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crypto: ccp: Add Secure Encrypted Virtualization (SEV) command support
AMD's new Secure Encrypted Virtualization (SEV) feature allows the memory contents of virtual machines to be transparently encrypted with a key unique to the 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 API to communicate with the SEV firmware. The API can be used by the hypervisor to create encryption context for a SEV guest. - a userspace IOCTL to manage the platform certificates. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Borislav Petkov <bp@suse.de> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Gary Hook <gary.hook@amd.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: linux-crypto@vger.kernel.org Cc: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org Improvements-by: Borislav Petkov <bp@suse.de> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
This commit is contained in:
Brijesh Singh
parent
2a6170dfe7
commit
200664d523
5 changed files with 518 additions and 0 deletions
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@ -26,6 +26,12 @@
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#include "sp-dev.h"
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#include "psp-dev.h"
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#define DEVICE_NAME "sev"
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static DEFINE_MUTEX(sev_cmd_mutex);
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static struct sev_misc_dev *misc_dev;
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static struct psp_device *psp_master;
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static struct psp_device *psp_alloc_struct(struct sp_device *sp)
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{
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struct device *dev = sp->dev;
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@ -45,9 +51,285 @@ static struct psp_device *psp_alloc_struct(struct sp_device *sp)
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static irqreturn_t psp_irq_handler(int irq, void *data)
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{
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struct psp_device *psp = data;
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unsigned int status;
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int reg;
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/* Read the interrupt status: */
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status = ioread32(psp->io_regs + PSP_P2CMSG_INTSTS);
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/* Check if it is command completion: */
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if (!(status & BIT(PSP_CMD_COMPLETE_REG)))
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goto done;
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/* Check if it is SEV command completion: */
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reg = ioread32(psp->io_regs + PSP_CMDRESP);
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if (reg & PSP_CMDRESP_RESP) {
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psp->sev_int_rcvd = 1;
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wake_up(&psp->sev_int_queue);
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}
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done:
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/* Clear the interrupt status by writing the same value we read. */
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iowrite32(status, psp->io_regs + PSP_P2CMSG_INTSTS);
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return IRQ_HANDLED;
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}
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static void sev_wait_cmd_ioc(struct psp_device *psp, unsigned int *reg)
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{
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psp->sev_int_rcvd = 0;
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wait_event(psp->sev_int_queue, psp->sev_int_rcvd);
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*reg = ioread32(psp->io_regs + PSP_CMDRESP);
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}
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static int sev_cmd_buffer_len(int cmd)
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{
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switch (cmd) {
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case SEV_CMD_INIT: return sizeof(struct sev_data_init);
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case SEV_CMD_PLATFORM_STATUS: return sizeof(struct sev_user_data_status);
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case SEV_CMD_PEK_CSR: return sizeof(struct sev_data_pek_csr);
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case SEV_CMD_PEK_CERT_IMPORT: return sizeof(struct sev_data_pek_cert_import);
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case SEV_CMD_PDH_CERT_EXPORT: return sizeof(struct sev_data_pdh_cert_export);
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case SEV_CMD_LAUNCH_START: return sizeof(struct sev_data_launch_start);
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case SEV_CMD_LAUNCH_UPDATE_DATA: return sizeof(struct sev_data_launch_update_data);
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case SEV_CMD_LAUNCH_UPDATE_VMSA: return sizeof(struct sev_data_launch_update_vmsa);
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case SEV_CMD_LAUNCH_FINISH: return sizeof(struct sev_data_launch_finish);
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case SEV_CMD_LAUNCH_MEASURE: return sizeof(struct sev_data_launch_measure);
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case SEV_CMD_ACTIVATE: return sizeof(struct sev_data_activate);
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case SEV_CMD_DEACTIVATE: return sizeof(struct sev_data_deactivate);
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case SEV_CMD_DECOMMISSION: return sizeof(struct sev_data_decommission);
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case SEV_CMD_GUEST_STATUS: return sizeof(struct sev_data_guest_status);
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case SEV_CMD_DBG_DECRYPT: return sizeof(struct sev_data_dbg);
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case SEV_CMD_DBG_ENCRYPT: return sizeof(struct sev_data_dbg);
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case SEV_CMD_SEND_START: return sizeof(struct sev_data_send_start);
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case SEV_CMD_SEND_UPDATE_DATA: return sizeof(struct sev_data_send_update_data);
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case SEV_CMD_SEND_UPDATE_VMSA: return sizeof(struct sev_data_send_update_vmsa);
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case SEV_CMD_SEND_FINISH: return sizeof(struct sev_data_send_finish);
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case SEV_CMD_RECEIVE_START: return sizeof(struct sev_data_receive_start);
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case SEV_CMD_RECEIVE_FINISH: return sizeof(struct sev_data_receive_finish);
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case SEV_CMD_RECEIVE_UPDATE_DATA: return sizeof(struct sev_data_receive_update_data);
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case SEV_CMD_RECEIVE_UPDATE_VMSA: return sizeof(struct sev_data_receive_update_vmsa);
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case SEV_CMD_LAUNCH_UPDATE_SECRET: return sizeof(struct sev_data_launch_secret);
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default: return 0;
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}
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return 0;
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}
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static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
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{
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struct psp_device *psp = psp_master;
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unsigned int phys_lsb, phys_msb;
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unsigned int reg, ret = 0;
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if (!psp)
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return -ENODEV;
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/* Get the physical address of the command buffer */
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phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0;
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phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0;
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dev_dbg(psp->dev, "sev command id %#x buffer 0x%08x%08x\n",
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cmd, phys_msb, phys_lsb);
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print_hex_dump_debug("(in): ", DUMP_PREFIX_OFFSET, 16, 2, data,
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sev_cmd_buffer_len(cmd), false);
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iowrite32(phys_lsb, psp->io_regs + PSP_CMDBUFF_ADDR_LO);
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iowrite32(phys_msb, psp->io_regs + PSP_CMDBUFF_ADDR_HI);
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reg = cmd;
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reg <<= PSP_CMDRESP_CMD_SHIFT;
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reg |= PSP_CMDRESP_IOC;
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iowrite32(reg, psp->io_regs + PSP_CMDRESP);
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/* wait for command completion */
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sev_wait_cmd_ioc(psp, ®);
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if (psp_ret)
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*psp_ret = reg & PSP_CMDRESP_ERR_MASK;
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if (reg & PSP_CMDRESP_ERR_MASK) {
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dev_dbg(psp->dev, "sev command %#x failed (%#010x)\n",
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cmd, reg & PSP_CMDRESP_ERR_MASK);
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ret = -EIO;
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}
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print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
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sev_cmd_buffer_len(cmd), false);
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return ret;
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}
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static int sev_do_cmd(int cmd, void *data, int *psp_ret)
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{
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int rc;
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mutex_lock(&sev_cmd_mutex);
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rc = __sev_do_cmd_locked(cmd, data, psp_ret);
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mutex_unlock(&sev_cmd_mutex);
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return rc;
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}
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static int __sev_platform_init_locked(int *error)
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{
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struct psp_device *psp = psp_master;
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int rc = 0;
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if (!psp)
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return -ENODEV;
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if (psp->sev_state == SEV_STATE_INIT)
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return 0;
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rc = __sev_do_cmd_locked(SEV_CMD_INIT, &psp->init_cmd_buf, error);
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if (rc)
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return rc;
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psp->sev_state = SEV_STATE_INIT;
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dev_dbg(psp->dev, "SEV firmware initialized\n");
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return rc;
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}
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int sev_platform_init(int *error)
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{
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int rc;
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mutex_lock(&sev_cmd_mutex);
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rc = __sev_platform_init_locked(error);
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mutex_unlock(&sev_cmd_mutex);
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return rc;
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}
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EXPORT_SYMBOL_GPL(sev_platform_init);
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static int __sev_platform_shutdown_locked(int *error)
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{
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int ret;
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ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, 0, error);
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if (ret)
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return ret;
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psp_master->sev_state = SEV_STATE_UNINIT;
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dev_dbg(psp_master->dev, "SEV firmware shutdown\n");
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return ret;
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}
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static int sev_platform_shutdown(int *error)
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{
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int rc;
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mutex_lock(&sev_cmd_mutex);
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rc = __sev_platform_shutdown_locked(NULL);
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mutex_unlock(&sev_cmd_mutex);
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return rc;
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}
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static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
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{
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return -ENOTTY;
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}
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static const struct file_operations sev_fops = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = sev_ioctl,
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};
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int sev_platform_status(struct sev_user_data_status *data, int *error)
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{
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return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
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}
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EXPORT_SYMBOL_GPL(sev_platform_status);
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int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
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{
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return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
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}
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EXPORT_SYMBOL_GPL(sev_guest_deactivate);
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int sev_guest_activate(struct sev_data_activate *data, int *error)
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{
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return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
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}
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EXPORT_SYMBOL_GPL(sev_guest_activate);
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int sev_guest_decommission(struct sev_data_decommission *data, int *error)
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{
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return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
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}
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EXPORT_SYMBOL_GPL(sev_guest_decommission);
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int sev_guest_df_flush(int *error)
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{
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return sev_do_cmd(SEV_CMD_DF_FLUSH, 0, error);
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}
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EXPORT_SYMBOL_GPL(sev_guest_df_flush);
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static void sev_exit(struct kref *ref)
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{
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struct sev_misc_dev *misc_dev = container_of(ref, struct sev_misc_dev, refcount);
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misc_deregister(&misc_dev->misc);
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}
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static int sev_misc_init(struct psp_device *psp)
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{
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struct device *dev = psp->dev;
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int ret;
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/*
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* SEV feature support can be detected on multiple devices but the SEV
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* FW commands must be issued on the master. During probe, we do not
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* know the master hence we create /dev/sev on the first device probe.
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* sev_do_cmd() finds the right master device to which to issue the
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* command to the firmware.
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*/
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if (!misc_dev) {
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struct miscdevice *misc;
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misc_dev = devm_kzalloc(dev, sizeof(*misc_dev), GFP_KERNEL);
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if (!misc_dev)
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return -ENOMEM;
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misc = &misc_dev->misc;
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misc->minor = MISC_DYNAMIC_MINOR;
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misc->name = DEVICE_NAME;
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misc->fops = &sev_fops;
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ret = misc_register(misc);
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if (ret)
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return ret;
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kref_init(&misc_dev->refcount);
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} else {
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kref_get(&misc_dev->refcount);
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}
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init_waitqueue_head(&psp->sev_int_queue);
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psp->sev_misc = misc_dev;
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dev_dbg(dev, "registered SEV device\n");
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return 0;
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}
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static int sev_init(struct psp_device *psp)
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{
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/* Check if device supports SEV feature */
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if (!(ioread32(psp->io_regs + PSP_FEATURE_REG) & 1)) {
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dev_dbg(psp->dev, "device does not support SEV\n");
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return 1;
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}
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return sev_misc_init(psp);
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}
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int psp_dev_init(struct sp_device *sp)
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{
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struct device *dev = sp->dev;
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@ -81,6 +363,10 @@ int psp_dev_init(struct sp_device *sp)
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goto e_err;
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}
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ret = sev_init(psp);
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if (ret)
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goto e_irq;
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if (sp->set_psp_master_device)
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sp->set_psp_master_device(sp);
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@ -89,6 +375,8 @@ int psp_dev_init(struct sp_device *sp)
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return 0;
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e_irq:
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sp_free_psp_irq(psp->sp, psp);
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e_err:
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sp->psp_data = NULL;
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@ -101,5 +389,61 @@ void psp_dev_destroy(struct sp_device *sp)
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{
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struct psp_device *psp = sp->psp_data;
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if (psp->sev_misc)
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kref_put(&misc_dev->refcount, sev_exit);
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sp_free_psp_irq(sp, psp);
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}
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int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
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void *data, int *error)
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{
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if (!filep || filep->f_op != &sev_fops)
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return -EBADF;
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return sev_do_cmd(cmd, data, error);
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}
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EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
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void psp_pci_init(void)
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{
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struct sev_user_data_status *status;
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struct sp_device *sp;
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int error, rc;
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sp = sp_get_psp_master_device();
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if (!sp)
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return;
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psp_master = sp->psp_data;
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/* Initialize the platform */
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rc = sev_platform_init(&error);
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if (rc) {
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dev_err(sp->dev, "SEV: failed to INIT error %#x\n", error);
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goto err;
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}
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/* Display SEV firmware version */
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status = &psp_master->status_cmd_buf;
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rc = sev_platform_status(status, &error);
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if (rc) {
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dev_err(sp->dev, "SEV: failed to get status error %#x\n", error);
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goto err;
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}
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dev_info(sp->dev, "SEV API:%d.%d build:%d\n", status->api_major,
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status->api_minor, status->build);
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return;
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err:
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psp_master = NULL;
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}
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void psp_pci_exit(void)
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{
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if (!psp_master)
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return;
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sev_platform_shutdown(NULL);
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}
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@ -25,9 +25,21 @@
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#include <linux/interrupt.h>
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#include <linux/irqreturn.h>
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#include <linux/dmaengine.h>
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#include <linux/psp-sev.h>
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#include <linux/miscdevice.h>
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#include "sp-dev.h"
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#define PSP_C2PMSG(_num) ((_num) << 2)
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#define PSP_CMDRESP PSP_C2PMSG(32)
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#define PSP_CMDBUFF_ADDR_LO PSP_C2PMSG(56)
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#define PSP_CMDBUFF_ADDR_HI PSP_C2PMSG(57)
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#define PSP_FEATURE_REG PSP_C2PMSG(63)
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#define PSP_P2CMSG(_num) ((_num) << 2)
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#define PSP_CMD_COMPLETE_REG 1
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#define PSP_CMD_COMPLETE PSP_P2CMSG(PSP_CMD_COMPLETE_REG)
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#define PSP_P2CMSG_INTEN 0x0110
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#define PSP_P2CMSG_INTSTS 0x0114
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@ -44,6 +56,11 @@
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#define MAX_PSP_NAME_LEN 16
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struct sev_misc_dev {
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struct kref refcount;
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struct miscdevice misc;
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};
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struct psp_device {
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struct list_head entry;
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@ -54,6 +71,13 @@ struct psp_device {
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struct sp_device *sp;
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void __iomem *io_regs;
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int sev_state;
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unsigned int sev_int_rcvd;
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wait_queue_head_t sev_int_queue;
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struct sev_misc_dev *sev_misc;
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struct sev_user_data_status status_cmd_buf;
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struct sev_data_init init_cmd_buf;
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};
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#endif /* __PSP_DEV_H */
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@ -272,6 +272,10 @@ static int __init sp_mod_init(void)
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if (ret)
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return ret;
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#ifdef CONFIG_CRYPTO_DEV_SP_PSP
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psp_pci_init();
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#endif
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return 0;
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#endif
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|
|
@ -291,6 +295,11 @@ static int __init sp_mod_init(void)
|
|||
static void __exit sp_mod_exit(void)
|
||||
{
|
||||
#ifdef CONFIG_X86
|
||||
|
||||
#ifdef CONFIG_CRYPTO_DEV_SP_PSP
|
||||
psp_pci_exit();
|
||||
#endif
|
||||
|
||||
sp_pci_exit();
|
||||
#endif
|
||||
|
||||
|
|
|
|||
|
|
@ -143,12 +143,16 @@ static inline int ccp_dev_resume(struct sp_device *sp)
|
|||
#ifdef CONFIG_CRYPTO_DEV_SP_PSP
|
||||
|
||||
int psp_dev_init(struct sp_device *sp);
|
||||
void psp_pci_init(void);
|
||||
void psp_dev_destroy(struct sp_device *sp);
|
||||
void psp_pci_exit(void);
|
||||
|
||||
#else /* !CONFIG_CRYPTO_DEV_SP_PSP */
|
||||
|
||||
static inline int psp_dev_init(struct sp_device *sp) { return 0; }
|
||||
static inline void psp_pci_init(void) { }
|
||||
static inline void psp_dev_destroy(struct sp_device *sp) { }
|
||||
static inline void psp_pci_exit(void) { }
|
||||
|
||||
#endif /* CONFIG_CRYPTO_DEV_SP_PSP */
|
||||
|
||||
|
|
|
|||
|
|
@ -462,4 +462,141 @@ struct sev_data_dbg {
|
|||
u32 len; /* In */
|
||||
} __packed;
|
||||
|
||||
#ifdef CONFIG_CRYPTO_DEV_SP_PSP
|
||||
|
||||
/**
|
||||
* sev_platform_init - perform SEV INIT 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_init(int *error);
|
||||
|
||||
/**
|
||||
* sev_platform_status - perform SEV PLATFORM_STATUS command
|
||||
*
|
||||
* @status: sev_user_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_user_data_status *status, int *error);
|
||||
|
||||
/**
|
||||
* sev_issue_cmd_external_user - issue SEV command by other driver with a file
|
||||
* handle.
|
||||
*
|
||||
* This function can be used by other drivers to issue a SEV command on
|
||||
* behalf of userspace. The caller must pass a valid SEV file descriptor
|
||||
* so that we know that it 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_user_data_status *status, int *error) { return -ENODEV; }
|
||||
|
||||
static inline int sev_platform_init(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__ */
|
||||
|
|
|
|||
Loading…
Reference in a new issue