Alexander Graf wrote:
> X86 CPUs need to have some magic happening to enable the
> virtualization
> extensions on them. This magic can result in unpleasant results for
> users, like blocking other VMMs from working (vmx) or using invalid
> TLB
> entries (svm).
>
> Currently KVM activates virtualization when the respective kernel
> module
> is loaded. This blocks us from autoloading KVM modules without
> breaking
> other VMMs.
>
> To circumvent this problem at least a bit, this patch introduces on
> demand activation of virtualization. This means, that instead
> virtualization is enabled on creation of the first virtual machine
> and disabled on removal of the last one.
>
> So using this, KVM can be easily autoloaded, while keeping other
> hypervisors usable.
>
> v2 adds returns to non-x86 hardware_enables and adds IA64 change
>
> Signed-off-by: Alexander Graf <[EMAIL PROTECTED]>
> ---
> arch/ia64/kvm/kvm-ia64.c | 8 +++--
> arch/powerpc/kvm/powerpc.c | 3 +-
> arch/s390/kvm/kvm-s390.c | 3 +-
> arch/x86/kvm/svm.c | 13 +++++--
> arch/x86/kvm/vmx.c | 7 ++++-
> arch/x86/kvm/x86.c | 4 +-
> include/asm-x86/kvm_host.h | 2 +-
> include/linux/kvm_host.h | 2 +-
> virt/kvm/kvm_main.c | 72
> +++++++++++++++++++++++++++++++------------ 9 files changed, 80
> insertions(+), 34 deletions(-)
>
> diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
> index c25c75b..2bd79db 100644
> --- a/arch/ia64/kvm/kvm-ia64.c
> +++ b/arch/ia64/kvm/kvm-ia64.c
> @@ -110,7 +110,7 @@ long ia64_pal_vp_create(u64 *vpd, u64 *host_iva,
> u64 *opt_handler)
>
> static DEFINE_SPINLOCK(vp_lock);
>
> -void kvm_arch_hardware_enable(void *garbage)
> +int kvm_arch_hardware_enable(void *garbage)
> {
> long status;
> long tmp_base;
> @@ -124,7 +124,7 @@ void kvm_arch_hardware_enable(void *garbage)
> slot = ia64_itr_entry(0x3, KVM_VMM_BASE, pte, KVM_VMM_SHIFT);
> local_irq_restore(saved_psr);
> if (slot < 0)
> - return;
> + return -ENOMEM;
Return -EINVAL maybe more accurate. Here slot < 0 means invalid or uncorrect
parameters are passed to ia64_itr_entry.
Xiantao
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