From patchwork Fri Aug 20 08:07:34 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zachary Amsden X-Patchwork-Id: 120529 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter.kernel.org (8.14.4/8.14.3) with ESMTP id o7K8DFd8003726 for ; Fri, 20 Aug 2010 08:13:15 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752182Ab0HTIJF (ORCPT ); Fri, 20 Aug 2010 04:09:05 -0400 Received: from mx1.redhat.com ([209.132.183.28]:2568 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752150Ab0HTIIv (ORCPT ); Fri, 20 Aug 2010 04:08:51 -0400 Received: from int-mx01.intmail.prod.int.phx2.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o7K88jO4003247 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Fri, 20 Aug 2010 04:08:45 -0400 Received: from mysore (vpn-9-158.rdu.redhat.com [10.11.9.158]) by int-mx01.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o7K87qfE027969; Fri, 20 Aug 2010 04:08:43 -0400 From: Zachary Amsden To: kvm@vger.kernel.org Cc: Zachary Amsden , Avi Kivity , Marcelo Tosatti , Glauber Costa , Thomas Gleixner , John Stultz , linux-kernel@vger.kernel.org Subject: [KVM timekeeping 20/35] Make math work for other scales Date: Thu, 19 Aug 2010 22:07:34 -1000 Message-Id: <1282291669-25709-21-git-send-email-zamsden@redhat.com> In-Reply-To: <1282291669-25709-1-git-send-email-zamsden@redhat.com> References: <1282291669-25709-1-git-send-email-zamsden@redhat.com> X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.3 (demeter.kernel.org [140.211.167.41]); Fri, 20 Aug 2010 08:13:16 +0000 (UTC) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index ce03c2c..718bed9 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -866,31 +866,35 @@ static uint32_t div_frac(uint32_t dividend, uint32_t divisor) return quotient; } -static void kvm_set_time_scale(uint32_t tsc_khz, struct pvclock_vcpu_time_info *hv_clock) +static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz, + s8 *pshift, u32 *pmultiplier) { - uint64_t nsecs = 1000000000LL; + uint64_t scaled64; int32_t shift = 0; uint64_t tps64; uint32_t tps32; - tps64 = tsc_khz * 1000LL; - while (tps64 > nsecs*2) { + tps64 = base_khz * 1000LL; + scaled64 = scaled_khz * 1000LL; + while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000UL) { tps64 >>= 1; shift--; } tps32 = (uint32_t)tps64; - while (tps32 <= (uint32_t)nsecs) { - tps32 <<= 1; + while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000UL) { + if (scaled64 & 0xffffffff00000000UL || tps32 & 0x80000000) + scaled64 >>= 1; + else + tps32 <<= 1; shift++; } - hv_clock->tsc_shift = shift; - hv_clock->tsc_to_system_mul = div_frac(nsecs, tps32); + *pshift = shift; + *pmultiplier = div_frac(scaled64, tps32); - pr_debug("%s: tsc_khz %u, tsc_shift %d, tsc_mul %u\n", - __func__, tsc_khz, hv_clock->tsc_shift, - hv_clock->tsc_to_system_mul); + pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n", + __func__, base_khz, scaled_khz, shift, *pmultiplier); } static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz); @@ -1016,7 +1020,9 @@ static int kvm_write_guest_time(struct kvm_vcpu *v) } if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) { - kvm_set_time_scale(this_tsc_khz, &vcpu->hv_clock); + kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz, + &vcpu->hv_clock.tsc_shift, + &vcpu->hv_clock.tsc_to_system_mul); vcpu->hw_tsc_khz = this_tsc_khz; }