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[PATCH] x86/DM: slightly simplify set_mem_type()


  • To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Tue, 25 Feb 2025 16:00:05 +0100
  • Autocrypt: addr=jbeulich@xxxxxxxx; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL
  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Tue, 25 Feb 2025 15:00:12 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

There's no need to access the static array twice per iteration, even
more so when that's effectively open-coding array_access_nospec().
Along with renaming the "new type" variable, rename the "old type" one
as well, to clarify which one is which.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/hvm/dm.c
+++ b/xen/arch/x86/hvm/dm.c
@@ -219,7 +219,8 @@ static int set_mem_type(struct domain *d
                         struct xen_dm_op_set_mem_type *data)
 {
     xen_pfn_t last_pfn = data->first_pfn + data->nr - 1;
-    unsigned int iter = 0, mem_type;
+    unsigned int iter = 0;
+    p2m_type_t nt;
     int rc = 0;
 
     /* Interface types to internal p2m types */
@@ -239,16 +240,16 @@ static int set_mem_type(struct domain *d
          unlikely(data->mem_type == HVMMEM_unused) )
         return -EINVAL;
 
-    mem_type = array_index_nospec(data->mem_type, ARRAY_SIZE(memtype));
+    nt = array_access_nospec(memtype, data->mem_type);
 
-    if ( mem_type == HVMMEM_ioreq_server )
+    if ( nt == p2m_ioreq_server )
     {
         unsigned int flags;
 
         if ( !hap_enabled(d) )
             return -EOPNOTSUPP;
 
-        /* Do not change to HVMMEM_ioreq_server if no ioreq server mapped. */
+        /* Do not change to p2m_ioreq_server if no ioreq server mapped. */
         if ( !p2m_get_ioreq_server(d, &flags) )
             return -EINVAL;
     }
@@ -256,22 +257,22 @@ static int set_mem_type(struct domain *d
     while ( iter < data->nr )
     {
         unsigned long pfn = data->first_pfn + iter;
-        p2m_type_t t;
+        p2m_type_t ot;
 
-        get_gfn_unshare(d, pfn, &t);
-        if ( p2m_is_paging(t) )
+        get_gfn_unshare(d, pfn, &ot);
+        if ( p2m_is_paging(ot) )
         {
             put_gfn(d, pfn);
             p2m_mem_paging_populate(d, _gfn(pfn));
             return -EAGAIN;
         }
 
-        if ( p2m_is_shared(t) )
+        if ( p2m_is_shared(ot) )
             rc = -EAGAIN;
-        else if ( !allow_p2m_type_change(t, memtype[mem_type]) )
+        else if ( !allow_p2m_type_change(ot, nt) )
             rc = -EINVAL;
         else
-            rc = p2m_change_type_one(d, pfn, t, memtype[mem_type]);
+            rc = p2m_change_type_one(d, pfn, ot, nt);
 
         put_gfn(d, pfn);
 



 


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