mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-12 13:55:32 +00:00
Code Issues Releases Wiki Activity

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

Browse source 
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:
Dave Hansen 2022-10-28 17:12:19 +03:00 committed by Greg Kroah-Hartman
parent 2f8d9b9417
commit bc2f9bf9b5
1 changed files with 3 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
arch/x86/coco/tdx/tdx.c
View file

@ -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);
}
static u64 get_cc_mask(void)
static void tdx_parse_tdinfo(u64 *cc_mask)
{
struct tdx_module_output out;
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.
* 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);
cc_set_vendor(CC_VENDOR_INTEL);
cc_mask = get_cc_mask();
tdx_parse_tdinfo(&cc_mask);
cc_set_mask(cc_mask);
/*