[Xen-devel] [RFC PATCH V2 1/4] xen/hap: Increase hap page pool size for more vcpus support

[Lan Tianyu <tianyu.lan@xxxxxxxxx>]

This patch is to increase hap page pool size to support more vcpus in single VM.

Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
 xen/arch/x86/mm/hap/hap.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c
index cdc77a9..96a7ed0 100644
--- a/xen/arch/x86/mm/hap/hap.c
+++ b/xen/arch/x86/mm/hap/hap.c
@@ -464,6 +464,7 @@ void hap_domain_init(struct domain *d)
 int hap_enable(struct domain *d, u32 mode)
 {
     unsigned int old_pages;
+    unsigned int pages;
     unsigned int i;
     int rv = 0;
 
@@ -473,7 +474,14 @@ int hap_enable(struct domain *d, u32 mode)
     if ( old_pages == 0 )
     {
         paging_lock(d);
-        rv = hap_set_allocation(d, 256, NULL);
+
+        /* Increase hap page pool with max vcpu number. */
+        if ( d->max_vcpus > 128 )
+            pages = 256;
+        else
+            pages = 512;
+
+        rv = hap_set_allocation(d, pages, NULL);
         if ( rv != 0 )
         {
             hap_set_allocation(d, 0, NULL);
-- 
1.8.3.1


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