From: Hongyan Xia <hongyax@amazon.com>
Date: Wed, 11 Sep 2019 09:37:14 +0000 (+0100)
Subject: x86/mapcache: initialise the mapcache even for the idle domain
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=e8a96e2c0a3278f7ff284911dfa9f0e02360b0cc;p=people%2Fpauldu%2Fxen.git

x86/mapcache: initialise the mapcache even for the idle domain

In situations where PMAP cannot be used or the mapcache of a domain is
simply not ready, we need to have a mapcache in the idle domain to map
pages when there is no direct map.

Signed-off-by: Hongyan Xia <hongyax@amazon.com>
---

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index df62b9d7bc..a199a46b55 100644
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -6025,6 +6025,9 @@ int create_perdomain_mapping(struct domain *d, unsigned long va,
         l3tab = __map_domain_page(pg);
         clear_page(l3tab);
         d->arch.perdomain_l3_pg = pg;
+        if ( is_idle_domain(d) )
+            idle_pg_table[l4_table_offset(PERDOMAIN_VIRT_START)] =
+                    l4e_from_page(pg, __PAGE_HYPERVISOR_RW);
         if ( !nr )
         {
             unmap_domain_page(l3tab);
diff --git a/xen/common/schedule.c b/xen/common/schedule.c
index e70cc70a65..f151b7109b 100644
--- a/xen/common/schedule.c
+++ b/xen/common/schedule.c
@@ -2740,6 +2740,9 @@ void __init scheduler_init(void)
     BUG_ON(nr_cpu_ids > ARRAY_SIZE(idle_vcpu));
     idle_domain->vcpu = idle_vcpu;
     idle_domain->max_vcpus = nr_cpu_ids;
+#ifndef CONFIG_DIRECTMAP
+    mapcache_domain_init(idle_domain);
+#endif
     if ( vcpu_create(idle_domain, 0) == NULL )
         BUG();