From: "Kalra, Ashish" <ashish.kalra@amd.com>
To: Alexey Kardashevskiy <aik@amd.com>,
seanjc@google.com, pbonzini@redhat.com, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com,
x86@kernel.org, hpa@zytor.com, thomas.lendacky@amd.com,
john.allen@amd.com, herbert@gondor.apana.org.au,
davem@davemloft.net
Cc: michael.roth@amd.com, dionnaglaze@google.com,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-crypto@vger.kernel.org, linux-coco@lists.linux.dev
Subject: Re: [PATCH v3 2/7] crypto: ccp: Fix implicit SEV/SNP init and shutdown in ioctls
Date: Tue, 7 Jan 2025 12:53:38 -0600 [thread overview]
Message-ID: <5391cdaa-ac29-4964-b2d6-59d2ba38d35d@amd.com> (raw)
In-Reply-To: <a6cfdfe5-37b5-4d86-9a97-ac75720ad424@amd.com>
On 1/6/2025 9:29 PM, Alexey Kardashevskiy wrote:
> On 4/1/25 07:00, Ashish Kalra wrote:
>> From: Ashish Kalra <ashish.kalra@amd.com>
>>
>> Modify the behavior of implicit SEV initialization in some of the
>> SEV ioctls to do both SEV initialization and shutdown and adds
>> implicit SNP initialization and shutdown to some of the SNP ioctls
>> so that the change of SEV/SNP platform initialization not being
>> done during PSP driver probe time does not break userspace tools
>> such as sevtool, etc.
>>
>> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
>> ---
>> drivers/crypto/ccp/sev-dev.c | 149 +++++++++++++++++++++++++++++------
>> 1 file changed, 125 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
>> index 1c1c33d3ed9a..0ec2e8191583 100644
>> --- a/drivers/crypto/ccp/sev-dev.c
>> +++ b/drivers/crypto/ccp/sev-dev.c
>> @@ -1454,7 +1454,8 @@ static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
>> static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable)
>> {
>> struct sev_device *sev = psp_master->sev_data;
>> - int rc;
>> + bool shutdown_required = false;
>> + int rc, ret, error;
>> if (!writable)
>> return -EPERM;
>> @@ -1463,19 +1464,30 @@ static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool wr
>> rc = __sev_platform_init_locked(&argp->error);
>> if (rc)
>> return rc;
>> + shutdown_required = true;
>> + }
>> +
>> + rc = __sev_do_cmd_locked(cmd, NULL, &argp->error);
>> +
>> + if (shutdown_required) {
>> + ret = __sev_platform_shutdown_locked(&error);
>> + if (ret)
>> + dev_err(sev->dev, "SEV: failed to SHUTDOWN error %#x, rc %d\n",
>> + error, ret);
>> }
>> - return __sev_do_cmd_locked(cmd, NULL, &argp->error);
>> + return rc;
>> }
>> static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
>> {
>> struct sev_device *sev = psp_master->sev_data;
>> struct sev_user_data_pek_csr input;
>> + bool shutdown_required = false;
>> struct sev_data_pek_csr data;
>> void __user *input_address;
>> + int ret, rc, error;
>> void *blob = NULL;
>> - int ret;
>> if (!writable)
>> return -EPERM;
>> @@ -1506,6 +1518,7 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
>> ret = __sev_platform_init_locked(&argp->error);
>> if (ret)
>> goto e_free_blob;
>> + shutdown_required = true;
>> }
>> ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, &data, &argp->error);
>> @@ -1524,6 +1537,13 @@ static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
>> }
>> e_free_blob:
>> + if (shutdown_required) {
>> + rc = __sev_platform_shutdown_locked(&error);
>> + if (rc)
>> + dev_err(sev->dev, "SEV: failed to SHUTDOWN error %#x, rc %d\n",
>> + error, rc);
>> + }
>> +
>> kfree(blob);
>> return ret;
>> }
>> @@ -1739,8 +1759,9 @@ static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
>> struct sev_device *sev = psp_master->sev_data;
>> struct sev_user_data_pek_cert_import input;
>> struct sev_data_pek_cert_import data;
>> + bool shutdown_required = false;
>> void *pek_blob, *oca_blob;
>> - int ret;
>> + int ret, rc, error;
>> if (!writable)
>> return -EPERM;
>> @@ -1772,11 +1793,19 @@ static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
>> ret = __sev_platform_init_locked(&argp->error);
>> if (ret)
>> goto e_free_oca;
>> + shutdown_required = true;
>> }
>> ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, &data, &argp->error);
>> e_free_oca:
>> + if (shutdown_required) {
>> + rc = __sev_platform_shutdown_locked(&error);
>> + if (rc)
>> + dev_err(sev->dev, "SEV: failed to SHUTDOWN error %#x, rc %d\n",
>> + error, rc);
>> + }
>> +
>> kfree(oca_blob);
>> e_free_pek:
>> kfree(pek_blob);
>> @@ -1893,17 +1922,8 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
>> struct sev_data_pdh_cert_export data;
>> void __user *input_cert_chain_address;
>> void __user *input_pdh_cert_address;
>> - int ret;
>> -
>> - /* If platform is not in INIT state then transition it to INIT. */
>> - if (sev->state != SEV_STATE_INIT) {
>> - if (!writable)
>> - return -EPERM;
>> -
>> - ret = __sev_platform_init_locked(&argp->error);
>> - if (ret)
>> - return ret;
>> - }
>> + bool shutdown_required = false;
>> + int ret, rc, error;
>> if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
>> return -EFAULT;
>> @@ -1944,6 +1964,16 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
>> data.cert_chain_len = input.cert_chain_len;
>> cmd:
>> + /* If platform is not in INIT state then transition it to INIT. */
>> + if (sev->state != SEV_STATE_INIT) {
>> + if (!writable)
>> + return -EPERM;
>
> same comment as in v2:
>
> goto e_free_cert, not return, otherwise leaks memory.
>
>
>
>> + ret = __sev_platform_init_locked(&argp->error);
>> + if (ret)
>> + goto e_free_cert;
>> + shutdown_required = true;
>> + }
>> +
>> ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, &data, &argp->error);
>> /* If we query the length, FW responded with expected data. */
>> @@ -1970,6 +2000,13 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
>> }
>> e_free_cert:
>> + if (shutdown_required) {
>> + rc = __sev_platform_shutdown_locked(&error);
>> + if (rc)
>> + dev_err(sev->dev, "SEV: failed to SHUTDOWN error %#x, rc %d\n",
>> + error, rc);
>> + }
>> +
>> kfree(cert_blob);
>> e_free_pdh:
>> kfree(pdh_blob);
>> @@ -1979,12 +2016,13 @@ static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
>> static int sev_ioctl_do_snp_platform_status(struct sev_issue_cmd *argp)
>> {
>> struct sev_device *sev = psp_master->sev_data;
>> + bool shutdown_required = false;
>> struct sev_data_snp_addr buf;
>> struct page *status_page;
>> + int ret, rc, error;
>> void *data;
>> - int ret;
>> - if (!sev->snp_initialized || !argp->data)
>> + if (!argp->data)
>> return -EINVAL;
>> status_page = alloc_page(GFP_KERNEL_ACCOUNT);
>> @@ -1993,6 +2031,13 @@ static int sev_ioctl_do_snp_platform_status(struct sev_issue_cmd *argp)
>> data = page_address(status_page);
>> + if (!sev->snp_initialized) {
>> + ret = __sev_snp_init_locked(&argp->error);
>> + if (ret)
>> + goto cleanup;
>> + shutdown_required = true;
>> + }
>> +
>> /*
>> * Firmware expects status page to be in firmware-owned state, otherwise
>> * it will report firmware error code INVALID_PAGE_STATE (0x1A).
>> @@ -2021,6 +2066,13 @@ static int sev_ioctl_do_snp_platform_status(struct sev_issue_cmd *argp)
>> ret = -EFAULT;
>> cleanup:
>> + if (shutdown_required) {
>> + rc = __sev_snp_shutdown_locked(&error, false);
>> + if (rc)
>> + dev_err(sev->dev, "SEV-SNP: failed to SHUTDOWN error %#x, rc %d\n",
>> + error, rc);
>> + }
>> +
>> __free_pages(status_page, 0);
>> return ret;
>> }
>> @@ -2029,21 +2081,38 @@ static int sev_ioctl_do_snp_commit(struct sev_issue_cmd *argp)
>> {
>> struct sev_device *sev = psp_master->sev_data;
>> struct sev_data_snp_commit buf;
>> + bool shutdown_required = false;
>> + int ret, rc, error;
>> - if (!sev->snp_initialized)
>> - return -EINVAL;
>> + if (!sev->snp_initialized) {
>> + ret = __sev_snp_init_locked(&argp->error);
>> + if (ret)
>> + return ret;
>> + shutdown_required = true;
>> + }
>> buf.len = sizeof(buf);
>> - return __sev_do_cmd_locked(SEV_CMD_SNP_COMMIT, &buf, &argp->error);
>> + ret = __sev_do_cmd_locked(SEV_CMD_SNP_COMMIT, &buf, &argp->error);
>> +
>> + if (shutdown_required) {
>> + rc = __sev_snp_shutdown_locked(&error, false);
>> + if (rc)
>> + dev_err(sev->dev, "SEV-SNP: failed to SHUTDOWN error %#x, rc %d\n",
>> + error, rc);
>> + }
>> +
>> + return ret;
>> }
>> static int sev_ioctl_do_snp_set_config(struct sev_issue_cmd *argp, bool writable)
>> {
>> struct sev_device *sev = psp_master->sev_data;
>> struct sev_user_data_snp_config config;
>> + bool shutdown_required = false;
>> + int ret, rc, error;
>> - if (!sev->snp_initialized || !argp->data)
>> + if (!argp->data)
>> return -EINVAL;
>> if (!writable)
>> @@ -2052,17 +2121,34 @@ static int sev_ioctl_do_snp_set_config(struct sev_issue_cmd *argp, bool writable
>> if (copy_from_user(&config, (void __user *)argp->data, sizeof(config)))
>> return -EFAULT;
>> - return __sev_do_cmd_locked(SEV_CMD_SNP_CONFIG, &config, &argp->error);
>> + if (!sev->snp_initialized) {
>> + ret = __sev_snp_init_locked(&argp->error);
>> + if (ret)
>> + return ret;
>> + shutdown_required = true;
>> + }
>> +
>> + ret = __sev_do_cmd_locked(SEV_CMD_SNP_CONFIG, &config, &argp->error);
>> +
>> + if (shutdown_required) {
>> + rc = __sev_snp_shutdown_locked(&error, false);
>> + if (rc)
>> + dev_err(sev->dev, "SEV-SNP: failed to SHUTDOWN error %#x, rc %d\n",
>> + error, rc);
>> + }
>> +
>> + return ret;
>> }
>> static int sev_ioctl_do_snp_vlek_load(struct sev_issue_cmd *argp, bool writable)
>> {
>> struct sev_device *sev = psp_master->sev_data;
>> struct sev_user_data_snp_vlek_load input;
>> + bool shutdown_required = false;
>> + int ret, rc, error;
>> void *blob;
>> - int ret;
>> - if (!sev->snp_initialized || !argp->data)
>> + if (!argp->data)
>> return -EINVAL;
>> if (!writable)
>> @@ -2081,8 +2167,23 @@ static int sev_ioctl_do_snp_vlek_load(struct sev_issue_cmd *argp, bool writable)
>> input.vlek_wrapped_address = __psp_pa(blob);
>> + if (!sev->snp_initialized) {
>> + ret = __sev_snp_init_locked(&argp->error);
>> + if (ret)
>> + goto cleanup;
>> + shutdown_required = true;
>> + }
>> +
>> ret = __sev_do_cmd_locked(SEV_CMD_SNP_VLEK_LOAD, &input, &argp->error);
>> + if (shutdown_required) {
>> + rc = __sev_snp_shutdown_locked(&error, false);
>> + if (rc)
>> + dev_err(sev->dev, "SEV-SNP: failed to SHUTDOWN error %#x, rc %d\n",
>> + error, rc);
>> + }
>> +
>
> same comment as in v2:
>
>
> It is the same template 8 (?) times, I'd declare rc and error inside the "if (shutdown_required)" scope or even drop them and error messages as __sev_snp_shutdown_locked() prints dev_err() anyway.
>
> if (shutdown_required)
> __sev_snp_shutdown_locked(&error, false);
>
> and that's it. Thanks,
Yes, makes sense to use the dev_err() in __sev_snp_shutdown_locked() as that is the whole purpose of the first patch in this series, but will
still have to declare error as a local as we can't use argp->error here.
Thanks,
Ashish
>
>> +cleanup:
>> kfree(blob);
>> return ret;
>
next prev parent reply other threads:[~2025-01-07 18:53 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-03 19:58 [PATCH v3 0/7] Move initializing SEV/SNP functionality to KVM Ashish Kalra
2025-01-03 19:59 ` [PATCH v3 1/7] crypto: ccp: Move dev_info/err messages for SEV/SNP initialization Ashish Kalra
2025-01-06 17:17 ` Dionna Amalie Glaze
2025-01-06 23:08 ` Kalra, Ashish
2025-01-07 14:29 ` Tom Lendacky
2025-01-03 20:00 ` [PATCH v3 2/7] crypto: ccp: Fix implicit SEV/SNP init and shutdown in ioctls Ashish Kalra
2025-01-06 18:01 ` Dionna Amalie Glaze
2025-01-06 23:48 ` Kalra, Ashish
2025-01-07 19:08 ` Kalra, Ashish
2025-01-07 3:29 ` Alexey Kardashevskiy
2025-01-07 18:53 ` Kalra, Ashish [this message]
2025-01-03 20:00 ` [PATCH v3 3/7] crypto: ccp: Reset TMR size at SNP Shutdown Ashish Kalra
2025-01-03 20:00 ` [PATCH v3 4/7] crypto: ccp: Register SNP panic notifier only if SNP is enabled Ashish Kalra
2025-01-06 19:08 ` Dionna Amalie Glaze
2025-01-03 20:01 ` [PATCH v3 5/7] crypto: ccp: Add new SEV/SNP platform shutdown API Ashish Kalra
2025-01-06 19:14 ` Dionna Amalie Glaze
2025-01-03 20:01 ` [PATCH v3 6/7] KVM: SVM: Add support to initialize SEV/SNP functionality in KVM Ashish Kalra
2025-01-07 16:42 ` Tom Lendacky
2025-01-07 18:34 ` Kalra, Ashish
2025-01-07 20:56 ` Kalra, Ashish
2025-01-08 17:22 ` Tom Lendacky
2025-01-09 0:27 ` Kalra, Ashish
2025-01-10 22:41 ` Kalra, Ashish
2025-01-11 0:40 ` Sean Christopherson
2025-01-11 0:41 ` Dionna Amalie Glaze
2025-01-11 0:49 ` Sean Christopherson
2025-01-13 15:03 ` Kalra, Ashish
2025-01-14 21:14 ` Kalra, Ashish
2025-01-14 22:31 ` Sean Christopherson
2025-01-15 22:26 ` Kalra, Ashish
2025-01-03 20:02 ` [PATCH v3 7/7] crypto: ccp: Move SEV/SNP Platform initialization to KVM Ashish Kalra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=5391cdaa-ac29-4964-b2d6-59d2ba38d35d@amd.com \
--to=ashish.kalra@amd.com \
--cc=aik@amd.com \
--cc=bp@alien8.de \
--cc=dave.hansen@linux.intel.com \
--cc=davem@davemloft.net \
--cc=dionnaglaze@google.com \
--cc=herbert@gondor.apana.org.au \
--cc=hpa@zytor.com \
--cc=john.allen@amd.com \
--cc=kvm@vger.kernel.org \
--cc=linux-coco@lists.linux.dev \
--cc=linux-crypto@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=michael.roth@amd.com \
--cc=mingo@redhat.com \
--cc=pbonzini@redhat.com \
--cc=seanjc@google.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).