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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v2] x86: wrap kexec feature with CONFIG_KEXEC
Add the appropriate #if checks around the kexec code in the x86 codebase
so that the feature can actually be turned off by the flag instead of
always required to be enabled on x86.
Signed-off-by: Jonathan Creekmore <jonathan.creekmore@xxxxxxxxx>
---
Changed since v1:
* Reorder kexec files to be alphabetical in the makefile
* Create macros for the kexec functions that are called when disabled
* #define the kexec hypercalls to do_ni_hypercall when disabled
* Remove unnecessary macro duplication
* Remove unrelated whitespace changes
---
xen/arch/x86/Makefile | 4 ++--
xen/arch/x86/setup.c | 25 +++++++++++++------------
xen/arch/x86/x86_64/compat/entry.S | 4 ++++
xen/arch/x86/x86_64/entry.S | 4 ++++
xen/include/xen/kexec.h | 11 +++++++++++
5 files changed, 34 insertions(+), 14 deletions(-)
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index 5f24951..2fc7f97 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -14,6 +14,7 @@ obj-bin-y += bzimage.init.o
obj-bin-y += clear_page.o
obj-bin-y += copy_page.o
obj-y += compat.o
+obj-$(HAS_KEXEC) += crash.o
obj-y += debug.o
obj-y += delay.o
obj-bin-y += dmi_scan.init.o
@@ -31,6 +32,7 @@ obj-y += io_apic.o
obj-y += msi.o
obj-y += ioport_emulate.o
obj-y += irq.o
+obj-$(HAS_KEXEC) += machine_kexec.o
obj-y += microcode_amd.o
obj-y += microcode_intel.o
# This must come after the vendor specific files.
@@ -56,8 +58,6 @@ obj-y += trace.o
obj-y += traps.o
obj-y += usercopy.o
obj-y += x86_emulate.o
-obj-y += machine_kexec.o
-obj-y += crash.o
obj-y += tboot.o
obj-y += hpet.o
obj-y += vm_event.o
diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
index ff34670..333ba82 100644
--- a/xen/arch/x86/setup.c
+++ b/xen/arch/x86/setup.c
@@ -481,8 +481,8 @@ static void __init parse_video_info(void)
static void __init kexec_reserve_area(struct e820map *e820)
{
- unsigned long kdump_start = kexec_crash_area.start;
- unsigned long kdump_size = kexec_crash_area.size;
+ unsigned long kdump_start = get_kexec_crash_area_start();
+ unsigned long kdump_size = get_kexec_crash_area_size();
static bool_t __initdata is_reserved = 0;
kdump_size = (kdump_size + PAGE_SIZE - 1) & PAGE_MASK;
@@ -496,7 +496,8 @@ static void __init kexec_reserve_area(struct e820map *e820)
{
printk("Kdump: DISABLED (failed to reserve %luMB (%lukB) at %#lx)"
"\n", kdump_size >> 20, kdump_size >> 10, kdump_start);
- kexec_crash_area.start = kexec_crash_area.size = 0;
+ set_kexec_crash_area_start(0);
+ set_kexec_crash_area_size(0);
}
else
{
@@ -974,12 +975,12 @@ void __init noreturn __start_xen(unsigned long mbi_p)
}
/* Don't overlap with modules. */
- e = consider_modules(s, e, PAGE_ALIGN(kexec_crash_area.size),
+ e = consider_modules(s, e, PAGE_ALIGN(get_kexec_crash_area_size()),
mod, mbi->mods_count, -1);
- if ( !kexec_crash_area.start && (s < e) )
+ if ( !get_kexec_crash_area_start() && (s < e) )
{
- e = (e - kexec_crash_area.size) & PAGE_MASK;
- kexec_crash_area.start = e;
+ e = (e - get_kexec_crash_area_size()) & PAGE_MASK;
+ set_kexec_crash_area_start(e);
}
}
@@ -1125,14 +1126,14 @@ void __init noreturn __start_xen(unsigned long mbi_p)
PFN_UP(mod[i].mod_end), PAGE_HYPERVISOR);
}
- if ( kexec_crash_area.size )
+ if ( get_kexec_crash_area_size() )
{
- unsigned long s = PFN_DOWN(kexec_crash_area.start);
- unsigned long e = min(s + PFN_UP(kexec_crash_area.size),
+ unsigned long s = PFN_DOWN(get_kexec_crash_area_start());
+ unsigned long e = min(s + PFN_UP(get_kexec_crash_area_size()),
PFN_UP(__pa(HYPERVISOR_VIRT_END - 1)));
- if ( e > s )
- map_pages_to_xen((unsigned long)__va(kexec_crash_area.start),
+ if ( e > s )
+ map_pages_to_xen((unsigned long)__va(get_kexec_crash_area_start()),
s, e - s, PAGE_HYPERVISOR);
}
diff --git a/xen/arch/x86/x86_64/compat/entry.S
b/xen/arch/x86/x86_64/compat/entry.S
index 1521779..fbe4885 100644
--- a/xen/arch/x86/x86_64/compat/entry.S
+++ b/xen/arch/x86/x86_64/compat/entry.S
@@ -12,6 +12,10 @@
#include <public/xen.h>
#include <irq_vectors.h>
+#ifndef CONFIG_KEXEC
+#define compat_kexec_op do_ni_hypercall
+#endif
+
ENTRY(compat_hypercall)
ASM_CLAC
pushq $0
diff --git a/xen/arch/x86/x86_64/entry.S b/xen/arch/x86/x86_64/entry.S
index 74677a2..a8815a7 100644
--- a/xen/arch/x86/x86_64/entry.S
+++ b/xen/arch/x86/x86_64/entry.S
@@ -13,6 +13,10 @@
#include <public/xen.h>
#include <irq_vectors.h>
+#ifndef CONFIG_KEXEC
+#define do_kexec_op do_ni_hypercall
+#endif
+
/* %rbx: struct vcpu */
ENTRY(switch_to_kernel)
leaq VCPU_trap_bounce(%rbx),%rdx
diff --git a/xen/include/xen/kexec.h b/xen/include/xen/kexec.h
index b7d121d..dface92 100644
--- a/xen/include/xen/kexec.h
+++ b/xen/include/xen/kexec.h
@@ -18,6 +18,9 @@ extern xen_kexec_reserve_t kexec_crash_area;
extern bool_t kexecing;
void set_kexec_crash_area_size(u64 system_ram);
+#define get_kexec_crash_area_size() kexec_crash_area.size
+#define set_kexec_crash_area_start(x) kexec_crash_area.start = (x)
+#define get_kexec_crash_area_start() kexec_crash_area.start
/* We have space for 4 images to support atomic update
* of images. This is important for CRASH images since
@@ -79,6 +82,14 @@ void vmcoreinfo_append_str(const char *fmt, ...)
#else /* !CONFIG_KEXEC */
#define crashinfo_maxaddr_bits 0
+#define kexecing 0
+#define kexec_early_calculations()
+#define kexec_crash()
+#define kexec_crash_save_cpu()
+#define set_kexec_crash_area_size(system_ram)
+#define get_kexec_crash_area_size() 0
+#define set_kexec_crash_area_start(x)
+#define get_kexec_crash_area_start() 0
#endif
--
2.1.4
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