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| author | neel <neel@FreeBSD.org> | 2014-10-17 06:23:04 +0000 |
|---|---|---|
| committer | neel <neel@FreeBSD.org> | 2014-10-17 06:23:04 +0000 |
| commit | 170f49cd346e3fe89bb5fd6322940694477b7002 (patch) | |
| tree | 9baa9d2ee53784635790097d5cbbde652089891e /sys/amd64/vmm | |
| parent | b194fc5a2b8dd89544329e2aaa9569f23c24b990 (diff) | |
| download | FreeBSD-src-170f49cd346e3fe89bb5fd6322940694477b7002.zip FreeBSD-src-170f49cd346e3fe89bb5fd6322940694477b7002.tar.gz | |
Don't advertise the Instruction Based Sampling feature because it requires
emulating a large number of MSRs.
Ignore writes to a couple more AMD-specific MSRs and return 0 on read.
This further reduces the unimplemented MSRs accessed by a Linux guest on boot.
Diffstat (limited to 'sys/amd64/vmm')
| -rw-r--r-- | sys/amd64/vmm/x86.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/amd64/vmm/x86.c b/sys/amd64/vmm/x86.c index 3c5ca19..0b32eef 100644 --- a/sys/amd64/vmm/x86.c +++ b/sys/amd64/vmm/x86.c @@ -167,6 +167,11 @@ x86_emulate_cpuid(struct vm *vm, int vcpu_id, regs[2] &= ~AMDID2_PTSCEL2I; /* + * Don't advertise Instruction Based Sampling feature. + */ + regs[2] &= ~AMDID2_IBS; + + /* * Hide rdtscp/ia32_tsc_aux until we know how * to deal with them. */ |
