From 5441a07a127f106c9936e4f9fa1a8a93e3f31828 Mon Sep 17 00:00:00 2001 From: Brijesh Singh Date: Wed, 28 Jul 2021 10:15:21 -0500 Subject: [PATCH] crypto: ccp - shutdown SEV firmware on kexec The commit 97f9ac3db6612 ("crypto: ccp - Add support for SEV-ES to the PSP driver") added support to allocate Trusted Memory Region (TMR) used during the SEV-ES firmware initialization. The TMR gets locked during the firmware initialization and unlocked during the shutdown. While the TMR is locked, access to it is disallowed. Currently, the CCP driver does not shutdown the firmware during the kexec reboot, leaving the TMR memory locked. Register a callback to shutdown the SEV firmware on the kexec boot. Fixes: 97f9ac3db6612 ("crypto: ccp - Add support for SEV-ES to the PSP driver") Reported-by: Lucas Nussbaum Tested-by: Lucas Nussbaum Cc: Cc: Tom Lendacky Cc: Joerg Roedel Cc: Herbert Xu Cc: David Rientjes Signed-off-by: Brijesh Singh Acked-by: Tom Lendacky Signed-off-by: Herbert Xu --- drivers/crypto/ccp/sev-dev.c | 49 +++++++++++++++++++++----------------------- drivers/crypto/ccp/sp-pci.c | 12 +++++++++++ 2 files changed, 35 insertions(+), 26 deletions(-) diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 91808402e0bf..2ecb0e1f65d8 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -300,6 +300,9 @@ static int __sev_platform_shutdown_locked(int *error) struct sev_device *sev = psp_master->sev_data; int ret; + if (sev->state == SEV_STATE_UNINIT) + return 0; + ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error); if (ret) return ret; @@ -1019,6 +1022,20 @@ e_err: return ret; } +static void sev_firmware_shutdown(struct sev_device *sev) +{ + sev_platform_shutdown(NULL); + + if (sev_es_tmr) { + /* The TMR area was encrypted, flush it from the cache */ + wbinvd_on_all_cpus(); + + free_pages((unsigned long)sev_es_tmr, + get_order(SEV_ES_TMR_SIZE)); + sev_es_tmr = NULL; + } +} + void sev_dev_destroy(struct psp_device *psp) { struct sev_device *sev = psp->sev_data; @@ -1026,6 +1043,8 @@ void sev_dev_destroy(struct psp_device *psp) if (!sev) return; + sev_firmware_shutdown(sev); + if (sev->misc) kref_put(&misc_dev->refcount, sev_exit); @@ -1056,21 +1075,6 @@ void sev_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 (sev->state != SEV_STATE_UNINIT) { - sev_platform_shutdown(NULL); - sev->state = SEV_STATE_UNINIT; - } - if (sev_version_greater_or_equal(0, 15) && sev_update_firmware(sev->dev) == 0) sev_get_api_version(); @@ -1115,17 +1119,10 @@ err: void sev_pci_exit(void) { - if (!psp_master->sev_data) - return; - - sev_platform_shutdown(NULL); + struct sev_device *sev = psp_master->sev_data; - if (sev_es_tmr) { - /* The TMR area was encrypted, flush it from the cache */ - wbinvd_on_all_cpus(); + if (!sev) + return; - free_pages((unsigned long)sev_es_tmr, - get_order(SEV_ES_TMR_SIZE)); - sev_es_tmr = NULL; - } + sev_firmware_shutdown(sev); } diff --git a/drivers/crypto/ccp/sp-pci.c b/drivers/crypto/ccp/sp-pci.c index 6fb6ba35f89d..9bcc1884c06a 100644 --- a/drivers/crypto/ccp/sp-pci.c +++ b/drivers/crypto/ccp/sp-pci.c @@ -241,6 +241,17 @@ e_err: return ret; } +static void sp_pci_shutdown(struct pci_dev *pdev) +{ + struct device *dev = &pdev->dev; + struct sp_device *sp = dev_get_drvdata(dev); + + if (!sp) + return; + + sp_destroy(sp); +} + static void sp_pci_remove(struct pci_dev *pdev) { struct device *dev = &pdev->dev; @@ -371,6 +382,7 @@ static struct pci_driver sp_pci_driver = { .id_table = sp_pci_table, .probe = sp_pci_probe, .remove = sp_pci_remove, + .shutdown = sp_pci_shutdown, .driver.pm = &sp_pci_pm_ops, }; -- 2.11.0