linux-kernel - Re: Current kernel fails to compile with KVM on PowerPC

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Date:	Sat, 24 Dec 2011 18:05:21 +0100
From:	Alexander Graf <agraf@...e.de>
To:	Jörg Sommer <joerg@...a.gnuu.de>
Cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	kvm list <kvm@...r.kernel.org>, kvm-ppc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: Current kernel fails to compile with KVM on PowerPC


On 24.12.2011, at 12:13, Jörg Sommer wrote:

> Jörg Sommer hat am Sat 24. Dec, 11:31 (+0100) geschrieben:
>> Alexander Graf hat am Fri 23. Dec, 14:50 (+0100) geschrieben:
>>> On 20.12.2011, at 21:27, Jörg Sommer wrote:
>>>> Jörg Sommer hat am Mon 07. Nov, 20:48 (+0100) geschrieben:
>>>>> CHK     include/linux/version.h
>>>>> HOSTCC  scripts/mod/modpost.o
>>>>> CHK     include/generated/utsrelease.h
>>>>> UPD     include/generated/utsrelease.h
>>>>> HOSTLD  scripts/mod/modpost
>>>>> GEN     include/generated/bounds.h
>>>>> CC      arch/powerpc/kernel/asm-offsets.s
>>>>> In file included from arch/powerpc/kernel/asm-offsets.c:59:0:
>>>>> /home/joerg/git/linux/arch/powerpc/include/asm/kvm_book3s.h: In function ‘compute_tlbie_rb’:
>>>>> /home/joerg/git/linux/arch/powerpc/include/asm/kvm_book3s.h:393:10: error: ‘HPTE_V_SECONDARY’ undeclared (first use in this function)
>>>>> /home/joerg/git/linux/arch/powerpc/include/asm/kvm_book3s.h:393:10: note: each undeclared identifier is reported only once for each function it appears in
>>>>> /home/joerg/git/linux/arch/powerpc/include/asm/kvm_book3s.h:396:12: error: ‘HPTE_V_1TB_SEG’ undeclared (first use in this function)
>>>>> /home/joerg/git/linux/arch/powerpc/include/asm/kvm_book3s.h:401:10: error: ‘HPTE_V_LARGE’ undeclared (first use in this function)
>>>>> /home/joerg/git/linux/arch/powerpc/include/asm/kvm_book3s.h:415:2: warning: right shift count >= width of type [enabled by default]
>>>>> make[3]: *** [arch/powerpc/kernel/asm-offsets.s] Fehler 1
>>>>> make[2]: *** [prepare0] Fehler 2
>>>>> make[1]: *** [deb-pkg] Fehler 2
>>>>> make: *** [deb-pkg] Fehler 2
>>>> 
>>>> I'm so sorry to have to report a new bug in one of your patches. It was
>>>> covered by the one above. I've picked the commit for it from your git
>>>> repository and now, the kernel build fails with this error:
>>>> 
>>>> BOOTCC  arch/powerpc/boot/fdt_strerror.o
>>>> BOOTAR  arch/powerpc/boot/wrapper.a
>>>> WRAP    arch/powerpc/boot/zImage.pmac
>>>> WRAP    arch/powerpc/boot/zImage.coff
>>>> ERROR: "kvmppc_h_pr" [arch/powerpc/kvm/kvm.ko] undefined!
>>>> make[3]: *** [__modpost] Fehler 1
>>>> make[2]: *** [modules] Fehler 2
>>>> make[2]: *** Warte auf noch nicht beendete Prozesse...
>>>> WRAP    arch/powerpc/boot/zImage.miboot
>>>> make[1]: *** [deb-pkg] Fehler 2
>>>> make: *** [deb-pkg] Fehler 2
>>> 
>>> This is odd. kvmppc_h_pr shouldn't be accessed when not in book3s_64_pr mode:
>>> 
>>> #ifdef CONFIG_KVM_BOOK3S_64_PR
>>>                        if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
>>>                                r = RESUME_GUEST;
>>>                                break;
>>>                        }
>>> #endif
> 
> Is this the change you've thought of?
> 
> commit b8624f11e94dd9c2280cb01bf2ede31e4316477d
> Author: Jörg Sommer <joerg@...a.gnuu.de>
> Date:   Sat Dec 24 12:03:03 2011 +0100
> 
>    KVM: PPC: Use kvmppc_h_pr only if it's available
> 
>    The function kvmppc_h_pr() is only available when the config option
>    CONFIG_KVM_BOOK3S_64_PR is set, which is not the case for 32-bit PowerPCs
>    for example. Building the kernel for these systems failed, because the
>    symbol could not be resolved.
> 
>    ERROR: "kvmppc_h_pr" [arch/powerpc/kvm/kvm.ko] undefined!
> 
>    Signed-off-by: Jörg Sommer <joerg@...a.gnuu.de>
> 
> diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
> index 4b0f01b..eddab24 100644
> --- a/arch/powerpc/kvm/book3s_pr.c
> +++ b/arch/powerpc/kvm/book3s_pr.c
> @@ -677,10 +677,12 @@ program_interrupt:
> 			ulong cmd = kvmppc_get_gpr(vcpu, 3);
> 			int i;
> 
> +#ifdef CONFIG_KVM_BOOK3S_64_PR
> 			if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
> 				r = RESUME_GUEST;
> 				break;
> 			}
> +#endif
> 
> 			run->papr_hcall.nr = cmd;
> 			for (i = 0; i < 9; ++i) {


I was actually thinking of:

commit dfc209648daf8ba4197e71376b76c95fd26fd272
Author: Andreas Schwab <schwab@...ux-m68k.org>
Date:   Tue Nov 8 07:17:39 2011 +0000

    KVM: PPC: protect use of kvmppc_h_pr
    
    kvmppc_h_pr is only available if CONFIG_KVM_BOOK3S_64_PR.
    
    Signed-off-by: Andreas Schwab <schwab@...ux-m68k.org>
    Signed-off-by: Alexander Graf <agraf@...e.de>

diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 72559b0..aaefe19 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -660,10 +660,12 @@ program_interrupt:
                        ulong cmd = kvmppc_get_gpr(vcpu, 3);
                        int i;
 
+#ifdef CONFIG_KVM_BOOK3S_64_PR
                        if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
                                r = RESUME_GUEST;
                                break;
                        }
+#endif
 
                        run->papr_hcall.nr = cmd;
                        for (i = 0; i < 9; ++i) {

But yes :). I guess we need to make sure this commit also lands in 3.2 :(.


Alex

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