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[Xen-devel] Re: linux-next: build failure after merge of the final tree (xen tree related)
On 07/26/2010 03:43 AM, Stefano Stabellini wrote:
On Mon, 26 Jul 2010, Stephen Rothwell wrote:
Hi all,
After merging the final tree, today's linux-next build (i386 defconfig)
failed like this:
arch/x86/built-in.o: In function `init_hypervisor_platform':
(.init.text+0x3ca4): undefined reference to `x86_hyper_xen_hvm'
arch/x86/built-in.o: In function `init_hypervisor_platform':
(.init.text+0x3cad): undefined reference to `x86_hyper_xen_hvm'
Caused by commit bee6ab53e652a414af20392899879b58cd80d033 ("x86: early PV
on HVM features initialization").
I reverted commit 4b9100d12d15c0eaf23d9edc86228e1bdf452dc2 ("Merge branch
'upstream/pvhvm' into upstream/xen") for today (since there were
dependencies on the above commit).
The problem is that x86_hyper_xen_hvm is in arch/x86/xen/enlighten.c,
that is compiled only when CONFIG_XEN is enabled.
The appended patch fixes the issue moving x86_hyper_xen_hvm to
arch/x86/kernel/cpu/xen.c that is always compiled.
An shorter alternative solution would be just to ifdef CONFIG_XEN
x86_hyper_xen_hvm in arch/x86/kernel/cpu/hypervisor.c.
Seems like the most sensible thing to do. What's the point in detecting
Xen if we don't have CONFIG_XEN enabled?
J
Signed-off-by: Stefano Stabellini<stefano.stabellini@xxxxxxxxxxxxx>
---
diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile
index 5e3a351..25d2e82 100644
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -15,6 +15,7 @@ CFLAGS_common.o := $(nostackp)
obj-y := intel_cacheinfo.o scattered.o topology.o
obj-y += proc.o capflags.o powerflags.o common.o
obj-y += vmware.o hypervisor.o sched.o mshyperv.o
+obj-y += xen.o
obj-$(CONFIG_X86_32) += bugs.o cmpxchg.o
obj-$(CONFIG_X86_64) += bugs_64.o
diff --git a/arch/x86/kernel/cpu/xen.c b/arch/x86/kernel/cpu/xen.c
new file mode 100644
index 0000000..b879de5
--- /dev/null
+++ b/arch/x86/kernel/cpu/xen.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2010, Citrix Systems
+ * Author : Stefano Stabellini<stefano.stabellini@xxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include<linux/init.h>
+#include<asm/x86_init.h>
+#include<asm/hypervisor.h>
+#include<asm/processor.h>
+#include<xen/xen.h>
+
+uint32_t xen_cpuid_base(void)
+{
+ uint32_t base, eax, ebx, ecx, edx;
+ char signature[13];
+
+ for (base = 0x40000000; base< 0x40010000; base += 0x100) {
+ cpuid(base,&eax,&ebx,&ecx,&edx);
+ *(uint32_t *)(signature + 0) = ebx;
+ *(uint32_t *)(signature + 4) = ecx;
+ *(uint32_t *)(signature + 8) = edx;
+ signature[12] = 0;
+
+ if (!strcmp("XenVMMXenVMM", signature)&& ((eax - base)>= 2))
+ return base;
+ }
+
+ return 0;
+}
+
+static void __init __xen_hvm_guest_init(void)
+{
+ xen_hvm_guest_init();
+}
+
+static bool __init xen_hvm_platform(void)
+{
+ if (xen_pv_domain())
+ return false;
+
+ if (!xen_cpuid_base())
+ return false;
+
+ return true;
+}
+
+const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = {
+ .name = "Xen HVM",
+ .detect = xen_hvm_platform,
+ .init_platform = __xen_hvm_guest_init,
+};
+EXPORT_SYMBOL(x86_hyper_xen_hvm);
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 75b479a..06f954d 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1205,25 +1205,6 @@ asmlinkage void __init xen_start_kernel(void)
#endif
}
-static uint32_t xen_cpuid_base(void)
-{
- uint32_t base, eax, ebx, ecx, edx;
- char signature[13];
-
- for (base = 0x40000000; base< 0x40010000; base += 0x100) {
- cpuid(base,&eax,&ebx,&ecx,&edx);
- *(uint32_t *)(signature + 0) = ebx;
- *(uint32_t *)(signature + 4) = ecx;
- *(uint32_t *)(signature + 8) = edx;
- signature[12] = 0;
-
- if (!strcmp("XenVMMXenVMM", signature)&& ((eax - base)>= 2))
- return base;
- }
-
- return 0;
-}
-
static int init_hvm_pv_info(int *major, int *minor)
{
uint32_t eax, ebx, ecx, edx, pages, msr, base;
@@ -1300,7 +1281,7 @@ static struct notifier_block __cpuinitdata
xen_hvm_cpu_notifier = {
.notifier_call = xen_hvm_cpu_notify,
};
-static void __init xen_hvm_guest_init(void)
+void __init xen_hvm_guest_init(void)
{
int r;
int major, minor;
@@ -1320,21 +1301,3 @@ static void __init xen_hvm_guest_init(void)
xen_hvm_init_time_ops();
xen_hvm_init_mmu_ops();
}
-
-static bool __init xen_hvm_platform(void)
-{
- if (xen_pv_domain())
- return false;
-
- if (!xen_cpuid_base())
- return false;
-
- return true;
-}
-
-const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = {
- .name = "Xen HVM",
- .detect = xen_hvm_platform,
- .init_platform = xen_hvm_guest_init,
-};
-EXPORT_SYMBOL(x86_hyper_xen_hvm);
diff --git a/include/xen/xen.h b/include/xen/xen.h
index a164024..dfc2784 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -9,9 +9,12 @@ enum xen_domain_type {
#ifdef CONFIG_XEN
extern enum xen_domain_type xen_domain_type;
+extern void __init xen_hvm_guest_init(void);
#else
#define xen_domain_type XEN_NATIVE
+#define xen_hvm_guest_init() do { } while (0)
#endif
+extern uint32_t xen_cpuid_base(void);
#define xen_domain() (xen_domain_type != XEN_NATIVE)
#define xen_pv_domain() (xen_domain()&& \
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