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KVM: SVM: Prepare to reserve asid for SEV guest

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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: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Brijesh Singh 2017-12-04 10:57:25 -06:00
parent ba7c3398dc
commit 4faefff324
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kvm/svm.c
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@ -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;
}