From: Brijesh Singh <brijesh.singh@amd.com>
To: Paolo Bonzini <pbonzini@redhat.com>, <simon.guinot@sequanux.org>,
<linux-efi@vger.kernel.org>, <kvm@vger.kernel.org>,
<rkrcmar@redhat.com>, <matt@codeblueprint.co.uk>,
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<dan.j.williams@intel.com>, <aarcange@redhat.com>,
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<mcgrof@kernel.org>, <mst@redhat.com>,
<linux-crypto@vger.kernel.org>, <tj@kernel.org>,
<akpm@linux-foundation.org>, <davem@davemloft.net>
Cc: <brijesh.singh@amd.com>
Subject: Re: [RFC PATCH v2 26/32] kvm: svm: Add support for SEV LAUNCH_UPDATE_DATA command
Date: Thu, 16 Mar 2017 13:20:06 -0500 [thread overview]
Message-ID: <5fb4d24c-f070-cc22-7a47-fb55ba430011@amd.com> (raw)
In-Reply-To: <14021d2a-2a94-a0c8-88db-acbc04b4daac@redhat.com>
On 03/16/2017 05:48 AM, Paolo Bonzini wrote:
>
>
> On 02/03/2017 16:17, Brijesh Singh wrote:
>> +static struct page **sev_pin_memory(unsigned long uaddr, unsigned long ulen,
>> + unsigned long *n)
>> +{
>> + struct page **pages;
>> + int first, last;
>> + unsigned long npages, pinned;
>> +
>> + /* Get number of pages */
>> + first = (uaddr & PAGE_MASK) >> PAGE_SHIFT;
>> + last = ((uaddr + ulen - 1) & PAGE_MASK) >> PAGE_SHIFT;
>> + npages = (last - first + 1);
>> +
>> + pages = kzalloc(npages * sizeof(struct page *), GFP_KERNEL);
>> + if (!pages)
>> + return NULL;
>> +
>> + /* pin the user virtual address */
>> + down_read(¤t->mm->mmap_sem);
>> + pinned = get_user_pages_fast(uaddr, npages, 1, pages);
>> + up_read(¤t->mm->mmap_sem);
>
> get_user_pages_fast, like get_user_pages_unlocked, must be called
> without mmap_sem held.
Sure.
>
>> + if (pinned != npages) {
>> + printk(KERN_ERR "SEV: failed to pin %ld pages (got %ld)\n",
>> + npages, pinned);
>> + goto err;
>> + }
>> +
>> + *n = npages;
>> + return pages;
>> +err:
>> + if (pinned > 0)
>> + release_pages(pages, pinned, 0);
>> + kfree(pages);
>> +
>> + return NULL;
>> +}
>>
>> + /* the array of pages returned by get_user_pages() is a page-aligned
>> + * memory. Since the user buffer is probably not page-aligned, we need
>> + * to calculate the offset within a page for first update entry.
>> + */
>> + offset = uaddr & (PAGE_SIZE - 1);
>> + len = min_t(size_t, (PAGE_SIZE - offset), ulen);
>> + ulen -= len;
>> +
>> + /* update first page -
>> + * special care need to be taken for the first page because we might
>> + * be dealing with offset within the page
>> + */
>
> No need to special case the first page; just set "offset = 0" inside the
> loop after the first iteration.
>
Will do.
-Brijesh
next prev parent reply other threads:[~2017-03-16 18:20 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-02 15:12 [RFC PATCH v2 00/32] x86: Secure Encrypted Virtualization (AMD) Brijesh Singh
2017-03-02 15:12 ` [RFC PATCH v2 01/32] x86: Add the Secure Encrypted Virtualization CPU feature Brijesh Singh
2017-03-03 16:59 ` Borislav Petkov
2017-03-03 21:01 ` Brijesh Singh
2017-03-04 10:11 ` Borislav Petkov
2017-03-06 18:11 ` Brijesh Singh
2017-03-06 20:54 ` Borislav Petkov
2017-03-02 15:12 ` [RFC PATCH v2 02/32] x86: Secure Encrypted Virtualization (SEV) support Brijesh Singh
2017-03-07 11:19 ` Borislav Petkov
2017-03-08 15:06 ` Borislav Petkov
2017-03-02 15:12 ` [RFC PATCH v2 03/32] KVM: SVM: prepare for new bit definition in nested_ctl Brijesh Singh
2017-03-02 15:12 ` [RFC PATCH v2 04/32] KVM: SVM: Add SEV feature definitions to KVM Brijesh Singh
2017-03-07 0:50 ` Borislav Petkov
2017-03-02 15:12 ` [RFC PATCH v2 05/32] x86: Use encrypted access of BOOT related data with SEV Brijesh Singh
2017-03-07 11:09 ` Borislav Petkov
2017-03-16 19:03 ` Tom Lendacky
2017-03-02 15:13 ` [RFC PATCH v2 06/32] x86/pci: Use memremap when walking setup data Brijesh Singh
2017-03-03 20:42 ` Bjorn Helgaas
2017-03-03 21:15 ` Tom Lendacky
2017-03-07 0:03 ` Bjorn Helgaas
2017-03-13 20:08 ` Tom Lendacky
2017-03-02 15:13 ` [RFC PATCH v2 07/32] x86/efi: Access EFI data as encrypted when SEV is active Brijesh Singh
2017-03-07 11:57 ` Borislav Petkov
2017-03-02 15:13 ` [RFC PATCH v2 08/32] x86: Use PAGE_KERNEL protection for ioremap of memory page Brijesh Singh
2017-03-07 14:59 ` Borislav Petkov
2017-03-16 20:04 ` Tom Lendacky
2017-03-17 14:32 ` Tom Lendacky
2017-03-17 14:55 ` Tom Lendacky
2017-03-02 15:13 ` [RFC PATCH v2 09/32] x86: Change early_ioremap to early_memremap for BOOT data Brijesh Singh
2017-03-08 8:46 ` Borislav Petkov
2017-03-02 15:14 ` [RFC PATCH v2 10/32] x86: DMA support for SEV memory encryption Brijesh Singh
2017-03-08 10:56 ` Borislav Petkov
2017-03-02 15:14 ` [RFC PATCH v2 11/32] x86: Unroll string I/O when SEV is active Brijesh Singh
2017-03-02 15:14 ` [RFC PATCH v2 12/32] x86: Add early boot support when running with SEV active Brijesh Singh
2017-03-09 14:07 ` Borislav Petkov
2017-03-09 16:13 ` Paolo Bonzini
2017-03-09 16:29 ` Borislav Petkov
2017-03-10 16:35 ` Brijesh Singh
2017-03-16 10:16 ` Borislav Petkov
2017-03-16 14:28 ` Tom Lendacky
2017-03-16 15:09 ` Borislav Petkov
2017-03-16 16:11 ` Tom Lendacky
2017-03-16 16:29 ` Borislav Petkov
2017-03-02 15:15 ` [RFC PATCH v2 13/32] KVM: SVM: Enable SEV by setting the SEV_ENABLE CPU feature Brijesh Singh
2017-03-09 19:29 ` Borislav Petkov
2017-03-02 15:15 ` [RFC PATCH v2 14/32] x86: mm: Provide support to use memblock when spliting large pages Brijesh Singh
2017-03-10 11:06 ` Borislav Petkov
2017-03-10 22:41 ` Brijesh Singh
2017-03-16 13:15 ` Paolo Bonzini
2017-03-16 18:28 ` Borislav Petkov
2017-03-16 12:28 ` Paolo Bonzini
2017-03-02 15:15 ` [RFC PATCH v2 15/32] x86: Add support for changing memory encryption attribute in early boot Brijesh Singh
2017-03-24 17:12 ` Borislav Petkov
2017-03-27 15:07 ` Brijesh Singh
2017-03-02 15:15 ` [RFC PATCH v2 16/32] x86: kvm: Provide support to create Guest and HV shared per-CPU variables Brijesh Singh
2017-03-16 11:06 ` Paolo Bonzini
2017-03-28 18:39 ` Borislav Petkov
2017-03-29 15:21 ` Paolo Bonzini
2017-03-29 15:32 ` Borislav Petkov
2017-03-02 15:15 ` [RFC PATCH v2 17/32] x86: kvmclock: Clear encryption attribute when SEV is active Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 18/32] kvm: svm: Use the hardware provided GPA instead of page walk Brijesh Singh
2017-03-29 15:14 ` Borislav Petkov
2017-03-29 17:08 ` Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 19/32] crypto: ccp: Introduce the AMD Secure Processor device Brijesh Singh
2017-03-02 17:39 ` Mark Rutland
2017-03-02 19:11 ` Brijesh Singh
2017-03-03 13:55 ` Andy Shevchenko
2017-03-02 15:16 ` [RFC PATCH v2 20/32] crypto: ccp: Add Platform Security Processor (PSP) interface support Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 21/32] crypto: ccp: Add Secure Encrypted Virtualization (SEV) " Brijesh Singh
2017-03-02 15:16 ` [RFC PATCH v2 22/32] kvm: svm: prepare to reserve asid for SEV guest Brijesh Singh
2017-03-02 15:17 ` [RFC PATCH v2 23/32] kvm: introduce KVM_MEMORY_ENCRYPT_OP ioctl Brijesh Singh
2017-03-16 10:25 ` Paolo Bonzini
2017-03-02 15:17 ` [RFC PATCH v2 24/32] kvm: x86: prepare for SEV guest management API support Brijesh Singh
2017-03-16 10:33 ` Paolo Bonzini
2017-03-02 15:17 ` [RFC PATCH v2 25/32] kvm: svm: Add support for SEV LAUNCH_START command Brijesh Singh
2017-03-02 15:17 ` [RFC PATCH v2 26/32] kvm: svm: Add support for SEV LAUNCH_UPDATE_DATA command Brijesh Singh
2017-03-16 10:48 ` Paolo Bonzini
2017-03-16 18:20 ` Brijesh Singh [this message]
2017-03-02 15:17 ` [RFC PATCH v2 27/32] kvm: svm: Add support for SEV LAUNCH_FINISH command Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 28/32] kvm: svm: Add support for SEV GUEST_STATUS command Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 29/32] kvm: svm: Add support for SEV DEBUG_DECRYPT command Brijesh Singh
2017-03-16 10:54 ` Paolo Bonzini
2017-03-16 18:41 ` Brijesh Singh
2017-03-17 11:09 ` Paolo Bonzini
2017-03-02 15:18 ` [RFC PATCH v2 30/32] kvm: svm: Add support for SEV DEBUG_ENCRYPT command Brijesh Singh
2017-03-16 11:03 ` Paolo Bonzini
2017-03-16 18:34 ` Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 31/32] kvm: svm: Add support for SEV LAUNCH_MEASURE command Brijesh Singh
2017-03-02 15:18 ` [RFC PATCH v2 32/32] x86: kvm: Pin the guest memory when SEV is active Brijesh Singh
2017-03-16 10:38 ` Paolo Bonzini
2017-03-16 18:17 ` Brijesh Singh
2017-03-03 20:33 ` [RFC PATCH v2 00/32] x86: Secure Encrypted Virtualization (AMD) Bjorn Helgaas
2017-03-03 20:51 ` Borislav Petkov
2017-03-03 21:15 ` Brijesh Singh
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