ANDROID: virt: gunyah: add addrspace_modify_pages hypercall

The addrspace_modify_pages hypercall is used to unlock stage-2 page
table entries, which allows the host/owner to unmap and reclaim those
pages from guest.

Bug: 395833312
Change-Id: I4168235333294a2647543eeda8beeaa40b0f7726
Signed-off-by: Elliot Berman <elliot.berman@oss.qualcomm.com>

arch/arm64/gunyah/gunyah_hypercall.c

@@ -45,6 +45,7 @@ EXPORT_SYMBOL_GPL(arch_is_gunyah_guest);
 #define GUNYAH_HYPERCALL_ADDRSPACE_UNMAP	GUNYAH_HYPERCALL(0x802C)
 #define GUNYAH_HYPERCALL_MEMEXTENT_DONATE	GUNYAH_HYPERCALL(0x8061)
 #define GUNYAH_HYPERCALL_VCPU_RUN		GUNYAH_HYPERCALL(0x8065)
+#define GUNYAH_HYPERCALL_ADDRSPC_MODIFY_PAGES	GUNYAH_HYPERCALL(0x8069)
 #define GUNYAH_HYPERCALL_ADDRSPACE_FIND_INFO_AREA	GUNYAH_HYPERCALL(0x806a)
 /* clang-format on */
 
@@ -67,6 +68,18 @@ void gunyah_hypercall_hyp_identify(
 }
 EXPORT_SYMBOL_GPL(gunyah_hypercall_hyp_identify);
 
+enum gunyah_error gunyah_hypercall_addrspc_modify_pages(u64 capid, u64 addr,
+						    u64 size, u64 flags)
+{
+	struct arm_smccc_res res;
+
+	arm_smccc_1_1_hvc(GUNYAH_HYPERCALL_ADDRSPC_MODIFY_PAGES, capid,
+						addr, size, flags, &res);
+
+	return res.a0;
+}
+EXPORT_SYMBOL_GPL(gunyah_hypercall_addrspc_modify_pages);
+
 /**
  * gunyah_hypercall_bell_send() - Assert a gunyah doorbell
  * @capid: capability ID of the doorbell

include/linux/gunyah.h

@@ -492,6 +492,11 @@ enum gunyah_error
 gunyah_hypercall_vcpu_run(u64 capid, unsigned long *resume_data,
 			  struct gunyah_hypercall_vcpu_run_resp *resp);
 
+#define GUNYAH_ADDRSPC_MODIFY_FLAG_UNLOCK_BIT		0
+#define GUNYAH_ADDRSPC_MODIFY_FLAG_SANITIZE_BIT		1
+enum gunyah_error
+gunyah_hypercall_addrspc_modify_pages(u64 capid, u64 addr, u64 size, u64 flags);
+
 enum gunyah_error
 gunyah_hypercall_addrspace_find_info_area(unsigned long *ipa, unsigned long *size);