ifdef CONFIG_X86
+/* Flush all the alternate p2m's for a domain */
+void altp2m_flush(struct domain *d);
+#endif
+
#else /* CONFIG_ALTP2M */
static inline bool altp2m_active(const struct domain *d)
--
2.34.1
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