Re: [PATCH v4 15/18] x86/sgx: Prepare for multiple LRUs

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On Wed, 13 Sep 2023 10:42:52 -0500, Jarkko Sakkinen <jarkko@xxxxxxxxxx> wrote:

On Wed Sep 13, 2023 at 7:06 AM EEST, Haitao Huang wrote:
Add sgx_can_reclaim() wrapper and encapsulate direct references to the
global LRU list in the reclaimer functions so that they can be called with
an LRU list per EPC cgroup.

Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Kristen Carlson Accardi <kristen@xxxxxxxxxxxxxxx>
Signed-off-by: Haitao Huang <haitao.huang@xxxxxxxxxxxxxxx>
Cc: Sean Christopherson <seanjc@xxxxxxxxxx>
---
V4:
- Re-organized this patch to include all changes related to
encapsulation of the global LRU
- Moved this patch to precede the EPC cgroup patch
---
 arch/x86/kernel/cpu/sgx/main.c | 41 +++++++++++++++++++++++-----------
 1 file changed, 28 insertions(+), 13 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index ce316bd5e5bb..3d396fe5ec09 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -34,6 +34,16 @@ static DEFINE_XARRAY(sgx_epc_address_space);
  */
 static struct sgx_epc_lru_lists sgx_global_lru;

+static inline struct sgx_epc_lru_lists *sgx_lru_lists(struct sgx_epc_page *epc_page)
+{
+	return &sgx_global_lru;
+}

I'd simply export sgx_global_lru.

The purpose of this patch to to hide sgx_global_lru so later we can have LRU per cgroup. I'll update the commit message to make it clear this is not just for sgx_can_reclaim

+static inline bool sgx_can_reclaim(void)
+{
+	return !list_empty(&sgx_global_lru.reclaimable);
+}


Accessors for the object should be named so that this fact is reflected,
e.g. sgx_global_lru_can_reclaim() in this case.

I would just open code this to the call sites though.

ditto

Thanks
Haitao



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