Re: [PATCH V2 03/14] x86/set_memory: Add x86_set_memory_enc static call support
From: Dave Hansen <hidden>
Date: 2021-08-04 19:27:28
Also in:
linux-arch, linux-hyperv, linux-iommu, lkml, netdev, xen-devel
On 8/4/21 11:44 AM, Tianyu Lan wrote:
quoted hunk ↗ jump to hunk
+static int default_set_memory_enc(unsigned long addr, int numpages, bool enc); +DEFINE_STATIC_CALL(x86_set_memory_enc, default_set_memory_enc); + #define CPA_FLUSHTLB 1 #define CPA_ARRAY 2 #define CPA_PAGES_ARRAY 4@@ -1981,6 +1985,11 @@ int set_memory_global(unsigned long addr, int numpages) } static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc) +{ + return static_call(x86_set_memory_enc)(addr, numpages, enc); +} + +static int default_set_memory_enc(unsigned long addr, int numpages, bool enc) { struct cpa_data cpa; int ret;
It doesn't make a lot of difference to add this infrastructure and then ignore it for the existing in-tree user:
static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
{
struct cpa_data cpa;
int ret;
/* Nothing to do if memory encryption is not active */
if (!mem_encrypt_active())
return 0;Shouldn't the default be to just "return 0"? Then on mem_encrypt_active() systems, do the bulk of what is in __set_memory_enc_dec() today.