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x86/sgx: Handle VA page allocation failure for EAUG on PF.

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VM_FAULT_NOPAGE is expected behaviour for -EBUSY failure path, when
augmenting a page, as this means that the reclaimer thread has been
triggered, and the intention is just to round-trip in ring-3, and
retry with a new page fault.

Fixes: 5a90d2c3f5 ("x86/sgx: Support adding of pages to an initialized enclave")
Signed-off-by: Haitao Huang <haitao.huang@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Vijay Dhanraj <vijay.dhanraj@intel.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20220906000221.34286-3-jarkko@kernel.org
This commit is contained in:
Haitao Huang 2022-09-06 03:02:21 +03:00 committed by Dave Hansen
parent 133e049a3f
commit 81fa6fd13b
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kernel/cpu/sgx/encl.c
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@ -344,8 +344,11 @@ static vm_fault_t sgx_encl_eaug_page(struct vm_area_struct *vma,
}
va_page = sgx_encl_grow(encl, false);
if (IS_ERR(va_page))
if (IS_ERR(va_page)) {
if (PTR_ERR(va_page) == -EBUSY)
vmret = VM_FAULT_NOPAGE;
goto err_out_epc;
}
if (va_page)
list_add(&va_page->list, &encl->va_pages);