[Xen-devel] [PATCH] x86/vcpu: Remove struct vcpu allocation restriction for !CONFIG_SHADOW_PAGING

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

There is no need for struct vcpu to live below the 4G boundary if shadow
paging is compiled out.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
CC: Tim Deegan <tim@xxxxxxx>
---
 xen/arch/x86/domain.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 943f95b..35cfa24 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -311,8 +311,11 @@ struct vcpu *alloc_vcpu_struct(void)
      * may require that the shadow CR3 points below 4GB, and hence the whole
      * structure must satisfy this restriction. Thus we specify MEMF_bits(32).
      */
+    unsigned int memflags =
+        IS_ENABLED(CONFIG_SHADOW_PAGING) ? MEMF_bits(32) : 0;
+
     BUILD_BUG_ON(sizeof(*v) > PAGE_SIZE);
-    v = alloc_xenheap_pages(0, MEMF_bits(32));
+    v = alloc_xenheap_pages(0, memflags);
     if ( v != NULL )
         clear_page(v);
     return v;
-- 
2.1.4


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