From patchwork Mon Dec 28 21:52:35 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joao Martins X-Patchwork-Id: 7927601 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id BCF509F387 for ; Mon, 28 Dec 2015 21:54:09 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D9752201DD for ; Mon, 28 Dec 2015 21:54:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C47E5201B9 for ; Mon, 28 Dec 2015 21:54:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752783AbbL1VxV (ORCPT ); Mon, 28 Dec 2015 16:53:21 -0500 Received: from userp1040.oracle.com ([156.151.31.81]:49810 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752676AbbL1VxN (ORCPT ); Mon, 28 Dec 2015 16:53:13 -0500 Received: from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id tBSLqrBT010689 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Mon, 28 Dec 2015 21:52:53 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userv0022.oracle.com (8.13.8/8.13.8) with ESMTP id tBSLqrdU006338 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Mon, 28 Dec 2015 21:52:53 GMT Received: from abhmp0013.oracle.com (abhmp0013.oracle.com [141.146.116.19]) by aserv0122.oracle.com (8.13.8/8.13.8) with ESMTP id tBSLqr8F014041; Mon, 28 Dec 2015 21:52:53 GMT Received: from paddy.lan (/85.245.89.156) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 28 Dec 2015 13:52:52 -0800 From: Joao Martins To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Joao Martins , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Gleb Natapov , Paolo Bonzini , Andy Lutomirski , Borislav Petkov , Marcelo Tosatti , xen-devel@lists.xen.org Subject: [PATCH RFC 1/3] x86/pvclock: add setter for pvclock_pvti_cpu0_va Date: Mon, 28 Dec 2015 21:52:35 +0000 Message-Id: <1451339557-24473-2-git-send-email-joao.m.martins@oracle.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1451339557-24473-1-git-send-email-joao.m.martins@oracle.com> References: <1451339557-24473-1-git-send-email-joao.m.martins@oracle.com> X-Source-IP: userv0022.oracle.com [156.151.31.74] Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Right now there is only a pvclock_pvti_cpu0_va() which is defined on kvmclock since: commit dac16fba6fc5 ("x86/vdso: Get pvclock data from the vvar VMA instead of the fixmap") The only user of this interface so far is kvm. This commit adds a setter function for the pvti page and moves pvclock_pvti_cpu0_va to pvclock, which is a more generic place to have it; and would allow other PV clocksources to use it, such as Xen. Signed-off-by: Joao Martins --- arch/x86/include/asm/pvclock.h | 22 +++++++++++++--------- arch/x86/kernel/kvmclock.c | 6 +----- arch/x86/kernel/pvclock.c | 11 +++++++++++ 3 files changed, 25 insertions(+), 14 deletions(-) diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h index 66df22b..cfb1bb6 100644 --- a/arch/x86/include/asm/pvclock.h +++ b/arch/x86/include/asm/pvclock.h @@ -4,15 +4,6 @@ #include #include -#ifdef CONFIG_PARAVIRT_CLOCK -extern struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void); -#else -static inline struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void) -{ - return NULL; -} -#endif - /* some helper functions for xen and kvm pv clock sources */ cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src); u8 pvclock_read_flags(struct pvclock_vcpu_time_info *src); @@ -101,4 +92,17 @@ struct pvclock_vsyscall_time_info { #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_pvti_cpu0_va(void); +#else +static inline void pvclock_set_pvti_cpu0_va(struct pvclock_vsyscall_time_info *) +{ +} +static inline struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void) +{ + return NULL; +} +#endif + #endif /* _ASM_X86_PVCLOCK_H */ diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c index 72cef58..02a5d9e6 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -45,11 +45,6 @@ early_param("no-kvmclock", parse_no_kvmclock); static struct pvclock_vsyscall_time_info *hv_clock; static struct pvclock_wall_clock wall_clock; -struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void) -{ - return hv_clock; -} - /* * The wallclock is the time of day when we booted. Since then, some time may * have elapsed since the hypervisor wrote the data. So we try to account for @@ -329,6 +324,7 @@ int __init kvm_setup_vsyscall_timeinfo(void) return 1; } + pvclock_set_pvti_cpu0_va(hv_clock); put_cpu(); kvm_clock.archdata.vclock_mode = VCLOCK_PVCLOCK; diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c index 99bfc02..da6fbe2 100644 --- a/arch/x86/kernel/pvclock.c +++ b/arch/x86/kernel/pvclock.c @@ -25,6 +25,7 @@ #include static u8 valid_flags __read_mostly = 0; +static struct pvclock_vsyscall_time_info *pvti_cpu0_va __read_mostly; void pvclock_set_flags(u8 flags) { @@ -140,3 +141,13 @@ void pvclock_read_wallclock(struct pvclock_wall_clock *wall_clock, set_normalized_timespec(ts, now.tv_sec, now.tv_nsec); } + +void pvclock_set_pvti_cpu0_va(struct pvclock_vsyscall_time_info *pvti) +{ + pvti_cpu0_va = pvti; +} + +struct pvclock_vsyscall_time_info *pvclock_pvti_cpu0_va(void) +{ + return pvti_cpu0_va; +}