[PATCH] EDAC/amd64: Do not load EDAC driver when running as a guest

[PATCH] EDAC/amd64: Do not load EDAC driver when running as a guest

[Jack Wang]

Similar to commit f0a029fff4a5 ("EDAC/Intel: Do not load EDAC driver when running as a guest")

There's little to no point in loading an EDAC driver running in a guest.

Add a check in each of the Intel EDAC drivers for X86_FEATURE_HYPERVISOR
and simply return -ENODEV in the init routine.

Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
---
 drivers/edac/amd64_edac.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index f0d8f60acee1..cdb14575ef31 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -3942,6 +3942,9 @@ static int __init amd64_edac_init(void)
 	if (owner && strncmp(owner, EDAC_MOD_STR, sizeof(EDAC_MOD_STR)))
 		return -EBUSY;
 
+	if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR))
+		return -ENODEV;
+
 	if (!x86_match_cpu(amd64_cpuids))
 		return -ENODEV;
 
-- 
2.25.1

Re: [PATCH] EDAC/amd64: Do not load EDAC driver when running as a guest

[Borislav Petkov]

On Tue, Jul 06, 2021 at 07:08:33AM +0200, Jack Wang wrote:
> Similar to commit f0a029fff4a5 ("EDAC/Intel: Do not load EDAC driver when running as a guest")
> 
> There's little to no point in loading an EDAC driver running in a guest.
> 
> Add a check in each of the Intel EDAC drivers for X86_FEATURE_HYPERVISOR
> and simply return -ENODEV in the init routine.

Did you even read this sentence before leaving it in the commit message
or you simply copied the commit message of f0a029fff4a5 blindly?

Also:

https://lore.kernel.org/linux-edac/20210628172740.245689-1-Smita.KoralahalliChannabasappa@amd.com/

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

Re: [PATCH] EDAC/amd64: Do not load EDAC driver when running as a guest

[Jinpu Wang]

On Tue, Jul 6, 2021 at 7:34 AM Borislav Petkov <bp@alien8.de> wrote:
>
> On Tue, Jul 06, 2021 at 07:08:33AM +0200, Jack Wang wrote:
> > Similar to commit f0a029fff4a5 ("EDAC/Intel: Do not load EDAC driver when running as a guest")
> >
> > There's little to no point in loading an EDAC driver running in a guest.
> >
> > Add a check in each of the Intel EDAC drivers for X86_FEATURE_HYPERVISOR
> > and simply return -ENODEV in the init routine.
>
> Did you even read this sentence before leaving it in the commit message
> or you simply copied the commit message of f0a029fff4a5 blindly?
sorry, I notice the patch for Intel, and feel we should do the same
for AMD, hence post the patch.
I forgot to adapt the content of the commit message. -.-
>
> Also:
>
> https://lore.kernel.org/linux-edac/20210628172740.245689-1-Smita.KoralahalliChannabasappa@amd.com/
>
Great if it's already in the queue.
> --
> Regards/Gruss,
>     Boris.
>
> https://people.kernel.org/tglx/notes-about-netiquette
Thanks!