From: Vincenzo Frascino <vincenzo.frascino@arm.com> To: Andrei Vagin <avagin@gmail.com> Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>, Dmitry Safonov <dima@arista.com> Subject: Re: [PATCH v2 1/6] arm64/vdso: use the fault callback to map vvar pages Date: Thu, 9 Apr 2020 13:01:12 +0100 [thread overview] Message-ID: <fd287633-a383-e1ee-2c4a-b961e1b95d66@arm.com> (raw) In-Reply-To: <20200225073731.465270-2-avagin@gmail.com> On 2/25/20 7:37 AM, Andrei Vagin wrote: > This is required to support time namespaces where a time namespace data > page is different for each namespace. > > Signed-off-by: Andrei Vagin <avagin@gmail.com> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> > --- > arch/arm64/kernel/vdso.c | 24 +++++++++++++++--------- > 1 file changed, 15 insertions(+), 9 deletions(-) > > diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c > index 354b11e27c07..290c36d74e03 100644 > --- a/arch/arm64/kernel/vdso.c > +++ b/arch/arm64/kernel/vdso.c > @@ -114,28 +114,32 @@ static int __vdso_init(enum arch_vdso_type arch_index) > PAGE_SHIFT; > > /* Allocate the vDSO pagelist, plus a page for the data. */ > - vdso_pagelist = kcalloc(vdso_lookup[arch_index].vdso_pages + 1, > + vdso_pagelist = kcalloc(vdso_lookup[arch_index].vdso_pages, > sizeof(struct page *), > GFP_KERNEL); > if (vdso_pagelist == NULL) > return -ENOMEM; > > - /* Grab the vDSO data page. */ > - vdso_pagelist[0] = phys_to_page(__pa_symbol(vdso_data)); > - > - > /* Grab the vDSO code pages. */ > pfn = sym_to_pfn(vdso_lookup[arch_index].vdso_code_start); > > for (i = 0; i < vdso_lookup[arch_index].vdso_pages; i++) > - vdso_pagelist[i + 1] = pfn_to_page(pfn + i); > + vdso_pagelist[i] = pfn_to_page(pfn + i); > > - vdso_lookup[arch_index].dm->pages = &vdso_pagelist[0]; > - vdso_lookup[arch_index].cm->pages = &vdso_pagelist[1]; > + vdso_lookup[arch_index].cm->pages = vdso_pagelist; > > return 0; > } > > +static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, > + struct vm_area_struct *vma, struct vm_fault *vmf) > +{ > + if (vmf->pgoff == 0) > + return vmf_insert_pfn(vma, vmf->address, > + sym_to_pfn(vdso_data)); > + return VM_FAULT_SIGBUS; > +} > + > static int __setup_additional_pages(enum arch_vdso_type arch_index, > struct mm_struct *mm, > struct linux_binprm *bprm, > @@ -155,7 +159,7 @@ static int __setup_additional_pages(enum arch_vdso_type arch_index, > } > > ret = _install_special_mapping(mm, vdso_base, PAGE_SIZE, > - VM_READ|VM_MAYREAD, > + VM_READ|VM_MAYREAD|VM_PFNMAP, > vdso_lookup[arch_index].dm); > if (IS_ERR(ret)) > goto up_fail; > @@ -215,6 +219,7 @@ static struct vm_special_mapping aarch32_vdso_spec[C_PAGES] = { > #ifdef CONFIG_COMPAT_VDSO > { > .name = "[vvar]", > + .fault = vvar_fault, > }, > { > .name = "[vdso]", > @@ -396,6 +401,7 @@ static int vdso_mremap(const struct vm_special_mapping *sm, > static struct vm_special_mapping vdso_spec[A_PAGES] __ro_after_init = { > { > .name = "[vvar]", > + .fault = vvar_fault, > }, > { > .name = "[vdso]", > -- Regards, Vincenzo
WARNING: multiple messages have this Message-ID (diff)
From: Vincenzo Frascino <vincenzo.frascino@arm.com> To: Andrei Vagin <avagin@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de>, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Dmitry Safonov <dima@arista.com> Subject: Re: [PATCH v2 1/6] arm64/vdso: use the fault callback to map vvar pages Date: Thu, 9 Apr 2020 13:01:12 +0100 [thread overview] Message-ID: <fd287633-a383-e1ee-2c4a-b961e1b95d66@arm.com> (raw) In-Reply-To: <20200225073731.465270-2-avagin@gmail.com> On 2/25/20 7:37 AM, Andrei Vagin wrote: > This is required to support time namespaces where a time namespace data > page is different for each namespace. > > Signed-off-by: Andrei Vagin <avagin@gmail.com> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> > --- > arch/arm64/kernel/vdso.c | 24 +++++++++++++++--------- > 1 file changed, 15 insertions(+), 9 deletions(-) > > diff --git a/arch/arm64/kernel/vdso.c b/arch/arm64/kernel/vdso.c > index 354b11e27c07..290c36d74e03 100644 > --- a/arch/arm64/kernel/vdso.c > +++ b/arch/arm64/kernel/vdso.c > @@ -114,28 +114,32 @@ static int __vdso_init(enum arch_vdso_type arch_index) > PAGE_SHIFT; > > /* Allocate the vDSO pagelist, plus a page for the data. */ > - vdso_pagelist = kcalloc(vdso_lookup[arch_index].vdso_pages + 1, > + vdso_pagelist = kcalloc(vdso_lookup[arch_index].vdso_pages, > sizeof(struct page *), > GFP_KERNEL); > if (vdso_pagelist == NULL) > return -ENOMEM; > > - /* Grab the vDSO data page. */ > - vdso_pagelist[0] = phys_to_page(__pa_symbol(vdso_data)); > - > - > /* Grab the vDSO code pages. */ > pfn = sym_to_pfn(vdso_lookup[arch_index].vdso_code_start); > > for (i = 0; i < vdso_lookup[arch_index].vdso_pages; i++) > - vdso_pagelist[i + 1] = pfn_to_page(pfn + i); > + vdso_pagelist[i] = pfn_to_page(pfn + i); > > - vdso_lookup[arch_index].dm->pages = &vdso_pagelist[0]; > - vdso_lookup[arch_index].cm->pages = &vdso_pagelist[1]; > + vdso_lookup[arch_index].cm->pages = vdso_pagelist; > > return 0; > } > > +static vm_fault_t vvar_fault(const struct vm_special_mapping *sm, > + struct vm_area_struct *vma, struct vm_fault *vmf) > +{ > + if (vmf->pgoff == 0) > + return vmf_insert_pfn(vma, vmf->address, > + sym_to_pfn(vdso_data)); > + return VM_FAULT_SIGBUS; > +} > + > static int __setup_additional_pages(enum arch_vdso_type arch_index, > struct mm_struct *mm, > struct linux_binprm *bprm, > @@ -155,7 +159,7 @@ static int __setup_additional_pages(enum arch_vdso_type arch_index, > } > > ret = _install_special_mapping(mm, vdso_base, PAGE_SIZE, > - VM_READ|VM_MAYREAD, > + VM_READ|VM_MAYREAD|VM_PFNMAP, > vdso_lookup[arch_index].dm); > if (IS_ERR(ret)) > goto up_fail; > @@ -215,6 +219,7 @@ static struct vm_special_mapping aarch32_vdso_spec[C_PAGES] = { > #ifdef CONFIG_COMPAT_VDSO > { > .name = "[vvar]", > + .fault = vvar_fault, > }, > { > .name = "[vdso]", > @@ -396,6 +401,7 @@ static int vdso_mremap(const struct vm_special_mapping *sm, > static struct vm_special_mapping vdso_spec[A_PAGES] __ro_after_init = { > { > .name = "[vvar]", > + .fault = vvar_fault, > }, > { > .name = "[vdso]", > -- Regards, Vincenzo _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-04-09 12:00 UTC|newest] Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-02-25 7:37 [PATCH v2 0/6] arm64: add the time namespace support Andrei Vagin 2020-02-25 7:37 ` Andrei Vagin 2020-02-25 7:37 ` [PATCH v2 1/6] arm64/vdso: use the fault callback to map vvar pages Andrei Vagin 2020-02-25 7:37 ` Andrei Vagin 2020-04-09 12:01 ` Vincenzo Frascino [this message] 2020-04-09 12:01 ` Vincenzo Frascino 2020-02-25 7:37 ` [PATCH v2 2/6] arm64/vdso: Zap vvar pages when switching to a time namespace Andrei Vagin 2020-02-25 7:37 ` Andrei Vagin 2020-04-09 12:01 ` Vincenzo Frascino 2020-04-09 12:01 ` Vincenzo Frascino 2020-02-25 7:37 ` [PATCH v2 3/6] arm64/vdso: Add time napespace page Andrei Vagin 2020-02-25 7:37 ` Andrei Vagin 2020-04-09 12:03 ` Vincenzo Frascino 2020-04-09 12:03 ` Vincenzo Frascino 2020-04-14 17:20 ` Mark Rutland 2020-04-14 17:20 ` Mark Rutland 2020-04-15 2:34 ` Andrei Vagin 2020-04-15 2:34 ` Andrei Vagin 2020-04-15 10:05 ` Mark Rutland 2020-04-15 10:05 ` Mark Rutland 2020-04-15 10:16 ` Vincenzo Frascino 2020-04-15 10:16 ` Vincenzo Frascino 2020-04-15 12:27 ` Mark Rutland 2020-04-15 12:27 ` Mark Rutland 2020-02-25 7:37 ` [PATCH v2 4/6] arm64/vdso: Handle faults on timens page Andrei Vagin 2020-02-25 7:37 ` Andrei Vagin 2020-04-09 12:04 ` Vincenzo Frascino 2020-04-09 12:04 ` Vincenzo Frascino 2020-02-25 7:37 ` [PATCH v2 5/6] arm64/vdso: Restrict splitting VVAR VMA Andrei Vagin 2020-02-25 7:37 ` Andrei Vagin 2020-04-09 12:05 ` Vincenzo Frascino 2020-04-09 12:05 ` Vincenzo Frascino 2020-02-25 7:37 ` [PATCH v2 6/6] arm64: enable time namespace support Andrei Vagin 2020-02-25 7:37 ` Andrei Vagin 2020-04-09 12:06 ` Vincenzo Frascino 2020-04-09 12:06 ` Vincenzo Frascino 2020-04-01 6:50 ` [PATCH v2 0/6] arm64: add the " Andrei Vagin 2020-04-01 6:50 ` Andrei Vagin 2020-04-01 9:02 ` Vincenzo Frascino 2020-04-01 9:02 ` Vincenzo Frascino 2020-04-09 13:24 ` Vincenzo Frascino 2020-04-09 13:24 ` Vincenzo Frascino 2020-04-11 7:33 ` Andrei Vagin 2020-04-11 7:33 ` Andrei Vagin 2020-04-14 9:02 ` Vincenzo Frascino 2020-04-14 9:02 ` Vincenzo Frascino 2020-04-15 16:14 ` Andrei Vagin 2020-04-15 16:14 ` Andrei Vagin 2020-04-15 16:35 ` Vincenzo Frascino 2020-04-15 16:35 ` Vincenzo Frascino
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=fd287633-a383-e1ee-2c4a-b961e1b95d66@arm.com \ --to=vincenzo.frascino@arm.com \ --cc=avagin@gmail.com \ --cc=dima@arista.com \ --cc=linux-arm-kernel@lists.infradead.org \ --cc=linux-kernel@vger.kernel.org \ --cc=tglx@linutronix.de \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.