KVM: x86: pass kvm_get_time_scale arguments in hertz
Prepare for improving the precision in the next patch. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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83326e43f2
Коммит
3ae13faac4
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@ -1203,7 +1203,7 @@ static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
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return dividend;
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}
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static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
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static void kvm_get_time_scale(uint64_t scaled_hz, uint64_t base_hz,
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s8 *pshift, u32 *pmultiplier)
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{
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uint64_t scaled64;
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@ -1211,8 +1211,8 @@ static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
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uint64_t tps64;
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uint32_t tps32;
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tps64 = base_khz * 1000LL;
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scaled64 = scaled_khz * 1000LL;
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tps64 = base_hz;
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scaled64 = scaled_hz;
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while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
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tps64 >>= 1;
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shift--;
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@ -1230,8 +1230,8 @@ static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
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*pshift = shift;
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*pmultiplier = div_frac(scaled64, tps32);
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pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n",
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__func__, base_khz, scaled_khz, shift, *pmultiplier);
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pr_debug("%s: base_hz %llu => %llu, shift %d, mul %u\n",
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__func__, base_hz, scaled_hz, shift, *pmultiplier);
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}
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#ifdef CONFIG_X86_64
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@ -1303,7 +1303,7 @@ static int kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz)
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}
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/* Compute a scale to convert nanoseconds in TSC cycles */
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kvm_get_time_scale(user_tsc_khz, NSEC_PER_SEC / 1000,
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kvm_get_time_scale(user_tsc_khz * 1000LL, NSEC_PER_SEC,
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&vcpu->arch.virtual_tsc_shift,
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&vcpu->arch.virtual_tsc_mult);
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vcpu->arch.virtual_tsc_khz = user_tsc_khz;
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@ -1779,7 +1779,7 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
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tgt_tsc_khz = kvm_scale_tsc(v, tgt_tsc_khz);
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if (unlikely(vcpu->hw_tsc_khz != tgt_tsc_khz)) {
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kvm_get_time_scale(NSEC_PER_SEC / 1000, tgt_tsc_khz,
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kvm_get_time_scale(NSEC_PER_SEC, tgt_tsc_khz * 1000LL,
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&vcpu->hv_clock.tsc_shift,
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&vcpu->hv_clock.tsc_to_system_mul);
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vcpu->hw_tsc_khz = tgt_tsc_khz;
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