Commit 9af9b940 authored by Tom Lendacky's avatar Tom Lendacky Committed by Ingo Molnar

x86/cpu/AMD: Handle SME reduction in physical address size

When System Memory Encryption (SME) is enabled, the physical address
space is reduced. Adjust the x86_phys_bits value to reflect this
reduction.
Signed-off-by: default avatarTom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Toshimitsu Kani <toshi.kani@hpe.com>
Cc: kasan-dev@googlegroups.com
Cc: kvm@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-doc@vger.kernel.org
Cc: linux-efi@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/593c037a3cad85ba92f3d061ffa7462e9ce3531d.1500319216.git.thomas.lendacky@amd.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 872cbefd
......@@ -613,20 +613,22 @@ static void early_init_amd(struct cpuinfo_x86 *c)
set_cpu_bug(c, X86_BUG_AMD_E400);
/*
* BIOS support is required for SME. If BIOS has not enabled SME
* then don't advertise the feature (set in scattered.c). Also,
* since the SME support requires long mode, don't advertise the
* feature under CONFIG_X86_32.
* BIOS support is required for SME. If BIOS has enabled SME then
* adjust x86_phys_bits by the SME physical address space reduction
* value. If BIOS has not enabled SME then don't advertise the
* feature (set in scattered.c). Also, since the SME support requires
* long mode, don't advertise the feature under CONFIG_X86_32.
*/
if (cpu_has(c, X86_FEATURE_SME)) {
if (IS_ENABLED(CONFIG_X86_32)) {
clear_cpu_cap(c, X86_FEATURE_SME);
} else {
u64 msr;
/* Check if SME is enabled */
rdmsrl(MSR_K8_SYSCFG, msr);
if (!(msr & MSR_K8_SYSCFG_MEM_ENCRYPT))
if (msr & MSR_K8_SYSCFG_MEM_ENCRYPT) {
c->x86_phys_bits -= (cpuid_ebx(0x8000001f) >> 6) & 0x3f;
if (IS_ENABLED(CONFIG_X86_32))
clear_cpu_cap(c, X86_FEATURE_SME);
} else {
clear_cpu_cap(c, X86_FEATURE_SME);
}
}
......
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