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    Subject[RFCv2 06/13] x86/realmode: Share trampoline area if KVM memory protection enabled
    Date
    If KVM memory protection is active, the trampoline area will need to be
    in shared memory.

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    ---
    arch/x86/realmode/init.c | 7 ++++---
    1 file changed, 4 insertions(+), 3 deletions(-)

    diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
    index 22fda7d99159..f3b54b5da693 100644
    --- a/arch/x86/realmode/init.c
    +++ b/arch/x86/realmode/init.c
    @@ -10,6 +10,7 @@
    #include <asm/tlbflush.h>
    #include <asm/crash.h>
    #include <asm/sev-es.h>
    +#include <asm/kvm_para.h>

    struct real_mode_header *real_mode_header;
    u32 *trampoline_cr4_features;
    @@ -75,11 +76,11 @@ static void __init setup_real_mode(void)
    base = (unsigned char *)real_mode_header;

    /*
    - * If SME is active, the trampoline area will need to be in
    - * decrypted memory in order to bring up other processors
    + * If SME or KVM memory protection is active, the trampoline area will
    + * need to be in decrypted memory in order to bring up other processors
    * successfully. This is not needed for SEV.
    */
    - if (sme_active())
    + if (sme_active() || kvm_mem_protected())
    set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT);

    memcpy(base, real_mode_blob, size);
    --
    2.26.3
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