On 1/30/19 2:57 PM, Singh, Brijesh wrote:
> A kexec reboot may leave the firmware in INIT or WORKING state.
> Currently, we issue PLATFORM_INIT command during the probe without
> checking the current state. The PLATFORM_INIT command fails if the
> FW is already in INIT state. Lets check the current state, if FW
> is not in UNINIT state then transition it to UNINIT before
> initializing or upgrading the FW.
>
> Signed-off-by: Brijesh Singh <brijesh.si...@amd.com>
> Cc: Tom Lendacky <thomas.lenda...@amd.com>
> Cc: Gary Hook <gary.h...@amd.com>
> ---
> drivers/crypto/ccp/psp-dev.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
Reviewed-by: Tom Lendacky <thomas.lenda...@amd.com>
>
> diff --git a/drivers/crypto/ccp/psp-dev.c b/drivers/crypto/ccp/psp-dev.c
> index b16be8a11d92..966ca6f9cf79 100644
> --- a/drivers/crypto/ccp/psp-dev.c
> +++ b/drivers/crypto/ccp/psp-dev.c
> @@ -437,6 +437,7 @@ static int sev_get_api_version(void)
> psp_master->api_major = status->api_major;
> psp_master->api_minor = status->api_minor;
> psp_master->build = status->build;
> + psp_master->sev_state = status->state;
>
> return 0;
> }
> @@ -964,6 +965,21 @@ void psp_pci_init(void)
> if (sev_get_api_version())
> goto err;
>
> + /*
> + * If platform is not in UNINIT state then firmware upgrade and/or
> + * platform INIT command will fail. These command require UNINIT state.
> + *
> + * In a normal boot we should never run into case where the firmware
> + * is not in UNINIT state on boot. But in case of kexec boot, a reboot
> + * may not go through a typical shutdown sequence and may leave the
> + * firmware in INIT or WORKING state.
> + */
> +
> + if (psp_master->sev_state != SEV_STATE_UNINIT) {
> + sev_platform_shutdown(NULL);
> + psp_master->sev_state = SEV_STATE_UNINIT;
> + }
> +
> if (SEV_VERSION_GREATER_OR_EQUAL(0, 15) &&
> sev_update_firmware(psp_master->dev) == 0)
> sev_get_api_version();
>
