Messages in this thread | | | Date | Mon, 9 Jan 2023 08:33:09 -0600 | Subject | Re: [PATCH v2] crypto: ccp: Sanitize sev_platform_init() error messages | From | Tom Lendacky <> |
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On 1/8/23 14:24, Jarkko Sakkinen wrote: > The following functions end up calling sev_platform_init() or > __sev_platform_init_locked(): > > * sev_guest_init() > * sev_ioctl_do_pek_csr > * sev_ioctl_do_pdh_export() > * sev_ioctl_do_pek_import() > * sev_ioctl_do_pek_pdh_gen() > * sev_pci_init() > > However, only sev_pci_init() prints out the failed command error code, and > even there the error message does not specify, SEV which command failed.
event there, the error message does not specify which SEV command failed.
> > Address this by printing out the SEV command errors inside > __sev_platform_init_locked(), and differentiate between DF_FLUSH, INIT and > INIT_EX commands. As a side-effect, @error can be removed from the > parameter list. > > This extra information is particularly useful if firmware loading and/or > initialization is going to be made more robust, e.g. by allowing firmware > loading to be postponed. > > Signed-off-by: Jarkko Sakkinen <jarkko@profian.com> > --- > v2: > * Address David Rientjes's feedback: > https://lore.kernel.org/all/6a16bbe4-4281-fb28-78c4-4ec44c8aa679@google.com/ > * Remove @error. > * Remove "SEV_" prefix: it is obvious from context so no need to make klog > line longer. > --- > arch/x86/kvm/svm/sev.c | 2 +- > drivers/crypto/ccp/sev-dev.c | 33 +++++++++++++++++---------------- > include/linux/psp-sev.h | 4 +--- > 3 files changed, 19 insertions(+), 20 deletions(-) > > diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c > index efaaef2b7ae1..42e6bd637896 100644 > --- a/arch/x86/kvm/svm/sev.c > +++ b/arch/x86/kvm/svm/sev.c > @@ -254,7 +254,7 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp) > goto e_no_asid; > sev->asid = asid; > > - ret = sev_platform_init(&argp->error); > + ret = sev_platform_init(); > if (ret) > goto e_free; > > diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c > index 06fc7156c04f..3b66cb1495d4 100644 > --- a/drivers/crypto/ccp/sev-dev.c > +++ b/drivers/crypto/ccp/sev-dev.c > @@ -440,7 +440,7 @@ static int __sev_init_ex_locked(int *error) > return __sev_do_cmd_locked(SEV_CMD_INIT_EX, &data, error); > } > > -static int __sev_platform_init_locked(int *error) > +static int __sev_platform_init_locked(void)
Why is this being removed. Userspace may still want to see this. Some of the error pointers are from the ioctl() arguments...
> { > struct psp_device *psp = psp_master; > struct sev_device *sev; > @@ -476,19 +476,21 @@ static int __sev_platform_init_locked(int *error) > dev_err(sev->dev, "SEV: retrying INIT command because of SECURE_DATA_INVALID error. Retrying once to reset PSP SEV state."); > rc = init_function(&psp_ret); > } > - if (error) > - *error = psp_ret; > - > - if (rc) > + if (rc) { > + dev_err(sev->dev, "SEV: %s failed error %#x", > + sev_init_ex_buffer ? "CMD_INIT_EX" : "CMD_INIT", psp_ret); > return rc; > + } > > sev->state = SEV_STATE_INIT; > > /* Prepare for first SEV guest launch after INIT */ > wbinvd_on_all_cpus(); > - rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error); > - if (rc) > + rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, &psp_ret); > + if (rc) { > + dev_err(sev->dev, "SEV: CMD_DF_FLUSH failed error %#x", psp_ret); > return rc; > + } > > dev_dbg(sev->dev, "SEV firmware initialized\n"); > > @@ -498,12 +500,12 @@ static int __sev_platform_init_locked(int *error) > return 0; > } > > -int sev_platform_init(int *error) > +int sev_platform_init(void) > { > int rc; > > mutex_lock(&sev_cmd_mutex); > - rc = __sev_platform_init_locked(error); > + rc = __sev_platform_init_locked(); > mutex_unlock(&sev_cmd_mutex); > > return rc; > @@ -610,7 +612,7 @@ static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool wr > return -EPERM; > > if (sev->state == SEV_STATE_UNINIT) { > - rc = __sev_platform_init_locked(&argp->error); > + rc = __sev_platform_init_locked();
... like here. So I don't think that should be removed.
Thanks, Tom
> if (rc) > return rc; > } > @@ -653,7 +655,7 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable) > > cmd: > if (sev->state == SEV_STATE_UNINIT) { > - ret = __sev_platform_init_locked(&argp->error); > + ret = __sev_platform_init_locked(); > if (ret) > goto e_free_blob; > } > @@ -849,7 +851,7 @@ static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable) > > /* If platform is not in INIT state then transition it to INIT */ > if (sev->state != SEV_STATE_INIT) { > - ret = __sev_platform_init_locked(&argp->error); > + ret = __sev_platform_init_locked(); > if (ret) > goto e_free_oca; > } > @@ -973,7 +975,7 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable) > if (!writable) > return -EPERM; > > - ret = __sev_platform_init_locked(&argp->error); > + ret = __sev_platform_init_locked(); > if (ret) > return ret; > } > @@ -1335,10 +1337,9 @@ void sev_pci_init(void) > return; > > /* Initialize the platform */ > - rc = sev_platform_init(&error); > + rc = sev_platform_init(); > if (rc) > - dev_err(sev->dev, "SEV: failed to INIT error %#x, rc %d\n", > - error, rc); > + dev_err(sev->dev, "SEV: failed to INIT rc %d\n", rc); > > return; > > diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h > index 1595088c428b..2f8681b753d0 100644 > --- a/include/linux/psp-sev.h > +++ b/include/linux/psp-sev.h > @@ -536,8 +536,6 @@ struct sev_data_attestation_report { > /** > * sev_platform_init - perform SEV INIT command > * > - * @error: SEV command return code > - * > * Returns: > * 0 if the SEV successfully processed the command > * -%ENODEV if the SEV device is not available > @@ -545,7 +543,7 @@ struct sev_data_attestation_report { > * -%ETIMEDOUT if the SEV command timed out > * -%EIO if the SEV returned a non-zero return code > */ > -int sev_platform_init(int *error); > +int sev_platform_init(void); > > /** > * sev_platform_status - perform SEV PLATFORM_STATUS command
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