AcoSail/kernel_optimize_test
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x86/mm/cpa: Simplify the code after making cpa->vaddr invariant

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Since cpa->vaddr is invariant, this means we can remove all
workarounds that deal with it changing.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tom.StDenis@amd.com
Cc: dave.hansen@intel.com
Link: http://lkml.kernel.org/r/20181203171043.366619025@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2018-12-03 18:03:48 +01:00 committed by Ingo Molnar
parent 98bfc9b038
commit 5fe26b7a8f
2 changed files with 6 additions and 14 deletions
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7
arch/x86/mm/pageattr-test.c
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@ -124,7 +124,6 @@ static int pageattr_test(void)
unsigned int level;
int i, k;
int err;
unsigned long test_addr;
if (print)
printk(KERN_INFO "CPA self-test:\n");
@ -181,8 +180,7 @@ static int pageattr_test(void)
switch (i % 3) {
case 0:
test_addr = addr[i];
err = change_page_attr_set(&test_addr, len[i], PAGE_CPA_TEST, 0);
err = change_page_attr_set(&addr[i], len[i], PAGE_CPA_TEST, 0);
break;
case 1:
@ -226,8 +224,7 @@ static int pageattr_test(void)
failed++;
continue;
}
test_addr = addr[i];
err = change_page_attr_clear(&test_addr, len[i], PAGE_CPA_TEST, 0);
err = change_page_attr_clear(&addr[i], len[i], PAGE_CPA_TEST, 0);
if (err < 0) {
printk(KERN_ERR "CPA reverting failed: %d\n", err);
failed++;

13
arch/x86/mm/pageattr.c
View File

@ -1908,15 +1908,13 @@ EXPORT_SYMBOL_GPL(set_memory_array_wt);
int _set_memory_wc(unsigned long addr, int numpages)
{
int ret;
unsigned long addr_copy = addr;
ret = change_page_attr_set(&addr, numpages,
cachemode2pgprot(_PAGE_CACHE_MODE_UC_MINUS),
0);
if (!ret) {
ret = change_page_attr_set_clr(&addr_copy, numpages,
cachemode2pgprot(
_PAGE_CACHE_MODE_WC),
ret = change_page_attr_set_clr(&addr, numpages,
cachemode2pgprot(_PAGE_CACHE_MODE_WC),
__pgprot(_PAGE_CACHE_MASK),
0, 0, NULL);
}
@ -2064,7 +2062,6 @@ int set_memory_global(unsigned long addr, int numpages)
static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
{
struct cpa_data cpa;
unsigned long start;
int ret;
/* Nothing to do if memory encryption is not active */
@ -2075,8 +2072,6 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
if (WARN_ONCE(addr & ~PAGE_MASK, "misaligned address: %#lx\n", addr))
addr &= PAGE_MASK;
start = addr;
memset(&cpa, 0, sizeof(cpa));
cpa.vaddr = &addr;
cpa.numpages = numpages;
@ -2091,7 +2086,7 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
/*
* Before changing the encryption attribute, we need to flush caches.
*/
cpa_flush_range(start, numpages, 1);
cpa_flush_range(addr, numpages, 1);
ret = __change_page_attr_set_clr(&cpa, 1);
@ -2102,7 +2097,7 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
* in case TLB flushing gets optimized in the cpa_flush_range()
* path use the same logic as above.
*/
cpa_flush_range(start, numpages, 0);
cpa_flush_range(addr, numpages, 0);
return ret;
}