From f4495615d76cfe5a633b0886b5c30310ed94c357 Mon Sep 17 00:00:00 2001 From: Ashish Kalra Date: Tue, 24 Aug 2021 11:07:07 +0000 Subject: x86/kvm: Add guest support for detecting and enabling SEV Live Migration feature. The guest support for detecting and enabling SEV Live migration feature uses the following logic : - kvm_init_plaform() checks if its booted under the EFI - If not EFI, i) if kvm_para_has_feature(KVM_FEATURE_MIGRATION_CONTROL), issue a wrmsrl() to enable the SEV live migration support - If EFI, i) If kvm_para_has_feature(KVM_FEATURE_MIGRATION_CONTROL), read the UEFI variable which indicates OVMF support for live migration ii) the variable indicates live migration is supported, issue a wrmsrl() to enable the SEV live migration support The EFI live migration check is done using a late_initcall() callback. Also, ensure that _bss_decrypted section is marked as decrypted in the hypervisor's guest page encryption status tracking. Signed-off-by: Ashish Kalra Reviewed-by: Steve Rutherford Message-Id: Signed-off-by: Paolo Bonzini --- arch/x86/include/asm/mem_encrypt.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'arch/x86/include/asm/mem_encrypt.h') diff --git a/arch/x86/include/asm/mem_encrypt.h b/arch/x86/include/asm/mem_encrypt.h index 9c80c68d75b5..8dd373cc8b66 100644 --- a/arch/x86/include/asm/mem_encrypt.h +++ b/arch/x86/include/asm/mem_encrypt.h @@ -43,6 +43,8 @@ void __init sme_enable(struct boot_params *bp); int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size); int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size); +void __init early_set_mem_enc_dec_hypercall(unsigned long vaddr, int npages, + bool enc); void __init mem_encrypt_free_decrypted_mem(void); @@ -83,6 +85,8 @@ static inline int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; } static inline int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; } +static inline void __init +early_set_mem_enc_dec_hypercall(unsigned long vaddr, int npages, bool enc) {} static inline void mem_encrypt_free_decrypted_mem(void) { } -- cgit v1.2.3