x86/apic: allow enabling x2APIC mode regardless of interrupt remapping

x2APIC mode doesn't mandate interrupt remapping, and hence can be
enabled independently. This patch enables x2APIC when available,
regardless of whether there's interrupt remapping support.

This is beneficial specially when running on virtualized environments,
since it reduces the amount of vmexits. For example when sending an
IPI in xAPIC mode Xen performs at least 3 different accesses to the
APIC MMIO region, while when using x2APIC mode a single wrmsr is used.

The following numbers are from a lock profiling of a Xen PV shim
running a Linux PV kernel with 32 vCPUs and xAPIC mode:

(XEN) Global lock flush_lock: addr=ffff82d0804af1c0, lockval=03190319, not locked
(XEN)   lock:656153(892606463454), block:602183(9495067321843)

Average lock time:   1360363ns
Average block time: 15767743ns

While the following are from the same configuration but with the shim
using x2APIC mode:

(XEN) Global lock flush_lock: addr=ffff82d0804b01c0, lockval=1adb1adb, not locked
(XEN)   lock:1841883(1375128998543), block:1658716(10193054890781)

Average lock time:   746588ns
Average block time: 6145147ns

Enabling x2APIC has halved the average lock time, thus reducing
contention.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/arch/x86/apic.c b/xen/arch/x86/apic.c
index a8ee18636f4c2eddd8829f971ec29eb2e598a46a..50f3d305e80e953e86fdf64b7dc272f883975fb7 100644 (file)
--- a/xen/arch/x86/apic.c
+++ b/xen/arch/x86/apic.c
@@ -44,6 +44,8 @@ static bool __read_mostly tdt_enabled;
 static bool __initdata tdt_enable = true;
 boolean_param("tdt", tdt_enable);
 
+static bool __read_mostly iommu_x2apic_enabled;
+
 static struct {
     int active;
     /* r/w apic fields */
@@ -492,7 +494,8 @@ static void __enable_x2apic(void)
 
 static void resume_x2apic(void)
 {
-    iommu_enable_x2apic();
+    if ( iommu_x2apic_enabled )
+        iommu_enable_x2apic();
     __enable_x2apic();
 }
 
@@ -695,7 +698,8 @@ int lapic_suspend(void)
 
     local_irq_save(flags);
     disable_local_APIC();
-    iommu_disable_x2apic();
+    if ( iommu_x2apic_enabled )
+        iommu_disable_x2apic();
     local_irq_restore(flags);
     return 0;
 }
@@ -860,7 +864,6 @@ void __init x2apic_bsp_setup(void)
 {
     struct IO_APIC_route_entry **ioapic_entries = NULL;
     const char *orig_name;
-    bool intremap_enabled;
 
     if ( !cpu_has_x2apic )
         return;
@@ -875,56 +878,46 @@ void __init x2apic_bsp_setup(void)
         printk("x2APIC: Already enabled by BIOS: Ignoring cmdline disable.\n");
     }
 
-    if ( !iommu_supports_x2apic() )
+    if ( iommu_supports_x2apic() )
     {
-        if ( !x2apic_enabled )
+        if ( (ioapic_entries = alloc_ioapic_entries()) == NULL )
         {
-            printk("Not enabling x2APIC: depends on IOMMU support\n");
-            return;
+            printk("Allocate ioapic_entries failed\n");
+            goto out;
         }
-        panic("x2APIC: already enabled by BIOS, but no IOMMU support\n");
-    }
-
-    if ( (ioapic_entries = alloc_ioapic_entries()) == NULL )
-    {
-        printk("Allocate ioapic_entries failed\n");
-        goto out;
-    }
 
-    if ( save_IO_APIC_setup(ioapic_entries) )
-    {
-        printk("Saving IO-APIC state failed\n");
-        goto out;
-    }
+        if ( save_IO_APIC_setup(ioapic_entries) )
+        {
+            printk("Saving IO-APIC state failed\n");
+            goto out;
+        }
 
-    mask_8259A();
-    mask_IO_APIC_setup(ioapic_entries);
+        mask_8259A();
+        mask_IO_APIC_setup(ioapic_entries);
 
-    switch ( iommu_enable_x2apic() )
-    {
-    case 0:
-        intremap_enabled = true;
-        break;
-    case -ENXIO: /* ACPI_DMAR_X2APIC_OPT_OUT set */
-        if ( !x2apic_enabled )
+        switch ( iommu_enable_x2apic() )
         {
+        case 0:
+            iommu_x2apic_enabled = true;
+            break;
+
+        case -ENXIO: /* ACPI_DMAR_X2APIC_OPT_OUT set */
+            if ( x2apic_enabled )
+                panic("IOMMU requests xAPIC mode, but x2APIC already enabled by firmware\n");
+
             printk("Not enabling x2APIC (upon firmware request)\n");
-            intremap_enabled = false;
+            iommu_x2apic_enabled = false;
             goto restore_out;
+
+        default:
+            printk(XENLOG_ERR "Failed to enable Interrupt Remapping\n");
+            iommu_x2apic_enabled = false;
+            break;
         }
-        /* fall through */
-    default:
-        if ( x2apic_enabled )
-            panic("Interrupt remapping could not be enabled while "
-                  "x2APIC is already enabled by BIOS\n");
-
-        printk(XENLOG_ERR
-               "Failed to enable Interrupt Remapping: Will not enable x2APIC.\n");
-        intremap_enabled = false;
-        goto restore_out;
-    }
 
-    force_iommu = 1;
+        if ( iommu_x2apic_enabled )
+            force_iommu = 1;
+    }
 
     if ( !x2apic_enabled )
     {
@@ -938,13 +931,17 @@ void __init x2apic_bsp_setup(void)
         printk("Switched to APIC driver %s\n", genapic.name);
 
 restore_out:
-    /*
-     * NB: do not use raw mode when restoring entries if the iommu has been
-     * enabled during the process, because the entries need to be translated
-     * and added to the remapping table in that case.
-     */
-    restore_IO_APIC_setup(ioapic_entries, !intremap_enabled);
-    unmask_8259A();
+    /* iommu_x2apic_enabled cannot be used here in the error case. */
+    if ( iommu_supports_x2apic() )
+    {
+        /*
+         * NB: do not use raw mode when restoring entries if the iommu has
+         * been enabled during the process, because the entries need to be
+         * translated and added to the remapping table in that case.
+         */
+        restore_IO_APIC_setup(ioapic_entries, !iommu_x2apic_enabled);
+        unmask_8259A();
+    }
 
 out:
     if ( ioapic_entries )