X86/KVM: Decrypt shared per-cpu variables when SEV is active

When SEV is active, guest memory is encrypted with a guest-specific key, a
guest memory region shared with the hypervisor must be mapped as decrypted
before it can be shared.

Signed-off-by: Brijesh Singh <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Borislav Petkov <[email protected]>
Tested-by: Borislav Petkov <[email protected]>
Cc: Tom Lendacky <[email protected]>
Cc: [email protected]
Cc: Radim Krčmář <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

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