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Subject[PATCH 35 of 36] x86_64/paravirt: add adjust_exception_frame
Date
From
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>
---
arch/x86/kernel/asm-offsets_64.c | 1 +
arch/x86/kernel/entry_64.S | 2 ++
arch/x86/kernel/paravirt.c | 3 +++
arch/x86/xen/enlighten.c | 3 +++
include/asm-x86/paravirt.h | 9 +++++++++
include/asm-x86/processor.h | 2 ++
6 files changed, 20 insertions(+)
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -61,6 +61,7 @@
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_nmi_return, pv_cpu_ops, nmi_return);
OFFSET(PV_CPU_usergs_sysret32, pv_cpu_ops, usergs_sysret32);
diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
--- a/arch/x86/kernel/entry_64.S
+++ b/arch/x86/kernel/entry_64.S
@@ -864,6 +864,7 @@
*/
.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 */
@@ -876,6 +877,7 @@

.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
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -298,6 +298,9 @@
.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 = {
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1121,6 +1121,9 @@
.irq_enable = xen_irq_enable,
.safe_halt = xen_safe_halt,
.halt = xen_halt,
+#ifdef CONFIG_X86_64
+ .adjust_exception_frame = paravirt_nop,
+#endif
};

static const struct pv_apic_ops xen_apic_ops __initdata = {
diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -192,6 +192,10 @@
void (*irq_enable)(void);
void (*safe_halt)(void);
void (*halt)(void);
+
+#ifdef CONFIG_X86_64
+ void (*adjust_exception_frame)(void);
+#endif
};

struct pv_apic_ops {
@@ -1551,6 +1555,11 @@
movq %rax, %rcx; \
xorq %rax, %rax;

+#define PARAVIRT_ADJUST_EXCEPTION_FRAME \
+ PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
+ CLBR_NONE, \
+ call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))
+
#define USERGS_SYSRET64 \
PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64), \
CLBR_NONE, \
diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h
--- a/include/asm-x86/processor.h
+++ b/include/asm-x86/processor.h
@@ -542,6 +542,8 @@

#define set_iopl_mask native_set_iopl_mask
#define SWAPGS swapgs
+
+#define PARAVIRT_ADJUST_EXCEPTION_FRAME /* */
#endif /* CONFIG_PARAVIRT */

/*



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