From: Brijesh Singh <brijesh.singh@amd.com>
To: <simon.guinot@sequanux.org>, <linux-efi@vger.kernel.org>,
<brijesh.singh@amd.com>, <kvm@vger.kernel.org>,
<rkrcmar@redhat.com>, <matt@codeblueprint.co.uk>,
<linux-pci@vger.kernel.org>, <linus.walleij@linaro.org>,
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<kuleshovmail@gmail.com>, <linux-kernel@vger.kernel.org>,
<mcgrof@kernel.org>, <mst@redhat.com>,
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<pbonzini@redhat.com>, <akpm@linux-foundation.org>,
<davem@davemloft.net>
Subject: [RFC PATCH v2 29/32] kvm: svm: Add support for SEV DEBUG_DECRYPT command
Date: Thu, 2 Mar 2017 10:18:17 -0500 [thread overview]
Message-ID: <148846789744.2349.167641684941925238.stgit@brijesh-build-machine> (raw)
In-Reply-To: <148846752022.2349.13667498174822419498.stgit@brijesh-build-machine>
The command is used to decrypt guest memory region for debug purposes.
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
arch/x86/kvm/svm.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 977aa22..ce8819a 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5986,6 +5986,78 @@ static int sev_guest_status(struct kvm *kvm, struct kvm_sev_cmd *argp)
return ret;
}
+static int __sev_dbg_decrypt_page(struct kvm *kvm, unsigned long src,
+ void *dst, int *error)
+{
+ int ret;
+ struct page **inpages;
+ struct sev_data_dbg *data;
+ unsigned long npages;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ inpages = sev_pin_memory(src, PAGE_SIZE, &npages);
+ if (!inpages) {
+ ret = -ENOMEM;
+ goto err_1;
+ }
+
+ data->handle = sev_get_handle(kvm);
+ data->dst_addr = __psp_pa(dst);
+ data->src_addr = __sev_page_pa(inpages[0]);
+ data->length = PAGE_SIZE;
+
+ ret = sev_issue_cmd(kvm, SEV_CMD_DBG_DECRYPT, data, error);
+ if (ret)
+ printk(KERN_ERR "SEV: DEBUG_DECRYPT %d (%#010x)\n",
+ ret, *error);
+ sev_unpin_memory(inpages, npages);
+err_1:
+ kfree(data);
+ return ret;
+}
+
+static int sev_dbg_decrypt(struct kvm *kvm, struct kvm_sev_cmd *argp)
+{
+ void *data;
+ int ret, offset, len;
+ struct kvm_sev_dbg debug;
+
+ if (!sev_guest(kvm))
+ return -ENOTTY;
+
+ if (copy_from_user(&debug, (void *)argp->data,
+ sizeof(struct kvm_sev_dbg)))
+ return -EFAULT;
+ /*
+ * TODO: add support for decrypting length which crosses the
+ * page boundary.
+ */
+ offset = debug.src_addr & (PAGE_SIZE - 1);
+ if (offset + debug.length > PAGE_SIZE)
+ return -EINVAL;
+
+ data = (void *) get_zeroed_page(GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* decrypt full page */
+ ret = __sev_dbg_decrypt_page(kvm, debug.src_addr & PAGE_MASK,
+ data, &argp->error);
+ if (ret)
+ goto err_1;
+
+ /* we have decrypted full page but copy request length */
+ len = min_t(size_t, (PAGE_SIZE - offset), debug.length);
+ if (copy_to_user((uint8_t *)debug.dst_addr, data + offset, len))
+ ret = -EFAULT;
+err_1:
+ free_page((unsigned long)data);
+ return ret;
+}
+
static int amd_memory_encryption_cmd(struct kvm *kvm, void __user *argp)
{
int r = -ENOTTY;
@@ -6013,6 +6085,10 @@ static int amd_memory_encryption_cmd(struct kvm *kvm, void __user *argp)
r = sev_guest_status(kvm, &sev_cmd);
break;
}
+ case KVM_SEV_DBG_DECRYPT: {
+ r = sev_dbg_decrypt(kvm, &sev_cmd);
+ break;
+ }
default:
break;
}
next prev parent reply other threads:[~2017-03-02 15:18 UTC|newest]
Thread overview: 107+ 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 22:25 ` Paolo Bonzini
2017-03-17 10:17 ` Borislav Petkov
2017-03-17 10:47 ` Paolo Bonzini
2017-03-17 10:56 ` Borislav Petkov
2017-03-17 11:03 ` Paolo Bonzini
2017-03-17 11:33 ` Borislav Petkov
2017-03-17 14:45 ` Paolo Bonzini
2017-03-18 16:37 ` Borislav Petkov
2017-04-06 14:05 ` Brijesh Singh
2017-04-06 17:25 ` Borislav Petkov
2017-04-06 18:37 ` Brijesh Singh
2017-04-07 11:33 ` Borislav Petkov
2017-04-07 14:50 ` Brijesh Singh
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
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 ` Brijesh Singh [this message]
2017-03-16 10:54 ` [RFC PATCH v2 29/32] kvm: svm: Add support for SEV DEBUG_DECRYPT command 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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