[RFC PATCH V4 12/12] x86/HV: Not set memory decrypted/encrypted during kexec alloc/free page in IVM

[Tianyu Lan <ltykernel@xxxxxxxxx>]

From: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>

Hyper-V Isolation VM reuses set_memory_decrypted/encrypted function
and not needs to decrypt/encrypt memory in arch_kexec_post_alloc(pre_free)
_pages() just likes AMD SEV VM. So skip them.

Signed-off-by: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
---
 arch/x86/kernel/machine_kexec_64.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/machine_kexec_64.c 
b/arch/x86/kernel/machine_kexec_64.c
index c078b0d3ab0e..0cadc64b6873 100644
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -26,6 +26,7 @@
 #include <asm/kexec-bzimage64.h>
 #include <asm/setup.h>
 #include <asm/set_memory.h>
+#include <asm/mshyperv.h>
 
 #ifdef CONFIG_ACPI
 /*
@@ -598,7 +599,7 @@ void arch_kexec_unprotect_crashkres(void)
  */
 int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp)
 {
-       if (sev_active())
+       if (sev_active() || hv_is_isolation_supported())
                return 0;
 
        /*
@@ -611,7 +612,7 @@ int arch_kexec_post_alloc_pages(void *vaddr, unsigned int 
pages, gfp_t gfp)
 
 void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages)
 {
-       if (sev_active())
+       if (sev_active() || hv_is_isolation_supported())
                return;
 
        /*
-- 
2.25.1