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x86/sgx: Rename sgx_encl_ewb_cpumask() as sgx_encl_cpumask()

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sgx_encl_ewb_cpumask() is no longer unique to the reclaimer where it
is used during the EWB ENCLS leaf function when EPC pages are written
out to main memory and sgx_encl_ewb_cpumask() is used to learn which
CPUs might have executed the enclave to ensure that TLBs are cleared.

Upcoming SGX2 enabling will use sgx_encl_ewb_cpumask() during the
EMODPR and EMODT ENCLS leaf functions that make changes to enclave
pages. The function is needed for the same reason it is used now: to
learn which CPUs might have executed the enclave to ensure that TLBs
no longer point to the changed pages.

Rename sgx_encl_ewb_cpumask() to sgx_encl_cpumask() to reflect the
broader usage.

Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lkml.kernel.org/r/d4d08c449450a13d8dd3bb6c2b1af03895586d4f.1652137848.git.reinette.chatre@intel.com
This commit is contained in:
Reinette Chatre 2022-05-10 11:08:43 -07:00 committed by Dave Hansen
parent 7f391752d4
commit bdaa8799f6
3 changed files with 5 additions and 5 deletions
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6
arch/x86/kernel/cpu/sgx/encl.c
View File

@ -715,7 +715,7 @@ int sgx_encl_mm_add(struct sgx_encl *encl, struct mm_struct *mm)
}
/**
* sgx_encl_ewb_cpumask() - Query which CPUs might be accessing the enclave
* sgx_encl_cpumask() - Query which CPUs might be accessing the enclave
* @encl: the enclave
*
* Some SGX functions require that no cached linear-to-physical address
@ -740,7 +740,7 @@ int sgx_encl_mm_add(struct sgx_encl *encl, struct mm_struct *mm)
* The following flow is used to support SGX functions that require that
* no cached linear-to-physical address mappings are present:
* 1) Execute ENCLS[ETRACK] to initiate hardware tracking.
* 2) Use this function (sgx_encl_ewb_cpumask()) to query which CPUs might be
* 2) Use this function (sgx_encl_cpumask()) to query which CPUs might be
* accessing the enclave.
* 3) Send IPI to identified CPUs, kicking them out of the enclave and
* thus flushing all locally cached linear-to-physical address mappings.
@ -757,7 +757,7 @@ int sgx_encl_mm_add(struct sgx_encl *encl, struct mm_struct *mm)
*
* Return: cpumask of CPUs that might be accessing @encl
*/
const cpumask_t *sgx_encl_ewb_cpumask(struct sgx_encl *encl)
const cpumask_t *sgx_encl_cpumask(struct sgx_encl *encl)
{
cpumask_t *cpumask = &encl->cpumask;
struct sgx_encl_mm *encl_mm;

2
arch/x86/kernel/cpu/sgx/encl.h
View File

@ -105,7 +105,7 @@ int sgx_encl_may_map(struct sgx_encl *encl, unsigned long start,
void sgx_encl_release(struct kref *ref);
int sgx_encl_mm_add(struct sgx_encl *encl, struct mm_struct *mm);
const cpumask_t *sgx_encl_ewb_cpumask(struct sgx_encl *encl);
const cpumask_t *sgx_encl_cpumask(struct sgx_encl *encl);
int sgx_encl_get_backing(struct sgx_encl *encl, unsigned long page_index,
struct sgx_backing *backing);
void sgx_encl_put_backing(struct sgx_backing *backing);

2
arch/x86/kernel/cpu/sgx/main.c
View File

@ -251,7 +251,7 @@ static void sgx_encl_ewb(struct sgx_epc_page *epc_page,
* miss cpus that entered the enclave between
* generating the mask and incrementing epoch.
*/
on_each_cpu_mask(sgx_encl_ewb_cpumask(encl),
on_each_cpu_mask(sgx_encl_cpumask(encl),
sgx_ipi_cb, NULL, 1);
ret = __sgx_encl_ewb(epc_page, va_slot, backing);
}