[Xen-devel] [PATCH for-next 6/8] x86/domain: factor out pv_domain_initialise

[Wei Liu <wei.liu2@xxxxxxxxxx>]

Lump everything PV related in arch_domain_create into
pv_domain_initialise.

Though domcr_flags is not necessary, the new function is given one to
match hvm counterpart.

Since it cleans up after itself there is no need to clean up in
arch_domain_create in case of failure.

No functional change.

Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 xen/arch/x86/domain.c | 97 +++++++++++++++++++++++++++++++--------------------
 1 file changed, 60 insertions(+), 37 deletions(-)

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 05885a103d..ed16adf77a 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -533,6 +533,58 @@ static void pv_domain_destroy(struct domain *d)
     free_xenheap_page(d->arch.pv_domain.gdt_ldt_l1tab);
 }
 
+static int pv_domain_initialise(struct domain *d, unsigned int domcr_flags)
+{
+    static const struct arch_csw pv_csw = {
+        .from = paravirt_ctxt_switch_from,
+        .to   = paravirt_ctxt_switch_to,
+        .tail = continue_nonidle_domain,
+    };
+    int rc = -ENOMEM;
+
+    d->arch.pv_domain.gdt_ldt_l1tab =
+        alloc_xenheap_pages(0, MEMF_node(domain_to_node(d)));
+    if ( !d->arch.pv_domain.gdt_ldt_l1tab )
+        goto fail;
+    clear_page(d->arch.pv_domain.gdt_ldt_l1tab);
+
+    if ( levelling_caps & ~LCAP_faulting )
+    {
+        d->arch.pv_domain.cpuidmasks = xmalloc(struct cpuidmasks);
+        if ( !d->arch.pv_domain.cpuidmasks )
+            goto fail;
+        *d->arch.pv_domain.cpuidmasks = cpuidmask_defaults;
+    }
+
+    rc = create_perdomain_mapping(d, GDT_LDT_VIRT_START,
+                                  GDT_LDT_MBYTES << (20 - PAGE_SHIFT),
+                                  NULL, NULL);
+    if ( rc )
+        goto fail;
+
+    d->arch.ctxt_switch = &pv_csw;
+
+    /* 64-bit PV guest by default. */
+    d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 0;
+
+    return 0;
+
+fail:
+    if ( d->arch.pv_domain.gdt_ldt_l1tab )
+    {
+        free_xenheap_page(d->arch.pv_domain.gdt_ldt_l1tab);
+        d->arch.pv_domain.gdt_ldt_l1tab = NULL;
+    }
+
+    if ( d->arch.pv_domain.cpuidmasks )
+    {
+        xfree(d->arch.pv_domain.cpuidmasks);
+        d->arch.pv_domain.cpuidmasks = NULL;
+    }
+
+    return rc;
+}
+
 int arch_domain_create(struct domain *d, unsigned int domcr_flags,
                        struct xen_arch_domainconfig *config)
 {
@@ -593,30 +645,7 @@ int arch_domain_create(struct domain *d, unsigned int 
domcr_flags,
         d->arch.emulation_flags = emflags;
     }
 
-    if ( is_idle_domain(d) )
-        rc = 0;
-    else
-    {
-        d->arch.pv_domain.gdt_ldt_l1tab =
-            alloc_xenheap_pages(0, MEMF_node(domain_to_node(d)));
-        if ( !d->arch.pv_domain.gdt_ldt_l1tab )
-            goto fail;
-        clear_page(d->arch.pv_domain.gdt_ldt_l1tab);
-
-        if ( levelling_caps & ~LCAP_faulting )
-        {
-            d->arch.pv_domain.cpuidmasks = xmalloc(struct cpuidmasks);
-            if ( !d->arch.pv_domain.cpuidmasks )
-                goto fail;
-            *d->arch.pv_domain.cpuidmasks = cpuidmask_defaults;
-        }
-
-        rc = create_perdomain_mapping(d, GDT_LDT_VIRT_START,
-                                      GDT_LDT_MBYTES << (20 - PAGE_SHIFT),
-                                      NULL, NULL);
-    }
-    if ( rc )
-        goto fail;
+    rc = 0;
 
     mapcache_domain_init(d);
 
@@ -665,23 +694,20 @@ int arch_domain_create(struct domain *d, unsigned int 
domcr_flags,
         if ( (rc = hvm_domain_initialise(d, domcr_flags)) != 0 )
             goto fail;
     }
-    else
+    else if ( is_idle_domain(d) )
     {
-        static const struct arch_csw pv_csw = {
-            .from = paravirt_ctxt_switch_from,
-            .to   = paravirt_ctxt_switch_to,
-            .tail = continue_nonidle_domain,
-        };
         static const struct arch_csw idle_csw = {
             .from = paravirt_ctxt_switch_from,
             .to   = paravirt_ctxt_switch_to,
             .tail = continue_idle_domain,
         };
 
-        d->arch.ctxt_switch = is_idle_domain(d) ? &idle_csw : &pv_csw;
-
-        /* 64-bit PV guest by default. */
-        d->arch.is_32bit_pv = d->arch.has_32bit_shinfo = 0;
+        d->arch.ctxt_switch = &idle_csw;
+    }
+    else
+    {
+        if ( (rc = pv_domain_initialise(d, domcr_flags)) != 0 )
+            goto fail;
     }
 
     /* initialize default tsc behavior in case tools don't */
@@ -709,9 +735,6 @@ int arch_domain_create(struct domain *d, unsigned int 
domcr_flags,
     if ( paging_initialised )
         paging_final_teardown(d);
     free_perdomain_mappings(d);
-    if ( is_pv_domain(d) )
-        pv_domain_destroy(d);
-
     return rc;
 }
 
-- 
2.11.0


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