[Xen-devel] [PATCH v2] x86: enable RCU based table free

[Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>]

On x86 software page-table walkers depend on the fact that remote TLB flush
does an IPI: walk is performed lockless but with interrupts disabled and in
case the pagetable is freed the freeing CPU will get blocked as remote TLB
flush is required. On other architecture which don't require an IPI to do
remote TLB flush we have an RCU-based mechanism (see
include/asm-generic/tlb.h for more details).

In virtualized environments we may want to override .flush_tlb_others hook
in pv_mmu_ops and use a hypercall asking the hypervisor to do remote TLB
flush for us. This breaks the assumption about IPI. Xen PV does this for
years and the upcoming remote TLB flush for Hyper-V will do it too. This
is not safe, software pagetable walkers may step on an already freed page.

Solve the issue by enabling RCU-based table free mechanism. Testing with
kernbench and mmap/munmap microbenchmars didn't show any notable
performance impact.

Suggested-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
Acked-by: Juergen Gross <jgross@xxxxxxxx>
---
Changes since v1:
- Enable HAVE_RCU_TABLE_FREE unconditionally to avoid different code pathes
  for no reason [Linus Torvalds]
---
 arch/x86/Kconfig           | 1 +
 arch/x86/include/asm/tlb.h | 5 +++++
 arch/x86/mm/pgtable.c      | 8 ++++----
 3 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 323cb065be5e..b0bfc27d05a2 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -167,6 +167,7 @@ config X86
        select HAVE_HARDLOCKUP_DETECTOR_PERF    if PERF_EVENTS && 
HAVE_PERF_EVENTS_NMI
        select HAVE_PERF_REGS
        select HAVE_PERF_USER_STACK_DUMP
+       select HAVE_RCU_TABLE_FREE
        select HAVE_REGS_AND_STACK_ACCESS_API
        select HAVE_RELIABLE_STACKTRACE         if X86_64 && FRAME_POINTER && 
STACK_VALIDATION
        select HAVE_STACK_VALIDATION            if X86_64
diff --git a/arch/x86/include/asm/tlb.h b/arch/x86/include/asm/tlb.h
index c7797307fc2b..d43a7fcafee9 100644
--- a/arch/x86/include/asm/tlb.h
+++ b/arch/x86/include/asm/tlb.h
@@ -15,4 +15,9 @@
 
 #include <asm-generic/tlb.h>
 
+static inline void __tlb_remove_table(void *table)
+{
+       free_page_and_swap_cache(table);
+}
+
 #endif /* _ASM_X86_TLB_H */
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 508a708eb9a6..218834a3e9ad 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -56,7 +56,7 @@ void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte)
 {
        pgtable_page_dtor(pte);
        paravirt_release_pte(page_to_pfn(pte));
-       tlb_remove_page(tlb, pte);
+       tlb_remove_table(tlb, pte);
 }
 
 #if CONFIG_PGTABLE_LEVELS > 2
@@ -72,21 +72,21 @@ void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
        tlb->need_flush_all = 1;
 #endif
        pgtable_pmd_page_dtor(page);
-       tlb_remove_page(tlb, page);
+       tlb_remove_table(tlb, page);
 }
 
 #if CONFIG_PGTABLE_LEVELS > 3
 void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
 {
        paravirt_release_pud(__pa(pud) >> PAGE_SHIFT);
-       tlb_remove_page(tlb, virt_to_page(pud));
+       tlb_remove_table(tlb, virt_to_page(pud));
 }
 
 #if CONFIG_PGTABLE_LEVELS > 4
 void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d)
 {
        paravirt_release_p4d(__pa(p4d) >> PAGE_SHIFT);
-       tlb_remove_page(tlb, virt_to_page(p4d));
+       tlb_remove_table(tlb, virt_to_page(p4d));
 }
 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
-- 
2.13.5


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