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Re: [PATCH 2/2] x86/boot: Support the watchdog on newer AMD systems
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 19 Mar 2024 17:51:30 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 19 Mar 2024 16:51:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 19.03.2024 15:48, Andrew Cooper wrote:
> The MSRs used by setup_k7_watchdog() are architectural in 64bit. The Unit
> Select (0x76, cycles not in halt state) isn't, but it hasn't changed in 23
> years, making this a trend likely to continue.
>
> Drop the family check. If the Unit Select does happen to change meaning in
> the future, check_nmi_watchdog() will still notice the watchdog not operating
> as expected.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> --- a/xen/arch/x86/nmi.c
> +++ b/xen/arch/x86/nmi.c
> @@ -387,15 +387,12 @@ void setup_apic_nmi_watchdog(void)
> if ( nmi_watchdog == NMI_NONE )
> return;
>
> - switch (boot_cpu_data.x86_vendor) {
> + switch ( boot_cpu_data.x86_vendor )
> + {
> case X86_VENDOR_AMD:
> - switch (boot_cpu_data.x86) {
> - case 6:
Just to mention it - this case label has been dead code anyway for about 10
years.
Jan
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