x86/paravirt, 64-bit: add adjust_exception_frame

64-bit Xen pushes a couple of extra words onto an exception frame.
Add a hook to deal with them.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: xen-devel <xen-devel@lists.xensource.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 6 insertions, 0 deletions

diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
index 06c451af979a..3295e7c08fe7 100644
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -61,6 +61,7 @@ int main(void)
         OFFSET(PARAVIRT_PATCH_pv_irq_ops, paravirt_patch_template, pv_irq_ops);
         OFFSET(PV_IRQ_irq_disable, pv_irq_ops, irq_disable);
         OFFSET(PV_IRQ_irq_enable, pv_irq_ops, irq_enable);
+        OFFSET(PV_IRQ_adjust_exception_frame, pv_irq_ops, adjust_exception_frame);
         OFFSET(PV_CPU_iret, pv_cpu_ops, iret);
         OFFSET(PV_CPU_usergs_sysret32, pv_cpu_ops, usergs_sysret32);
         OFFSET(PV_CPU_usergs_sysret64, pv_cpu_ops, usergs_sysret64);
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
index 880ffe510a11..70fe13a1c41d 100644
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -736,6 +736,7 @@ END(spurious_interrupt)
  */             
         .macro zeroentry sym
         INTR_FRAME
+        PARAVIRT_ADJUST_EXCEPTION_FRAME
         pushq $0        /* push error code/oldrax */ 
         CFI_ADJUST_CFA_OFFSET 8
         pushq %rax      /* push real oldrax to the rdi slot */ 
@@ -748,6 +749,7 @@ END(spurious_interrupt)
 
         .macro errorentry sym
         XCPT_FRAME
+        PARAVIRT_ADJUST_EXCEPTION_FRAME
         pushq %rax
         CFI_ADJUST_CFA_OFFSET 8
         CFI_REL_OFFSET rax,0
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index bf1067e89cad..b20c369cb89d 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -296,6 +296,9 @@ struct pv_irq_ops pv_irq_ops = {
         .irq_enable = native_irq_enable,
         .safe_halt = native_safe_halt,
         .halt = native_halt,
+#ifdef CONFIG_X86_64
+        .adjust_exception_frame = paravirt_nop,
+#endif
 };
 
 struct pv_cpu_ops pv_cpu_ops = {