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Re: [Xen-devel] [PATCH v4 7/8] x86: be more verbose when running on a hypervisor


  • To: Wei Liu <wl@xxxxxxx>, Xen Development List <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Fri, 29 Nov 2019 18:15:52 +0000
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  • Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <liuwe@xxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Michael Kelley <mikelley@xxxxxxxxxxxxx>
  • Delivery-date: Fri, 29 Nov 2019 18:16:21 +0000
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 21/11/2019 18:50, Wei Liu wrote:
> Also replace xen_guest with running_on_hypervisor boolean.

I agree with dropping xen_guest, but...

>
> Signed-off-by: Wei Liu <liuwe@xxxxxxxxxxxxx>
> ---
> Changes in v4:
> 1. Access ->name directly.
> 2. Drop Roger's review tag.
> ---
>  xen/arch/x86/setup.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/xen/arch/x86/setup.c b/xen/arch/x86/setup.c
> index 19606d909b..123436b35a 100644
> --- a/xen/arch/x86/setup.c
> +++ b/xen/arch/x86/setup.c
> @@ -689,6 +689,7 @@ void __init noreturn __start_xen(unsigned long mbi_p)
>      int i, j, e820_warn = 0, bytes = 0;
>      bool acpi_boot_table_init_done = false, relocated = false;
>      int ret;
> +    bool running_on_hypervisor;

... this is semantically ambiguous with cpu_has_hypervisor.

Where they differ is whether Xen has managed to recognise the hypervisor
it is running under, or not.

Given that the hypervisor_*() hooks are nops by default, I'd suggest
just making blind calls.

~Andrew

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