diff options
Diffstat (limited to 'sys/amd64/vmm/amd/svm.c')
-rw-r--r-- | sys/amd64/vmm/amd/svm.c | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/sys/amd64/vmm/amd/svm.c b/sys/amd64/vmm/amd/svm.c index 53b12b7..b25d69d 100644 --- a/sys/amd64/vmm/amd/svm.c +++ b/sys/amd64/vmm/amd/svm.c @@ -102,8 +102,8 @@ static MALLOC_DEFINE(M_SVM_VLAPIC, "svm-vlapic", "svm-vlapic"); /* Per-CPU context area. */ extern struct pcpu __pcpu[]; -static uint32_t svm_feature; /* AMD SVM features. */ -SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, features, CTLFLAG_RD, &svm_feature, 0, +static uint32_t svm_feature = ~0U; /* AMD SVM features. */ +SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, features, CTLFLAG_RDTUN, &svm_feature, 0, "SVM features advertised by CPUID.8000000AH:EDX"); static int disable_npf_assist; @@ -112,7 +112,7 @@ SYSCTL_INT(_hw_vmm_svm, OID_AUTO, disable_npf_assist, CTLFLAG_RWTUN, /* Maximum ASIDs supported by the processor */ static uint32_t nasid; -SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, num_asids, CTLFLAG_RD, &nasid, 0, +SYSCTL_UINT(_hw_vmm_svm, OID_AUTO, num_asids, CTLFLAG_RDTUN, &nasid, 0, "Number of ASIDs supported by this processor"); /* Current ASID generation for each host cpu */ @@ -174,9 +174,14 @@ check_svm_features(void) /* CPUID Fn8000_000A is for SVM */ do_cpuid(0x8000000A, regs); - svm_feature = regs[3]; + svm_feature &= regs[3]; - nasid = regs[1]; + /* + * The number of ASIDs can be configured to be less than what is + * supported by the hardware but not more. + */ + if (nasid == 0 || nasid > regs[1]) + nasid = regs[1]; KASSERT(nasid > 1, ("Insufficient ASIDs for guests: %#x", nasid)); /* bhyve requires the Nested Paging feature */ |