From 772ab3a95c828335d8594f547707645679d33193 Mon Sep 17 00:00:00 2001
From: Qian Wang <qian1.wang@intel.com>
Date: Thu, 24 Sep 2020 13:24:14 +0800
Subject: [PATCH] hv: remove UNCACHED for pSRAM EPT memmap segment

We remove the UNCACHED bit for pSRAM EPT memmap segment,
otherwise access to pSRAM region may bypass pSRAM.

Tracked-On: #5330

Signed-off-by: Qian Wang <qian1.wang@intel.com>
Signed-off-by: Li Fei1 <fei1.li@intel.com>
---
 hypervisor/common/hypercall.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/hypervisor/common/hypercall.c b/hypervisor/common/hypercall.c
index 0cc2cab3f..6c0867d00 100644
--- a/hypervisor/common/hypercall.c
+++ b/hypervisor/common/hypercall.c
@@ -21,6 +21,7 @@
 #include <ioapic.h>
 #include <mmio_dev.h>
 #include <ivshmem.h>
+#include <ptcm.h>
 
 #define DBG_LEVEL_HYCALL	6U
 
@@ -649,6 +650,11 @@ static int32_t add_vm_memory_region(struct acrn_vm *vm, struct acrn_vm *target_v
 			} else {
 				prot |= EPT_UNCACHED;
 			}
+#ifdef CONFIG_PTCM_ENABLED
+			if (hpa == PSRAM_BASE_HPA) {
+				prot |= EPT_WB;
+			}
+#endif
 			/* create gpa to hpa EPT mapping */
 			ept_add_mr(target_vm, pml4_page, hpa,
 					region->gpa, region->size, prot);