x86: Add support for changing memory encryption attribute in early boot

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Some KVM-specific custom MSRs share the guest physical address with the
hypervisor in early boot. When SEV is active, the shared physical address
must be mapped with memory encryption attribute cleared so that both
hypervisor and guest can access the data.

Add APIs to change the memory encryption attribute in early boot code.

Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Borislav Petkov <bp@suse.de>
Tested-by: Borislav Petkov <bp@suse.de>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: kvm@vger.kernel.org
Cc: Borislav Petkov <bp@alien8.de>
Link: https://lkml.kernel.org/r/20171020143059.3291-15-brijesh.singh@amd.com

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Brijesh Singh 2017-10-20 09:30:56 -05:00 • committed by Thomas Gleixner

parent 606b21d4a6

commit dfaaec9033

2 changed files with 138 additions and 0 deletions

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8

arch/x86/include/asm/mem_encrypt.h

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130

arch/x86/mm/mem_encrypt.c

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