From d8da2da21fdb1f5964c11c00f0cc84fb0edf31d0 Mon Sep 17 00:00:00 2001 From: Jacky Li Date: Tue, 16 Aug 2022 19:32:08 +0000 Subject: [PATCH] crypto: ccp - Initialize PSP when reading psp data file failed Currently the OS fails the PSP initialization when the file specified at 'init_ex_path' does not exist or has invalid content. However the SEV spec just requires users to allocate 32KB of 0xFF in the file, which can be taken care of by the OS easily. To improve the robustness during the PSP init, leverage the retry mechanism and continue the init process: Before the first INIT_EX call, if the content is invalid or missing, continue the process by feeding those contents into PSP instead of aborting. PSP will then override it with 32KB 0xFF and return SEV_RET_SECURE_DATA_INVALID status code. In the second INIT_EX call, this 32KB 0xFF content will then be fed and PSP will write the valid data to the file. In order to do this, sev_read_init_ex_file should only be called once for the first INIT_EX call. Calling it again for the second INIT_EX call will cause the invalid file content overwriting the valid 32KB 0xFF data provided by PSP in the first INIT_EX call. Co-developed-by: Peter Gonda Signed-off-by: Peter Gonda Signed-off-by: Jacky Li Reported-by: Alper Gun Acked-by: David Rientjes Acked-by: Tom Lendacky Signed-off-by: Herbert Xu --- .../virt/kvm/x86/amd-memory-encryption.rst | 5 ++- drivers/crypto/ccp/sev-dev.c | 36 +++++++++++++--------- 2 files changed, 24 insertions(+), 17 deletions(-) diff --git a/Documentation/virt/kvm/x86/amd-memory-encryption.rst b/Documentation/virt/kvm/x86/amd-memory-encryption.rst index 2d30781..935aaeb 100644 --- a/Documentation/virt/kvm/x86/amd-memory-encryption.rst +++ b/Documentation/virt/kvm/x86/amd-memory-encryption.rst @@ -89,9 +89,8 @@ context. In a typical workflow, this command should be the first command issued. The firmware can be initialized either by using its own non-volatile storage or the OS can manage the NV storage for the firmware using the module parameter -``init_ex_path``. The file specified by ``init_ex_path`` must exist. To create -a new NV storage file allocate the file with 32KB bytes of 0xFF as required by -the SEV spec. +``init_ex_path``. If the file specified by ``init_ex_path`` does not exist or +is invalid, the OS will create or override the file with output from PSP. Returns: 0 on success, -negative on error diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index b292641..8512101f 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -211,18 +211,24 @@ static int sev_read_init_ex_file(void) if (IS_ERR(fp)) { int ret = PTR_ERR(fp); - dev_err(sev->dev, - "SEV: could not open %s for read, error %d\n", - init_ex_path, ret); + if (ret == -ENOENT) { + dev_info(sev->dev, + "SEV: %s does not exist and will be created later.\n", + init_ex_path); + ret = 0; + } else { + dev_err(sev->dev, + "SEV: could not open %s for read, error %d\n", + init_ex_path, ret); + } return ret; } nread = kernel_read(fp, sev_init_ex_buffer, NV_LENGTH, NULL); if (nread != NV_LENGTH) { - dev_err(sev->dev, - "SEV: failed to read %u bytes to non volatile memory area, ret %ld\n", + dev_info(sev->dev, + "SEV: could not read %u bytes to non volatile memory area, ret %ld\n", NV_LENGTH, nread); - return -EIO; } dev_dbg(sev->dev, "SEV: read %ld bytes from NV file\n", nread); @@ -410,17 +416,12 @@ static int __sev_init_locked(int *error) static int __sev_init_ex_locked(int *error) { struct sev_data_init_ex data; - int ret; memset(&data, 0, sizeof(data)); data.length = sizeof(data); data.nv_address = __psp_pa(sev_init_ex_buffer); data.nv_len = NV_LENGTH; - ret = sev_read_init_ex_file(); - if (ret) - return ret; - if (sev_es_tmr) { /* * Do not include the encryption mask on the physical @@ -439,7 +440,7 @@ static int __sev_platform_init_locked(int *error) { struct psp_device *psp = psp_master; struct sev_device *sev; - int rc, psp_ret = -1; + int rc = 0, psp_ret = -1; int (*init_function)(int *error); if (!psp || !psp->sev_data) @@ -450,8 +451,15 @@ static int __sev_platform_init_locked(int *error) if (sev->state == SEV_STATE_INIT) return 0; - init_function = sev_init_ex_buffer ? __sev_init_ex_locked : - __sev_init_locked; + if (sev_init_ex_buffer) { + init_function = __sev_init_ex_locked; + rc = sev_read_init_ex_file(); + if (rc) + return rc; + } else { + init_function = __sev_init_locked; + } + rc = init_function(&psp_ret); if (rc && psp_ret == SEV_RET_SECURE_DATA_INVALID) { /* -- 2.7.4