From: Borislav Petkov <bp@suse.de>
To: "Singh, Brijesh" <brijesh.singh@amd.com>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Joerg Roedel" <joro@8bytes.org>,
"Lendacky, Thomas" <Thomas.Lendacky@amd.com>,
"x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 05/11] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command
Date: Tue, 27 Aug 2019 14:09:28 +0200 [thread overview]
Message-ID: <20190827120928.GC27871@zn.tnic> (raw)
In-Reply-To: <20190710201244.25195-6-brijesh.singh@amd.com>
On Wed, Jul 10, 2019 at 08:13:06PM +0000, Singh, Brijesh wrote:
> The command is used for copying the incoming buffer into the
> SEV guest memory space.
...
> +static int sev_receive_update_data(struct kvm *kvm, struct kvm_sev_cmd *argp)
> +{
> + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
> + struct kvm_sev_receive_update_data params;
> + struct sev_data_receive_update_data *data;
> + void *hdr = NULL, *trans = NULL;
> + struct page **guest_page;
> + unsigned long n;
> + int ret, offset;
> +
> + if (!sev_guest(kvm))
> + return -EINVAL;
> +
> + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data,
> + sizeof(struct kvm_sev_receive_update_data)))
> + return -EFAULT;
> +
> + if (!params.hdr_uaddr || !params.hdr_len ||
> + !params.guest_uaddr || !params.guest_len ||
> + !params.trans_uaddr || !params.trans_len)
> + return -EINVAL;
> +
> + /* Check if we are crossing the page boundry */
WARNING: 'boundry' may be misspelled - perhaps 'boundary'?
> + offset = params.guest_uaddr & (PAGE_SIZE - 1);
> + if ((params.guest_len + offset > PAGE_SIZE))
> + return -EINVAL;
> +
> + data = kzalloc(sizeof(*data), GFP_KERNEL);
> + if (!data)
> + return -ENOMEM;
> +
> + hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len);
> + if (IS_ERR(hdr)) {
> + ret = PTR_ERR(hdr);
> + goto e_free;
> + }
> +
> + data->hdr_address = __psp_pa(hdr);
> + data->hdr_len = params.hdr_len;
> +
> + trans = psp_copy_user_blob(params.trans_uaddr, params.trans_len);
> + if (IS_ERR(trans)) {
> + ret = PTR_ERR(trans);
> + goto e_free;
> + }
> +
> + data->trans_address = __psp_pa(trans);
> + data->trans_len = params.trans_len;
> +
> + /* Pin guest memory */
> + ret = -EFAULT;
> + guest_page = sev_pin_memory(kvm, params.guest_uaddr & PAGE_MASK,
> + PAGE_SIZE, &n, 0);
> + if (!guest_page)
> + goto e_free;
> +
> + /* The RECEIVE_UPDATE_DATA command requires C-bit to be always set. */
> + data->guest_address = (page_to_pfn(guest_page[0]) << PAGE_SHIFT) + offset;
> + data->guest_address |= sev_me_mask;
> + data->guest_len = params.guest_len;
> +
> + data->handle = sev->handle;
> + ret = sev_issue_cmd(kvm, SEV_CMD_RECEIVE_UPDATE_DATA, data, &argp->error);
> +
> + sev_unpin_memory(kvm, guest_page, n);
> +e_free:
> + kfree(data);
> + kfree(hdr);
> + kfree(trans);
Pls add separate labels so that you don't have to init function-local
vars above to NULL.
--
Regards/Gruss,
Boris.
SUSE Software Solutions Germany GmbH, GF: Felix Imendörffer, HRB 247165, AG München
next prev parent reply other threads:[~2019-08-27 12:09 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190710201244.25195-1-brijesh.singh@amd.com>
2019-07-10 20:13 ` [PATCH v3 01/11] KVM: SVM: Add KVM_SEV SEND_START command Singh, Brijesh
2019-08-22 10:08 ` Borislav Petkov
2019-08-22 13:23 ` Singh, Brijesh
2019-11-12 18:35 ` Peter Gonda
2019-11-12 22:27 ` Brijesh Singh
2019-11-14 19:27 ` Peter Gonda
2019-11-19 14:06 ` Brijesh Singh
2019-07-10 20:13 ` [PATCH v3 02/11] KVM: SVM: Add KVM_SEND_UPDATE_DATA command Singh, Brijesh
2019-08-22 12:02 ` Borislav Petkov
2019-08-22 13:27 ` Singh, Brijesh
2019-08-22 13:34 ` Borislav Petkov
2019-11-12 22:23 ` Peter Gonda
2019-07-10 20:13 ` [PATCH v3 03/11] KVM: SVM: Add KVM_SEV_SEND_FINISH command Singh, Brijesh
2019-08-26 13:29 ` Borislav Petkov
2019-07-10 20:13 ` [PATCH v3 04/11] KVM: SVM: Add support for KVM_SEV_RECEIVE_START command Singh, Brijesh
2019-07-10 20:13 ` [PATCH v3 05/11] KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command Singh, Brijesh
2019-08-27 12:09 ` Borislav Petkov [this message]
2019-11-14 21:02 ` Peter Gonda
2019-07-10 20:13 ` [PATCH v3 06/11] KVM: SVM: Add KVM_SEV_RECEIVE_FINISH command Singh, Brijesh
2019-08-27 12:19 ` Borislav Petkov
2019-07-10 20:13 ` [PATCH v3 07/11] KVM: x86: Add AMD SEV specific Hypercall3 Singh, Brijesh
2019-07-10 20:13 ` [PATCH v3 08/11] KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall Singh, Brijesh
2019-07-21 20:57 ` David Rientjes
2019-07-22 17:12 ` Cfir Cohen
2019-07-23 15:31 ` Singh, Brijesh
2019-07-23 15:16 ` Singh, Brijesh
2019-11-25 19:07 ` Peter Gonda
2019-07-10 20:13 ` [PATCH v3 09/11] KVM: x86: Introduce KVM_GET_PAGE_ENC_BITMAP ioctl Singh, Brijesh
2019-08-29 16:26 ` Borislav Petkov
2019-08-29 16:41 ` Singh, Brijesh
2019-08-29 16:56 ` Borislav Petkov
2019-07-10 20:13 ` [PATCH v3 10/11] mm: x86: Invoke hypercall when page encryption status is changed Singh, Brijesh
2019-08-29 16:52 ` Borislav Petkov
2019-08-29 18:07 ` Borislav Petkov
2019-08-29 18:21 ` Thomas Gleixner
2019-08-29 18:32 ` Thomas Gleixner
2019-07-10 20:13 ` [PATCH v3 11/11] KVM: x86: Introduce KVM_SET_PAGE_ENC_BITMAP ioctl Singh, Brijesh
2019-11-15 1:22 ` Steve Rutherford
2019-11-15 1:39 ` Steve Rutherford
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