Index: VirtualBox-6.1.2/src/VBox/HostDrivers/VBoxPci/linux/VBoxPci-linux.c
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/HostDrivers/VBoxPci/linux/VBoxPci-linux.c
+++ VirtualBox-6.1.2/src/VBox/HostDrivers/VBoxPci/linux/VBoxPci-linux.c
@@ -843,9 +843,13 @@ DECLHIDDEN(int) vboxPciOsDevMapRegion(PV
         if (!rcLnx)
         {
             /* For now no caching, try to optimize later. */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 6, 0)
+            RTR0PTR R0PtrMapping = ioremap(pci_resource_start(pPciDev, iRegion),
+                                           pci_resource_len(pPciDev, iRegion));
+#else
             RTR0PTR R0PtrMapping = ioremap_nocache(pci_resource_start(pPciDev, iRegion),
                                                    pci_resource_len(pPciDev, iRegion));
-
+#endif
             if (R0PtrMapping != NIL_RTR0PTR)
                 pIns->aRegionR0Mapping[iRegion] = R0PtrMapping;
             else
Index: VirtualBox-6.1.2/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c
+++ VirtualBox-6.1.2/src/VBox/Runtime/r0drv/linux/memobj-r0drv-linux.c
@@ -1461,9 +1461,13 @@ DECLHIDDEN(int) rtR0MemObjNativeMapKerne
              * MMIO / physical memory.
              */
             Assert(pMemLnxToMap->Core.enmType == RTR0MEMOBJTYPE_PHYS && !pMemLnxToMap->Core.u.Phys.fAllocated);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 6, 0)
+	    pMemLnx->Core.pv = ioremap(pMemLnxToMap->Core.u.Phys.PhysBase + offSub, cbSub);
+#else
             pMemLnx->Core.pv = pMemLnxToMap->Core.u.Phys.uCachePolicy == RTMEM_CACHE_POLICY_MMIO
                              ? ioremap_nocache(pMemLnxToMap->Core.u.Phys.PhysBase + offSub, cbSub)
                              : ioremap(pMemLnxToMap->Core.u.Phys.PhysBase + offSub, cbSub);
+#endif
             if (pMemLnx->Core.pv)
             {
                 /** @todo fix protection. */
Index: VirtualBox-6.1.2/include/iprt/time.h
===================================================================
--- VirtualBox-6.1.2.orig/include/iprt/time.h
+++ VirtualBox-6.1.2/include/iprt/time.h
@@ -32,6 +32,24 @@
 #include <iprt/cdefs.h>
 #include <iprt/types.h>
 #include <iprt/assertcompile.h>
+#ifdef __KERNEL__
+/* This header is used for both kernel- and user-space code. Beginning
+ * with v5.6.0-rc3 as part of the Y2038 conversion, several of the
+ * time handling macros were hidden. Thus, user- and kernel-space
+ * names are different.
+ */
+#include <linux/time_types.h>
+#include <linux/version.h>
+#include <linux/time64.h>
+#include <linux/ktime.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 6, 0)
+#define timespec __kernel_old_timespec
+#define ktime_get_ts ktime_get_ts64
+#undef time_t
+#define time_t ktime_t
+#define timeval __kernel_old_timeval
+#endif /* kernel version >= 5.6.0 */
+#endif /* __KERNEL__ */
 
 RT_C_DECLS_BEGIN
 
@@ -433,12 +451,6 @@ DECLINLINE(PRTTIMESPEC) RTTimeSpecSetTim
 }
 
 
-# ifdef _LINUX_TIME64_H
-DECLINLINE(PRTTIMESPEC) RTTimeSpecSetTimespec64(PRTTIMESPEC pTime, const struct timespec64 *pTimeval)
-{
-    return RTTimeSpecAddNano(RTTimeSpecSetSeconds(pTime, pTimeval->tv_sec), pTimeval->tv_nsec);
-}
-# endif
 #endif /* various ways of detecting struct timespec */
 
 
Index: VirtualBox-6.1.2/src/VBox/Runtime/r0drv/linux/time-r0drv-linux.c
===================================================================
--- VirtualBox-6.1.2.orig/src/VBox/Runtime/r0drv/linux/time-r0drv-linux.c
+++ VirtualBox-6.1.2/src/VBox/Runtime/r0drv/linux/time-r0drv-linux.c
@@ -35,6 +35,10 @@
 #include <iprt/asm.h>
 
 
+DECLINLINE(PRTTIMESPEC) RTTimeSpecSetTimespec64(PRTTIMESPEC pTime, const struct timespec64 *pTimeval)
+{
+    return RTTimeSpecAddNano(RTTimeSpecSetSeconds(pTime, pTimeval->tv_sec), pTimeval->tv_nsec);
+}
 
 DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
 {
@@ -43,7 +47,11 @@ DECLINLINE(uint64_t) rtTimeGetSystemNano
      * Use ktime_get_ts, this is also what clock_gettime(CLOCK_MONOTONIC,) is using.
      */
     uint64_t u64;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 6, 0)
+    struct timespec64 Ts;
+#else
     struct timespec Ts;
+#endif
     ktime_get_ts(&Ts);
     u64 = Ts.tv_sec * RT_NS_1SEC_64 + Ts.tv_nsec;
     return u64;