Commit a6dd6f39 authored by Dave Hansen's avatar Dave Hansen
Browse files

x86/tdx: Prepare for using "INFO" call for a second purpose 



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: default avatarDave Hansen <dave.hansen@linux.intel.com>
Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Tested-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: stable@vger.kernel.org
parent 9440c429

arch/x86/coco/tdx/tdx.c

+3 −3
Original line number Original line Diff line number Diff line
@@ -98,7 +98,7 @@ static inline void tdx_module_call(u64 fn, u64 rcx, u64 rdx, u64 r8, u64 r9, 
		panic("TDCALL %lld failed (Buggy TDX module!)\n", fn);

		panic("TDCALL %lld failed (Buggy TDX module!)\n", fn);

}

}





static u64 get_cc_mask(void)

static void tdx_parse_tdinfo(u64 *cc_mask)

{

{

	struct tdx_module_output out;

	struct tdx_module_output out;

	unsigned int gpa_width;

	unsigned int gpa_width;
@@ -121,7 +121,7 @@ static u64 get_cc_mask(void) 
	 * The highest bit of a guest physical address is the "sharing" bit.

	 * The highest bit of a guest physical address is the "sharing" bit.

	 * Set it for shared pages and clear it for private pages.

	 * Set it for shared pages and clear it for private pages.

	 */

	 */

	return BIT_ULL(gpa_width - 1);

	*cc_mask = BIT_ULL(gpa_width - 1);

}

}





/*

/*
@@ -758,7 +758,7 @@ void __init tdx_early_init(void) 
	setup_force_cpu_cap(X86_FEATURE_TDX_GUEST);

	setup_force_cpu_cap(X86_FEATURE_TDX_GUEST);





	cc_set_vendor(CC_VENDOR_INTEL);

	cc_set_vendor(CC_VENDOR_INTEL);

	cc_mask = get_cc_mask();

	tdx_parse_tdinfo(&cc_mask);

	cc_set_mask(cc_mask);

	cc_set_mask(cc_mask);





	/*

	/*