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KVM: SVM: Add KVM_SEV_RECEIVE_UPDATE_DATA command

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The command is used for copying the incoming buffer into the
SEV guest memory space.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Steve Rutherford <srutherford@google.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Message-Id: <c5d0e3e719db7bb37ea85d79ed4db52e9da06257.1618498113.git.ashish.kalra@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Brijesh Singh 2021-04-15 15:55:17 +00:00 committed by Paolo Bonzini
parent af43cbbf95
commit 15fb7de1a7
3 changed files with 112 additions and 0 deletions
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24
Documentation/virt/kvm/amd-memory-encryption.rst
View File

@ -394,6 +394,30 @@ On success, the 'handle' field contains a new handle and on error, a negative va
For more details, see SEV spec Section 6.12.
16. KVM_SEV_RECEIVE_UPDATE_DATA
----------------------------
The KVM_SEV_RECEIVE_UPDATE_DATA command can be used by the hypervisor to copy
the incoming buffers into the guest memory region with encryption context
created during the KVM_SEV_RECEIVE_START.
Parameters (in): struct kvm_sev_receive_update_data
Returns: 0 on success, -negative on error
::
struct kvm_sev_launch_receive_update_data {
__u64 hdr_uaddr; /* userspace address containing the packet header */
__u32 hdr_len;
__u64 guest_uaddr; /* the destination guest memory region */
__u32 guest_len;
__u64 trans_uaddr; /* the incoming buffer memory region */
__u32 trans_len;
};
References
==========

79
arch/x86/kvm/svm/sev.c
View File

@ -1475,6 +1475,82 @@ e_free_pdh:
return ret;
}
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(&params, (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 boundary */
offset = params.guest_uaddr & (PAGE_SIZE - 1);
if ((params.guest_len + offset > PAGE_SIZE))
return -EINVAL;
hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len);
if (IS_ERR(hdr))
return PTR_ERR(hdr);
trans = psp_copy_user_blob(params.trans_uaddr, params.trans_len);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto e_free_hdr;
}
ret = -ENOMEM;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
goto e_free_trans;
data->hdr_address = __psp_pa(hdr);
data->hdr_len = params.hdr_len;
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);
e_free_trans:
kfree(trans);
e_free_hdr:
kfree(hdr);
return ret;
}
int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
{
struct kvm_sev_cmd sev_cmd;
@ -1552,6 +1628,9 @@ int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
case KVM_SEV_RECEIVE_START:
r = sev_receive_start(kvm, &sev_cmd);
break;
case KVM_SEV_RECEIVE_UPDATE_DATA:
r = sev_receive_update_data(kvm, &sev_cmd);
break;
default:
r = -EINVAL;
goto out;

9
include/uapi/linux/kvm.h
View File

@ -1764,6 +1764,15 @@ struct kvm_sev_receive_start {
__u32 session_len;
};
struct kvm_sev_receive_update_data {
__u64 hdr_uaddr;
__u32 hdr_len;
__u64 guest_uaddr;
__u32 guest_len;
__u64 trans_uaddr;
__u32 trans_len;
};
#define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0)
#define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1)
#define KVM_DEV_ASSIGN_MASK_INTX (1 << 2)