On 10/28/21 12:57 PM, Peter Gonda wrote:
Creates a helper function sev_fw_alloc() which can be used to allocate
aligned memory regions for use by the PSP firmware. Currently only used
for the SEV-ES TMR region but will be used for the SEV_INIT_EX NV memory
region.
Signed-off-by: Peter Gonda <pgonda@xxxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: Brijesh Singh <brijesh.singh@xxxxxxx>
Cc: Marc Orr <marcorr@xxxxxxxxxx>
Cc: Joerg Roedel <jroedel@xxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: John Allen <john.allen@xxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx> (
Cc: linux-crypto@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
drivers/crypto/ccp/sev-dev.c | 24 +++++++++++++++++-------
1 file changed, 17 insertions(+), 7 deletions(-)
diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index e4bc833949a0..b568ae734857 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -141,6 +141,21 @@ static int sev_cmd_buffer_len(int cmd)
return 0;
}
+static void *sev_fw_alloc(unsigned long len)
+{
+ const int order = get_order(len);
This should be an unsigned int to match the function definition, but is
probably not needed given the comment below.
+ struct page *page;
+
+ if (order > MAX_ORDER-1)
+ return NULL;
I believe alloc_pages() already does this check (and provides a warning
unless requested not to), so this check isn't needed.
+
+ page = alloc_pages(GFP_KERNEL, order);
Without the above check, you can just replace the 'order' variable with
'get_order(len)'.
Thanks,
Tom
+ if (!page)
+ return NULL;
+
+ return page_address(page);
+}
+
static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
{
struct psp_device *psp = psp_master;
@@ -1076,7 +1091,6 @@ EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);
void sev_pci_init(void)
{
struct sev_device *sev = psp_master->sev_data;
- struct page *tmr_page;
int error = 0, rc;
if (!sev)
@@ -1092,14 +1106,10 @@ void sev_pci_init(void)
sev_get_api_version();
/* Obtain the TMR memory area for SEV-ES use */
- tmr_page = alloc_pages(GFP_KERNEL, get_order(SEV_ES_TMR_SIZE));
- if (tmr_page) {
- sev_es_tmr = page_address(tmr_page);
- } else {
- sev_es_tmr = NULL;
+ sev_es_tmr = sev_fw_alloc(SEV_ES_TMR_SIZE);
+ if (!sev_es_tmr)
dev_warn(sev->dev,
"SEV: TMR allocation failed, SEV-ES support unavailable\n");
- }
/* Initialize the platform */
rc = sev_platform_init(&error);
