xen: move VCPUOP_register_vcpu_info to common code

Move the implementation of VCPUOP_register_vcpu_info from x86 specific
to commmon code.

Move vcpu_info_mfn from an arch specific vcpu sub-field to the common
vcpu struct.
Move the initialization of vcpu_info_mfn to common code.

Move unmap_vcpu_info and the call to unmap_vcpu_info at domain
destruction time to common code.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Keir Fraser <keir@xen.org>

1 files changed, 0 insertions, 113 deletions

diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index db1e65dd26..0228db2ad9 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -385,8 +385,6 @@ int vcpu_initialise(struct vcpu *v)
 
     vmce_init_vcpu(v);
 
-    v->arch.vcpu_info_mfn = INVALID_MFN;
-
     if ( is_hvm_domain(d) )
     {
         rc = hvm_vcpu_initialise(v);
@@ -960,99 +958,6 @@ int arch_vcpu_reset(struct vcpu *v)
     return 0;
 }
 
-/* 
- * Unmap the vcpu info page if the guest decided to place it somewhere
- * else.  This is only used from arch_domain_destroy, so there's no
- * need to do anything clever.
- */
-static void
-unmap_vcpu_info(struct vcpu *v)
-{
-    unsigned long mfn;
-
-    if ( v->arch.vcpu_info_mfn == INVALID_MFN )
-        return;
-
-    mfn = v->arch.vcpu_info_mfn;
-    unmap_domain_page_global(v->vcpu_info);
-
-    v->vcpu_info = &dummy_vcpu_info;
-    v->arch.vcpu_info_mfn = INVALID_MFN;
-
-    put_page_and_type(mfn_to_page(mfn));
-}
-
-/* 
- * Map a guest page in and point the vcpu_info pointer at it.  This
- * makes sure that the vcpu_info is always pointing at a valid piece
- * of memory, and it sets a pending event to make sure that a pending
- * event doesn't get missed.
- */
-static int
-map_vcpu_info(struct vcpu *v, unsigned long gfn, unsigned offset)
-{
-    struct domain *d = v->domain;
-    void *mapping;
-    vcpu_info_t *new_info;
-    struct page_info *page;
-    int i;
-
-    if ( offset > (PAGE_SIZE - sizeof(vcpu_info_t)) )
-        return -EINVAL;
-
-    if ( v->arch.vcpu_info_mfn != INVALID_MFN )
-        return -EINVAL;
-
-    /* Run this command on yourself or on other offline VCPUS. */
-    if ( (v != current) && !test_bit(_VPF_down, &v->pause_flags) )
-        return -EINVAL;
-
-    page = get_page_from_gfn(d, gfn, NULL, P2M_ALLOC);
-    if ( !page )
-        return -EINVAL;
-
-    if ( !get_page_type(page, PGT_writable_page) )
-    {
-        put_page(page);
-        return -EINVAL;
-    }
-
-    mapping = __map_domain_page_global(page);
-    if ( mapping == NULL )
-    {
-        put_page_and_type(page);
-        return -ENOMEM;
-    }
-
-    new_info = (vcpu_info_t *)(mapping + offset);
-
-    if ( v->vcpu_info == &dummy_vcpu_info )
-    {
-        memset(new_info, 0, sizeof(*new_info));
-        __vcpu_info(v, new_info, evtchn_upcall_mask) = 1;
-    }
-    else
-    {
-        memcpy(new_info, v->vcpu_info, sizeof(*new_info));
-    }
-
-    v->vcpu_info = new_info;
-    v->arch.vcpu_info_mfn = page_to_mfn(page);
-
-    /* Set new vcpu_info pointer /before/ setting pending flags. */
-    wmb();
-
-    /*
-     * Mark everything as being pending just to make sure nothing gets
-     * lost.  The domain will get a spurious event, but it can cope.
-     */
-    vcpu_info(v, evtchn_upcall_pending) = 1;
-    for ( i = 0; i < BITS_PER_EVTCHN_WORD(d); i++ )
-        set_bit(i, &vcpu_info(v, evtchn_pending_sel));
-
-    return 0;
-}
-
 long
 arch_do_vcpu_op(
     int cmd, struct vcpu *v, XEN_GUEST_HANDLE_PARAM(void) arg)
@@ -1089,22 +994,6 @@ arch_do_vcpu_op(
         break;
     }
 
-    case VCPUOP_register_vcpu_info:
-    {
-        struct domain *d = v->domain;
-        struct vcpu_register_vcpu_info info;
-
-        rc = -EFAULT;
-        if ( copy_from_guest(&info, arg, 1) )
-            break;
-
-        domain_lock(d);
-        rc = map_vcpu_info(v, info.mfn, info.offset);
-        domain_unlock(d);
-
-        break;
-    }
-
     /*
      * XXX Disable for 4.0.0: __update_vcpu_system_time() writes to the given
      * virtual address even when running in another domain's address space.
@@ -1971,8 +1860,6 @@ int domain_relinquish_resources(struct domain *d)
             ret = vcpu_destroy_pagetables(v);
             if ( ret )
                 return ret;
-
-            unmap_vcpu_info(v);
         }
 
         if ( !is_hvm_domain(d) )