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x86/sgx: Do not update sgx_nr_free_pages in sgx_setup_epc_section() 

The commit in Fixes: changed the SGX EPC page sanitization to end up in
sgx_free_epc_page() which puts clean and sanitized pages on the free
list.

This was done for the reason that it is best to keep the logic to assign
available-for-use EPC pages to the correct NUMA lists in a single
location.

sgx_nr_free_pages is also incremented by sgx_free_epc_pages() but those
pages which are being added there per EPC section do not belong to the
free list yet because they haven't been sanitized yet - they land on the
dirty list first and the sanitization happens later when ksgxd starts
massaging them.

So remove that addition there and have sgx_free_epc_page() do that
solely.

 [ bp: Sanitize commit message too. ]

Fixes: 51ab30eb2a ("x86/sgx: Replace section->init_laundry_list with sgx_dirty_page_list")
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210408092924.7032-1-jarkko@kernel.org
This commit is contained in:
Jarkko Sakkinen 2021-04-08 12:29:24 +03:00 committed by Borislav Petkov
parent b3754e5d3d
commit ae40aaf6bd
1 changed files with 0 additions and 1 deletions
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1
arch/x86/kernel/cpu/sgx/main.c
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@ -656,7 +656,6 @@ static bool __init sgx_setup_epc_section(u64 phys_addr, u64 size,
list_add_tail(&section->pages[i].list, &sgx_dirty_page_list);
}
sgx_nr_free_pages += nr_pages;
return true;
}