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Date: Wed, 1 Nov 2017 16:15:50 -0500 From: Brijesh Singh <brijesh.singh@....com> To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org Cc: bp@...en8.de, Brijesh Singh <brijesh.singh@....com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, Paolo Bonzini <pbonzini@...hat.com>, Radim Krčmář <rkrcmar@...hat.com>, Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...e.de>, Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org Subject: [Part2 PATCH v7 05/38] KVM: SVM: Prepare to reserve asid for SEV guest Currently, ASID allocation start at 1. Add a svm_vcpu_data.min_asid which allows supplying a dynamic start ASID. Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Ingo Molnar <mingo@...hat.com> Cc: "H. Peter Anvin" <hpa@...or.com> Cc: Paolo Bonzini <pbonzini@...hat.com> Cc: "Radim Krčmář" <rkrcmar@...hat.com> Cc: Joerg Roedel <joro@...tes.org> Cc: Borislav Petkov <bp@...e.de> Cc: Tom Lendacky <thomas.lendacky@....com> Cc: x86@...nel.org Cc: kvm@...r.kernel.org Cc: linux-kernel@...r.kernel.org Signed-off-by: Brijesh Singh <brijesh.singh@....com> Reviewed-by: Paolo Bonzini <pbonzini@...hat.com> Reviewed-by: Borislav Petkov <bp@...e.de> --- 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 8186b8d7c469..2c3a3c88596c 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -525,6 +525,7 @@ 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; @@ -782,6 +783,7 @@ 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); @@ -2091,7 +2093,7 @@ 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; } -- 2.9.5
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