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x86/tdx: Prepare for using "INFO" call for a second purpose
commit a6dd6f3900
upstream.
The TDG.VP.INFO TDCALL provides the guest with various details about
the TDX system that the guest needs to run. Only one field is currently
used: 'gpa_width' which tells the guest which PTE bits mark pages shared
or private.
A second field is now needed: the guest "TD attributes" to tell if
virtualization exceptions are configured in a way that can harm the guest.
Make the naming and calling convention more generic and discrete from the
mask-centric one.
Thanks to Sathya for the inspiration here, but there's no code, comments
or changelogs left from where he started.
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
2f8d9b9417
commit
bc2f9bf9b5
1 changed files with 3 additions and 3 deletions
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@ -98,7 +98,7 @@ static inline void tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9,
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panic("TDCALL %lld failed (Buggy TDX module!)\n", fn);
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}
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static u64 get_cc_mask(void)
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static void tdx_parse_tdinfo(u64 *cc_mask)
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{
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struct tdx_module_output out;
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unsigned int gpa_width;
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@ -121,7 +121,7 @@ static u64 get_cc_mask(void)
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* The highest bit of a guest physical address is the "sharing" bit.
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* Set it for shared pages and clear it for private pages.
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*/
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return BIT_ULL(gpa_width - 1);
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*cc_mask = BIT_ULL(gpa_width - 1);
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}
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/*
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@ -758,7 +758,7 @@ void __init tdx_early_init(void)
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setup_force_cpu_cap(X86_FEATURE_TDX_GUEST);
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cc_set_vendor(CC_VENDOR_INTEL);
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cc_mask = get_cc_mask();
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tdx_parse_tdinfo(&cc_mask);
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cc_set_mask(cc_mask);
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/*
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