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crypto: ccp - Refactor out sev_fw_alloc()

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Create 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@google.com>
Reviewed-by: Marc Orr <marcorr@google.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Brijesh Singh <brijesh.singh@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Marc Orr <marcorr@google.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Rientjes <rientjes@google.com>
Cc: John Allen <john.allen@amd.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Peter Gonda 2021-12-07 15:33:04 -08:00 committed by Herbert Xu
parent e423b9d75e
commit cc17982d58
1 changed files with 13 additions and 7 deletions
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20
drivers/crypto/ccp/sev-dev.c
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@ -141,6 +141,17 @@ static int sev_cmd_buffer_len(int cmd)
return 0;
}
static void *sev_fw_alloc(unsigned long len)
{
struct page *page;
page = alloc_pages(GFP_KERNEL, get_order(len));
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;
@ -1078,7 +1089,6 @@ 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, rc;
if (!sev)
@ -1094,14 +1104,10 @@ 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);