mirror of https://gitee.com/openkylin/linux.git
1958b5fc40
Early in the boot process, add checks to determine if the kernel is running with Secure Encrypted Virtualization (SEV) active. Checking for SEV requires checking that the kernel is running under a hypervisor (CPUID 0x00000001, bit 31), that the SEV feature is available (CPUID 0x8000001f, bit 1) and then checking a non-interceptable SEV MSR (0xc0010131, bit 0). This check is required so that during early compressed kernel booting the pagetables (both the boot pagetables and KASLR pagetables (if enabled) are updated to include the encryption mask so that when the kernel is decompressed into encrypted memory, it can boot properly. After the kernel is decompressed and continues booting the same logic is used to check if SEV is active and set a flag indicating so. This allows to distinguish between SME and SEV, each of which have unique differences in how certain things are handled: e.g. DMA (always bounce buffered with SEV) or EFI tables (always access decrypted with SME). Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> 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: Laura Abbott <labbott@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: kvm@vger.kernel.org Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Link: https://lkml.kernel.org/r/20171020143059.3291-13-brijesh.singh@amd.com |
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