From patchwork Thu Jul 29 00:10:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Upton X-Patchwork-Id: 12407095 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 623E9C4320A for ; Thu, 29 Jul 2021 00:10:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4A5056103E for ; Thu, 29 Jul 2021 00:10:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232963AbhG2AKa (ORCPT ); Wed, 28 Jul 2021 20:10:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59140 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232954AbhG2AK3 (ORCPT ); Wed, 28 Jul 2021 20:10:29 -0400 Received: from mail-io1-xd49.google.com (mail-io1-xd49.google.com [IPv6:2607:f8b0:4864:20::d49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8969AC061757 for ; Wed, 28 Jul 2021 17:10:26 -0700 (PDT) Received: by mail-io1-xd49.google.com with SMTP id p7-20020a6b63070000b02904f58bb90366so2714550iog.14 for ; Wed, 28 Jul 2021 17:10:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=CDVCMvrwtZsqPckcKTCoPyLzR63dpktWA9Ts6E0Z2d0=; b=Lz5UT1Men1DU80dxF7hLi3JeaAIWaywj2cpwe26ZWQyGJ1U/js0rDU/urQA+DD2p4Q KrxlRtC/lvHcWj//UD2w9C1uCXe/Dofzgp7QhM4Xg0h2pDlYDwwpSE17/37Jdndjabpa 0BYD9paWBxuLR/fhrIePQ+4DwIV8k+Vw+AOstqq3mcFMHqaY3RGOqoEsPlOEMWY8HM5n Z/yRbQ05J3VONnAnp6+X8W090TaAtMI5BecF77uyt9Ic/2JR4xrGCVl4y1FYV+ygicgg +buoJTejAlMgrdZq6SrLpv2D/AoutX+dNrENA6lVmARAgrFrP2rsaB9BA5A1vdtKK6Wb /dWQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=CDVCMvrwtZsqPckcKTCoPyLzR63dpktWA9Ts6E0Z2d0=; b=gmNkFvo01E+jpikM085sG6KiXDtbwa5MrhoZQg8vWaEXeJXUpVfB3QvSLrWV8lA9kG bY9Fss/EtNouZcKa8hdjjWQ06mHOlueG2xaXWfKkJYmfOXEIzo6NoK1TrYEYVZ8tt2IH MsqYQ5FIOwHYM2Oq2N0jdH8DVPOOdqaTq4GMRCJvG0Qr0jzN9DYZxd2riEwBsK07D9d5 B45Jb1+VPjodLL2uBU+Rb/lglBQZOQGVscq4EGWDf1YJHlLMfCMnOYa60WU04CpeLaKm GdaCtyWvgjVPO0L22J2oY4j2V8firtKeM4yHjesgwk+/Qxz9KSp23ysBX/e12CuKWHVj dmLw== X-Gm-Message-State: AOAM5307ON+Xrwl9woU+nUruO5BJSzuu6ips4Ut+il5knHy5C8udBsGH hMAMCi4SDo3eqv4O1dlnXoVUSM/aD2cIf0QudRI+Mxu8Rz1pbXBCGH9OCYO8lu+KS2VvxtC7Lyh jqUgFnXxF/6zd9lsDvk4kTznXSL+x/WPDvZUvS0VDvLhQ/npRQwfTzXY5oA== X-Google-Smtp-Source: ABdhPJzEZr/EMrW/y4RoimJ/e7tg+fbW9O+LZ6/c+F91Tz43P1r23sAiuSqaDMWLJ0mnxDf2sm//gSFCrbA= X-Received: from oupton.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:404]) (user=oupton job=sendgmr) by 2002:a5d:9e4f:: with SMTP id i15mr1699476ioi.58.1627517425910; Wed, 28 Jul 2021 17:10:25 -0700 (PDT) Date: Thu, 29 Jul 2021 00:10:03 +0000 In-Reply-To: <20210729001012.70394-1-oupton@google.com> Message-Id: <20210729001012.70394-5-oupton@google.com> Mime-Version: 1.0 References: <20210729001012.70394-1-oupton@google.com> X-Mailer: git-send-email 2.32.0.432.gabb21c7263-goog Subject: [PATCH v4 04/13] tools: arch: x86: pull in pvclock headers From: Oliver Upton To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Paolo Bonzini , Sean Christopherson , Marc Zyngier , Peter Shier , Jim Mattson , David Matlack , Ricardo Koller , Jing Zhang , Raghavendra Rao Anata , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, Andrew Jones , Oliver Upton Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Copy over approximately clean versions of the pvclock headers into tools. Reconcile headers/symbols missing in tools that are unneeded. Signed-off-by: Oliver Upton --- tools/arch/x86/include/asm/pvclock-abi.h | 48 +++++++++++ tools/arch/x86/include/asm/pvclock.h | 103 +++++++++++++++++++++++ 2 files changed, 151 insertions(+) create mode 100644 tools/arch/x86/include/asm/pvclock-abi.h create mode 100644 tools/arch/x86/include/asm/pvclock.h diff --git a/tools/arch/x86/include/asm/pvclock-abi.h b/tools/arch/x86/include/asm/pvclock-abi.h new file mode 100644 index 000000000000..1436226efe3e --- /dev/null +++ b/tools/arch/x86/include/asm/pvclock-abi.h @@ -0,0 +1,48 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_PVCLOCK_ABI_H +#define _ASM_X86_PVCLOCK_ABI_H +#ifndef __ASSEMBLY__ + +/* + * These structs MUST NOT be changed. + * They are the ABI between hypervisor and guest OS. + * Both Xen and KVM are using this. + * + * pvclock_vcpu_time_info holds the system time and the tsc timestamp + * of the last update. So the guest can use the tsc delta to get a + * more precise system time. There is one per virtual cpu. + * + * pvclock_wall_clock references the point in time when the system + * time was zero (usually boot time), thus the guest calculates the + * current wall clock by adding the system time. + * + * Protocol for the "version" fields is: hypervisor raises it (making + * it uneven) before it starts updating the fields and raises it again + * (making it even) when it is done. Thus the guest can make sure the + * time values it got are consistent by checking the version before + * and after reading them. + */ + +struct pvclock_vcpu_time_info { + u32 version; + u32 pad0; + u64 tsc_timestamp; + u64 system_time; + u32 tsc_to_system_mul; + s8 tsc_shift; + u8 flags; + u8 pad[2]; +} __attribute__((__packed__)); /* 32 bytes */ + +struct pvclock_wall_clock { + u32 version; + u32 sec; + u32 nsec; +} __attribute__((__packed__)); + +#define PVCLOCK_TSC_STABLE_BIT (1 << 0) +#define PVCLOCK_GUEST_STOPPED (1 << 1) +/* PVCLOCK_COUNTS_FROM_ZERO broke ABI and can't be used anymore. */ +#define PVCLOCK_COUNTS_FROM_ZERO (1 << 2) +#endif /* __ASSEMBLY__ */ +#endif /* _ASM_X86_PVCLOCK_ABI_H */ diff --git a/tools/arch/x86/include/asm/pvclock.h b/tools/arch/x86/include/asm/pvclock.h new file mode 100644 index 000000000000..2628f9a6330b --- /dev/null +++ b/tools/arch/x86/include/asm/pvclock.h @@ -0,0 +1,103 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_X86_PVCLOCK_H +#define _ASM_X86_PVCLOCK_H + +#include +#include + +/* some helper functions for xen and kvm pv clock sources */ +u64 pvclock_clocksource_read(struct pvclock_vcpu_time_info *src); +u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src); +void pvclock_set_flags(u8 flags); +unsigned long pvclock_tsc_khz(struct pvclock_vcpu_time_info *src); +void pvclock_resume(void); + +void pvclock_touch_watchdogs(void); + +static __always_inline +unsigned pvclock_read_begin(const struct pvclock_vcpu_time_info *src) +{ + unsigned version = src->version & ~1; + /* Make sure that the version is read before the data. */ + rmb(); + return version; +} + +static __always_inline +bool pvclock_read_retry(const struct pvclock_vcpu_time_info *src, + unsigned version) +{ + /* Make sure that the version is re-read after the data. */ + rmb(); + return version != src->version; +} + +/* + * Scale a 64-bit delta by scaling and multiplying by a 32-bit fraction, + * yielding a 64-bit result. + */ +static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift) +{ + u64 product; +#ifdef __i386__ + u32 tmp1, tmp2; +#else + unsigned long tmp; +#endif + + if (shift < 0) + delta >>= -shift; + else + delta <<= shift; + +#ifdef __i386__ + __asm__ ( + "mul %5 ; " + "mov %4,%%eax ; " + "mov %%edx,%4 ; " + "mul %5 ; " + "xor %5,%5 ; " + "add %4,%%eax ; " + "adc %5,%%edx ; " + : "=A" (product), "=r" (tmp1), "=r" (tmp2) + : "a" ((u32)delta), "1" ((u32)(delta >> 32)), "2" (mul_frac) ); +#elif defined(__x86_64__) + __asm__ ( + "mulq %[mul_frac] ; shrd $32, %[hi], %[lo]" + : [lo]"=a"(product), + [hi]"=d"(tmp) + : "0"(delta), + [mul_frac]"rm"((u64)mul_frac)); +#else +#error implement me! +#endif + + return product; +} + +static __always_inline +u64 __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src, u64 tsc) +{ + u64 delta = tsc - src->tsc_timestamp; + u64 offset = pvclock_scale_delta(delta, src->tsc_to_system_mul, + src->tsc_shift); + return src->system_time + offset; +} + +struct pvclock_vsyscall_time_info { + struct pvclock_vcpu_time_info pvti; +} __attribute__((__aligned__(64))); + +#define PVTI_SIZE sizeof(struct pvclock_vsyscall_time_info) + +#ifdef CONFIG_PARAVIRT_CLOCK +void pvclock_set_pvti_cpu0_va(struct pvclock_vsyscall_time_info *pvti); +struct pvclock_vsyscall_time_info *pvclock_get_pvti_cpu0_va(void); +#else +static inline struct pvclock_vsyscall_time_info *pvclock_get_pvti_cpu0_va(void) +{ + return NULL; +} +#endif + +#endif /* _ASM_X86_PVCLOCK_H */