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| author |   Sean Christopherson <sean.j.christopherson@intel.com> | 2020-01-17 11:30:49 -0800 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2020-01-27 19:59:46 +0100 |
| commit | c9aef3b85f425d1f6635382ec210ee5a7ef55d7d (patch) | |
| tree | 0c9d69660d52db94d2f1bd95b41de007ee454e6b /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | Revert "KVM: x86: Add a WARN on TIF_NEED_FPU_LOAD in kvm_load_guest_fpu()" (diff) | |
| download | linux-dev-c9aef3b85f425d1f6635382ec210ee5a7ef55d7d.tar.xz linux-dev-c9aef3b85f425d1f6635382ec210ee5a7ef55d7d.zip | |
KVM: x86: Handle TIF_NEED_FPU_LOAD in kvm_{load,put}_guest_fpu()
Handle TIF_NEED_FPU_LOAD similar to how fpu__copy() handles the flag
when duplicating FPU state to a new task struct. TIF_NEED_FPU_LOAD can
be set any time control is transferred out of KVM, be it voluntarily,
e.g. if I/O is triggered during a KVM call to get_user_pages, or
involuntarily, e.g. if softirq runs after an IRQ occurs. Therefore,
KVM must account for TIF_NEED_FPU_LOAD whenever it is (potentially)
accessing CPU FPU state.
Fixes: 5f409e20b7945 ("x86/fpu: Defer FPU state load until return to userspace")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions