From: Kevin Loughlin Date: Fri, 22 Nov 2024 20:23:22 +0000 (+0000) Subject: x86/sev: Add missing RIP_REL_REF() invocations during sme_enable() X-Git-Tag: v6.15-rc1~211^2~1 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=72dafb567760320f2de7447cd6e979bf9d4e5d17;p=thirdparty%2Flinux.git x86/sev: Add missing RIP_REL_REF() invocations during sme_enable() The following commit: 1c811d403afd ("x86/sev: Fix position dependent variable references in startup code") introduced RIP_REL_REF() to force RIP-relative accesses to global variables, as needed to prevent crashes during early SEV/SME startup code. For completeness, RIP_REL_REF() should be used with additional variables during sme_enable(): https://lore.kernel.org/all/CAMj1kXHnA0fJu6zh634=fbJswp59kSRAbhW+ubDGj1+NYwZJ-Q@mail.gmail.com/ Access these vars with RIP_REL_REF() to prevent problem reoccurence. Fixes: 1c811d403afd ("x86/sev: Fix position dependent variable references in startup code") Signed-off-by: Kevin Loughlin Signed-off-by: Ingo Molnar Reviewed-by: Ard Biesheuvel Reviewed-by: Tom Lendacky Cc: Dave Hansen Link: https://lore.kernel.org/r/20241122202322.977678-1-kevinloughlin@google.com --- diff --git a/arch/x86/mm/mem_encrypt_identity.c b/arch/x86/mm/mem_encrypt_identity.c index e6c7686f443a0..9fce5b87b8c50 100644 --- a/arch/x86/mm/mem_encrypt_identity.c +++ b/arch/x86/mm/mem_encrypt_identity.c @@ -565,7 +565,7 @@ void __head sme_enable(struct boot_params *bp) } RIP_REL_REF(sme_me_mask) = me_mask; - physical_mask &= ~me_mask; - cc_vendor = CC_VENDOR_AMD; + RIP_REL_REF(physical_mask) &= ~me_mask; + RIP_REL_REF(cc_vendor) = CC_VENDOR_AMD; cc_set_mask(me_mask); }