KVM: SVM: fix random segfaults with NPT enabled

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This patch introduces a guest TLB flush on every NPF exit in KVM. This fixes
random segfaults and #UD exceptions in the guest seen under some workloads
(e.g. long running compile workloads or tbench). A kernbench run with and
without that fix showed that it has a slowdown lower than 0.5%

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@qumranet.com>

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Joerg Roedel 2008-08-27 14:18:43 +02:00 • committed by Avi Kivity

parent adee14b2e1

commit 44874f8491

1 changed files with 8 additions and 0 deletions

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arch/x86/kvm/svm.c

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