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Date: Wed, 1 Nov 2017 16:15:59 -0500 From: Brijesh Singh <brijesh.singh@....com> To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org Cc: bp@...en8.de, Brijesh Singh <brijesh.singh@....com>, Paolo Bonzini <pbonzini@...hat.com>, Radim Krčmář <rkrcmar@...hat.com>, Borislav Petkov <bp@...e.de>, Herbert Xu <herbert@...dor.apana.org.au>, Gary Hook <gary.hook@....com>, Tom Lendacky <thomas.lendacky@....com>, linux-crypto@...r.kernel.org Subject: [Part2 PATCH v7 14/38] crypto: ccp: Implement SEV_FACTORY_RESET ioctl command 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@...hat.com> Cc: "Radim Krčmář" <rkrcmar@...hat.com> Cc: Borislav Petkov <bp@...e.de> Cc: Herbert Xu <herbert@...dor.apana.org.au> Cc: Gary Hook <gary.hook@....com> Cc: Tom Lendacky <thomas.lendacky@....com> Cc: linux-crypto@...r.kernel.org Cc: kvm@...r.kernel.org Cc: linux-kernel@...r.kernel.org Improvements-by: Borislav Petkov <bp@...e.de> Signed-off-by: Brijesh Singh <brijesh.singh@....com> Acked-by: Gary R Hook <gary.hook@....com> --- drivers/crypto/ccp/psp-dev.c | 70 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 69 insertions(+), 1 deletion(-) diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c index c61ca16096ca..a757bd1c34e8 100644 --- a/drivers/crypto/ccp/psp-dev.c +++ b/drivers/crypto/ccp/psp-dev.c @@ -235,9 +235,77 @@ static int sev_platform_shutdown(int *error) return rc; } +static int sev_platform_state(int *state, int *error) +{ + int rc; + + rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, + psp_master->sev_status, error); + if (rc) + return rc; + + *state = psp_master->sev_status->state; + return rc; +} + +static int sev_ioctl_do_reset(struct sev_issue_cmd *argp) +{ + int state, rc; + + rc = sev_platform_state(&state, &argp->error); + if (rc) + return rc; + + if (state == SEV_STATE_WORKING) { + argp->error = SEV_RET_INVALID_PLATFORM_STATE; + 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 = { -- 2.9.5
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