diff options
| author | Andrei Vagin <avagin@google.com> | 2021-07-22 15:53:06 -0700 |
|---|---|---|
| committer | gVisor bot <gvisor-bot@google.com> | 2021-07-22 15:55:31 -0700 |
| commit | 0690c25e062ad1b8dc162b4b4d70ab59879b9bff (patch) | |
| tree | 398eb2c9eacea328748780f3040f00d37e7b909a | |
| parent | 47f025461e6fdf8da99c780b17c2227696e83845 (diff) | |
kvm: set CR0.NE = 1
CR0.NE enables internal x87 floating point error reporting when set, else
enables PC style x87 error detection.
On AMD, the #MF exception isn't generated if CR0.NE isn't set.
PiperOrigin-RevId: 386340269
| -rw-r--r-- | pkg/ring0/kernel_amd64.go | 2 | ||||
| -rw-r--r-- | pkg/ring0/x86.go | 1 |
2 files changed, 2 insertions, 1 deletions
diff --git a/pkg/ring0/kernel_amd64.go b/pkg/ring0/kernel_amd64.go index 23ec33f92..4a4c0ae26 100644 --- a/pkg/ring0/kernel_amd64.go +++ b/pkg/ring0/kernel_amd64.go @@ -177,7 +177,7 @@ func (c *CPU) TSS() (uint64, uint16, *SegmentDescriptor) { // //go:nosplit func (c *CPU) CR0() uint64 { - return _CR0_PE | _CR0_PG | _CR0_AM | _CR0_ET + return _CR0_PE | _CR0_PG | _CR0_AM | _CR0_ET | _CR0_NE } // CR4 returns the CPU's CR4 value. diff --git a/pkg/ring0/x86.go b/pkg/ring0/x86.go index 7c96cca6b..9a98703da 100644 --- a/pkg/ring0/x86.go +++ b/pkg/ring0/x86.go @@ -25,6 +25,7 @@ import ( const ( _CR0_PE = 1 << 0 _CR0_ET = 1 << 4 + _CR0_NE = 1 << 5 _CR0_AM = 1 << 18 _CR0_PG = 1 << 31 |