lkml.org 
[lkml]   [2018]   [Sep]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 5/13] KVM/MMU: Flush tlb directly in the kvm_zap_gfn_range()
Date
Originally, flush tlb is done by slot_handle_level_range(). This patch
is to flush tlb directly in the kvm_zap_gfn_range() when range
flush is available.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
---
arch/x86/kvm/mmu.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index cadb6a0b5247..9ae5887c8d1c 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -5583,6 +5583,7 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
{
struct kvm_memslots *slots;
struct kvm_memory_slot *memslot;
+ bool flush = false;
int i;

spin_lock(&kvm->mmu_lock);
@@ -5590,18 +5591,26 @@ void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
slots = __kvm_memslots(kvm, i);
kvm_for_each_memslot(memslot, slots) {
gfn_t start, end;
+ bool flush_tlb = true;

start = max(gfn_start, memslot->base_gfn);
end = min(gfn_end, memslot->base_gfn + memslot->npages);
if (start >= end)
continue;

- slot_handle_level_range(kvm, memslot, kvm_zap_rmapp,
- PT_PAGE_TABLE_LEVEL, PT_MAX_HUGEPAGE_LEVEL,
- start, end - 1, true);
+ if (kvm_available_flush_tlb_with_range())
+ flush_tlb = false;
+
+ flush = slot_handle_level_range(kvm, memslot,
+ kvm_zap_rmapp, PT_PAGE_TABLE_LEVEL,
+ PT_MAX_HUGEPAGE_LEVEL, start,
+ end - 1, flush_tlb);
}
}

+ if (flush && kvm_available_flush_tlb_with_range())
+ kvm_flush_remote_tlbs_with_address(kvm, gfn_start, gfn_end);
+
spin_unlock(&kvm->mmu_lock);
}

--
2.14.4
\
 
 \ /
  Last update: 2018-09-10 10:39    [W:0.121 / U:0.560 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site