The sev_get_attestation_report is called by qemu-kvm to get sev
attestation report. However, getting the sev attestation report
is a general function, the need for host program to get the sev
attestation report by interacting with /dev/sev device exists.
Considering this need, it is more reasonable to move the main
implementation of sev_get_attestation_report into sev_do_get_report
defined in the ccp driver. Any host program getting the guest
firmware handle can directly interact with the sev device based
on sev_do_get_report to get the sev attestation report.
In addition, after moving the general code of sev_get_attestation_report
to the ccp, move the check for sev fd in __sev_issue_cmd to the
sev_get_attestation_report function is necessary.
Signed-off-by: Shirong Hao <shirong@xxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/svm/sev.c | 49 ++++---------------------------
drivers/crypto/ccp/sev-dev.c | 56 ++++++++++++++++++++++++++++++++++++
include/linux/psp-sev.h | 7 +++++
3 files changed, 69 insertions(+), 43 deletions(-)
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c
index 7656a2c5662a..016acc96c5dc 100644
--- a/arch/x86/kvm/svm/sev.c
+++ b/arch/x86/kvm/svm/sev.c
@@ -1066,10 +1066,8 @@ static int sev_get_attestation_report(struct kvm *kvm, struct kvm_sev_cmd *argp)
{
void __user *report = (void __user *)(uintptr_t)argp->data;
struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info;
- struct sev_data_attestation_report data;
struct kvm_sev_attestation_report params;
- void __user *p;
- void *blob = NULL;
+ struct fd f;
int ret;
if (!sev_guest(kvm))
@@ -1078,48 +1076,13 @@ static int sev_get_attestation_report(struct kvm *kvm, struct kvm_sev_cmd *argp)
if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params)))
return -EFAULT;
- memset(&data, 0, sizeof(data));
-
- /* User wants to query the blob length */
- if (!params.len)
- goto cmd;
-
- p = (void __user *)(uintptr_t)params.uaddr;
- if (p) {
- if (params.len > SEV_FW_BLOB_MAX_SIZE)
- return -EINVAL;
-
- blob = kmalloc(params.len, GFP_KERNEL_ACCOUNT);
- if (!blob)
- return -ENOMEM;
-
- data.address = __psp_pa(blob);
- data.len = params.len;
- memcpy(data.mnonce, params.mnonce, sizeof(params.mnonce));
- }
-cmd:
- data.handle = sev->handle;
- ret = sev_issue_cmd(kvm, SEV_CMD_ATTESTATION_REPORT, &data, &argp->error);
- /*
- * If we query the session length, FW responded with expected data.
- */
- if (!params.len)
- goto done;
-
- if (ret)
- goto e_free_blob;
+ f = fdget(sev->fd);
+ if (!f.file)
+ return -EBADF;
- if (blob) {
- if (copy_to_user(p, blob, params.len))
- ret = -EFAULT;
- }
+ ret = sev_do_get_report(report, ¶ms, f.file, sev->handle, &argp->error);
-done:
- params.len = data.len;
- if (copy_to_user(report, ¶ms, sizeof(params)))
- ret = -EFAULT;
-e_free_blob:
- kfree(blob);
+ fdput(f);
return ret;
}
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index e09925d86bf3..2f6b81742d28 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -22,6 +22,7 @@
#include <linux/firmware.h>
#include <linux/gfp.h>
#include <linux/cpufeature.h>
+#include <linux/kvm.h>
#include <asm/smp.h>
@@ -384,6 +385,61 @@ static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
return ret;
}
+int sev_do_get_report(void __user *report, struct kvm_sev_attestation_report *input,
+ struct file *filep, u32 handle, u32 *error)
+{
+ struct sev_data_attestation_report data;
+ void __user *p;
+ void *blob = NULL;
+ int ret;
+
+ memset(&data, 0, sizeof(data));
+
+ /* User wants to query the blob length */
+ if (!input->len)
+ goto cmd;
+
+ p = (void __user *)(uintptr_t)input->uaddr;
+ if (p) {
+ if (input->len > SEV_FW_BLOB_MAX_SIZE)
+ return -EINVAL;
+
+ blob = kmalloc(input->len, GFP_KERNEL_ACCOUNT);
+ if (!blob)
+ return -ENOMEM;
+
+ data.address = __psp_pa(blob);
+ data.len = input->len;
+ memcpy(data.mnonce, input->mnonce, sizeof(input->mnonce));
+ }
+cmd:
+ data.handle = handle;
+ ret = sev_issue_cmd_external_user(filep, SEV_CMD_ATTESTATION_REPORT, &data, error);
+
+ /*
+ * If we query the session length, FW responded with expected data.
+ */
+ if (!input->len)
+ goto done;
+
+ if (ret)
+ goto e_free_blob;
+
+ if (blob) {
+ if (copy_to_user(p, blob, input->len))
+ ret = -EFAULT;
+ }
+
+done:
+ input->len = data.len;
+ if (copy_to_user(report, input, sizeof(*input)))
+ ret = -EFAULT;
+e_free_blob:
+ kfree(blob);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sev_do_get_report);
+
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;
diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
index d48a7192e881..0cbf39a7d116 100644
--- a/include/linux/psp-sev.h
+++ b/include/linux/psp-sev.h
@@ -541,6 +541,9 @@ int sev_platform_init(int *error);
*/
int sev_platform_status(struct sev_user_data_status *status, int *error);
+int sev_do_get_report(void __user *report, struct kvm_sev_attestation_report *input,
+ struct file *filep, u32 handle, u32 *error);
+
/**
* sev_issue_cmd_external_user - issue SEV command by other driver with a file
* handle.
@@ -649,6 +652,10 @@ sev_issue_cmd_external_user(struct file *filep, unsigned int id, void *data, int
static inline void *psp_copy_user_blob(u64 __user uaddr, u32 len) { return ERR_PTR(-EINVAL); }
+static inline int
+sev_do_get_report(void __user *report, struct kvm_sev_attestation_report *input,
+ struct file *filep, u32 handle, u32 *error) { return -ENODEV; }
+
#endif /* CONFIG_CRYPTO_DEV_SP_PSP */
#endif /* __PSP_SEV_H__ */
--
2.27.0
