[Resend RFC PATCH V4 13/13] x86/HV: Not set memory decrypted/encrypted during kexec alloc/free page in IVM

Tianyu Lan
2021-07-07T15:47:58Z

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

Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
---
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