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| author | Ben Gardon <bgardon@google.com> | 2021-02-02 10:57:20 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-02-04 05:27:41 -0500 |
| commit | 1af4a96025b33587ca953c7ef12a1b20c6e70412 (patch) | |
| tree | 4807a0d90ad215b5454cc7883247517653362455 /tools/perf/scripts/python/flamegraph.py | |
| parent | KVM: x86/mmu: Ensure forward progress when yielding in TDP MMU iter (diff) | |
| download | linux-1af4a96025b33587ca953c7ef12a1b20c6e70412.tar.gz linux-1af4a96025b33587ca953c7ef12a1b20c6e70412.zip | |
KVM: x86/mmu: Yield in TDU MMU iter even if no SPTES changed
Given certain conditions, some TDP MMU functions may not yield
reliably / frequently enough. For example, if a paging structure was
very large but had few, if any writable entries, wrprot_gfn_range
could traverse many entries before finding a writable entry and yielding
because the check for yielding only happens after an SPTE is modified.
Fix this issue by moving the yield to the beginning of the loop.
Fixes: a6a0b05da9f3 ("kvm: x86/mmu: Support dirty logging for the TDP MMU")
Reviewed-by: Peter Feiner <pfeiner@google.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210202185734.1680553-15-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python/flamegraph.py')
0 files changed, 0 insertions, 0 deletions