diff options
Diffstat (limited to 'arch/x86/hyperv/hv_init.c')
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 318010eb9f9e..bcfbcda8b050 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -18,6 +18,7 @@ #include <asm/hyperv-tlfs.h> #include <asm/mshyperv.h> #include <asm/idtentry.h> +#include <asm/set_memory.h> #include <linux/kexec.h> #include <linux/version.h> #include <linux/vmalloc.h> @@ -106,8 +107,21 @@ static int hv_cpu_init(unsigned int cpu) * in hv_cpu_die(), otherwise a CPU may not be stopped in the * case of CPU offlining and the VM will hang. */ - if (!*hvp) + if (!*hvp) { *hvp = __vmalloc(PAGE_SIZE, GFP_KERNEL | __GFP_ZERO); + + /* + * Hyper-V should never specify a VM that is a Confidential + * VM and also running in the root partition. Root partition + * is blocked to run in Confidential VM. So only decrypt assist + * page in non-root partition here. + */ + if (*hvp && hv_isolation_type_en_snp()) { + WARN_ON_ONCE(set_memory_decrypted((unsigned long)(*hvp), 1)); + memset(*hvp, 0, PAGE_SIZE); + } + } + if (*hvp) msr.pfn = vmalloc_to_pfn(*hvp); |