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KVM: SVM: Add support for SEV LAUNCH_SECRET command 

The command is used for injecting a secret into the guest memory region.

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: "Radim Krčmář" <rkrcmar@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
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Brijesh Singh 2017-12-04 10:57:38 -06:00
parent 7d1594f5d9
commit 9f5b5b950a
1 changed files with 68 additions and 0 deletions
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68
arch/x86/kvm/svm.c
View File

@ -6397,6 +6397,71 @@ err:
return ret;
}
static int sev_launch_secret(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
struct kvm_sev_info *sev = &kvm->arch.sev_info;
struct sev_data_launch_secret *data;
struct kvm_sev_launch_secret params;
struct page **pages;
void *blob, *hdr;
unsigned long n;
int ret;
if (!sev_guest(kvm))
return -ENOTTY;
if (copy_from_user(&params, (void __user *)(uintptr_t)argp->data, sizeof(params)))
return -EFAULT;
pages = sev_pin_memory(kvm, params.guest_uaddr, params.guest_len, &n, 1);
if (!pages)
return -ENOMEM;
/*
* The secret must be copied into contiguous memory region, lets verify
* that userspace memory pages are contiguous before we issue command.
*/
if (get_num_contig_pages(0, pages, n) != n) {
ret = -EINVAL;
goto e_unpin_memory;
}
ret = -ENOMEM;
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data)
goto e_unpin_memory;
blob = psp_copy_user_blob(params.trans_uaddr, params.trans_len);
if (IS_ERR(blob)) {
ret = PTR_ERR(blob);
goto e_free;
}
data->trans_address = __psp_pa(blob);
data->trans_len = params.trans_len;
hdr = psp_copy_user_blob(params.hdr_uaddr, params.hdr_len);
if (IS_ERR(hdr)) {
ret = PTR_ERR(hdr);
goto e_free_blob;
}
data->trans_address = __psp_pa(blob);
data->trans_len = params.trans_len;
data->handle = sev->handle;
ret = sev_issue_cmd(kvm, SEV_CMD_LAUNCH_UPDATE_SECRET, data, &argp->error);
kfree(hdr);
e_free_blob:
kfree(blob);
e_free:
kfree(data);
e_unpin_memory:
sev_unpin_memory(kvm, pages, n);
return ret;
}
static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
{
struct kvm_sev_cmd sev_cmd;
@ -6435,6 +6500,9 @@ static int svm_mem_enc_op(struct kvm *kvm, void __user *argp)
case KVM_SEV_DBG_ENCRYPT:
r = sev_dbg_crypt(kvm, &sev_cmd, false);
break;
case KVM_SEV_LAUNCH_SECRET:
r = sev_launch_secret(kvm, &sev_cmd);
break;
default:
r = -EINVAL;
goto out;