[Xen-devel] [PATCH v2 12/25] arm/altp2m: Add HVMOP_altp2m_switch_p2m.

[Sergej Proskurin <proskurin@xxxxxxxxxxxxx>]

Signed-off-by: Sergej Proskurin <proskurin@xxxxxxxxxxxxx>
---
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
---
 xen/arch/arm/altp2m.c        | 32 ++++++++++++++++++++++++++++++++
 xen/arch/arm/hvm.c           |  2 +-
 xen/include/asm-arm/altp2m.h |  4 ++++
 3 files changed, 37 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/altp2m.c b/xen/arch/arm/altp2m.c
index 80ed553..7404f42 100644
--- a/xen/arch/arm/altp2m.c
+++ b/xen/arch/arm/altp2m.c
@@ -33,6 +33,38 @@ struct p2m_domain *altp2m_get_altp2m(struct vcpu *v)
     return v->domain->arch.altp2m_p2m[index];
 }
 
+int altp2m_switch_domain_altp2m_by_id(struct domain *d, unsigned int idx)
+{
+    struct vcpu *v;
+    int rc = -EINVAL;
+
+    if ( idx >= MAX_ALTP2M )
+        return rc;
+
+    domain_pause_except_self(d);
+
+    altp2m_lock(d);
+
+    if ( d->arch.altp2m_vttbr[idx] != INVALID_VTTBR )
+    {
+        for_each_vcpu( d, v )
+            if ( idx != vcpu_altp2m(v).p2midx )
+            {
+                atomic_dec(&altp2m_get_altp2m(v)->active_vcpus);
+                vcpu_altp2m(v).p2midx = idx;
+                atomic_inc(&altp2m_get_altp2m(v)->active_vcpus);
+            }
+
+        rc = 0;
+    }
+
+    altp2m_unlock(d);
+
+    domain_unpause_except_self(d);
+
+    return rc;
+}
+
 static void altp2m_vcpu_reset(struct vcpu *v)
 {
     struct altp2mvcpu *av = &vcpu_altp2m(v);
diff --git a/xen/arch/arm/hvm.c b/xen/arch/arm/hvm.c
index df29cdc..3b508df 100644
--- a/xen/arch/arm/hvm.c
+++ b/xen/arch/arm/hvm.c
@@ -129,7 +129,7 @@ static int do_altp2m_op(XEN_GUEST_HANDLE_PARAM(void) arg)
         break;
 
     case HVMOP_altp2m_switch_p2m:
-        rc = -EOPNOTSUPP;
+        rc = altp2m_switch_domain_altp2m_by_id(d, a.u.view.view);
         break;
 
     case HVMOP_altp2m_set_mem_access:
diff --git a/xen/include/asm-arm/altp2m.h b/xen/include/asm-arm/altp2m.h
index afa1580..790bb33 100644
--- a/xen/include/asm-arm/altp2m.h
+++ b/xen/include/asm-arm/altp2m.h
@@ -49,6 +49,10 @@ void altp2m_teardown(struct domain *d);
 void altp2m_vcpu_initialise(struct vcpu *v);
 void altp2m_vcpu_destroy(struct vcpu *v);
 
+/* Switch alternate p2m for entire domain */
+int altp2m_switch_domain_altp2m_by_id(struct domain *d,
+                                      unsigned int idx);
+
 /* Make a specific alternate p2m valid. */
 int altp2m_init_by_id(struct domain *d,
                       unsigned int idx);
-- 
2.9.0


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