Use actual pointer types for pointers (instead of unsigned long) and replace hardcoded constants with the appropriate self-documenting macros.
The function is still a bit messy, but this seems a lot better than before to me. This is mostly borrowed from a patch by Thomas Garnier. Cc: Thomas Garnier <[email protected]> Cc: Jim Mattson <[email protected]> Cc: Radim Krčmář <[email protected]> Cc: Paolo Bonzini <[email protected]> Signed-off-by: Andy Lutomirski <[email protected]> --- arch/x86/kvm/vmx.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index b1810a0edec3..17ef11c64702 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2069,24 +2069,23 @@ static unsigned long segment_base(u16 selector) { struct desc_ptr *gdt = this_cpu_ptr(&host_gdt); struct desc_struct *d; - unsigned long table_base; + struct desc_struct *table; unsigned long v; - if (!(selector & ~3)) + if (!(selector & ~SEGMENT_RPL_MASK)) return 0; - table_base = gdt->address; + table = (struct desc_struct *)gdt->address; - if (selector & 4) { /* from ldt */ + if ((selector & SEGMENT_TI_MASK) == SEGMENT_LDT) { u16 ldt_selector = kvm_read_ldt(); - if (!(ldt_selector & ~3)) + if (!(ldt_selector & ~SEGMENT_RPL_MASK)) return 0; - table_base = segment_base(ldt_selector); + table = (struct desc_struct *)segment_base(ldt_selector); } - d = (struct desc_struct *)(table_base + (selector & ~7)); - v = get_desc_base(d); + v = get_desc_base(&table[selector >> 3]); return v; } #endif -- 2.9.3
