Re: [Xen-devel] [PATCH 1/3] vvmx: set vmxon_region_pa of vcpu out of VMX operation to an invalid address

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.12.16 at 13:16, <haozhong.zhang@xxxxxxxxx> wrote:
> --- a/xen/arch/x86/hvm/vmx/vvmx.c
> +++ b/xen/arch/x86/hvm/vmx/vvmx.c
> @@ -32,6 +32,18 @@ static DEFINE_PER_CPU(u64 *, vvmcs_buf);
>  
>  static void nvmx_purge_vvmcs(struct vcpu *v);
>  
> +/*
> + * When a vcpu is out of VMXON region, set its vmxon_region_pa to
> + * INVALID_VMXON_REGION_PA. We cannot use 0, because 0 is also a valid
> + * VMXON region address.
> + */
> +#define INVALID_VMXON_REGION_PA (~0UL)

And btw, having looked at patch 2 - any reason you can't simply
re-use VMCX_EADDR here?

Jan


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