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Date: Mon, 9 Jan 2023 08:33:09 -0600
From: Tom Lendacky <thomas.lendacky@....com>
To: Jarkko Sakkinen <jarkko@...fian.com>,
Sean Christopherson <seanjc@...gle.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
Brijesh Singh <brijesh.singh@....com>,
John Allen <john.allen@....com>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S. Miller" <davem@...emloft.net>
Cc: David Rientjes <rientjes@...gle.com>,
Jarkko Sakkinen <jarkko@...nel.org>,
"open list:KERNEL VIRTUAL MACHINE FOR X86 (KVM/x86)"
<kvm@...r.kernel.org>,
"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<linux-kernel@...r.kernel.org>,
"open list:AMD CRYPTOGRAPHIC COPROCESSOR (CCP) DRIVER - SE..."
<linux-crypto@...r.kernel.org>
Subject: Re: [PATCH v2] crypto: ccp: Sanitize sev_platform_init() error
messages
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@...fian.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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