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From: Andy Lutomirski <luto@kernel.org>
To: x86@kernel.org
Cc: linux-kernel@vger.kernel.org, Borislav Petkov <bp@alien8.de>,
	Andy Lutomirski <luto@kernel.org>, Rik van Riel <riel@redhat.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Nadav Amit <namit@vmware.com>, Michal Hocko <mhocko@suse.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Juergen Gross <jgross@suse.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: [PATCH v3 4/4] x86/mm: Fix flush_tlb_page() on Xen
Date: Sat, 22 Apr 2017 00:01:22 -0700
Message-ID: <10ed0e4dfea64daef10b87fb85df1746999b4dba.1492844372.git.luto@kernel.org> (raw)
In-Reply-To: <cover.1492844372.git.luto@kernel.org>
In-Reply-To: <cover.1492844372.git.luto@kernel.org>

flush_tlb_page() passes a bogus range to flush_tlb_others() and
expects the latter to fix it up.  native_flush_tlb_others() has the
fixup but Xen's version doesn't.  Move the fixup to
flush_tlb_others().

AFAICS the only real effect is that, without this fix, Xen would
flush everything instead of just the one page on remote vCPUs in
when flush_tlb_page() was called.

Cc: Rik van Riel <riel@redhat.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Nadav Amit <namit@vmware.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Juergen Gross <jgross@suse.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Fixes: e7b52ffd45a6 ("x86/flush_tlb: try flush_tlb_single one by one in flush_tlb_range")
Signed-off-by: Andy Lutomirski <luto@kernel.org>
---
 arch/x86/mm/tlb.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 9db9260a5e9f..6e7bedf69af7 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -263,8 +263,6 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
 {
 	struct flush_tlb_info info;
 
-	if (end == 0)
-		end = start + PAGE_SIZE;
 	info.flush_mm = mm;
 	info.flush_start = start;
 	info.flush_end = end;
@@ -378,7 +376,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long start)
 	}
 
 	if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
-		flush_tlb_others(mm_cpumask(mm), mm, start, 0UL);
+		flush_tlb_others(mm_cpumask(mm), mm, start, start + PAGE_SIZE);
 
 	preempt_enable();
 }
-- 
2.9.3

  parent reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-22  7:01 [PATCH v3 0/4] x86/mm: Straightforward TLB flush fixes/cleanups Andy Lutomirski
2017-04-22  7:01 ` [PATCH v3 1/4] x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly() Andy Lutomirski
2017-04-26  8:26   ` [tip:x86/mm] " tip-bot for Andy Lutomirski
2017-04-26 23:56   ` [PATCH v3 1/4] " Nadav Amit
2017-04-27  0:02     ` Nadav Amit
2017-04-27 16:08       ` Andy Lutomirski
2017-04-27 22:15         ` Stas Sergeev
2017-04-27 22:17         ` Stas Sergeev
2017-04-22  7:01 ` [PATCH v3 2/4] x86/mm: Remove flush_tlb() and flush_tlb_current_task() Andy Lutomirski
2017-04-26  8:27   ` [tip:x86/mm] " tip-bot for Andy Lutomirski
2017-04-22  7:01 ` [PATCH v3 3/4] x86/mm: Make flush_tlb_mm_range() more predictable Andy Lutomirski
2017-04-26  8:27   ` [tip:x86/mm] " tip-bot for Andy Lutomirski
2017-04-22  7:01 ` Andy Lutomirski [this message]
2017-04-26  8:28   ` [tip:x86/mm] x86/mm: Fix flush_tlb_page() on Xen tip-bot for Andy Lutomirski

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