| Message ID | 20171106181130.68491-15-brijesh.singh@amd.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Delegated to: | Herbert Xu |
| Headers | show |
On 11/06/2017 12:11 PM, Brijesh Singh wrote: > The SEV_FACTORY_RESET command can be used by the platform owner to > reset the non-volatile SEV related data. The command is defined in > SEV spec section 5.4 > > 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> Acked-by: Gary R Hook <gary.hook@amd.com> > --- > drivers/crypto/ccp/psp-dev.c | 77 +++++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 76 insertions(+), 1 deletion(-) > > diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c > index 9915a6c604a3..b49583a45a55 100644 > --- a/drivers/crypto/ccp/psp-dev.c > +++ b/drivers/crypto/ccp/psp-dev.c > @@ -232,9 +232,84 @@ static int sev_platform_shutdown(int *error) > return rc; > } > > +static int sev_get_platform_state(int *state, int *error) > +{ > + int rc; > + > + rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, > + &psp_master->status_cmd_buf, error); > + if (rc) > + return rc; > + > + *state = psp_master->status_cmd_buf.state; > + return rc; > +} > + > +static int sev_ioctl_do_reset(struct sev_issue_cmd *argp) > +{ > + int state, rc; > + > + /* > + * The SEV spec requires that FACTORY_RESET must be issued in > + * UNINIT state. Before we go further lets check if any guest is > + * active. > + * > + * If FW is in WORKING state then deny the request otherwise issue > + * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET. > + * > + */ > + rc = sev_get_platform_state(&state, &argp->error); > + if (rc) > + return rc; > + > + if (state == SEV_STATE_WORKING) > + return -EBUSY; > + > + if (state == SEV_STATE_INIT) { > + rc = __sev_platform_shutdown_locked(&argp->error); > + if (rc) > + return rc; > + } > + > + return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, 0, &argp->error); > +} > + > static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) > { > - return -ENOTTY; > + void __user *argp = (void __user *)arg; > + struct sev_issue_cmd input; > + int ret = -EFAULT; > + > + if (!psp_master) > + return -ENODEV; > + > + if (ioctl != SEV_ISSUE_CMD) > + return -EINVAL; > + > + if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd))) > + return -EFAULT; > + > + if (input.cmd > SEV_MAX) > + return -EINVAL; > + > + mutex_lock(&sev_cmd_mutex); > + > + switch (input.cmd) { > + > + case SEV_FACTORY_RESET: > + ret = sev_ioctl_do_reset(&input); > + break; > + default: > + ret = -EINVAL; > + goto out; > + } > + > + if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd))) > + ret = -EFAULT; > +out: > + mutex_unlock(&sev_cmd_mutex); > + > + return ret; > } > > static const struct file_operations sev_fops = { >
diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c index 9915a6c604a3..b49583a45a55 100644 --- a/drivers/crypto/ccp/psp-dev.c +++ b/drivers/crypto/ccp/psp-dev.c @@ -232,9 +232,84 @@ static int sev_platform_shutdown(int *error) return rc; } +static int sev_get_platform_state(int *state, int *error) +{ + int rc; + + rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, + &psp_master->status_cmd_buf, error); + if (rc) + return rc; + + *state = psp_master->status_cmd_buf.state; + return rc; +} + +static int sev_ioctl_do_reset(struct sev_issue_cmd *argp) +{ + int state, rc; + + /* + * The SEV spec requires that FACTORY_RESET must be issued in + * UNINIT state. Before we go further lets check if any guest is + * active. + * + * If FW is in WORKING state then deny the request otherwise issue + * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET. + * + */ + rc = sev_get_platform_state(&state, &argp->error); + if (rc) + return rc; + + if (state == SEV_STATE_WORKING) + return -EBUSY; + + if (state == SEV_STATE_INIT) { + rc = __sev_platform_shutdown_locked(&argp->error); + if (rc) + return rc; + } + + return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, 0, &argp->error); +} + static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg) { - return -ENOTTY; + void __user *argp = (void __user *)arg; + struct sev_issue_cmd input; + int ret = -EFAULT; + + if (!psp_master) + return -ENODEV; + + if (ioctl != SEV_ISSUE_CMD) + return -EINVAL; + + if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd))) + return -EFAULT; + + if (input.cmd > SEV_MAX) + return -EINVAL; + + mutex_lock(&sev_cmd_mutex); + + switch (input.cmd) { + + case SEV_FACTORY_RESET: + ret = sev_ioctl_do_reset(&input); + break; + default: + ret = -EINVAL; + goto out; + } + + if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd))) + ret = -EFAULT; +out: + mutex_unlock(&sev_cmd_mutex); + + return ret; } static const struct file_operations sev_fops = {
The SEV_FACTORY_RESET command can be used by the platform owner to reset the non-volatile SEV related data. The command is defined in SEV spec section 5.4 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> --- drivers/crypto/ccp/psp-dev.c | 77 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 76 insertions(+), 1 deletion(-)