[PATCH v2] x86: Lift mapcache variable to the arch level

[Elias El Yandouzi <eliasely@amazon.com>]

From: Wei Liu <wei.liu2@citrix.com>

It is going to be needed by HVM and idle domain as well, because without
the direct map, both need a mapcache to map pages.

This only lifts the mapcache variable up. Whether we populate the
mapcache for a domain is unchanged in this patch.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Wei Wang <wawei@amazon.de>
Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
Signed-off-by: Julien Grall <jgrall@amazon.com>

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 8a31d18f69..8ef3f7746f 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -843,6 +843,8 @@ int arch_domain_create(struct domain *d,
 
     psr_domain_init(d);
 
+    mapcache_domain_init(d);
+
     if ( is_hvm_domain(d) )
     {
         if ( (rc = hvm_domain_initialise(d, config)) != 0 )
@@ -850,8 +852,6 @@ int arch_domain_create(struct domain *d,
     }
     else if ( is_pv_domain(d) )
     {
-        mapcache_domain_init(d);
-
         if ( (rc = pv_domain_initialise(d)) != 0 )
             goto fail;
     }
diff --git a/xen/arch/x86/domain_page.c b/xen/arch/x86/domain_page.c
index eac5e3304f..55e337aaf7 100644
--- a/xen/arch/x86/domain_page.c
+++ b/xen/arch/x86/domain_page.c
@@ -82,11 +82,11 @@ void *map_domain_page(mfn_t mfn)
 #endif
 
     v = mapcache_current_vcpu();
-    if ( !v || !is_pv_vcpu(v) )
+    if ( !v )
         return mfn_to_virt(mfn_x(mfn));
 
-    dcache = &v->domain->arch.pv.mapcache;
-    vcache = &v->arch.pv.mapcache;
+    dcache = &v->domain->arch.mapcache;
+    vcache = &v->arch.mapcache;
     if ( !dcache->inuse )
         return mfn_to_virt(mfn_x(mfn));
 
@@ -187,14 +187,14 @@ void unmap_domain_page(const void *ptr)
     ASSERT(va >= MAPCACHE_VIRT_START && va < MAPCACHE_VIRT_END);
 
     v = mapcache_current_vcpu();
-    ASSERT(v && is_pv_vcpu(v));
+    ASSERT(v);
 
-    dcache = &v->domain->arch.pv.mapcache;
+    dcache = &v->domain->arch.mapcache;
     ASSERT(dcache->inuse);
 
     idx = PFN_DOWN(va - MAPCACHE_VIRT_START);
     mfn = l1e_get_pfn(MAPCACHE_L1ENT(idx));
-    hashent = &v->arch.pv.mapcache.hash[MAPHASH_HASHFN(mfn)];
+    hashent = &v->arch.mapcache.hash[MAPHASH_HASHFN(mfn)];
 
     local_irq_save(flags);
 
@@ -233,11 +233,9 @@ void unmap_domain_page(const void *ptr)
 
 int mapcache_domain_init(struct domain *d)
 {
-    struct mapcache_domain *dcache = &d->arch.pv.mapcache;
+    struct mapcache_domain *dcache = &d->arch.mapcache;
     unsigned int bitmap_pages;
 
-    ASSERT(is_pv_domain(d));
-
 #ifdef NDEBUG
     if ( !mem_hotplug && max_page <= PFN_DOWN(__pa(HYPERVISOR_VIRT_END - 1)) )
         return 0;
@@ -261,12 +259,12 @@ int mapcache_domain_init(struct domain *d)
 int mapcache_vcpu_init(struct vcpu *v)
 {
     struct domain *d = v->domain;
-    struct mapcache_domain *dcache = &d->arch.pv.mapcache;
+    struct mapcache_domain *dcache = &d->arch.mapcache;
     unsigned long i;
     unsigned int ents = d->max_vcpus * MAPCACHE_VCPU_ENTRIES;
     unsigned int nr = PFN_UP(BITS_TO_LONGS(ents) * sizeof(long));
 
-    if ( !is_pv_vcpu(v) || !dcache->inuse )
+    if ( !dcache->inuse )
         return 0;
 
     if ( ents > dcache->entries )
@@ -293,7 +291,7 @@ int mapcache_vcpu_init(struct vcpu *v)
     BUILD_BUG_ON(MAPHASHENT_NOTINUSE < MAPCACHE_ENTRIES);
     for ( i = 0; i < MAPHASH_ENTRIES; i++ )
     {
-        struct vcpu_maphash_entry *hashent = &v->arch.pv.mapcache.hash[i];
+        struct vcpu_maphash_entry *hashent = &v->arch.mapcache.hash[i];
 
         hashent->mfn = ~0UL; /* never valid to map */
         hashent->idx = MAPHASHENT_NOTINUSE;
diff --git a/xen/arch/x86/include/asm/domain.h b/xen/arch/x86/include/asm/domain.h
index 4d97c68028..85b890b2cb 100644
--- a/xen/arch/x86/include/asm/domain.h
+++ b/xen/arch/x86/include/asm/domain.h
@@ -286,9 +286,6 @@ struct pv_domain
     /* Mitigate L1TF with shadow/crashing? */
     bool check_l1tf;
 
-    /* map_domain_page() mapping cache. */
-    struct mapcache_domain mapcache;
-
     struct cpuidmasks *cpuidmasks;
 };
 
@@ -327,6 +324,9 @@ struct arch_domain
 
     uint8_t spec_ctrl_flags; /* See SCF_DOM_MASK */
 
+    /* map_domain_page() mapping cache. */
+    struct mapcache_domain mapcache;
+
     union {
         struct pv_domain pv;
         struct hvm_domain hvm;
@@ -517,9 +517,6 @@ struct arch_domain
 
 struct pv_vcpu
 {
-    /* map_domain_page() mapping cache. */
-    struct mapcache_vcpu mapcache;
-
     unsigned int vgc_flags;
 
     struct trap_info *trap_ctxt;
@@ -619,6 +616,9 @@ struct arch_vcpu
 #define async_exception_state(t) async_exception_state[(t)-1]
     uint8_t async_exception_mask;
 
+    /* map_domain_page() mapping cache. */
+    struct mapcache_vcpu mapcache;
+
     /* Virtual Machine Extensions */
     union {
         struct pv_vcpu pv;
-- 
2.40.1