On Tue, Mar 10, 2020 at 01:54:09AM +0200, Liran Alon wrote:
> No functional change.
> This information will be used by following patches.
>
> Reviewed-by: Nikita Leshenko <[email protected]>
> Signed-off-by: Liran Alon <[email protected]>
> ---
> linux-headers/asm-x86/kvm.h | 4 ++++
> target/i386/cpu.h | 1 +
> target/i386/kvm.c | 6 +++---
> 3 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/linux-headers/asm-x86/kvm.h b/linux-headers/asm-x86/kvm.h
> index 503d3f42da16..99eeaaf2f0b4 100644
> --- a/linux-headers/asm-x86/kvm.h
> +++ b/linux-headers/asm-x86/kvm.h
> @@ -446,4 +446,8 @@ struct kvm_pmu_event_filter {
> #define KVM_PMU_EVENT_ALLOW 0
> #define KVM_PMU_EVENT_DENY 1
>
> +/* From arch/x86/kvm/lapic.h */
> +#define KVM_APIC_BUS_CYCLE_NS 1
> +#define KVM_APIC_BUS_FREQUENCY (1000000000ULL / KVM_APIC_BUS_CYCLE_NS)
> +
> #endif /* _ASM_X86_KVM_H */
This header is auto-generated from UAPI - you can't add
your own stuff here.
> diff --git a/target/i386/cpu.h b/target/i386/cpu.h
> index 576f309bbfc8..9c7cd7cde107 100644
> --- a/target/i386/cpu.h
> +++ b/target/i386/cpu.h
> @@ -1580,6 +1580,7 @@ typedef struct CPUX86State {
> bool tsc_valid;
> int64_t tsc_khz;
> int64_t user_tsc_khz; /* for sanity check only */
> + uint64_t apic_bus_freq;
> #if defined(CONFIG_KVM) || defined(CONFIG_HVF)
> void *xsave_buf;
> #endif
> diff --git a/target/i386/kvm.c b/target/i386/kvm.c
> index 69eb43d796e6..00917196dffb 100644
> --- a/target/i386/kvm.c
> +++ b/target/i386/kvm.c
> @@ -1496,6 +1496,8 @@ int kvm_arch_init_vcpu(CPUState *cs)
> }
> }
>
> + env->apic_bus_freq = KVM_APIC_BUS_FREQUENCY;
> +
> /* Paravirtualization CPUIDs */
> r = hyperv_handle_properties(cs, cpuid_data.entries);
> if (r < 0) {
> @@ -1800,9 +1802,7 @@ int kvm_arch_init_vcpu(CPUState *cs)
> c = &cpuid_data.entries[cpuid_i++];
> c->function = KVM_CPUID_SIGNATURE | 0x10;
> c->eax = env->tsc_khz;
> - /* LAPIC resolution of 1ns (freq: 1GHz) is hardcoded in KVM's
> - * APIC_BUS_CYCLE_NS */
> - c->ebx = 1000000;
> + c->ebx = env->apic_bus_freq / 1000; /* Hz to KHz */
> c->ecx = c->edx = 0;
>
> c = cpuid_find_entry(&cpuid_data.cpuid, kvm_base, 0);
> --
> 2.20.1
