1 files changed, 94 insertions, 7 deletions

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 5e479d54918c..a3d8be8d6cfb 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -19,6 +19,8 @@
 #include <linux/vmalloc.h>
 #include <linux/hyperv.h>
 #include <linux/export.h>
+#include <linux/io.h>
+#include <linux/set_memory.h>
 #include <asm/mshyperv.h>
 
 #include "hyperv_vmbus.h"
@@ -102,8 +104,9 @@ int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo, u32 version)
 		vmbus_connection.msg_conn_id = VMBUS_MESSAGE_CONNECTION_ID;
 	}
 
-	msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages[0]);
-	msg->monitor_page2 = virt_to_phys(vmbus_connection.monitor_pages[1]);
+	msg->monitor_page1 = vmbus_connection.monitor_pages_pa[0];
+	msg->monitor_page2 = vmbus_connection.monitor_pages_pa[1];
+
 	msg->target_vcpu = hv_cpu_number_to_vp_number(VMBUS_CONNECT_CPU);
 
 	/*
@@ -216,6 +219,65 @@ int vmbus_connect(void)
 		goto cleanup;
 	}
 
+	vmbus_connection.monitor_pages_original[0]
+		= vmbus_connection.monitor_pages[0];
+	vmbus_connection.monitor_pages_original[1]
+		= vmbus_connection.monitor_pages[1];
+	vmbus_connection.monitor_pages_pa[0]
+		= virt_to_phys(vmbus_connection.monitor_pages[0]);
+	vmbus_connection.monitor_pages_pa[1]
+		= virt_to_phys(vmbus_connection.monitor_pages[1]);
+
+	if (hv_is_isolation_supported()) {
+		ret = set_memory_decrypted((unsigned long)
+					   vmbus_connection.monitor_pages[0],
+					   1);
+		ret |= set_memory_decrypted((unsigned long)
+					    vmbus_connection.monitor_pages[1],
+					    1);
+		if (ret)
+			goto cleanup;
+
+		/*
+		 * Isolation VM with AMD SNP needs to access monitor page via
+		 * address space above shared gpa boundary.
+		 */
+		if (hv_isolation_type_snp()) {
+			vmbus_connection.monitor_pages_pa[0] +=
+				ms_hyperv.shared_gpa_boundary;
+			vmbus_connection.monitor_pages_pa[1] +=
+				ms_hyperv.shared_gpa_boundary;
+
+			vmbus_connection.monitor_pages[0]
+				= memremap(vmbus_connection.monitor_pages_pa[0],
+					   HV_HYP_PAGE_SIZE,
+					   MEMREMAP_WB);
+			if (!vmbus_connection.monitor_pages[0]) {
+				ret = -ENOMEM;
+				goto cleanup;
+			}
+
+			vmbus_connection.monitor_pages[1]
+				= memremap(vmbus_connection.monitor_pages_pa[1],
+					   HV_HYP_PAGE_SIZE,
+					   MEMREMAP_WB);
+			if (!vmbus_connection.monitor_pages[1]) {
+				ret = -ENOMEM;
+				goto cleanup;
+			}
+		}
+
+		/*
+		 * Set memory host visibility hvcall smears memory
+		 * and so zero monitor pages here.
+		 */
+		memset(vmbus_connection.monitor_pages[0], 0x00,
+		       HV_HYP_PAGE_SIZE);
+		memset(vmbus_connection.monitor_pages[1], 0x00,
+		       HV_HYP_PAGE_SIZE);
+
+	}
+
 	msginfo = kzalloc(sizeof(*msginfo) +
 			  sizeof(struct vmbus_channel_initiate_contact),
 			  GFP_KERNEL);
@@ -303,10 +365,31 @@ void vmbus_disconnect(void)
 		vmbus_connection.int_page = NULL;
 	}
 
-	hv_free_hyperv_page((unsigned long)vmbus_connection.monitor_pages[0]);
-	hv_free_hyperv_page((unsigned long)vmbus_connection.monitor_pages[1]);
-	vmbus_connection.monitor_pages[0] = NULL;
-	vmbus_connection.monitor_pages[1] = NULL;
+	if (hv_is_isolation_supported()) {
+		/*
+		 * memunmap() checks input address is ioremap address or not
+		 * inside. It doesn't unmap any thing in the non-SNP CVM and
+		 * so not check CVM type here.
+		 */
+		memunmap(vmbus_connection.monitor_pages[0]);
+		memunmap(vmbus_connection.monitor_pages[1]);
+
+		set_memory_encrypted((unsigned long)
+			vmbus_connection.monitor_pages_original[0],
+			1);
+		set_memory_encrypted((unsigned long)
+			vmbus_connection.monitor_pages_original[1],
+			1);
+	}
+
+	hv_free_hyperv_page((unsigned long)
+		vmbus_connection.monitor_pages_original[0]);
+	hv_free_hyperv_page((unsigned long)
+		vmbus_connection.monitor_pages_original[1]);
+	vmbus_connection.monitor_pages_original[0] =
+		vmbus_connection.monitor_pages[0] = NULL;
+	vmbus_connection.monitor_pages_original[1] =
+		vmbus_connection.monitor_pages[1] = NULL;
 }
 
 /*
@@ -447,6 +530,10 @@ void vmbus_set_event(struct vmbus_channel *channel)
 
 	++channel->sig_events;
 
-	hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event);
+	if (hv_isolation_type_snp())
+		hv_ghcb_hypercall(HVCALL_SIGNAL_EVENT, &channel->sig_event,
+				NULL, sizeof(channel->sig_event));
+	else
+		hv_do_fast_hypercall8(HVCALL_SIGNAL_EVENT, channel->sig_event);
 }
 EXPORT_SYMBOL_GPL(vmbus_set_event);