From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752681AbdHBQKB (ORCPT ); Wed, 2 Aug 2017 12:10:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59660 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751154AbdHBQJ6 (ORCPT ); Wed, 2 Aug 2017 12:09:58 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 22E6FC0587EE Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=vkuznets@redhat.com From: Vitaly Kuznetsov To: x86@kernel.org, devel@linuxdriverproject.org Cc: linux-kernel@vger.kernel.org, "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Steven Rostedt , Jork Loeser , Simon Xiao , Andy Lutomirski , Andy Shevchenko Subject: [PATCH v10 5/9] x86/hyper-v: implement rep hypercalls Date: Wed, 2 Aug 2017 18:09:17 +0200 Message-Id: <20170802160921.21791-6-vkuznets@redhat.com> In-Reply-To: <20170802160921.21791-1-vkuznets@redhat.com> References: <20170802160921.21791-1-vkuznets@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Wed, 02 Aug 2017 16:09:58 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Rep hypercalls are normal hypercalls which perform multiple actions at once. Hyper-V guarantees to return exectution to the caller in not more than 50us and the caller needs to use hypercall continuation. Touch NMI watchdog between hypercall invocations. This is going to be used for HvFlushVirtualAddressList hypercall for remote TLB flushing. Signed-off-by: Vitaly Kuznetsov Reviewed-by: Andy Shevchenko Reviewed-by: Stephen Hemminger --- arch/x86/include/asm/mshyperv.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index e484255bd9de..efa1860276b5 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -3,6 +3,7 @@ #include #include +#include #include #include @@ -209,7 +210,13 @@ static inline u64 hv_do_hypercall(u64 control, void *input, void *output) return hv_status; } +#define HV_HYPERCALL_RESULT_MASK GENMASK_ULL(15, 0) #define HV_HYPERCALL_FAST_BIT BIT(16) +#define HV_HYPERCALL_VARHEAD_OFFSET 17 +#define HV_HYPERCALL_REP_COMP_OFFSET 32 +#define HV_HYPERCALL_REP_COMP_MASK GENMASK_ULL(43, 32) +#define HV_HYPERCALL_REP_START_OFFSET 48 +#define HV_HYPERCALL_REP_START_MASK GENMASK_ULL(59, 48) /* Fast hypercall with 8 bytes of input and no output */ static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) @@ -243,6 +250,38 @@ static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1) return hv_status; } +/* + * Rep hypercalls. Callers of this functions are supposed to ensure that + * rep_count and varhead_size comply with Hyper-V hypercall definition. + */ +static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size, + void *input, void *output) +{ + u64 control = code; + u64 status; + u16 rep_comp; + + control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET; + control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET; + + do { + status = hv_do_hypercall(control, input, output); + if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS) + return status; + + /* Bits 32-43 of status have 'Reps completed' data. */ + rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >> + HV_HYPERCALL_REP_COMP_OFFSET; + + control &= ~HV_HYPERCALL_REP_START_MASK; + control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET; + + touch_nmi_watchdog(); + } while (rep_comp < rep_count); + + return status; +} + void hyperv_init(void); void hyperv_report_panic(struct pt_regs *regs); bool hv_is_hypercall_page_setup(void); -- 2.13.3