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ccp: Make snp_reclaim_pages and __sev_do_cmd_locked public

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The snp_reclaim_pages() helper reclaims pages in the FW state. SEV-TIO
and the TMPM driver (a hardware engine which smashes IOMMU PDEs among
other things) will use to reclaim memory when cleaning up.

Share and export snp_reclaim_pages().

Most of the SEV-TIO code uses sev_do_cmd() which locks the sev_cmd_mutex
and already exported. But the SNP init code (which also sets up SEV-TIO)
executes under the sev_cmd_mutex lock so the SEV-TIO code has to use
the __sev_do_cmd_locked() helper. This one though does not need to be
exported/shared globally as SEV-TIO is a part of the CCP driver still.

Share __sev_do_cmd_locked() via the CCP internal header.

Signed-off-by: Alexey Kardashevskiy <aik@amd.com>
Link: https://patch.msgid.link/20251202024449.542361-2-aik@amd.com
Acked-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Alexey Kardashevskiy
2025-12-02 13:44:46 +11:00
committed by Dan Williams
parent f7ae6d4ec6
commit 8a5dd102e4
3 changed files with 11 additions and 8 deletions
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11
drivers/crypto/ccp/sev-dev.c
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@@ -387,13 +387,7 @@ static int sev_write_init_ex_file_if_required(int cmd_id)
return sev_write_init_ex_file();
}
/*
* snp_reclaim_pages() needs __sev_do_cmd_locked(), and __sev_do_cmd_locked()
* needs snp_reclaim_pages(), so a forward declaration is needed.
*/
static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret);
static int snp_reclaim_pages(unsigned long paddr, unsigned int npages, bool locked)
int snp_reclaim_pages(unsigned long paddr, unsigned int npages, bool locked)
{
int ret, err, i;
@@ -427,6 +421,7 @@ cleanup:
snp_leak_pages(__phys_to_pfn(paddr), npages - i);
return ret;
}
EXPORT_SYMBOL_GPL(snp_reclaim_pages);
static int rmp_mark_pages_firmware(unsigned long paddr, unsigned int npages, bool locked)
{
@@ -857,7 +852,7 @@ static int snp_reclaim_cmd_buf(int cmd, void *cmd_buf)
return 0;
}
static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
{
struct cmd_buf_desc desc_list[CMD_BUF_DESC_MAX] = {0};
struct psp_device *psp = psp_master;