Re: [kvm-ppc-devel] [kvm-devel] [PATCH] Move kvm_get_pit to

[Hollis Blanchard <hollisb@us.ibm.com>]

Avi, please apply the patch at the end of this mail.

On Tue, 2008-03-11 at 15:17 -0500, Jerone Young wrote:
> # HG changeset patch
> # User Jerone Young <jyoung5@us.ibm.com>
> # Date 1205266548 18000
> # Branch merge
> # Node ID b136c0450c0f7c6ff2262437b1beb9896b1585e3
> # Parent  c14fbbaee36241aa0fab0d6391e47cf9f4ac8012
> Move kvm_get_pit to libkvm.c common code
> 
> This fixes compilation issues for PowerPC and other non x86 archs that
> do not
> have in kernel pit. The pit code is added into the kvm_context in
> kvm-common.h &the error causing the issue is coming from a definition
> in qemu. This seems to be the proper fix as there is also a common
> function:
> kvm_irqchip_in_kernel
> for in kernel irq that handles this the same way.
> 
> Signed-off-by: Jerone Young <jyoung5@us.ibm.com>
> 
> diff --git a/libkvm/libkvm-x86.c b/libkvm/libkvm-x86.c
> --- a/libkvm/libkvm-x86.c
> +++ b/libkvm/libkvm-x86.c
> @@ -660,12 +660,3 @@ int kvm_disable_tpr_access_reporting(kvm
>  }
> 
>  #endif
> -
> -int kvm_pit_in_kernel(kvm_context_t kvm)
> -{
> -#ifdef KVM_CAP_PIT
> -	return kvm->pit_in_kernel;
> -#else
> -	return 0;
> -#endif
> -}
> diff --git a/libkvm/libkvm.c b/libkvm/libkvm.c
> --- a/libkvm/libkvm.c
> +++ b/libkvm/libkvm.c
> @@ -962,3 +962,8 @@ int kvm_irqchip_in_kernel(kvm_context_t 
>  {
>      return kvm->irqchip_in_kernel;
>  }
> +
> +int kvm_pit_in_kernel(kvm_context_t kvm)
> +{
> +	return kvm->pit_in_kernel;
> +}
> diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h
> --- a/libkvm/libkvm.h
> +++ b/libkvm/libkvm.h
> @@ -530,6 +530,13 @@ int kvm_set_lapic(kvm_context_t kvm, int
> 
>  #endif
> 
> +/*!
> + * \brief Query wheather in kernel pit is used
> + *
> + *  \param kvm Pointer to the current kvm_context
> + */
> +int kvm_pit_in_kernel(kvm_context_t kvm);
> +
>  #ifdef KVM_CAP_PIT
> 
>  /*!

This doesn't fix libkvm, and qemu is even worse off:

In file included from ../qemu-kvm.h:80,
                 from ../hw/i8254.c:29:
/home/hollisb/source/kvm-userspace-ppc.hg/qemu/../libkvm/libkvm.h:550: warning: "struct kvm_pit_state" declared inside parameter list
/home/hollisb/source/kvm-userspace-ppc.hg/qemu/../libkvm/libkvm.h:550: warning: its scope is only this definition or declaration, which is probably not what you want
/home/hollisb/source/kvm-userspace-ppc.hg/qemu/../libkvm/libkvm.h:561: warning: "struct kvm_pit_state" declared inside parameter list
../hw/i8254.c: In function `kvm_kernel_pit_save_to_user':
../hw/i8254.c:421: error: storage size of 'pit' isn't known
../hw/i8254.c:431: error: dereferencing pointer to incomplete type
[repeated a lot]


The below patch fixes the libkvm.h issue, taking the same approach as
kvm_get/set_lapic() just above it. (I can't say I'm a fan of this
approach, but kvm-userspace is eroding my idealism.)

The qemu breakage is fixed by Anthony's PIT patch that creates
i8254-kvm.c.



Don't compile kvm_*_pit() on architectures whose currently supported
platforms do not contain a PIT.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>

diff --git a/libkvm/libkvm.h b/libkvm/libkvm.h
--- a/libkvm/libkvm.h
+++ b/libkvm/libkvm.h
@@ -539,6 +539,7 @@ int kvm_pit_in_kernel(kvm_context_t kvm)
 
 #ifdef KVM_CAP_PIT
 
+#if defined(__i386__) || defined(__x86_64__) || defined(__ia64__) 
 /*!
  * \brief Get in kernel PIT of the virtual domain
  *
@@ -562,6 +563,8 @@ int kvm_set_pit(kvm_context_t kvm, struc
 
 #endif
 
+#endif
+
 #ifdef KVM_CAP_VAPIC
 
 /*!


-- 
Hollis Blanchard
IBM Linux Technology Center


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