Re: [PATCH 04/04] qemu-kvm: other archs should maintain memory mapping

Jes Sorensen wrote:
> Avi Kivity wrote:
>>> Currently, use TARGET_I386 to comment out the mapping machanism
>>> for other archs, but mapping machanism should be useful for other archs
>>> to maintain guest's memory mapping. 
>>
>> Hollis, does this work for you?
>>
>> If now, you can add a new define KVM_WANT_MAPPING or something, and 
>> define it for I386 and IA64.
>
> Hi,
>
> This is the must_use_alias patch mentioned in my previous email.


> +int destroy_region_works = 0;
> +
>   

Global name, prefix with kvm_.  Does it actually need to be global?

>  
> Index: qemu-kvm/target-i386/qemu-kvm-arch.h
> =================================> --- /dev/null
> +++ qemu-kvm/target-i386/qemu-kvm-arch.h
> @@ -0,0 +1,17 @@
> +/*
> + * qemu/kvm x86 integration
> + *
> + * Copyright (C) 2006-2008 Qumranet Technologies
> + * Copyright (C) 2009 Silicon Graphics Inc.
> + *
> + * Licensed under the terms of the GNU GPL version 2 or higher.
> + */
> +#ifndef QEMU_KVM_ARCH_H
> +#define QEMU_KVM_ARCH_H
> +
> +extern int destroy_region_works;
> +
> +extern int kvm_arch_must_use_aliases_source(target_phys_addr_t addr);
> +extern int kvm_arch_must_use_aliases_target(target_phys_addr_t addr);
>   

The header depends on target_phys_addr_t, so it must include whatever 
defines it.

> --- /dev/null
> +++ qemu-kvm/target-ia64/qemu-kvm-arch.h
> @@ -0,0 +1,22 @@
> +/*
> + * qemu/kvm ia64 integration
> + *
> + * Copyright (C) 2006-2008 Qumranet Technologies
> + * Copyright (C) 2009 Silicon Graphics Inc.
> + *
> + * Licensed under the terms of the GNU GPL version 2 or higher.
> + */
> +#ifndef QEMU_KVM_ARCH_H
> +#define QEMU_KVM_ARCH_H
> +
> +static inline int kvm_arch_must_use_aliases_source(target_phys_addr_t addr)
> +{
> +    return 0;
> +}
> +
> +static inline int kvm_arch_must_use_aliases_target(target_phys_addr_t addr)
> +{
> +    return 0;
> +}
> +
> +#endif
>   

Missing other archs...

Instead of duplicating this for every arch, you can have a #define that 
tells you if you want non-trivial arch definitions, and supply the 
trivial definitions in qemu-kvm.h.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.