x86/trapnr: Add event type macros to <asm/trapnr.h>

Intel VT-x classifies events into eight different types, which is inherited
by FRED for event identification. As such, event types becomes a common x86
concept, and should be defined in a common x86 header.

Add event type macros to <asm/trapnr.h>, and use them in <asm/vmx.h>.

Suggested-by: H. Peter Anvin (Intel) <hpa@zytor.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20231205105030.8698-4-xin3.li@intel.com

x86/boot/compressed/64: Add stage1 #VC handler

Add the first handler for #VC exceptions. At stage 1 there is no GHCB
yet because the kernel might still be running on the EFI page table.

The stage 1 handler is limited to the MSR-based protocol to talk to the
hypervisor and can only support CPUID exit-codes, but that is enough to
get to stage 2.

[ bp: Zap superfluous newlines after rd/wrmsr instruction mnemonics. ]

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20200907131613.12703-20-joro@8bytes.org

x86/traps: Split trap numbers out in a separate header

So they can be used in ASM code. For this it is also necessary to convert
them to defines. Will be used for the rework of the entry code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200505134903.731004084@linutronix.de