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Use tunable 'hw.vmm.svm.features' to disable specific SVM features even

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though they might be available in hardware.

Use tunable 'hw.vmm.svm.num_asids' to limit the number of ASIDs used by
the hypervisor.

MFC after:	1 week
This commit is contained in:
neel 2015-06-04 02:12:23 +00:00
parent cb7b7bf9fb
commit 0a2b315713
1 changed files with 10 additions and 5 deletions
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15
sys/amd64/vmm/amd/svm.c
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@ -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 */