From: KY Srinivasan <kys@microsoft.com>
To: "Roman Kagan" <rkagan@virtuozzo.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Vitaly Kuznetsov" <vkuznets@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
"x86@kernel.org" <x86@kernel.org>,
"Haiyang Zhang" <haiyangz@microsoft.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"devel@linuxdriverproject.org" <devel@linuxdriverproject.org>,
"Denis V . Lunev" <den@openvz.org>
Subject: RE: [PATCH 06/15] hyperv: avoid unnecessary vmalloc
Date: Wed, 21 Dec 2016 19:19:39 +0000 [thread overview]
Message-ID: <DM5PR03MB249020520F8A94171FA9BA99A0930@DM5PR03MB2490.namprd03.prod.outlook.com> (raw)
In-Reply-To: <20161220155602.6298-7-rkagan@virtuozzo.com>
> -----Original Message-----
> From: Roman Kagan [mailto:rkagan@virtuozzo.com]
> Sent: Tuesday, December 20, 2016 7:56 AM
> To: Paolo Bonzini <pbonzini@redhat.com>; Radim Krčmář
> <rkrcmar@redhat.com>; KY Srinivasan <kys@microsoft.com>; Vitaly
> Kuznetsov <vkuznets@redhat.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>; Ingo Molnar
> <mingo@redhat.com>; H. Peter Anvin <hpa@zytor.com>; x86@kernel.org;
> Haiyang Zhang <haiyangz@microsoft.com>; kvm@vger.kernel.org; linux-
> kernel@vger.kernel.org; devel@linuxdriverproject.org; Denis V . Lunev
> <den@openvz.org>; Roman Kagan <rkagan@virtuozzo.com>
> Subject: [PATCH 06/15] hyperv: avoid unnecessary vmalloc
>
> Make hypercall and tsc page allocation similar to the rest of the
> Hyper-V shared memory stuff instead of vmalloc-ing them.
>
> Also perform cleanup unconditionally which is safe.
>
> TODO: the skipping of free in case of a crash is probably no longer
> necessary, too.
Please breakup these patches.
>
> Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
> ---
> drivers/hv/hv.c | 42 ++++++++++++++++++------------------------
> 1 file changed, 18 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
> index 6bbc0b09..b40c7d9 100644
> --- a/drivers/hv/hv.c
> +++ b/drivers/hv/hv.c
> @@ -29,6 +29,7 @@
> #include <linux/version.h>
> #include <linux/interrupt.h>
> #include <linux/clockchips.h>
> +#include <asm/cacheflush.h>
> #include <asm/hyperv.h>
> #include <asm/mshyperv.h>
> #include "hyperv_vmbus.h"
> @@ -208,14 +209,15 @@ int hv_init(void)
> /* See if the hypercall page is already set */
> rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
>
> - virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL,
> PAGE_KERNEL_EXEC);
> -
> - if (!virtaddr)
> + virtaddr = (void *)get_zeroed_page(GFP_KERNEL);
> + if (!virtaddr || set_memory_x((unsigned long)virtaddr, 1))
> goto cleanup;
Have you tested this patch.
> + hv_context.hypercall_page = virtaddr;
>
> hypercall_msr.enable = 1;
>
> - hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
> + hypercall_msr.guest_physical_address =
> + virt_to_phys(virtaddr) >> PAGE_SHIFT;
> wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
>
> /* Confirm that hypercall page did get setup. */
> @@ -225,14 +227,12 @@ int hv_init(void)
> if (!hypercall_msr.enable)
> goto cleanup;
>
> - hv_context.hypercall_page = virtaddr;
> -
> #ifdef CONFIG_X86_64
> if (ms_hyperv.features &
> HV_X64_MSR_REFERENCE_TSC_AVAILABLE) {
> union hv_x64_msr_hypercall_contents tsc_msr;
> void *va_tsc;
>
> - va_tsc = __vmalloc(PAGE_SIZE, GFP_KERNEL,
> PAGE_KERNEL);
> + va_tsc = (void *)get_zeroed_page(GFP_KERNEL);
> if (!va_tsc)
> goto cleanup;
> hv_context.tsc_page = va_tsc;
> @@ -240,7 +240,8 @@ int hv_init(void)
> rdmsrl(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
>
> tsc_msr.enable = 1;
> - tsc_msr.guest_physical_address = vmalloc_to_pfn(va_tsc);
> + tsc_msr.guest_physical_address =
> + virt_to_phys(va_tsc) >> PAGE_SHIFT;
>
> wrmsrl(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
> clocksource_register_hz(&hyperv_cs_tsc,
> NSEC_PER_SEC/100);
> @@ -249,14 +250,9 @@ int hv_init(void)
> return 0;
>
> cleanup:
> - if (virtaddr) {
> - if (hypercall_msr.enable) {
> - hypercall_msr.as_uint64 = 0;
> - wrmsrl(HV_X64_MSR_HYPERCALL,
> hypercall_msr.as_uint64);
> - }
> -
> - vfree(virtaddr);
> - }
> + hypercall_msr.as_uint64 = 0;
> + wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
> + free_page((unsigned long)virtaddr);
>
> return -ENOTSUPP;
> }
> @@ -273,13 +269,11 @@ void hv_cleanup(bool crash)
> /* Reset our OS id */
> wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
>
> - if (hv_context.hypercall_page) {
> - hypercall_msr.as_uint64 = 0;
> - wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
> - if (!crash)
> - vfree(hv_context.hypercall_page);
> - hv_context.hypercall_page = NULL;
> - }
> + hypercall_msr.as_uint64 = 0;
> + wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
> + if (!crash)
> + free_page((unsigned long)hv_context.hypercall_page);
> + hv_context.hypercall_page = NULL;
>
> #ifdef CONFIG_X86_64
> /*
> @@ -298,7 +292,7 @@ void hv_cleanup(bool crash)
> hypercall_msr.as_uint64 = 0;
> wrmsrl(HV_X64_MSR_REFERENCE_TSC,
> hypercall_msr.as_uint64);
> if (!crash)
> - vfree(hv_context.tsc_page);
> + free_page((unsigned long)hv_context.tsc_page);
> hv_context.tsc_page = NULL;
> }
> #endif
> --
> 2.9.3
next prev parent reply other threads:[~2016-12-21 19:19 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-20 15:55 [PATCH 00/15] hyperv: more stuff to uapi + cleanup Roman Kagan
2016-12-20 15:55 ` [PATCH 01/15] hyperv: consolidate TSC ref page definitions Roman Kagan
2016-12-20 20:57 ` KY Srinivasan
2016-12-21 6:25 ` Roman Kagan
2016-12-20 15:55 ` [PATCH 02/15] hyperv: uapi-fy synic event flags definitions Roman Kagan
2016-12-20 17:24 ` Stephen Hemminger
2016-12-21 6:33 ` Roman Kagan
2016-12-21 10:58 ` kbuild test robot
2016-12-21 18:58 ` KY Srinivasan
2016-12-20 15:55 ` [PATCH 03/15] hyperv: use standard bitops Roman Kagan
2016-12-21 12:00 ` Olaf Hering
2016-12-21 13:23 ` Roman Kagan
2016-12-22 12:33 ` Paolo Bonzini
2016-12-21 19:08 ` KY Srinivasan
2016-12-20 15:55 ` [PATCH 04/15] hyperv: define VMBus message type Roman Kagan
2016-12-20 15:55 ` [PATCH 05/15] hyperv: GFP_ATOMIC -> GFP_KERNEL Roman Kagan
2016-12-20 15:55 ` [PATCH 06/15] hyperv: avoid unnecessary vmalloc Roman Kagan
2016-12-21 19:19 ` KY Srinivasan [this message]
2016-12-20 15:55 ` [PATCH 07/15] hyperv: dedup cpuid definitions Roman Kagan
2016-12-20 15:55 ` [PATCH 08/15] hyperv: dedup crash msr related definitions Roman Kagan
2016-12-20 15:55 ` [PATCH 09/15] hyperv: unify Hyper-V msr definitions Roman Kagan
2016-12-20 15:55 ` [PATCH 10/15] hyperv: uapi-fy PostMessage and SignalEvent hypercall structures Roman Kagan
2016-12-21 19:27 ` KY Srinivasan
2016-12-20 15:55 ` [PATCH 11/15] hyperv: uapi-fy monitored notification structures Roman Kagan
2016-12-20 15:55 ` [PATCH 12/15] hyperv: move VMBus connection ids to uapi Roman Kagan
2016-12-20 17:25 ` Stephen Hemminger
2016-12-21 6:29 ` Roman Kagan
2016-12-21 12:18 ` Christoph Hellwig
2016-12-21 12:59 ` Roman Kagan
2016-12-21 14:26 ` Christoph Hellwig
2016-12-21 14:39 ` Roman Kagan
2016-12-21 15:39 ` Paolo Bonzini
2016-12-21 15:43 ` Christoph Hellwig
2016-12-21 17:25 ` Paolo Bonzini
2016-12-21 17:50 ` Stephen Hemminger
2016-12-21 17:53 ` Paolo Bonzini
2016-12-21 17:58 ` Christoph Hellwig
2016-12-21 18:02 ` Stephen Hemminger
2016-12-21 19:54 ` KY Srinivasan
2016-12-28 17:09 ` Roman Kagan
2016-12-29 18:29 ` Stephen Hemminger
2017-01-02 8:19 ` Paolo Bonzini
2017-01-09 8:32 ` Roman Kagan
2017-01-09 8:40 ` hpa
2017-01-09 8:58 ` Roman Kagan
2017-01-09 9:02 ` Paolo Bonzini
2017-01-02 19:39 ` Stephen Hemminger
2017-01-03 9:32 ` Paolo Bonzini
2016-12-20 15:56 ` [PATCH 13/15] hyperv: move function close to its only callsite Roman Kagan
2016-12-20 15:56 ` [PATCH 14/15] hyperv_vmbus: drop unused definitions Roman Kagan
2016-12-20 15:56 ` [PATCH 15/15] hyperv: redefine hv_message without bitfields Roman Kagan
2016-12-21 18:00 ` [PATCH 00/15] hyperv: more stuff to uapi + cleanup KY Srinivasan
2016-12-28 16:57 ` Roman Kagan
2016-12-30 19:45 ` KY Srinivasan
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