From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Thu, 22 Feb 2018 17:21:34 +0000 (+0000)
Subject: x86/apic: Set SPIV.EN in apic_init() so the device is ready for use
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=e5a9c74084130f8e23bc457b98b4084d2dcacd58;p=people%2Fandrewcoop%2Fxen-test-framework.git

x86/apic: Set SPIV.EN in apic_init() so the device is ready for use

This is more useful behaviour than forcing all tests which call apic_init() to
set up SPIV themselves to actually receive interrupts.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---

diff --git a/arch/x86/apic.c b/arch/x86/apic.c
index 4e7b5b6..4bd8f94 100644
--- a/arch/x86/apic.c
+++ b/arch/x86/apic.c
@@ -88,6 +88,12 @@ int apic_init(enum apic_mode mode)
         cur_apic_mode = mode;
     }
 
+    /*
+     * Enable the APIC.  Use 0xff for the spurious vector, not that we expect
+     * to see any.
+     */
+    apic_write(APIC_SPIV, APIC_SPIV_APIC_ENABLED | 0xff);
+
     return 0;
 }
 
diff --git a/arch/x86/include/arch/apic.h b/arch/x86/include/arch/apic.h
index 1389f70..9279e6c 100644
--- a/arch/x86/include/arch/apic.h
+++ b/arch/x86/include/arch/apic.h
@@ -18,6 +18,9 @@
 /* Local APIC register definitions. */
 #define APIC_ID         0x020
 #define APIC_LVR        0x030
+#define APIC_SPIV       0x0f0
+#define   APIC_SPIV_APIC_ENABLED  0x00100
+
 #define APIC_ICR        0x300
 #define   APIC_DM_NMI             0x00400
 #define   APIC_ICR_BUSY           0x01000