From: Peter Zijlstra <peterz@infradead.org>
To: dave.hansen@intel.com, luto@kernel.org, peterz@infradead.org
Cc: x86@kernel.org, Tom.StDenis@amd.com, linux-kernel@vger.kernel.org
Subject: [PATCH 01/10] x86/mm/cpa: Fix cpa_flush_array() TLB invalidation
Date: Mon, 03 Dec 2018 18:03:44 +0100 [thread overview]
Message-ID: <20181203171043.089868285@infradead.org> (raw)
In-Reply-To: 20181203170343.054618965@infradead.org
In commit:
a7295fd53c39 ("x86/mm/cpa: Use flush_tlb_kernel_range()")
I misread the cpa array code and incorrectly used
tlb_flush_kernel_range(), resulting in missing TLB flushes and
consequent failures.
Instead do a full invalidate in this case -- for now.
Fixes: a7295fd53c39 ("x86/mm/cpa: Use flush_tlb_kernel_range()")
Reported-by: "StDenis, Tom" <Tom.StDenis@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/mm/pageattr.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index bac35001d896..61bc7d1800d7 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -285,20 +285,16 @@ static void cpa_flush_all(unsigned long cache)
on_each_cpu(__cpa_flush_all, (void *) cache, 1);
}
-static bool __cpa_flush_range(unsigned long start, int numpages, int cache)
+static bool __inv_flush_all(int cache)
{
BUG_ON(irqs_disabled() && !early_boot_irqs_disabled);
- WARN_ON(PAGE_ALIGN(start) != start);
-
if (cache && !static_cpu_has(X86_FEATURE_CLFLUSH)) {
cpa_flush_all(cache);
return true;
}
- flush_tlb_kernel_range(start, start + PAGE_SIZE * numpages);
-
- return !cache;
+ return false;
}
static void cpa_flush_range(unsigned long start, int numpages, int cache)
@@ -306,7 +302,14 @@ static void cpa_flush_range(unsigned long start, int numpages, int cache)
unsigned int i, level;
unsigned long addr;
- if (__cpa_flush_range(start, numpages, cache))
+ WARN_ON(PAGE_ALIGN(start) != start);
+
+ if (__inv_flush_all(cache))
+ return;
+
+ flush_tlb_kernel_range(start, start + PAGE_SIZE * numpages);
+
+ if (!cache)
return;
/*
@@ -332,7 +335,12 @@ static void cpa_flush_array(unsigned long baddr, unsigned long *start,
{
unsigned int i, level;
- if (__cpa_flush_range(baddr, numpages, cache))
+ if (__inv_flush_all(cache))
+ return;
+
+ flush_tlb_all();
+
+ if (!cache)
return;
/*
next prev parent reply other threads:[~2018-12-03 17:14 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-03 17:03 [RFC][PATCH 00/10] x86/mm/cpa: Various fixes and improvements Peter Zijlstra
2018-12-03 17:03 ` Peter Zijlstra [this message]
2018-12-17 18:20 ` [tip:x86/mm] x86/mm/cpa: Fix cpa_flush_array() TLB invalidation tip-bot for Peter Zijlstra
2018-12-03 17:03 ` [RFC][PATCH 02/10] x86/mm/cpa: Add ARRAY and PAGES_ARRAY selftests Peter Zijlstra
2018-12-17 18:21 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-12-03 17:03 ` [RFC][PATCH 03/10] x86/mm/cpa: Add __cpa_addr() helper Peter Zijlstra
2018-12-17 18:21 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-12-03 17:03 ` [RFC][PATCH 04/10] x86/mm/cpa: Make cpa_data::vaddr invariant Peter Zijlstra
2018-12-17 18:22 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-12-03 17:03 ` [RFC][PATCH 05/10] x86/mm/cpa: Cleanup Peter Zijlstra
2018-12-17 18:23 ` [tip:x86/mm] x86/mm/cpa: Simplify the code after making cpa->vaddr invariant tip-bot for Peter Zijlstra
2018-12-03 17:03 ` [RFC][PATCH 06/10] x86/mm/cpa: Optimize cpa_flush_array() TLB invalidation Peter Zijlstra
2018-12-17 18:23 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-12-03 17:03 ` [RFC][PATCH 07/10] x86/mm/cpa: Make cpa_data::numpages invariant Peter Zijlstra
2018-12-17 18:24 ` [tip:x86/mm] " tip-bot for Peter Zijlstra
2018-12-03 17:03 ` [RFC][PATCH 08/10] x86/mm/cpa: Fold cpa_flush_range() and cpa_flush_array() Peter Zijlstra
2018-12-17 18:24 ` [tip:x86/mm] x86/mm/cpa: Fold cpa_flush_range() and cpa_flush_array() into a single cpa_flush() function tip-bot for Peter Zijlstra
2018-12-03 17:03 ` [RFC][PATCH 09/10] x86/mm/cpa: Better use clflushopt Peter Zijlstra
2018-12-17 18:25 ` [tip:x86/mm] x86/mm/cpa: Better use CLFLUSHOPT tip-bot for Peter Zijlstra
2018-12-03 17:03 ` [RFC][PATCH 10/10] x86/mm/cpa: Rename @addrinarray Peter Zijlstra
2018-12-17 18:26 ` [tip:x86/mm] x86/mm/cpa: Rename @addrinarray to @numpages tip-bot for Peter Zijlstra
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