[Part2 PATCH v5 12/31] crypto: ccp: Add Secure Encrypted Virtualization (SEV) command support

From: Brijesh Singh
Date: Wed Oct 04 2017 - 09:22:41 EST

AMDs new Secure Encrypted Virtualization (SEV) feature allows the memory
contents of a virtual machines to be transparently encrypted with a key
unique to the guest VM. The programming and management of the encryption
keys are handled by the AMD Secure Processor (AMD-SP), which exposes the
commands for these tasks. The complete spec is available at:

http://support.amd.com/TechDocs/55766_SEV-KM%20API_Specification.pdf

Extend the AMD-SP driver to provide the following support:

- an in-kernel APIs to communicate with a SEV firmware. The APIs can be
used by the hypervisor to create encryption context for the SEV guests.

- a userspace IOCTL to manage the platform certificates

Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: "Radim KrÄmÃÅ" <rkrcmar@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Gary Hook <gary.hook@xxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Brijesh Singh <brijesh.singh@xxxxxxx>
---
drivers/crypto/ccp/psp-dev.c | 734 +++++++++++++++++++++++++++++++++++++++++++
drivers/crypto/ccp/psp-dev.h | 17 +
include/linux/psp-sev.h | 159 ++++++++++
include/uapi/linux/psp-sev.h | 116 +++++++
4 files changed, 1026 insertions(+)
create mode 100644 include/uapi/linux/psp-sev.h

diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
index 7480d4316239..1b87a699bd3f 100644
--- a/drivers/crypto/ccp/psp-dev.c
+++ b/drivers/crypto/ccp/psp-dev.c
@@ -23,9 +23,20 @@
#include <linux/hw_random.h>
#include <linux/ccp.h>

+#include <uapi/linux/psp-sev.h>
+
#include "sp-dev.h"
#include "psp-dev.h"

+#define DEVICE_NAME "sev"
+
+static unsigned int sev_poll;
+module_param(sev_poll, uint, 0444);
+MODULE_PARM_DESC(sev_poll, "Poll for sev command completion - any non-zero value");
+
+DEFINE_MUTEX(sev_cmd_mutex);
+static bool sev_fops_registered;
+
const struct psp_vdata psp_entry = {
.offset = 0x10500,
};
@@ -49,9 +60,725 @@ static struct psp_device *psp_alloc_struct(struct sp_device *sp)

static irqreturn_t psp_irq_handler(int irq, void *data)
{
+ struct psp_device *psp = data;
+ unsigned int status;
+
+ /* read the interrupt status */
+ status = ioread32(psp->io_regs + PSP_P2CMSG_INTSTS);
+
+ /* check if its command completion */
+ if (status & (1 << PSP_CMD_COMPLETE_REG)) {
+ int reg;
+
+ /* check if its SEV command completion */
+ reg = ioread32(psp->io_regs + PSP_CMDRESP);
+ if (reg & PSP_CMDRESP_RESP) {
+ psp->sev_int_rcvd = 1;
+ wake_up(&psp->sev_int_queue);
+ }
+ }
+
+ /* clear the interrupt status by writing 1 */
+ iowrite32(status, psp->io_regs + PSP_P2CMSG_INTSTS);
+
return IRQ_HANDLED;
}

+static int sev_wait_cmd_poll(struct psp_device *psp, unsigned int timeout,
+ unsigned int *reg)
+{
+ int wait = timeout * 10; /* 100ms sleep => timeout * 10 */
+
+ while (--wait) {
+ msleep(100);
+
+ *reg = ioread32(psp->io_regs + PSP_CMDRESP);
+ if (*reg & PSP_CMDRESP_RESP)
+ break;
+ }
+
+ if (!wait) {
+ dev_err(psp->dev, "sev command timed out\n");
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static int sev_wait_cmd_ioc(struct psp_device *psp, unsigned int *reg)
+{
+ psp->sev_int_rcvd = 0;
+
+ wait_event(psp->sev_int_queue, psp->sev_int_rcvd);
+ *reg = ioread32(psp->io_regs + PSP_CMDRESP);
+
+ return 0;
+}
+
+static int sev_wait_cmd(struct psp_device *psp, unsigned int *reg)
+{
+ return (*reg & PSP_CMDRESP_IOC) ? sev_wait_cmd_ioc(psp, reg)
+ : sev_wait_cmd_poll(psp, 10, reg);
+}
+
+static int sev_cmd_buffer_len(int cmd)
+{
+ switch (cmd) {
+ case SEV_CMD_INIT: return sizeof(struct sev_data_init);
+ case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_data_status);
+ case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr);
+ case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import);
+ case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export);
+ case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start);
+ case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data);
+ case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa);
+ case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish);
+ case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure);
+ case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate);
+ case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate);
+ case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission);
+ case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status);
+ case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg);
+ case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg);
+ case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start);
+ case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data);
+ case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa);
+ case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish);
+ case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start);
+ case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish);
+ case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data);
+ case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa);
+ case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret);
+ default: return 0;
+ }
+
+ return 0;
+}
+
+static int sev_handle_cmd(int cmd, void *data, int *psp_ret)
+{
+ struct sp_device *sp = sp_get_psp_master_device();
+ unsigned int phys_lsb, phys_msb;
+ struct psp_device *psp = sp->psp_data;
+ unsigned int reg, ret;
+
+ if (!psp)
+ return -ENODEV;
+
+ /* Get the physical address of the command buffer */
+ phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0;
+ phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0;
+
+ dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x\n",
+ cmd, phys_msb, phys_lsb);
+ print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data,
+ sev_cmd_buffer_len(cmd), false);
+
+ /* Only one command at a time... */
+ mutex_lock(&sev_cmd_mutex);
+
+ iowrite32(phys_lsb, psp->io_regs + PSP_CMDBUFF_ADDR_LO);
+ iowrite32(phys_msb, psp->io_regs + PSP_CMDBUFF_ADDR_HI);
+
+ reg = cmd;
+ reg <<= PSP_CMDRESP_CMD_SHIFT;
+ reg |= sev_poll ? 0 : PSP_CMDRESP_IOC;
+ iowrite32(reg, psp->io_regs + PSP_CMDRESP);
+
+ ret = sev_wait_cmd(psp, &reg);
+ if (ret)
+ goto unlock;
+
+ if (psp_ret)
+ *psp_ret = reg & PSP_CMDRESP_ERR_MASK;
+
+ if (reg & PSP_CMDRESP_ERR_MASK) {
+ dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n",
+ cmd, reg & PSP_CMDRESP_ERR_MASK);
+ ret = -EIO;
+ }
+
+unlock:
+ mutex_unlock(&sev_cmd_mutex);
+ print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
+ sev_cmd_buffer_len(cmd), false);
+ return ret;
+}
+
+static int sev_platform_get_state(int *state, int *error)
+{
+ struct sev_data_status *data;
+ int ret;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ ret = sev_handle_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
+ if (!ret)
+ *state = data->state;
+
+ kfree(data);
+ return ret;
+}
+
+static int sev_firmware_init(int *error)
+{
+ struct sev_data_init *data;
+ int rc;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ rc = sev_handle_cmd(SEV_CMD_INIT, data, error);
+
+ kfree(data);
+ return rc;
+}
+
+static inline int sev_ioctl_factory_reset(struct sev_issue_cmd *argp)
+{
+ return sev_handle_cmd(SEV_CMD_FACTORY_RESET, 0, &argp->error);
+}
+
+static int sev_ioctl_platform_status(struct sev_issue_cmd *argp)
+{
+ struct sev_user_data_status out;
+ struct sev_data_status *data;
+ int ret;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ ret = sev_handle_cmd(SEV_CMD_PLATFORM_STATUS, data, &argp->error);
+ if (ret)
+ goto e_free;
+
+ out.api_major = data->api_major;
+ out.api_minor = data->api_minor;
+ out.state = data->state;
+ out.owner = data->owner;
+ out.config = data->config;
+ out.build = data->build;
+ out.guest_count = data->guest_count;
+ if (copy_to_user((void __user *)(uintptr_t) argp->data,
+ &out, sizeof(struct sev_user_data_status))) {
+ ret = -EFAULT;
+ goto e_free;
+ }
+
+e_free:
+ kfree(data);
+ return ret;
+}
+
+static void *copy_user_blob(u64 __user uaddr, u32 len)
+{
+ void *data;
+
+ if (!uaddr || !len)
+ return ERR_PTR(-EINVAL);
+
+ /* verify that blob length does not exceed our limit */
+ if (len > SEV_FW_BLOB_MAX_SIZE)
+ return ERR_PTR(-EINVAL);
+
+ data = kmalloc(len, GFP_KERNEL);
+ if (!data)
+ return ERR_PTR(-ENOMEM);
+
+ if (copy_from_user(data, (void __user *)(uintptr_t)uaddr, len))
+ goto e_free;
+
+ return data;
+
+e_free:
+ kfree(data);
+ return ERR_PTR(-EFAULT);
+}
+
+static int sev_ioctl_pek_csr(struct sev_issue_cmd *argp)
+{
+ struct sev_user_data_pek_csr input;
+ struct sev_data_pek_csr *data;
+ int do_shutdown = 0;
+ int ret, state;
+ void *blob;
+
+ if (copy_from_user(&input, (void __user *)(uintptr_t)argp->data,
+ sizeof(struct sev_user_data_pek_csr)))
+ return -EFAULT;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+
+ /* copy the PEK certificate blob from userspace */
+ blob = NULL;
+ if (input.address) {
+ blob = copy_user_blob(input.address, input.length);
+ if (IS_ERR(blob)) {
+ ret = PTR_ERR(blob);
+ goto e_free;
+ }
+
+ data->address = __psp_pa(blob);
+ data->len = input.length;
+ }
+
+ ret = sev_platform_get_state(&state, &argp->error);
+ if (ret)
+ goto e_free_blob;
+
+ /*
+ * PEK_CERT command can be issued only when we are in INIT state.
+ * if current state is WORKING then reject it, if state is UNINIT
+ * then transition the platform to INIT state before issuing the
+ * command.
+ */
+ if (state == SEV_STATE_WORKING) {
+ ret = -EBUSY;
+ goto e_free_blob;
+ } else if (state == SEV_STATE_UNINIT) {
+ ret = sev_firmware_init(&argp->error);
+ if (ret)
+ goto e_free_blob;
+ do_shutdown = 1;
+ }
+
+ ret = sev_handle_cmd(SEV_CMD_PEK_CSR, data, &argp->error);
+
+ input.length = data->len;
+
+ if (copy_to_user((void __user *)(uintptr_t)argp->data, &input,
+ sizeof(struct sev_user_data_pek_csr)))
+ ret = -EFAULT;
+
+ /* transition the plaform into INIT state */
+ if (do_shutdown)
+ sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL);
+
+e_free_blob:
+ kfree(blob);
+e_free:
+ kfree(data);
+ return ret;
+}
+
+static int sev_ioctl_pdh_gen(struct sev_issue_cmd *argp)
+{
+ int ret, state, do_shutdown = 0;
+
+ /*
+ * PDH_GEN command can be issued when platform is in INIT or WORKING
+ * state. If we are in UNINIT state then transition into INIT state
+ * before issuing the command.
+ */
+ ret = sev_platform_get_state(&state, &argp->error);
+ if (ret)
+ return ret;
+
+ if (state == SEV_STATE_UNINIT) {
+ /* transition the plaform into INIT state */
+ ret = sev_firmware_init(&argp->error);
+ if (ret)
+ return ret;
+ do_shutdown = 1;
+ }
+
+ ret = sev_handle_cmd(SEV_CMD_PDH_GEN, 0, &argp->error);
+
+ if (do_shutdown)
+ sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL);
+
+ return ret;
+}
+
+static int sev_ioctl_pek_gen(struct sev_issue_cmd *argp)
+{
+ int do_shutdown = 0;
+ int ret, state;
+
+ /*
+ * PEK_GEN command can be issued only when firmware is in INIT state.
+ * If firmware is in UNINIT state then we transition it into INIT state
+ * and issue the command.
+ */
+ ret = sev_platform_get_state(&state, &argp->error);
+ if (ret)
+ return ret;
+
+ if (state == SEV_STATE_WORKING) {
+ return -EBUSY;
+ } else if (state == SEV_STATE_UNINIT) {
+ /* transition the plaform into INIT state */
+ ret = sev_firmware_init(&argp->error);
+ if (ret)
+ return ret;
+
+ do_shutdown = 1;
+ }
+
+ ret = sev_handle_cmd(SEV_CMD_PEK_GEN, 0, &argp->error);
+
+ if (do_shutdown)
+ sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL);
+
+ return ret;
+}
+
+static int sev_ioctl_pek_cert_import(struct sev_issue_cmd *argp)
+{
+ struct sev_user_data_pek_cert_import input;
+ struct sev_data_pek_cert_import *data;
+ int ret, state, do_shutdown = 0;
+ void *pek_blob, *oca_blob;
+
+ if (copy_from_user(&input, (void __user *)(uintptr_t) argp->data,
+ sizeof(struct sev_user_data_pek_cert_import)))
+ return -EFAULT;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ /* copy PEK certificate blobs from userspace */
+ pek_blob = copy_user_blob(input.pek_cert_address, input.pek_cert_len);
+ if (IS_ERR(pek_blob)) {
+ ret = PTR_ERR(pek_blob);
+ goto e_free;
+ }
+
+ data->pek_cert_address = __psp_pa(pek_blob);
+ data->pek_cert_len = input.pek_cert_len;
+
+ /* copy PEK certificate blobs from userspace */
+ oca_blob = copy_user_blob(input.oca_cert_address, input.oca_cert_len);
+ if (IS_ERR(oca_blob)) {
+ ret = PTR_ERR(oca_blob);
+ goto e_free_pek;
+ }
+
+ data->oca_cert_address = __psp_pa(oca_blob);
+ data->oca_cert_len = input.oca_cert_len;
+
+ ret = sev_platform_get_state(&state, &argp->error);
+ if (ret)
+ goto e_free_oca;
+
+ /*
+ * PEK_CERT_IMPORT command can be issued only when platform is in INIT
+ * state. If we are in UNINIT state then transition into INIT state
+ * before issuing the command.
+ */
+ if (state == SEV_STATE_WORKING) {
+ ret = -EBUSY;
+ goto e_free_oca;
+ } else if (state == SEV_STATE_UNINIT) {
+ /* transition platform init INIT state */
+ ret = sev_firmware_init(&argp->error);
+ if (ret)
+ goto e_free_oca;
+ do_shutdown = 1;
+ }
+
+ ret = sev_handle_cmd(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error);
+
+ if (do_shutdown)
+ sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL);
+
+e_free_oca:
+ kfree(oca_blob);
+e_free_pek:
+ kfree(pek_blob);
+e_free:
+ kfree(data);
+ return ret;
+}
+
+static int sev_ioctl_pdh_cert_export(struct sev_issue_cmd *argp)
+{
+ struct sev_user_data_pdh_cert_export input;
+ struct sev_data_pdh_cert_export *data;
+ int ret, state, need_shutdown = 0;
+ void *pdh_blob, *cert_blob;
+
+ if (copy_from_user(&input, (void __user *)(uintptr_t)argp->data,
+ sizeof(struct sev_user_data_pdh_cert_export)))
+ return -EFAULT;
+
+ data = kzalloc(sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ pdh_blob = NULL;
+ if (input.pdh_cert_address) {
+ if (!access_ok(VERIFY_WRITE, input.pdh_cert_address,
+ input.pdh_cert_len)) {
+ ret = -EFAULT;
+ goto e_free;
+ }
+
+ if (input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) {
+ ret = -EINVAL;
+ goto e_free;
+ }
+
+ pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL);
+ if (!pdh_blob) {
+ ret = -ENOMEM;
+ goto e_free;
+ }
+
+ data->pdh_cert_address = __psp_pa(pdh_blob);
+ data->pdh_cert_len = input.pdh_cert_len;
+ }
+
+ cert_blob = NULL;
+ if (input.cert_chain_address) {
+ if (!access_ok(VERIFY_WRITE, input.cert_chain_address,
+ input.cert_chain_len)) {
+ ret = -EFAULT;
+ goto e_free_pdh;
+ }
+
+ if (input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) {
+ ret = -EINVAL;
+ goto e_free_pdh;
+ }
+
+ cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL);
+ if (!cert_blob) {
+ ret = -ENOMEM;
+ goto e_free_pdh;
+ }
+
+ data->cert_chain_address = __psp_pa(cert_blob);
+ data->cert_chain_len = input.cert_chain_len;
+ }
+
+ ret = sev_platform_get_state(&state, &argp->error);
+ if (ret)
+ goto e_free_cert;
+
+ /*
+ * CERT_EXPORT command can be issued in INIT or WORKING state.
+ * If we are in UNINIT state then transition into INIT state and
+ * shutdown before exiting. But if platform is in WORKING state
+ * then EXPORT the certificate but do not shutdown the platform.
+ */
+ if (state == SEV_STATE_UNINIT) {
+ ret = sev_firmware_init(&argp->error);
+ if (ret)
+ goto e_free_cert;
+
+ need_shutdown = 1;
+ }
+
+ ret = sev_handle_cmd(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error);
+
+ input.cert_chain_len = data->cert_chain_len;
+ input.pdh_cert_len = data->pdh_cert_len;
+
+ /* copy certificate length to userspace */
+ if (copy_to_user((void __user *)(uintptr_t)argp->data, &input,
+ sizeof(struct sev_user_data_pdh_cert_export)))
+ ret = -EFAULT;
+
+ if (ret)
+ goto e_shutdown;
+
+ /* copy PDH certificate to userspace */
+ if (pdh_blob &&
+ copy_to_user((void __user *)(uintptr_t)input.pdh_cert_address,
+ pdh_blob, input.pdh_cert_len)) {
+ ret = -EFAULT;
+ goto e_shutdown;
+ }
+
+ /* copy certificate chain to userspace */
+ if (cert_blob &&
+ copy_to_user((void __user *)(uintptr_t)input.cert_chain_address,
+ cert_blob, input.cert_chain_len)) {
+ ret = -EFAULT;
+ goto e_shutdown;
+ }
+
+e_shutdown:
+ if (need_shutdown)
+ sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, NULL);
+e_free_cert:
+ kfree(cert_blob);
+e_free_pdh:
+ kfree(pdh_blob);
+e_free:
+ kfree(data);
+ return ret;
+}
+
+static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
+{
+ void __user *argp = (void __user *)arg;
+ struct sev_issue_cmd input;
+ int ret = -EFAULT;
+
+ if (ioctl != SEV_ISSUE_CMD)
+ return -EINVAL;
+
+ if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
+ return -EFAULT;
+
+ if (input.cmd > SEV_CMD_MAX)
+ return -EINVAL;
+
+ switch (input.cmd) {
+
+ case SEV_USER_CMD_FACTORY_RESET: {
+ ret = sev_ioctl_factory_reset(&input);
+ break;
+ }
+ case SEV_USER_CMD_PLATFORM_STATUS: {
+ ret = sev_ioctl_platform_status(&input);
+ break;
+ }
+ case SEV_USER_CMD_PEK_GEN: {
+ ret = sev_ioctl_pek_gen(&input);
+ break;
+ }
+ case SEV_USER_CMD_PDH_GEN: {
+ ret = sev_ioctl_pdh_gen(&input);
+ break;
+ }
+ case SEV_USER_CMD_PEK_CSR: {
+ ret = sev_ioctl_pek_csr(&input);
+ break;
+ }
+ case SEV_USER_CMD_PEK_CERT_IMPORT: {
+ ret = sev_ioctl_pek_cert_import(&input);
+ break;
+ }
+ case SEV_USER_CMD_PDH_CERT_EXPORT: {
+ ret = sev_ioctl_pdh_cert_export(&input);
+ break;
+ }
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
+ ret = -EFAULT;
+
+ return ret;
+}
+
+
+const struct file_operations sev_fops = {
+ .owner = THIS_MODULE,
+ .unlocked_ioctl = sev_ioctl,
+};
+
+int sev_platform_init(struct sev_data_init *data, int *error)
+{
+ return sev_handle_cmd(SEV_CMD_INIT, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_platform_init);
+
+int sev_platform_shutdown(int *error)
+{
+ return sev_handle_cmd(SEV_CMD_SHUTDOWN, 0, error);
+}
+EXPORT_SYMBOL_GPL(sev_platform_shutdown);
+
+int sev_platform_status(struct sev_data_status *data, int *error)
+{
+ return sev_handle_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_platform_status);
+
+int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
+ void *data, int *error)
+{
+ if (!filep || filep->f_op != &sev_fops)
+ return -EBADF;
+
+ return sev_handle_cmd(cmd, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
+
+int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
+{
+ return sev_handle_cmd(SEV_CMD_DEACTIVATE, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_guest_deactivate);
+
+int sev_guest_activate(struct sev_data_activate *data, int *error)
+{
+ return sev_handle_cmd(SEV_CMD_ACTIVATE, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_guest_activate);
+
+int sev_guest_decommission(struct sev_data_decommission *data, int *error)
+{
+ return sev_handle_cmd(SEV_CMD_DECOMMISSION, data, error);
+}
+EXPORT_SYMBOL_GPL(sev_guest_decommission);
+
+int sev_guest_df_flush(int *error)
+{
+ return sev_handle_cmd(SEV_CMD_DF_FLUSH, 0, error);
+}
+EXPORT_SYMBOL_GPL(sev_guest_df_flush);
+
+static int sev_ops_init(struct psp_device *psp)
+{
+ struct miscdevice *misc = &psp->sev_misc;
+ int ret = 0;
+
+ /*
+ * SEV feature support can be detected on the multiple devices but the
+ * SEV FW commands must be issued on the master. During probe time we
+ * do not know the master hence we create /dev/sev on the first device
+ * probe. sev_handle_cmd() finds the right master device to when issuing
+ * the command to the firmware.
+ */
+ if (!sev_fops_registered) {
+ misc->minor = MISC_DYNAMIC_MINOR;
+ misc->name = DEVICE_NAME;
+ misc->fops = &sev_fops;
+
+ ret = misc_register(misc);
+ if (!ret) {
+ sev_fops_registered = true;
+ psp->has_sev_fops = true;
+ init_waitqueue_head(&psp->sev_int_queue);
+ dev_info(psp->dev, "registered SEV device\n");
+ }
+ }
+
+ return ret;
+}
+
+static int sev_init(struct psp_device *psp)
+{
+ /* Check if device supports SEV feature */
+ if (!(ioread32(psp->io_regs + PSP_FEATURE_REG) & 1)) {
+ dev_dbg(psp->dev, "device does not support SEV\n");
+ return 1;
+ }
+
+ return sev_ops_init(psp);
+}
+
+static void sev_exit(struct psp_device *psp)
+{
+ if (psp->has_sev_fops)
+ misc_deregister(&psp->sev_misc);
+}
+
int psp_dev_init(struct sp_device *sp)
{
struct device *dev = sp->dev;
@@ -88,11 +815,17 @@ int psp_dev_init(struct sp_device *sp)
if (sp->set_psp_master_device)
sp->set_psp_master_device(sp);

+ ret = sev_init(psp);
+ if (ret)
+ goto e_irq;
+
/* Enable interrupt */
iowrite32(-1, psp->io_regs + PSP_P2CMSG_INTEN);

return 0;

+e_irq:
+ sp_free_psp_irq(psp->sp, psp);
e_err:
sp->psp_data = NULL;

@@ -105,5 +838,6 @@ void psp_dev_destroy(struct sp_device *sp)
{
struct psp_device *psp = sp->psp_data;

+ sev_exit(psp);
sp_free_psp_irq(sp, psp);
}
diff --git a/drivers/crypto/ccp/psp-dev.h b/drivers/crypto/ccp/psp-dev.h
index d53970ef5960..51d3cd966eed 100644
--- a/drivers/crypto/ccp/psp-dev.h
+++ b/drivers/crypto/ccp/psp-dev.h
@@ -25,9 +25,21 @@
#include <linux/interrupt.h>
#include <linux/irqreturn.h>
#include <linux/dmaengine.h>
+#include <linux/psp-sev.h>
+#include <linux/miscdevice.h>

#include "sp-dev.h"

+#define PSP_C2PMSG(_num) ((_num) << 2)
+#define PSP_CMDRESP PSP_C2PMSG(32)
+#define PSP_CMDBUFF_ADDR_LO PSP_C2PMSG(56)
+#define PSP_CMDBUFF_ADDR_HI PSP_C2PMSG(57)
+#define PSP_FEATURE_REG PSP_C2PMSG(63)
+
+#define PSP_P2CMSG(_num) (_num << 2)
+#define PSP_CMD_COMPLETE_REG 1
+#define PSP_CMD_COMPLETE PSP_P2CMSG(PSP_CMD_COMPLETE_REG)
+
#define PSP_P2CMSG_INTEN 0x0110
#define PSP_P2CMSG_INTSTS 0x0114

@@ -54,6 +66,11 @@ struct psp_device {
struct sp_device *sp;

void __iomem *io_regs;
+
+ unsigned int sev_int_rcvd;
+ wait_queue_head_t sev_int_queue;
+ bool has_sev_fops;
+ struct miscdevice sev_misc;
};

extern const struct psp_vdata psp_entry;
diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
index f01d0e3b09b8..ad7708803821 100644
--- a/include/linux/psp-sev.h
+++ b/include/linux/psp-sev.h
@@ -512,4 +512,163 @@ struct __attribute__((__packed__)) sev_data_dbg {
u32 len; /* In */
};

+#if defined(CONFIG_CRYPTO_DEV_SP_PSP)
+
+/**
+ * sev_platform_init - perform SEV INIT command
+ *
+ * @init: sev_data_init structure to be processed
+ * @error: SEV command return code
+ *
+ * Returns:
+ * 0 if the SEV successfully processed the command
+ * -%ENODEV if the SEV device is not available
+ * -%ENOTSUPP if the SEV does not support SEV
+ * -%ETIMEDOUT if the SEV command timed out
+ * -%EIO if the SEV returned a non-zero return code
+ */
+int sev_platform_init(struct sev_data_init *init, int *error);
+
+/**
+ * sev_platform_shutdown - perform SEV SHUTDOWN command
+ *
+ * @error: SEV command return code
+ *
+ * Returns:
+ * 0 if the SEV successfully processed the command
+ * -%ENODEV if the SEV device is not available
+ * -%ENOTSUPP if the SEV does not support SEV
+ * -%ETIMEDOUT if the SEV command timed out
+ * -%EIO if the SEV returned a non-zero return code
+ */
+int sev_platform_shutdown(int *error);
+
+/**
+ * sev_platform_status - perform SEV PLATFORM_STATUS command
+ *
+ * @init: sev_data_status structure to be processed
+ * @error: SEV command return code
+ *
+ * Returns:
+ * 0 if the SEV successfully processed the command
+ * -%ENODEV if the SEV device is not available
+ * -%ENOTSUPP if the SEV does not support SEV
+ * -%ETIMEDOUT if the SEV command timed out
+ * -%EIO if the SEV returned a non-zero return code
+ */
+int sev_platform_status(struct sev_data_status *status, int *error);
+
+/**
+ * sev_issue_cmd_external_user - issue SEV command by other driver with a file
+ * handle.
+ *
+ * The function can be used by other drivers to issue a SEV command on
+ * behalf by userspace. The caller must pass a valid SEV file descriptor
+ * so that we know that caller has access to SEV device.
+ *
+ * @filep - SEV device file pointer
+ * @cmd - command to issue
+ * @data - command buffer
+ * @error: SEV command return code
+ *
+ * Returns:
+ * 0 if the SEV successfully processed the command
+ * -%ENODEV if the SEV device is not available
+ * -%ENOTSUPP if the SEV does not support SEV
+ * -%ETIMEDOUT if the SEV command timed out
+ * -%EIO if the SEV returned a non-zero return code
+ * -%EINVAL if the SEV file descriptor is not valid
+ */
+int sev_issue_cmd_external_user(struct file *filep, unsigned int id,
+ void *data, int *error);
+
+/**
+ * sev_guest_deactivate - perform SEV DEACTIVATE command
+ *
+ * @deactivate: sev_data_deactivate structure to be processed
+ * @sev_ret: sev command return code
+ *
+ * Returns:
+ * 0 if the sev successfully processed the command
+ * -%ENODEV if the sev device is not available
+ * -%ENOTSUPP if the sev does not support SEV
+ * -%ETIMEDOUT if the sev command timed out
+ * -%EIO if the sev returned a non-zero return code
+ */
+int sev_guest_deactivate(struct sev_data_deactivate *data, int *error);
+
+/**
+ * sev_guest_activate - perform SEV ACTIVATE command
+ *
+ * @activate: sev_data_activate structure to be processed
+ * @sev_ret: sev command return code
+ *
+ * Returns:
+ * 0 if the sev successfully processed the command
+ * -%ENODEV if the sev device is not available
+ * -%ENOTSUPP if the sev does not support SEV
+ * -%ETIMEDOUT if the sev command timed out
+ * -%EIO if the sev returned a non-zero return code
+ */
+int sev_guest_activate(struct sev_data_activate *data, int *error);
+
+/**
+ * sev_guest_df_flush - perform SEV DF_FLUSH command
+ *
+ * @sev_ret: sev command return code
+ *
+ * Returns:
+ * 0 if the sev successfully processed the command
+ * -%ENODEV if the sev device is not available
+ * -%ENOTSUPP if the sev does not support SEV
+ * -%ETIMEDOUT if the sev command timed out
+ * -%EIO if the sev returned a non-zero return code
+ */
+int sev_guest_df_flush(int *error);
+
+/**
+ * sev_guest_decommission - perform SEV DECOMMISSION command
+ *
+ * @decommission: sev_data_decommission structure to be processed
+ * @sev_ret: sev command return code
+ *
+ * Returns:
+ * 0 if the sev successfully processed the command
+ * -%ENODEV if the sev device is not available
+ * -%ENOTSUPP if the sev does not support SEV
+ * -%ETIMEDOUT if the sev command timed out
+ * -%EIO if the sev returned a non-zero return code
+ */
+int sev_guest_decommission(struct sev_data_decommission *data, int *error);
+
+#else /* !CONFIG_CRYPTO_DEV_SP_PSP */
+
+static inline int
+sev_platform_status(struct sev_data_status *status, int *error) { return -ENODEV; }
+
+static inline int
+sev_platform_init(struct sev_data_init *init, int *error) { return -ENODEV; }
+
+static inline int sev_platform_shutdown(int *error) { return -ENODEV; }
+
+static inline int
+sev_guest_deactivate(struct sev_data_deactivate *data, int *error) { return -ENODEV; }
+
+static inline int
+sev_guest_decommission(struct sev_data_decommission *data, int *error) { return -ENODEV; }
+
+static inline int
+sev_guest_activate(struct sev_data_activate *data, int *error) { return -ENODEV; }
+
+static inline int sev_guest_df_flush(int *error) { return -ENODEV; }
+
+static inline int
+sev_issue_cmd_external_user(struct file *filep,
+ unsigned int id, void *data, int *error)
+{
+ return -ENODEV;
+}
+
+#endif /* CONFIG_CRYPTO_DEV_SP_PSP */
+
#endif /* __PSP_SEV_H__ */
diff --git a/include/uapi/linux/psp-sev.h b/include/uapi/linux/psp-sev.h
new file mode 100644
index 000000000000..e41e4bed246a
--- /dev/null
+++ b/include/uapi/linux/psp-sev.h
@@ -0,0 +1,116 @@
+
+/*
+ * Userspace interface for AMD Secure Encrypted Virtualization (SEV)
+ * platform management commands.
+ *
+ * Copyright (C) 2016-2017 Advanced Micro Devices, Inc.
+ *
+ * Author: Brijesh Singh <brijesh.singh@xxxxxxx>
+ *
+ * SEV spec 0.14 is available at:
+ * http://support.amd.com/TechDocs/55766_SEV-KM%20API_Specification.pdf
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __PSP_SEV_USER_H__
+#define __PSP_SEV_USER_H__
+
+#include <linux/types.h>
+
+/**
+ * SEV platform commands
+ */
+enum {
+ SEV_USER_CMD_FACTORY_RESET = 0,
+ SEV_USER_CMD_PLATFORM_STATUS,
+ SEV_USER_CMD_PEK_GEN,
+ SEV_USER_CMD_PEK_CSR,
+ SEV_USER_CMD_PDH_GEN,
+ SEV_USER_CMD_PDH_CERT_EXPORT,
+ SEV_USER_CMD_PEK_CERT_IMPORT,
+
+ SEV_USER_CMD_MAX,
+};
+
+/**
+ * struct sev_user_data_status - PLATFORM_STATUS command parameters
+ *
+ * @major: major API version
+ * @minor: minor API version
+ * @state: platform state
+ * @owner: self-owned or externally owned
+ * @config: platform config flags
+ * @build: firmware build id for API version
+ * @guest_count: number of active guests
+ */
+struct sev_user_data_status {
+ __u8 api_major; /* Out */
+ __u8 api_minor; /* Out */
+ __u8 state; /* Out */
+ __u8 owner; /* Out */
+ __u32 config; /* Out */
+ __u8 build; /* Out */
+ __u32 guest_count; /* Out */
+};
+
+/**
+ * struct sev_user_data_pek_csr - PEK_CSR command parameters
+ *
+ * @address: PEK certificate chain
+ * @length: length of certificate
+ */
+struct sev_user_data_pek_csr {
+ __u64 address; /* In */
+ __u32 length; /* In/Out */
+};
+
+/**
+ * struct sev_user_data_cert_import - PEK_CERT_IMPORT command parameters
+ *
+ * @pek_address: PEK certificate chain
+ * @pek_len: length of PEK certificate
+ * @oca_address: OCA certificate chain
+ * @oca_len: length of OCA certificate
+ */
+struct sev_user_data_pek_cert_import {
+ __u64 pek_cert_address; /* In */
+ __u32 pek_cert_len; /* In */
+ __u64 oca_cert_address; /* In */
+ __u32 oca_cert_len; /* In */
+};
+
+/**
+ * struct sev_user_data_pdh_cert_export - PDH_CERT_EXPORT command parameters
+ *
+ * @pdh_address: PDH certificate address
+ * @pdh_len: length of PDH certificate
+ * @cert_chain_address: PDH certificate chain
+ * @cert_chain_len: length of PDH certificate chain
+ */
+struct sev_user_data_pdh_cert_export {
+ __u64 pdh_cert_address; /* In */
+ __u32 pdh_cert_len; /* In/Out */
+ __u64 cert_chain_address; /* In */
+ __u32 cert_chain_len; /* In/Out */
+};
+
+/**
+ * struct sev_issue_cmd - SEV ioctl parameters
+ *
+ * @cmd: SEV commands to execute
+ * @opaque: pointer to the command structure
+ * @error: SEV FW return code on failure
+ */
+struct sev_issue_cmd {
+ __u32 cmd; /* In */
+ __u64 data; /* In */
+ __u32 error; /* Out */
+};
+
+#define SEV_IOC_TYPE 'S'
+#define SEV_ISSUE_CMD _IOWR(SEV_IOC_TYPE, 0x0, struct sev_issue_cmd)
+
+#endif /* __PSP_USER_SEV_H */
--
2.9.5