KVM: Add CPUID support for VIA CPU

The CPUIDs for Centaur are added, and then the features of
PadLock hardware engine on VIA CPU, such as "ace", "ace_en"
and so on, can be passed into the kvm guest.

Signed-off-by: Brilly Wu <brillywu@viatech.com.cn>
Signed-off-by: Kary Jin <karyjin@viatech.com.cn>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f5f2d3d44577..22bc69ccf3ef 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2336,6 +2336,12 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
                 F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(XOP) |
                 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM);
 
+        /* cpuid 0xC0000001.edx */
+        const u32 kvm_supported_word5_x86_features =
+                F(XSTORE) | F(XSTORE_EN) | F(XCRYPT) | F(XCRYPT_EN) |
+                F(ACE2) | F(ACE2_EN) | F(PHE) | F(PHE_EN) |
+                F(PMM) | F(PMM_EN);
+
         /* all calls to cpuid_count() should be made on the same cpu */
         get_cpu();
         do_cpuid_1_ent(entry, function, index);
@@ -2445,6 +2451,20 @@ static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
                 entry->ecx &= kvm_supported_word6_x86_features;
                 cpuid_mask(&entry->ecx, 6);
                 break;
+        /*Add support for Centaur's CPUID instruction*/
+        case 0xC0000000:
+                /*Just support up to 0xC0000004 now*/
+                entry->eax = min(entry->eax, 0xC0000004);
+                break;
+        case 0xC0000001:
+                entry->edx &= kvm_supported_word5_x86_features;
+                cpuid_mask(&entry->edx, 5);
+                break;
+        case 0xC0000002:
+        case 0xC0000003:
+        case 0xC0000004:
+                /*Now nothing to do, reserved for the future*/
+                break;
         }
 
         kvm_x86_ops->set_supported_cpuid(function, entry);
@@ -2491,6 +2511,26 @@ static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
         if (nent >= cpuid->nent)
                 goto out_free;
 
+        /* Add support for Centaur's CPUID instruction. */
+        if (boot_cpu_data.x86_vendor == X86_VENDOR_CENTAUR) {
+                do_cpuid_ent(&cpuid_entries[nent], 0xC0000000, 0,
+                                &nent, cpuid->nent);
+
+                r = -E2BIG;
+                if (nent >= cpuid->nent)
+                        goto out_free;
+
+                limit = cpuid_entries[nent - 1].eax;
+                for (func = 0xC0000001;
+                        func <= limit && nent < cpuid->nent; ++func)
+                        do_cpuid_ent(&cpuid_entries[nent], func, 0,
+                                        &nent, cpuid->nent);
+
+                r = -E2BIG;
+                if (nent >= cpuid->nent)
+                        goto out_free;
+        }
+
         do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_SIGNATURE, 0, &nent,
                      cpuid->nent);