Patches 1-12 are cleanup and rearrangement in order to fit FRED in more nicely.
Patches 13-22 are the start of FRED support, setting up the stacks and exception handling. By the end of this series, Xen can run a PVH dom0 (if NMIs aren't in use - VT-x has a really nasty corner case here), or can get to the point of launching a PV dom0. Running a PV dom0 is going to take a similar quantity of work. All deveopment work has been done with Intel SIMICS. I don't yet have real hardware to test on. The Gitlab CI AlderLake box, sporting both Shadow Stacks and S3 has been working overtime checking that S3 works on every relevant patch boundary. https://gitlab.com/xen-project/hardware/xen-staging/-/pipelines/1974989391 Andrew Cooper (22): x86/msr: Rename MSR_INTERRUPT_SSP_TABLE to MSR_ISST x86/msr: Rename wrmsr_ns() to wrmsrns(), and take 64bit value x86/traps: Drop incorrect BUILD_BUG_ON() and comment in load_system_tables() x86/idt: Minor improvements to _update_gate_addr_lower() x86/traps: Rename early_traps_init() to bsp_early_traps_init() x86/traps: Introduce bsp_traps_reinit() x86/spec-ctrl: Rework init_shadow_spec_ctrl_state() to take an info pointer x86/traps: Introduce ap_early_traps_init() and set up exception handling earlier x86/traps: Move load_system_tables() into traps-setup.c x86/traps: Move subarch_percpu_traps_init() into traps-setup.c x86/traps: Fold x86_64/traps.c into traps.c x86/traps: Unexport show_code() and show_stack_overflow() x86: FRED enumerations x86/traps: Extend struct cpu_user_regs/cpu_info with FRED fields x86/traps: Introduce opt_fred x86/boot: Adjust CR4 handling around ap_early_traps_init() x86/S3: Switch to using RSTORSSP to recover SSP on resume x86/traps: Set MSR_PL0_SSP in load_system_tables() x86/boot: Use RSTORSSP to establish SSP x86/traps: Alter switch_stack_and_jump() for FRED mode x86/traps: Introduce FRED entrypoints x86/traps: Enable FRED when requested docs/misc/xen-command-line.pandoc | 10 + xen/arch/x86/Kconfig | 4 + xen/arch/x86/acpi/wakeup_prot.S | 57 +-- xen/arch/x86/boot/x86_64.S | 53 ++- xen/arch/x86/cpu/common.c | 120 ------ xen/arch/x86/include/asm/asm-defns.h | 9 + xen/arch/x86/include/asm/asm_defns.h | 65 +++ xen/arch/x86/include/asm/cpu-user-regs.h | 71 +++- xen/arch/x86/include/asm/cpufeature.h | 3 + xen/arch/x86/include/asm/current.h | 14 +- xen/arch/x86/include/asm/idt.h | 13 +- xen/arch/x86/include/asm/msr-index.h | 13 +- xen/arch/x86/include/asm/msr.h | 12 +- xen/arch/x86/include/asm/processor.h | 2 - xen/arch/x86/include/asm/prot-key.h | 4 +- xen/arch/x86/include/asm/spec_ctrl.h | 4 +- xen/arch/x86/include/asm/system.h | 3 - xen/arch/x86/include/asm/traps.h | 7 +- xen/arch/x86/include/asm/x86-defns.h | 1 + xen/arch/x86/msr.c | 4 +- xen/arch/x86/setup.c | 37 +- xen/arch/x86/smpboot.c | 17 +- xen/arch/x86/spec_ctrl.c | 2 +- xen/arch/x86/traps-setup.c | 358 +++++++++++++++- xen/arch/x86/traps.c | 448 +++++++++++++++++++- xen/arch/x86/x86_64/Makefile | 2 +- xen/arch/x86/x86_64/entry-fred.S | 35 ++ xen/arch/x86/x86_64/traps.c | 414 ------------------ xen/include/public/arch-x86/cpufeatureset.h | 3 + xen/include/xen/macros.h | 2 + 30 files changed, 1142 insertions(+), 645 deletions(-) create mode 100644 xen/arch/x86/x86_64/entry-fred.S delete mode 100644 xen/arch/x86/x86_64/traps.c -- 2.39.5
