The patch adds initial support required to integrate Secure Encrypted
Virtualization (SEV) feature.
ASID management:
- Reserve asid range for SEV guest, SEV asid range is obtained through
CPUID Fn8000_001f[ECX]. A non-SEV guest can use any asid outside the SEV
asid range.
- SEV guest must have asid value within asid range obtained through CPUID.
- SEV guest must have the same asid for all vcpu's. A TLB flush is required
if different vcpu for the same ASID is to be run on the same host CPU.
Signed-off-by: Brijesh Singh
---
arch/x86/include/asm/kvm_host.h |8 ++
arch/x86/kvm/svm.c | 189 +++
include/uapi/linux/kvm.h| 98
3 files changed, 294 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 62651ad..fcc4710 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -719,6 +719,12 @@ struct kvm_hv {
HV_REFERENCE_TSC_PAGE tsc_ref;
};
+struct kvm_sev_info {
+ unsigned int handle;/* firmware handle */
+ unsigned int asid; /* asid for this guest */
+ int sev_fd; /* SEV device fd */
+};
+
struct kvm_arch {
unsigned int n_used_mmu_pages;
unsigned int n_requested_mmu_pages;
@@ -805,6 +811,8 @@ struct kvm_arch {
bool x2apic_format;
bool x2apic_broadcast_quirk_disabled;
+
+ struct kvm_sev_info sev_info;
};
struct kvm_vm_stat {
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 8d8fe62..fb63398 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -36,6 +36,7 @@
#include
#include
#include
+#include
#include
#include
@@ -211,6 +212,9 @@ struct vcpu_svm {
*/
struct list_head ir_list;
spinlock_t ir_list_lock;
+
+ /* which host cpu was used for running this vcpu */
+ bool last_cpuid;
};
/*
@@ -490,6 +494,64 @@ static inline bool gif_set(struct vcpu_svm *svm)
return !!(svm->vcpu.arch.hflags & HF_GIF_MASK);
}
+/* Secure Encrypted Virtualization */
+static unsigned int max_sev_asid;
+static unsigned long *sev_asid_bitmap;
+
+static bool kvm_sev_enabled(void)
+{
+ return max_sev_asid ? 1 : 0;
+}
+
+static inline struct kvm_sev_info *sev_get_info(struct kvm *kvm)
+{
+ struct kvm_arch *vm_data = &kvm->arch;
+
+ return &vm_data->sev_info;
+}
+
+static unsigned int sev_get_handle(struct kvm *kvm)
+{
+ struct kvm_sev_info *sev_info = sev_get_info(kvm);
+
+ return sev_info->handle;
+}
+
+static inline int sev_guest(struct kvm *kvm)
+{
+ return sev_get_handle(kvm);
+}
+
+static inline int sev_get_asid(struct kvm *kvm)
+{
+ struct kvm_sev_info *sev_info = sev_get_info(kvm);
+
+ if (!sev_info)
+ return -EINVAL;
+
+ return sev_info->asid;
+}
+
+static inline int sev_get_fd(struct kvm *kvm)
+{
+ struct kvm_sev_info *sev_info = sev_get_info(kvm);
+
+ if (!sev_info)
+ return -EINVAL;
+
+ return sev_info->sev_fd;
+}
+
+static inline void sev_set_asid(struct kvm *kvm, int asid)
+{
+ struct kvm_sev_info *sev_info = sev_get_info(kvm);
+
+ if (!sev_info)
+ return;
+
+ sev_info->asid = asid;
+}
+
static unsigned long iopm_base;
struct kvm_ldttss_desc {
@@ -511,6 +573,8 @@ struct svm_cpu_data {
struct kvm_ldttss_desc *tss_desc;
struct page *save_area;
+
+ struct vmcb **sev_vmcbs; /* index = sev_asid, value = vmcb pointer */
};
static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data);
@@ -764,7 +828,7 @@ 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;
native_store_gdt(&gdt_descr);
gdt = (struct desc_struct *)gdt_descr.address;
@@ -825,6 +889,7 @@ static void svm_cpu_uninit(int cpu)
per_cpu(svm_data, raw_smp_processor_id()) = NULL;
__free_page(sd->save_area);
+ kfree(sd->sev_vmcbs);
kfree(sd);
}
@@ -842,6 +907,14 @@ static int svm_cpu_init(int cpu)
if (!sd->save_area)
goto err_1;
+ if (kvm_sev_enabled()) {
+ sd->sev_vmcbs = kmalloc((max_sev_asid + 1) * sizeof(void *),
+ GFP_KERNEL);
+ r = -ENOMEM;
+ if (!sd->sev_vmcbs)
+ goto err_1;
+ }
+
per_cpu(svm_data, cpu) = sd;
return 0;
@@ -1017,6 +1090,61 @@ static int avic_ga_log_notifier(u32 ga_tag)
return 0;
}
+static __init void sev_hardware_setup(void)
+{
+ int ret, error, nguests;
+ struct sev_data_init *init;
+ struct sev_data_status *status;
+
+ /*
+* Get maximum number of encrypted guest supported: Fn8001_001F[ECX]
+* Bit 31:0: Number
