A SEV-enabled guest must use ASIDs from the defined subset, while non-SEV guests can use the remaining ASID range. The range of ASID allowed SEV guest ASIDs is [1 - CPUID_8000_001F[ECX][31:0]].
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]> --- arch/x86/kvm/svm.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 2c3a3c88596c..360f4b90f48d 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -319,6 +319,8 @@ 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; @@ -783,7 +785,7 @@ 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); @@ -1050,6 +1052,15 @@ static int avic_ga_log_notifier(u32 ga_tag) return 0; } +/* + * Get maximum number of encrypted guest supported: Fn8001_001F[ECX]. + * [31:0]: Number of supported guest + */ +static __init void sev_hardware_setup(void) +{ + max_sev_asid = cpuid_ecx(0x8000001F); +} + static __init int svm_hardware_setup(void) { int cpu; @@ -1080,6 +1091,9 @@ static __init int svm_hardware_setup(void) kvm_tsc_scaling_ratio_frac_bits = 32; } + if (boot_cpu_has(X86_FEATURE_SEV)) + sev_hardware_setup(); + if (nested) { printk(KERN_INFO "kvm: Nested Virtualization enabled\n"); kvm_enable_efer_bits(EFER_SVME | EFER_LMSLE); -- 2.9.5
