lkml.org 
[lkml]   [2023]   [Apr]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v2 09/11] x86/kvmclock: Use Secure TSC as clock if available
From
On 3/26/23 09:46, Nikunj A Dadhania wrote:
> For AMD SNP guests having Secure TSC enabled, use Secure TSC based
> clocksource instead of kvmclock.

This patch only results in skipping the initialization of KVM clock, it
doesn't cause Secure TSC to be used as the clocksource.

Thanks,
Tom

>
> Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
> ---
> arch/x86/kernel/kvmclock.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
> index 0f35d44c56fe..1be342064851 100644
> --- a/arch/x86/kernel/kvmclock.c
> +++ b/arch/x86/kernel/kvmclock.c
> @@ -288,7 +288,7 @@ void __init kvmclock_init(void)
> {
> u8 flags;
>
> - if (!kvm_para_available() || !kvmclock)
> + if (!kvm_para_available() || !kvmclock || cc_platform_has(CC_ATTR_GUEST_SECURE_TSC))
> return;
>
> if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE2)) {

\
 
 \ /
  Last update: 2023-04-03 23:47    [W:0.408 / U:0.172 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site