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| author | neel <neel@FreeBSD.org> | 2014-09-13 22:16:40 +0000 |
|---|---|---|
| committer | neel <neel@FreeBSD.org> | 2014-09-13 22:16:40 +0000 |
| commit | 32e0378b350c93dba19c615a6a91afeef12486e2 (patch) | |
| tree | 70a00007f69968f48c3915bfacf511d0235b5081 /sys/amd64/vmm/intel | |
| parent | 45bb1086d665c83d260280f8b94a5d61ed0756f3 (diff) | |
| download | FreeBSD-src-32e0378b350c93dba19c615a6a91afeef12486e2.zip FreeBSD-src-32e0378b350c93dba19c615a6a91afeef12486e2.tar.gz | |
AMD processors that have the SVM decode assist capability will store the
instruction bytes in the VMCB on a nested page fault. This is useful because
it saves having to walk the guest page tables to fetch the instruction.
vie_init() now takes two additional parameters 'inst_bytes' and 'inst_len'
that map directly to 'vie->inst[]' and 'vie->num_valid'.
The instruction emulation handler skips calling 'vmm_fetch_instruction()'
if 'vie->num_valid' is non-zero.
The use of this capability can be turned off by setting the sysctl/tunable
'hw.vmm.svm.disable_npf_assist' to '1'.
Reviewed by: Anish Gupta (akgupt3@gmail.com)
Discussed with: grehan
Diffstat (limited to 'sys/amd64/vmm/intel')
| -rw-r--r-- | sys/amd64/vmm/intel/vmx.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/amd64/vmm/intel/vmx.c b/sys/amd64/vmm/intel/vmx.c index 348cc2a..8e35781 100644 --- a/sys/amd64/vmm/intel/vmx.c +++ b/sys/amd64/vmm/intel/vmx.c @@ -1847,6 +1847,7 @@ vmexit_inst_emul(struct vm_exit *vmexit, uint64_t gpa, uint64_t gla) vmexit->u.inst_emul.cs_d = 0; break; } + vie_init(&vmexit->u.inst_emul.vie, NULL, 0); } static int |
