| From | Brijesh Singh <> | Subject | [RFC Part2 PATCH v3 04/26] KVM: SVM: Prepare to reserve asid for SEV guest | Date | Mon, 24 Jul 2017 15:02:41 -0500 |
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In current implementation, asid allocation starts from 1, this patch adds a min_asid variable in svm_vcpu structure to allow starting asid from something other than 1.
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> --- arch/x86/kvm/svm.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 6af04dd..46f41bb 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -511,6 +511,7 @@ struct svm_cpu_data { u64 asid_generation; u32 max_asid; u32 next_asid; + u32 min_asid; struct kvm_ldttss_desc *tss_desc; struct page *save_area; @@ -768,6 +769,7 @@ static int svm_hardware_enable(void) sd->asid_generation = 1; sd->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1; sd->next_asid = sd->max_asid + 1; + sd->min_asid = 1; gdt = get_current_gdt_rw(); sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS); @@ -2072,7 +2074,7 @@ static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd) { if (sd->next_asid > sd->max_asid) { ++sd->asid_generation; - sd->next_asid = 1; + sd->next_asid = sd->min_asid; svm->vmcb->control.tlb_ctl = TLB_CONTROL_FLUSH_ALL_ASID; } -- 2.9.4
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