On Mon, May 20, 2019 at 9:44 AM Michal Kubecek <mkubecek@xxxxxxx> wrote:
>
> Recently introduced functions kvm_vcpu_map() and kvm_vcpu_unmap() call
> memremap() and memunmap() which are only available if HAS_IOMEM is enabled
> but this dependency is not explicit, so that the build fails with HAS_IOMEM
> disabled.
>
> As both function are only used on x86 where HAS_IOMEM is always enabled,
> the easiest fix seems to be to only provide them when HAS_IOMEM is enabled.
>
> Fixes: e45adf665a53 ("KVM: Introduce a new guest mapping API")
> Signed-off-by: Michal Kubecek <mkubecek@xxxxxxx>
Hi Michal,
I see the same build issue on arm64 and as CONFIG_HAS_IOMEM is set
there this patch has no effect on solving that. Instead I had to
include linux/io.h in kvm_main.c to make it compile.
Regards,
Bjorn
> ---
> include/linux/kvm_host.h | 6 +++++-
> virt/kvm/kvm_main.c | 2 ++
> 2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 79fa4426509c..371d68fef5e1 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -759,9 +759,13 @@ struct kvm_memslots *kvm_vcpu_memslots(struct kvm_vcpu *vcpu);
> struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn);
> kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn);
> kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn);
> +
> +#ifdef CONFIG_HAS_IOMEM
> int kvm_vcpu_map(struct kvm_vcpu *vcpu, gpa_t gpa, struct kvm_host_map *map);
> -struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn);
> void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map, bool dirty);
> +#endif
> +
> +struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn);
> unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn);
> unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable);
> int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data, int offset,
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index f0d13d9d125d..4a2c813e75d6 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -1743,6 +1743,7 @@ struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
> }
> EXPORT_SYMBOL_GPL(gfn_to_page);
>
> +#ifdef CONFIG_HAS_IOMEM
> static int __kvm_map_gfn(struct kvm_memory_slot *slot, gfn_t gfn,
> struct kvm_host_map *map)
> {
> @@ -1806,6 +1807,7 @@ void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map,
> map->page = NULL;
> }
> EXPORT_SYMBOL_GPL(kvm_vcpu_unmap);
> +#endif /* CONFIG_HAS_IOMEM */
>
> struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
> {
> --
> 2.21.0
>
