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Subject[RFC Part2 PATCH v3 05/26] KVM: SVM: Reserve ASID range for SEV guest
Date
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 for
SEV-enabled guest is from 1 to a maximum value defined via CPUID
Fn8000_001f[ECX].

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 46f41bb..06bd902 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -319,6 +319,9 @@ enum {

#define VMCB_AVIC_APIC_BAR_MASK 0xFFFFFFFFFF000ULL

+/* Secure Encrypted Virtualization */
+static unsigned int max_sev_asid;
+
static inline void mark_all_dirty(struct vmcb *vmcb)
{
vmcb->control.clean = 0;
@@ -769,7 +772,7 @@ 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);
@@ -1033,6 +1036,21 @@ static int avic_ga_log_notifier(u32 ga_tag)
return 0;
}

+static __init void sev_hardware_setup(void)
+{
+ int nguests;
+
+ /*
+ * Get maximum number of encrypted guest supported: Fn8001_001F[ECX]
+ * Bit 31:0: Number of supported guest
+ */
+ nguests = cpuid_ecx(0x8000001F);
+ if (!nguests)
+ return;
+
+ max_sev_asid = nguests;
+}
+
static __init int svm_hardware_setup(void)
{
int cpu;
@@ -1063,6 +1081,9 @@ 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);
--
2.9.4
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