From: Tianyu Lan <tiala@xxxxxxxxxxxxx>
Hypervisor needs to access iput arg page and guest should decrypt
the page.
Signed-off-by: Tianyu Lan <tiala@xxxxxxxxxxxxx>
---
drivers/hv/hv_common.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 2c6602571c47..c16961e686a0 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -21,6 +21,7 @@
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/dma-map-ops.h>
+#include <linux/set_memory.h>
#include <asm/hyperv-tlfs.h>
#include <asm/mshyperv.h>
@@ -125,6 +126,7 @@ int hv_common_cpu_init(unsigned int cpu)
u64 msr_vp_index;
gfp_t flags;
int pgcount = hv_root_partition ? 2 : 1;
+ int ret;
/* hv_cpu_init() can be called with IRQs disabled from hv_resume() */
flags = irqs_disabled() ? GFP_ATOMIC : GFP_KERNEL;
@@ -134,6 +136,16 @@ int hv_common_cpu_init(unsigned int cpu)
if (!(*inputarg))
return -ENOMEM;
+ if (hv_isolation_type_en_snp()) {
+ ret = set_memory_decrypted((unsigned long)*inputarg, 1);
+ if (ret) {
+ kfree(*inputarg);
+ return ret;
+ }
+
+ memset(*inputarg, 0x00, PAGE_SIZE);
+ }
+
if (hv_root_partition) {
outputarg = (void **)this_cpu_ptr(hyperv_pcpu_output_arg);
*outputarg = (char *)(*inputarg) + HV_HYP_PAGE_SIZE;
@@ -168,6 +180,9 @@ int hv_common_cpu_die(unsigned int cpu)
local_irq_restore(flags);
+ if (hv_isolation_type_en_snp())
+ set_memory_encrypted((unsigned long)mem, 1);
+
kfree(mem);
return 0;
--
2.25.1
