From 64e77c8c047fb91ea8c7800c1238108a72f0bf9c Mon Sep 17 00:00:00 2001 From: Dave Jiang Date: Fri, 7 Dec 2018 14:02:12 -0700 Subject: acpi/nfit, libnvdimm: Add support for issue secure erase DSM to Intel nvdimm Add support to issue a secure erase DSM to the Intel nvdimm. The required passphrase is acquired from an encrypted key in the kernel user keyring. To trigger the action, "erase " is written to the "security" sysfs attribute. Signed-off-by: Dave Jiang Signed-off-by: Dan Williams --- drivers/acpi/nfit/intel.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) (limited to 'drivers/acpi/nfit') diff --git a/drivers/acpi/nfit/intel.c b/drivers/acpi/nfit/intel.c index bb033b74bff0..e0e04b730b4f 100644 --- a/drivers/acpi/nfit/intel.c +++ b/drivers/acpi/nfit/intel.c @@ -203,6 +203,52 @@ static int intel_security_disable(struct nvdimm *nvdimm, return 0; } +static int intel_security_erase(struct nvdimm *nvdimm, + const struct nvdimm_key_data *key) +{ + int rc; + struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm); + struct { + struct nd_cmd_pkg pkg; + struct nd_intel_secure_erase cmd; + } nd_cmd = { + .pkg = { + .nd_family = NVDIMM_FAMILY_INTEL, + .nd_size_in = ND_INTEL_PASSPHRASE_SIZE, + .nd_size_out = ND_INTEL_STATUS_SIZE, + .nd_fw_size = ND_INTEL_STATUS_SIZE, + .nd_command = NVDIMM_INTEL_SECURE_ERASE, + }, + }; + + if (!test_bit(NVDIMM_INTEL_SECURE_ERASE, &nfit_mem->dsm_mask)) + return -ENOTTY; + + /* flush all cache before we erase DIMM */ + nvdimm_invalidate_cache(); + memcpy(nd_cmd.cmd.passphrase, key->data, + sizeof(nd_cmd.cmd.passphrase)); + rc = nvdimm_ctl(nvdimm, ND_CMD_CALL, &nd_cmd, sizeof(nd_cmd), NULL); + if (rc < 0) + return rc; + + switch (nd_cmd.cmd.status) { + case 0: + break; + case ND_INTEL_STATUS_NOT_SUPPORTED: + return -EOPNOTSUPP; + case ND_INTEL_STATUS_INVALID_PASS: + return -EINVAL; + case ND_INTEL_STATUS_INVALID_STATE: + default: + return -ENXIO; + } + + /* DIMM erased, invalidate all CPU caches before we read it */ + nvdimm_invalidate_cache(); + return 0; +} + /* * TODO: define a cross arch wbinvd equivalent when/if * NVDIMM_FAMILY_INTEL command support arrives on another arch. @@ -226,6 +272,7 @@ static const struct nvdimm_security_ops __intel_security_ops = { .disable = intel_security_disable, #ifdef CONFIG_X86 .unlock = intel_security_unlock, + .erase = intel_security_erase, #endif }; -- cgit v1.2.3