[Xen-devel] [PATCH v4] x86/mem_access: Deprecate the HVM mem_access ops

[Aravindh Puthiyaparambil <aravindp@xxxxxxxxx>]

This patch does the following:
1. Deprecate the HVMOP_[sg]et_mem_access HVM ops.
2. Remove the enums and structs associated with the HVM ops.

Signed-off-by: Aravindh Puthiyaparambil <aravindp@xxxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>

---
All other patches in the "Make mem_access APIs and hypercalls generic"
series have been acked, so this is now being submitted separately. This
needs to go in after other patches in the series have been applied.

Changes from version v3:
Remove the HVM ops completely from do_hvm_op() so that they are handled
by the default case.

Changes from version v2:
This was part of "x86/mem_access: Make the mem_access ops generic" in
the earlier versions of the series and is now a seperate patch.

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index d19d994..a4cb80f 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -4580,83 +4580,6 @@ long do_hvm_op(unsigned long op, 
XEN_GUEST_HANDLE_PARAM(void) arg)
         break;
     }
 
-    case HVMOP_set_mem_access:
-    {
-        struct xen_hvm_set_mem_access a;
-        struct domain *d;
-
-        if ( copy_from_guest(&a, arg, 1) )
-            return -EFAULT;
-
-        rc = rcu_lock_remote_domain_by_id(a.domid, &d);
-        if ( rc != 0 )
-            return rc;
-
-        rc = -EINVAL;
-        if ( !is_hvm_domain(d) )
-            goto param_fail5;
-
-        rc = xsm_hvm_param(XSM_TARGET, d, op);
-        if ( rc )
-            goto param_fail5;
-
-        rc = -EINVAL;
-        if ( (a.first_pfn != ~0ull) &&
-             (a.nr < start_iter ||
-              ((a.first_pfn + a.nr - 1) < a.first_pfn) ||
-              ((a.first_pfn + a.nr - 1) > domain_get_maximum_gpfn(d))) )
-            goto param_fail5;
-            
-        rc = p2m_set_mem_access(d, a.first_pfn, a.nr, start_iter,
-                                HVMOP_op_mask, a.hvmmem_access);
-        if ( rc > 0 )
-        {
-            start_iter = rc;
-            rc = -EAGAIN;
-        }
-
-    param_fail5:
-        rcu_unlock_domain(d);
-        break;
-    }
-
-    case HVMOP_get_mem_access:
-    {
-        struct xen_hvm_get_mem_access a;
-        struct domain *d;
-        xenmem_access_t access;
-
-        if ( copy_from_guest(&a, arg, 1) )
-            return -EFAULT;
-
-        rc = rcu_lock_remote_domain_by_id(a.domid, &d);
-        if ( rc != 0 )
-            return rc;
-
-        rc = -EINVAL;
-        if ( !is_hvm_domain(d) )
-            goto param_fail6;
-
-        rc = xsm_hvm_param(XSM_TARGET, d, op);
-        if ( rc )
-            goto param_fail6;
-
-        rc = -EINVAL;
-        if ( (a.pfn > domain_get_maximum_gpfn(d)) && a.pfn != ~0ull )
-            goto param_fail6;
-
-        rc = p2m_get_mem_access(d, a.pfn, &access);
-        if ( rc != 0 )
-            goto param_fail6;
-
-        a.hvmmem_access = access;
-        rc = __copy_to_guest(arg, &a, 1) ? -EFAULT : 0;
-
-    param_fail6:
-        rcu_unlock_domain(d);
-        break;
-    }
-
     case HVMOP_pagetable_dying:
     {
         struct xen_hvm_pagetable_dying a;
diff --git a/xen/include/public/hvm/hvm_op.h b/xen/include/public/hvm/hvm_op.h
index 3204ec4..f00f6d2 100644
--- a/xen/include/public/hvm/hvm_op.h
+++ b/xen/include/public/hvm/hvm_op.h
@@ -162,49 +162,11 @@ DEFINE_XEN_GUEST_HANDLE(xen_hvm_xentrace_t);
 /* Following tools-only interfaces may change in future. */
 #if defined(__XEN__) || defined(__XEN_TOOLS__)
 
+/* Deprecated by XENMEM_access_op_set_access */
 #define HVMOP_set_mem_access        12
-typedef enum {
-    HVMMEM_access_n,
-    HVMMEM_access_r,
-    HVMMEM_access_w,
-    HVMMEM_access_rw,
-    HVMMEM_access_x,
-    HVMMEM_access_rx,
-    HVMMEM_access_wx,
-    HVMMEM_access_rwx,
-    HVMMEM_access_rx2rw,       /* Page starts off as r-x, but automatically
-                                * change to r-w on a write */
-    HVMMEM_access_n2rwx,       /* Log access: starts off as n, automatically 
-                                * goes to rwx, generating an event without
-                                * pausing the vcpu */
-    HVMMEM_access_default      /* Take the domain default */
-} hvmmem_access_t;
-/* Notify that a region of memory is to have specific access types */
-struct xen_hvm_set_mem_access {
-    /* Domain to be updated. */
-    domid_t domid;
-    /* Memory type */
-    uint16_t hvmmem_access; /* hvm_access_t */
-    /* Number of pages, ignored on setting default access */
-    uint32_t nr;
-    /* First pfn, or ~0ull to set the default access for new pages */
-    uint64_aligned_t first_pfn;
-};
-typedef struct xen_hvm_set_mem_access xen_hvm_set_mem_access_t;
-DEFINE_XEN_GUEST_HANDLE(xen_hvm_set_mem_access_t);
 
+/* Deprecated by XENMEM_access_op_get_access */
 #define HVMOP_get_mem_access        13
-/* Get the specific access type for that region of memory */
-struct xen_hvm_get_mem_access {
-    /* Domain to be queried. */
-    domid_t domid;
-    /* Memory type: OUT */
-    uint16_t hvmmem_access; /* hvm_access_t */
-    /* pfn, or ~0ull for default access for new pages.  IN */
-    uint64_aligned_t pfn;
-};
-typedef struct xen_hvm_get_mem_access xen_hvm_get_mem_access_t;
-DEFINE_XEN_GUEST_HANDLE(xen_hvm_get_mem_access_t);
 
 #define HVMOP_inject_trap            14
 /* Inject a trap into a VCPU, which will get taken up on the next
-- 
1.8.3.2


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