[Xen-changelog] [mini-os master] Save/Restore Support: Refactor trap_init() and setup vector callbacks

[patchbot@xxxxxxx]

commit 29a343da9f9ec0723b74015234869a00df18db27
Author:     Bruno Alvisio <bruno.alvisio@xxxxxxxxx>
AuthorDate: Wed Dec 13 16:30:10 2017 -0800
Commit:     Wei Liu <wei.liu2@xxxxxxxxxx>
CommitDate: Wed Mar 21 09:16:49 2018 +0000

    Save/Restore Support: Refactor trap_init() and setup vector callbacks
    
    Currently the setup of the IDT and the request to set the HVM vector 
callbacks
    are performed both in the trap_init function.
    
    As part of the post-suspend operation, the HVM vector callback needs to be 
setup
    again while the IDT does not. Thus, the trap_init function is split into two
    separate functions: trap_init (sets up IDT) and xen_callback_vector (sets 
the
    HVM vector callback). During the post-suspend operations the 
xen_callback_vector
    function will be invoked.
    
    Signed-off-by: Bruno Alvisio <bruno.alvisio@xxxxxxxxx>
    Reviewed-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
---
 arch/x86/traps.c | 17 +++++++++++------
 include/x86/os.h |  3 +++
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/arch/x86/traps.c b/arch/x86/traps.c
index aa17da3..a7388a5 100644
--- a/arch/x86/traps.c
+++ b/arch/x86/traps.c
@@ -389,6 +389,16 @@ static void setup_gate(unsigned int entry, void *addr, 
unsigned int dpl)
 #endif
 }
 
+void xen_callback_vector(void)
+{
+    if (hvm_set_parameter(HVM_PARAM_CALLBACK_IRQ,
+                         (2ULL << 56) | TRAP_xen_callback))
+    {
+        xprintk("Request for Xen HVM callback vector failed\n");
+        do_exit();
+    }
+}
+
 void trap_init(void)
 {
     setup_gate(TRAP_divide_error, &divide_error, 0);
@@ -415,12 +425,7 @@ void trap_init(void)
     gdt[GDTE_TSS] = (typeof(*gdt))INIT_GDTE((unsigned long)&tss, 0x67, 0x89);
     asm volatile ("ltr %w0" :: "rm" (GDTE_TSS * 8));
 
-    if ( hvm_set_parameter(HVM_PARAM_CALLBACK_IRQ,
-                           (2ULL << 56) | TRAP_xen_callback) )
-    {
-        xprintk("Request for Xen HVM callback vector failed\n");
-        do_exit();
-    }
+    xen_callback_vector();
 }
 
 void trap_fini(void)
diff --git a/include/x86/os.h b/include/x86/os.h
index fbc2eeb..d155914 100644
--- a/include/x86/os.h
+++ b/include/x86/os.h
@@ -67,6 +67,9 @@ extern shared_info_t *HYPERVISOR_shared_info;
 
 void trap_init(void);
 void trap_fini(void);
+#ifndef CONFIG_PARAVIRT
+void xen_callback_vector(void);
+#endif
 
 void arch_fini(void);
 
--
generated by git-patchbot for /home/xen/git/mini-os.git#master

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