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| author | Andrei Vagin <avagin@gmail.com> | 2021-03-30 21:40:07 -0700 |
|---|---|---|
| committer | Andrei Vagin <avagin@gmail.com> | 2021-04-01 13:28:15 -0700 |
| commit | eb9b8e53a3ef7bb96dcb59a0121fa9ed22f01bfd (patch) | |
| tree | d01a7b7aae854e5b2a89c156d809e1b6aafc4640 /pkg/ring0/lib_amd64.go | |
| parent | 6c10c772e46ffe8d27cffe77aed24f0d334d611c (diff) | |
platform/kvm/x86: restore mxcsr when switching from guest to sentry
Goruntime sets mxcsr once and never changes it.
Reported-by: syzbot+ec55cea6e57ec083b7a6@syzkaller.appspotmail.com
Fixes: #5754
Diffstat (limited to 'pkg/ring0/lib_amd64.go')
| -rw-r--r-- | pkg/ring0/lib_amd64.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/pkg/ring0/lib_amd64.go b/pkg/ring0/lib_amd64.go index 0ec5c3bc5..3e6bb9663 100644 --- a/pkg/ring0/lib_amd64.go +++ b/pkg/ring0/lib_amd64.go @@ -61,6 +61,12 @@ func wrgsbase(addr uintptr) // wrgsmsr writes to the GS_BASE MSR. func wrgsmsr(addr uintptr) +// stmxcsr reads the MXCSR control and status register. +func stmxcsr(addr *uint32) + +// ldmxcsr writes to the MXCSR control and status register. +func ldmxcsr(addr *uint32) + // readCR2 reads the current CR2 value. func readCR2() uintptr |