From: Tianyu Lan <tiala@xxxxxxxxxxxxx>
hv vp assist page is shared between sev snp guest and hyperv. Decrypt
the page when use it.
Signed-off-by: Tianyu Lan <tiala@xxxxxxxxxxxxx>
---
arch/x86/hyperv/hv_init.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c
index 29774126e931..4600c5941957 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -30,6 +30,7 @@
#include <clocksource/hyperv_timer.h>
#include <linux/highmem.h>
#include <linux/swiotlb.h>
+#include <linux/set_memory.h>
int hyperv_init_cpuhp;
u64 hv_current_partition_id = ~0ull;
@@ -112,6 +113,11 @@ static int hv_cpu_init(unsigned int cpu)
}
WARN_ON(!(*hvp));
if (*hvp) {
+ if (hv_isolation_type_en_snp()) {
+ WARN_ON_ONCE(set_memory_decrypted((unsigned long)(*hvp), 1) != 0);
+ memset(*hvp, 0, PAGE_SIZE);
+ }
+
msr.enable = 1;
wrmsrl(HV_X64_MSR_VP_ASSIST_PAGE, msr.as_uint64);
}
@@ -228,6 +234,12 @@ static int hv_cpu_die(unsigned int cpu)
if (hv_vp_assist_page && hv_vp_assist_page[cpu]) {
union hv_vp_assist_msr_contents msr = { 0 };
+
+ if (hv_isolation_type_en_snp())
+ WARN_ON_ONCE(set_memory_encrypted(
+ (unsigned long)hv_vp_assist_page[cpu],
+ 1) != 0);
+
if (hv_root_partition) {
/*
* For root partition the VP assist page is mapped to
--
2.25.1
