Shared memory containing steal time counter should be set to
decrypted when SEV is active.
Co-developed-by: Bo Gan <bo.gan@xxxxxxxxxxxx>
Signed-off-by: Bo Gan <bo.gan@xxxxxxxxxxxx>
Signed-off-by: Alexey Makhalov <alexey.makhalov@xxxxxxxxxxxx>
---
arch/x86/kernel/cpu/vmware.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 9883766715fe..f20bdc3128f3 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -306,9 +306,30 @@ static struct notifier_block vmware_pv_reboot_nb = {
.notifier_call = vmware_pv_reboot_notify,
};
+static void __init sev_map_percpu_data(void)
+{
+ int cpu;
+
+ if (cc_vendor != CC_VENDOR_AMD ||
+ !cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
+ return;
+
+ for_each_possible_cpu(cpu) {
+ early_set_memory_decrypted(
+ (unsigned long)&per_cpu(vmw_steal_time, cpu),
+ sizeof(vmw_steal_time));
+ }
+}
+
#ifdef CONFIG_SMP
static void __init vmware_smp_prepare_boot_cpu(void)
{
+ /*
+ * Map the per-cpu variables as decrypted before vmware_guest_cpu_init()
+ * shares the guest physical address with the hypervisor.
+ */
+ sev_map_percpu_data();
+
vmware_guest_cpu_init();
native_smp_prepare_boot_cpu();
}
@@ -371,6 +392,7 @@ static void __init vmware_paravirt_ops_setup(void)
vmware_cpu_down_prepare) < 0)
pr_err("vmware_guest: Failed to install cpu hotplug callbacks\n");
#else
+ sev_map_percpu_data();
vmware_guest_cpu_init();
#endif
}
--
2.39.4
