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Commit 4faefff3 authored by Brijesh Singh's avatar Brijesh Singh
Browse files

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@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Borislav Petkov <bp@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: x86@kernel.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: default avatarBrijesh Singh <brijesh.singh@amd.com>
Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
parent ba7c3398

arch/x86/kvm/svm.c

+3 −1
Original line number Diff line number Diff line
@@ -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);
@@ -2088,7 +2090,7 @@ 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;

	}