2023-04-24 10:20:58

by Saurabh Singh Sengar

Subject: [PATCH] x86/hyperv/vtl: Add noop for realmode pointers

Assign the realmode pointers to noop, instead of NULL to fix kernel panic.

Signed-off-by: Saurabh Sengar <[email protected]>
---
arch/x86/hyperv/hv_vtl.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c
index 1ba5d3b99b16..85d38b9f3586 100644
--- a/arch/x86/hyperv/hv_vtl.c
+++ b/arch/x86/hyperv/hv_vtl.c
@@ -20,6 +20,8 @@ void __init hv_vtl_init_platform(void)
{
pr_info("Linux runs in Hyper-V Virtual Trust Level\n");

+ x86_platform.realmode_reserve = x86_init_noop;
+ x86_platform.realmode_init = x86_init_noop;
x86_init.irqs.pre_vector_init = x86_init_noop;
x86_init.timers.timer_init = x86_init_noop;

--
2.34.1

2023-05-01 17:17:45

by Michael Kelley (LINUX)

Subject: RE: [PATCH] x86/hyperv/vtl: Add noop for realmode pointers

From: Saurabh Sengar <[email protected]> Sent: Monday, April 24, 2023 3:10 AM
>
> Assign the realmode pointers to noop, instead of NULL to fix kernel panic.
>
> Signed-off-by: Saurabh Sengar <[email protected]>
> ---
> arch/x86/hyperv/hv_vtl.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c
> index 1ba5d3b99b16..85d38b9f3586 100644
> --- a/arch/x86/hyperv/hv_vtl.c
> +++ b/arch/x86/hyperv/hv_vtl.c
> @@ -20,6 +20,8 @@ void __init hv_vtl_init_platform(void)
> {
> pr_info("Linux runs in Hyper-V Virtual Trust Level\n");
>
> + x86_platform.realmode_reserve = x86_init_noop;
> + x86_platform.realmode_init = x86_init_noop;
> x86_init.irqs.pre_vector_init = x86_init_noop;
> x86_init.timers.timer_init = x86_init_noop;
>
> --
> 2.34.1

Reviewed-by: Michael Kelley <[email protected]>

2023-05-08 17:05:34

by Wei Liu

Subject: Re: [PATCH] x86/hyperv/vtl: Add noop for realmode pointers

On Mon, May 01, 2023 at 04:57:56PM +0000, Michael Kelley (LINUX) wrote:
> From: Saurabh Sengar <[email protected]> Sent: Monday, April 24, 2023 3:10 AM
> >
> > Assign the realmode pointers to noop, instead of NULL to fix kernel panic.
> >
> > Signed-off-by: Saurabh Sengar <[email protected]>
> > ---
> > arch/x86/hyperv/hv_vtl.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/arch/x86/hyperv/hv_vtl.c b/arch/x86/hyperv/hv_vtl.c
> > index 1ba5d3b99b16..85d38b9f3586 100644
> > --- a/arch/x86/hyperv/hv_vtl.c
> > +++ b/arch/x86/hyperv/hv_vtl.c
> > @@ -20,6 +20,8 @@ void __init hv_vtl_init_platform(void)
> > {
> > pr_info("Linux runs in Hyper-V Virtual Trust Level\n");
> >
> > + x86_platform.realmode_reserve = x86_init_noop;
> > + x86_platform.realmode_init = x86_init_noop;
> > x86_init.irqs.pre_vector_init = x86_init_noop;
> > x86_init.timers.timer_init = x86_init_noop;
> >
> > --
> > 2.34.1
>
> Reviewed-by: Michael Kelley <[email protected]>
>

Applied to hyperv-fixes. Thanks.