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authorPaolo Bonzini <pbonzini@redhat.com>2017-04-27 18:33:14 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2017-04-27 18:33:14 +0300
commitc24a7be2110ddac2ab75abcded76c62dccb6b1f0 (patch)
treecb4ef87091258db6b0f94cf2d4bd938eae1e26de /arch/arm64/include/asm/virt.h
parent70f3aac964ae2bc9a0a1d5d65a62e258591ade18 (diff)
parent1edb632133efb6226b6bef3e7d9fa8c7134ac4e2 (diff)
downloadlinux-c24a7be2110ddac2ab75abcded76c62dccb6b1f0.tar.xz
Merge tag 'kvm-arm-for-v4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm into HEAD
KVM/ARM Changes for v4.12. Changes include: - Using the common sysreg definitions between KVM and arm64 - Improved hyp-stub implementation with support for kexec and kdump on the 32-bit side - Proper PMU exception handling - Performance improvements of our GIC handling - Support for irqchip in userspace with in-kernel arch-timers and PMU support - A fix for a race condition in our PSCI code Conflicts: Documentation/virtual/kvm/api.txt include/uapi/linux/kvm.h
Diffstat (limited to 'arch/arm64/include/asm/virt.h')
-rw-r--r--arch/arm64/include/asm/virt.h31
1 files changed, 22 insertions, 9 deletions
diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h
index 439f6b5d31f6..c5f89442785c 100644
--- a/arch/arm64/include/asm/virt.h
+++ b/arch/arm64/include/asm/virt.h
@@ -19,25 +19,38 @@
#define __ASM__VIRT_H
/*
- * The arm64 hcall implementation uses x0 to specify the hcall type. A value
- * less than 0xfff indicates a special hcall, such as get/set vector.
- * Any other value is used as a pointer to the function to call.
+ * The arm64 hcall implementation uses x0 to specify the hcall
+ * number. A value less than HVC_STUB_HCALL_NR indicates a special
+ * hcall, such as set vector. Any other value is handled in a
+ * hypervisor specific way.
+ *
+ * The hypercall is allowed to clobber any of the caller-saved
+ * registers (x0-x18), so it is advisable to use it through the
+ * indirection of a function call (as implemented in hyp-stub.S).
*/
-/* HVC_GET_VECTORS - Return the value of the vbar_el2 register. */
-#define HVC_GET_VECTORS 0
-
/*
* HVC_SET_VECTORS - Set the value of the vbar_el2 register.
*
* @x1: Physical address of the new vector table.
*/
-#define HVC_SET_VECTORS 1
+#define HVC_SET_VECTORS 0
/*
* HVC_SOFT_RESTART - CPU soft reset, used by the cpu_soft_restart routine.
*/
-#define HVC_SOFT_RESTART 2
+#define HVC_SOFT_RESTART 1
+
+/*
+ * HVC_RESET_VECTORS - Restore the vectors to the original HYP stubs
+ */
+#define HVC_RESET_VECTORS 2
+
+/* Max number of HYP stub hypercalls */
+#define HVC_STUB_HCALL_NR 3
+
+/* Error returned when an invalid stub number is passed into x0 */
+#define HVC_STUB_ERR 0xbadca11
#define BOOT_CPU_MODE_EL1 (0xe11)
#define BOOT_CPU_MODE_EL2 (0xe12)
@@ -61,7 +74,7 @@
extern u32 __boot_cpu_mode[2];
void __hyp_set_vectors(phys_addr_t phys_vector_base);
-phys_addr_t __hyp_get_vectors(void);
+void __hyp_reset_vectors(void);
/* Reports the availability of HYP mode */
static inline bool is_hyp_mode_available(void)