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| author | Isaku Yamahata <isaku.yamahata@intel.com> | 2024-04-25 15:06:59 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2024-06-05 06:18:25 -0700 |
| commit | f9e1cbf1805e14688f6175b688c0a8216bf67a11 (patch) | |
| tree | c800a58dcf6eb3afd9b8663d7a785aa21c61360b /arch/x86/kvm/lapic.h | |
| parent | KVM: x86: Move shadow_phys_bits into "kvm_host", as "maxphyaddr" (diff) | |
| download | linux-f9e1cbf1805e14688f6175b688c0a8216bf67a11.tar.gz linux-f9e1cbf1805e14688f6175b688c0a8216bf67a11.zip | |
KVM: x86: hyper-v: Calculate APIC bus frequency for Hyper-V
Remove APIC_BUS_FREQUENCY and calculate it based on nanoseconds per APIC
bus cycle. APIC_BUS_FREQUENCY is used only for HV_X64_MSR_APIC_FREQUENCY.
The MSR is not frequently read, calculate it every time.
There are two constants related to the APIC bus frequency:
APIC_BUS_FREQUENCY and APIC_BUS_CYCLE_NS.
Only one value is required because one can be calculated from the other:
APIC_BUS_CYCLES_NS = 1000 * 1000 * 1000 / APIC_BUS_FREQUENCY.
Remove APIC_BUS_FREQUENCY and instead calculate it when needed.
This prepares for support of configurable APIC bus frequency by
requiring to change only a single variable.
Suggested-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Maxim Levitsky <maximlevitsky@gmail.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
[reinette: rework changelog]
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Link: https://lore.kernel.org/r/76a659d0898e87ebd73ee7c922f984a87a6ab370.1714081726.git.reinette.chatre@intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/lapic.h')
| -rw-r--r-- | arch/x86/kvm/lapic.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h index 0a0ea4b5dd8c..a20cb006b6c8 100644 --- a/arch/x86/kvm/lapic.h +++ b/arch/x86/kvm/lapic.h @@ -17,7 +17,6 @@ #define APIC_DEST_MASK 0x800 #define APIC_BUS_CYCLE_NS 1 -#define APIC_BUS_FREQUENCY (1000000000ULL / APIC_BUS_CYCLE_NS) #define APIC_BROADCAST 0xFF #define X2APIC_BROADCAST 0xFFFFFFFFul |