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| author | Huacai Chen <chenhuacai@loongson.cn> | 2025-05-14 22:17:52 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-05-22 14:29:44 +0200 |
| commit | 2135336574354e1de870015e2b39b5b793f131cb (patch) | |
| tree | 587e3295f3fa62f322784c393d86fa0929fbaea8 /rust/helpers | |
| parent | 66a309b4d5bdbe59b53957246fe87af1c95a6691 (diff) | |
LoongArch: Save and restore CSR.CNTC for hibernation
commit ceb9155d058a11242aa0572875c44e9713b1a2be upstream.
Save and restore CSR.CNTC for hibernation which is similar to suspend.
For host this is unnecessary because sched clock is ensured continuous,
but for kvm guest sched clock isn't enough because rdtime.d should also
be continuous.
Host::rdtime.d = Host::CSR.CNTC + counter
Guest::rdtime.d = Host::CSR.CNTC + Host::CSR.GCNTC + Guest::CSR.CNTC + counter
so,
Guest::rdtime.d = Host::rdtime.d + Host::CSR.GCNTC + Guest::CSR.CNTC
To ensure Guest::rdtime.d continuous, Host::rdtime.d should be at first
continuous, while Host::CSR.GCNTC / Guest::CSR.CNTC is maintained by KVM.
Cc: stable@vger.kernel.org
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'rust/helpers')
0 files changed, 0 insertions, 0 deletions