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    Subject[Part2 PATCH v6 23/38] KVM: SVM: Reserve ASID range for SEV guest
    Date
    A SEV-enabled guest must use ASIDs from the defined subset, while non-SEV
    guests can use the remaining ASID range. The range of allowed SEV guest
    ASIDs is [1 - CPUID_8000_001F[ECX][31:0]].

    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
    Improvements-by: Borislav Petkov <bp@suse.de>
    Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
    ---
    arch/x86/kvm/svm.c | 23 ++++++++++++++++++++++-
    1 file changed, 22 insertions(+), 1 deletion(-)

    diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    index be2e98c01b22..d4b62536e305 100644
    --- a/arch/x86/kvm/svm.c
    +++ b/arch/x86/kvm/svm.c
    @@ -323,6 +323,8 @@ enum {

    #define VMCB_AVIC_APIC_BAR_MASK 0xFFFFFFFFFF000ULL

    +static unsigned int max_sev_asid;
    +
    static inline void mark_all_dirty(struct vmcb *vmcb)
    {
    vmcb->control.clean = 0;
    @@ -787,7 +789,7 @@ 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;
    + sd->min_asid = max_sev_asid + 1;

    gdt = get_current_gdt_rw();
    sd->tss_desc = (struct kvm_ldttss_desc *)(gdt + GDT_ENTRY_TSS);
    @@ -1054,6 +1056,15 @@ static int avic_ga_log_notifier(u32 ga_tag)
    return 0;
    }

    +/*
    + * Get the maximum number of encrypted guests:
    + * Fn8001_001F[ECX][31:0]: Number of supported guests.
    + */
    +static __init void sev_hardware_setup(void)
    +{
    + max_sev_asid = cpuid_ecx(0x8000001F);
    +}
    +
    static __init int svm_hardware_setup(void)
    {
    int cpu;
    @@ -1084,6 +1095,16 @@ static __init int svm_hardware_setup(void)
    kvm_tsc_scaling_ratio_frac_bits = 32;
    }

    + if (sev) {
    + if (boot_cpu_has(X86_FEATURE_SEV) &&
    + IS_ENABLED(CONFIG_KVM_AMD_SEV)) {
    + sev_hardware_setup();
    + pr_info("SEV supported\n");
    + } else {
    + sev = false;
    + }
    + }
    +
    if (nested) {
    printk(KERN_INFO "kvm: Nested Virtualization enabled\n");
    kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE);
    --
    2.9.5
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