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Date: Mon, 26 Jul 2010 10:25:25 -0700
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: Stefano Stabellini <stefano.stabellini@...citrix.com>
CC: Stephen Rothwell <sfr@...b.auug.org.au>,
Xen Devel <Xen-devel@...ts.xensource.com>,
"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Sheng Yang <sheng@...ux.intel.com>
Subject: 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@...citrix.com>
>
> ---
>
> 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@...citrix.com>
> + *
> + * 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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