KVM: SVM: Prepare to reserve asid for SEV guest

Web:        https://git.kernel.org/torvalds/c/4faefff3241e02dd66bfb77bd7ca40f3aa08f62e
Commit:     4faefff3241e02dd66bfb77bd7ca40f3aa08f62e
Parent:     ba7c3398dc7eedbbe9d19a17ce3ab98349079fc7
Refname:    refs/heads/master
Author:     Brijesh Singh <[email protected]>
AuthorDate: Mon Dec 4 10:57:25 2017 -0600
Committer:  Brijesh Singh <[email protected]>
CommitDate: Mon Dec 4 10:57:25 2017 -0600

    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 <[email protected]>
    Cc: Ingo Molnar <[email protected]>
    Cc: "H. Peter Anvin" <[email protected]>
    Cc: Paolo Bonzini <[email protected]>
    Cc: "Radim Krčmář" <[email protected]>
    Cc: Joerg Roedel <[email protected]>
    Cc: Borislav Petkov <[email protected]>
    Cc: Tom Lendacky <[email protected]>
    Cc: [email protected]
    Cc: [email protected]
    Cc: [email protected]
    Signed-off-by: Brijesh Singh <[email protected]>
    Reviewed-by: Paolo Bonzini <[email protected]>
    Reviewed-by: Borislav Petkov <[email protected]>
---
 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 1c8158a6ee06..e403cf1f6ba3 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);
@@ -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;
 	}
 
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