Re: [kvm-unit-tests PATCH v2 04/17] x86 UEFI: Boot from UEFI

[Andrew Jones <drjones@redhat.com>]

On Fri, Aug 27, 2021 at 03:12:09AM +0000, Zixuan Wang wrote:
> This commit provides initial support for x86 test cases to boot from
> UEFI:
> 
>    1. UEFI compiler flags are added to Makefile
>    2. A new TARGET_EFI macro is added to turn on/off UEFI startup code
>    3. Previous Multiboot setup code is refactored and updated for
>       supporting UEFI, including the following changes:
>       1. x86/efi/crt0-efi-x86_64.S: provides entry point and jumps to
>          setup code in lib/efi.c.
>       2. lib/efi.c: performs UEFI setup, calls arch-related setup
>          functions, then jumps to test case main() function
>       3. lib/x86/setup.c: provides arch-related setup under UEFI
> 
> To build test cases for UEFI, please first install the GNU-EFI library.
> Check x86/efi/README.md for more details.
> 
> This commit is tested by a simple test calling report() and
> report_summayr(). This commit does not include such a test to avoid
> unnecessary files added into git history. To build and run this test in
> UEFI (assuming file name is x86/dummy.c):
> 
>    ./configure --target-efi
>    make x86/dummy.efi
>    ./x86/efi/run ./x86/dummy.efi
> 
> To use the default Multiboot instead of UEFI:
> 
>    ./configure
>    make x86/dummy.flat
>    ./x86/run ./x86/dummy.flat
> 
> Some x86 test cases require additional fixes to work in UEFI, e.g.,
> converting to position independent code (PIC), setting up page tables,
> etc. This commit does not provide these fixes, so compiling and running
> UEFI test cases other than x86/dummy.c may trigger compiler errors or
> QEMU crashes. These test cases will be fixed by the follow-up commits in
> this series.
> 
> The following code is ported from github.com/rhdrjones/kvm-unit-tests
>    - ./configure: 'target-efi'-related code
> 
> See original code:
>    - Repo: https://github.com/rhdrjones/kvm-unit-tests
>    - Branch: target-efi
> 
> Co-developed-by: Varad Gautam <varad.gautam@suse.com>
> Signed-off-by: Varad Gautam <varad.gautam@suse.com>
> Signed-off-by: Zixuan Wang <zixuanwang@google.com>
> ---
>  .gitignore             |  3 ++
>  Makefile               | 29 +++++++++++++++++-
>  README.md              |  6 ++++
>  configure              |  6 ++++
>  lib/efi.c              | 38 ++++++++++++++++++++----
>  lib/efi.h              | 17 +++++++++++
>  lib/linux/uefi.h       | 10 +++++--
>  lib/x86/asm/setup.h    | 11 +++++++
>  lib/x86/setup.c        | 15 ++++++++++
>  x86/Makefile.common    | 67 +++++++++++++++++++++++++++++++-----------
>  x86/Makefile.i386      |  5 ++--
>  x86/Makefile.x86_64    | 54 ++++++++++++++++++++++------------
>  x86/efi/README.md      | 40 ++++++++++++++++++++++++-
>  x86/efi/reloc_x86_64.c |  9 ++----
>  x86/efi/run            | 63 +++++++++++++++++++++++++++++++++++++++
>  x86/run                | 16 ++++++++--
>  16 files changed, 333 insertions(+), 56 deletions(-)
>  create mode 100644 lib/efi.h
>  create mode 100644 lib/x86/asm/setup.h
>  create mode 100755 x86/efi/run
> 
> diff --git a/.gitignore b/.gitignore
> index b3cf2cb..dca6d29 100644
> --- a/.gitignore
> +++ b/.gitignore
> @@ -3,7 +3,9 @@ tags
>  *.a
>  *.d
>  *.o
> +*.so
>  *.flat
> +*.efi
>  *.elf
>  .pc
>  patches
> @@ -24,3 +26,4 @@ cscope.*
>  /api/dirty-log-perf
>  /s390x/*.bin
>  /s390x/snippets/*/*.gbin
> +/efi-tests/*
> diff --git a/Makefile b/Makefile
> index f7b9f28..c4a3905 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -38,6 +38,29 @@ LIBFDT_archive = $(LIBFDT_objdir)/libfdt.a
>  
>  OBJDIRS += $(LIBFDT_objdir)
>  
> +# EFI App
> +ifeq ($(TARGET_EFI),y)
> +ifeq ($(ARCH_NAME),x86_64)
> +EFI_ARCH = x86_64
> +else
> +$(error Cannot build $(ARCH_NAME) tests as EFI apps)
> +endif
> +EFI_CFLAGS := -DTARGET_EFI
> +# The following CFLAGS and LDFLAGS come from:
> +#   - GNU-EFI/Makefile.defaults
> +#   - GNU-EFI/apps/Makefile
> +# Function calls must include the number of arguments passed to the functions
> +# More details: https://wiki.osdev.org/GNU-EFI
> +EFI_CFLAGS += -maccumulate-outgoing-args
> +# GCC defines wchar to be 32 bits, but EFI expects 16 bits
> +EFI_CFLAGS += -fshort-wchar
> +# EFI applications use PIC as they are loaded to dynamic addresses, not a fixed
> +# starting address
> +EFI_CFLAGS += -fPIC
> +# Create shared library
> +EFI_LDFLAGS := -Bsymbolic -shared -nostdlib
> +endif
> +
>  #include architecture specific make rules
>  include $(SRCDIR)/$(TEST_DIR)/Makefile
>  
> @@ -62,7 +85,11 @@ COMMON_CFLAGS += $(fno_stack_protector)
>  COMMON_CFLAGS += $(fno_stack_protector_all)
>  COMMON_CFLAGS += $(wno_frame_address)
>  COMMON_CFLAGS += $(if $(U32_LONG_FMT),-D__U32_LONG_FMT__,)
> +ifeq ($(TARGET_EFI),y)
> +COMMON_CFLAGS += $(EFI_CFLAGS)
> +else
>  COMMON_CFLAGS += $(fno_pic) $(no_pie)
> +endif
>  COMMON_CFLAGS += $(wclobbered)
>  COMMON_CFLAGS += $(wunused_but_set_parameter)
>  
> @@ -113,7 +140,7 @@ clean: arch_clean libfdt_clean
>  
>  distclean: clean
>  	$(RM) lib/asm lib/config.h config.mak $(TEST_DIR)-run msr.out cscope.* build-head
> -	$(RM) -r tests logs logs.old
> +	$(RM) -r tests logs logs.old efi-tests
>  
>  cscope: cscope_dirs = lib lib/libfdt lib/linux $(TEST_DIR) $(ARCH_LIBDIRS) lib/asm-generic
>  cscope:
> diff --git a/README.md b/README.md
> index b498aaf..6edacfe 100644
> --- a/README.md
> +++ b/README.md
> @@ -17,6 +17,8 @@ in this directory.  Test images are created in ./ARCH/\*.flat
>  
>  NOTE: GCC cross-compiler is required for [build on macOS](README.macOS.md).
>  
> +To build with UEFI, check [build and run with UEFI](./x86/efi/README.md).
> +
>  ## Standalone tests
>  
>  The tests can be built as standalone.  To create and use standalone tests do:
> @@ -54,6 +56,10 @@ ACCEL=name environment variable:
>  
>      ACCEL=kvm ./x86-run ./x86/msr.flat
>  
> +## Running the tests with UEFI
> +
> +Check [build and run with UEFI](./x86/efi/README.md).
> +
>  # Tests configuration file
>  
>  The test case may need specific runtime configurations, for
> diff --git a/configure b/configure
> index 1d4d855..b6c09b3 100755
> --- a/configure
> +++ b/configure
> @@ -28,6 +28,7 @@ erratatxt="$srcdir/errata.txt"
>  host_key_document=
>  page_size=
>  earlycon=
> +target_efi=
>  
>  usage() {
>      cat <<-EOF
> @@ -69,6 +70,7 @@ usage() {
>  	               pl011,mmio32,ADDR
>  	                           Specify a PL011 compatible UART at address ADDR. Supported
>  	                           register stride is 32 bit only.
> +	    --target-efi           Boot and run from UEFI
>  EOF
>      exit 1
>  }
> @@ -133,6 +135,9 @@ while [[ "$1" = -* ]]; do
>  	--earlycon)
>  	    earlycon="$arg"
>  	    ;;
> +	--target-efi)
> +	    target_efi=y
> +	    ;;
>  	--help)
>  	    usage
>  	    ;;
> @@ -341,6 +346,7 @@ U32_LONG_FMT=$u32_long
>  WA_DIVIDE=$wa_divide
>  GENPROTIMG=${GENPROTIMG-genprotimg}
>  HOST_KEY_DOCUMENT=$host_key_document
> +TARGET_EFI=$target_efi
>  EOF
>  if [ "$arch" = "arm" ] || [ "$arch" = "arm64" ]; then
>      echo "TARGET=$target" >> config.mak
> diff --git a/lib/efi.c b/lib/efi.c
> index 9711354..99307db 100644
> --- a/lib/efi.c
> +++ b/lib/efi.c
> @@ -1,6 +1,24 @@
> +/*
> + * efi_main() function to set up and run test cases in EFI
> + *
> + * Copyright (c) 2021, SUSE, Varad Gautam <varad.gautam@suse.com>
> + * Copyright (c) 2021, Google Inc, Zixuan Wang <zixuanwang@google.com>
> + *
> + * SPDX-License-Identifier: LGPL-2.0-or-later
> + */
> +
>  #include <linux/uefi.h>
> +#include <libcflat.h>
> +#include <asm/setup.h>
> +#include "efi.h"
> +
> +/* From lib/argv.c */
> +extern int __argc, __envc;
> +extern char *__argv[100];
> +extern char *__environ[200];
> +
> +extern int main(int argc, char **argv, char **envp);
>  
> -unsigned long __efiapi efi_main(efi_handle_t handle, efi_system_table_t *sys_tab);
>  efi_system_table_t *efi_system_table = NULL;
>  
>  static void efi_free_pool(void *ptr)
> @@ -8,7 +26,7 @@ static void efi_free_pool(void *ptr)
>  	efi_bs_call(free_pool, ptr);
>  }
>  
> -static efi_status_t efi_get_memory_map(struct efi_boot_memmap *map)
> +efi_status_t efi_get_memory_map(struct efi_boot_memmap *map)
>  {
>  	efi_memory_desc_t *m = NULL;
>  	efi_status_t status;
> @@ -44,15 +62,23 @@ out:
>  	return status;
>  }
>  
> -static efi_status_t efi_exit_boot_services(void *handle,
> -					   struct efi_boot_memmap *map)
> +efi_status_t efi_exit_boot_services(void *handle, struct efi_boot_memmap *map)
>  {
>  	return efi_bs_call(exit_boot_services, handle, *map->key_ptr);
>  }
>  
> -unsigned long __efiapi efi_main(efi_handle_t handle, efi_system_table_t *sys_tab)
> +efi_status_t efi_main(efi_handle_t handle, efi_system_table_t *sys_tab)
>  {
> +	int ret;
> +
>  	efi_system_table = sys_tab;
>  
> -	return 0;
> +	setup_efi();
> +	ret = main(__argc, __argv, __environ);

In my new AArch64 PoC I call an 'efi_setup' from 'start' in cstart64.S
and then when that returns 'main' is called like normal.

> +
> +	/* Shutdown the guest VM */
> +	efi_rs_call(reset_system, EFI_RESET_SHUTDOWN, ret, 0, NULL);
> +
> +	/* Unreachable */
> +	return EFI_UNSUPPORTED;
>  }
> diff --git a/lib/efi.h b/lib/efi.h
> new file mode 100644
> index 0000000..60cdb6f
> --- /dev/null
> +++ b/lib/efi.h
> @@ -0,0 +1,17 @@
> +#ifndef _EFI_H_
> +#define _EFI_H_
> +
> +/*
> + * EFI-related functions in KVM-Unit-Tests. This file's name "efi.h" is in
> + * conflict with GNU-EFI library's "efi.h", but KVM-Unit-Tests does not include
> + * GNU-EFI headers or links against GNU-EFI.
> + */
> +#include "linux/uefi.h"
> +#include <elf.h>
> +
> +efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t handle, efi_system_table_t *sys_tab);
> +efi_status_t efi_get_memory_map(struct efi_boot_memmap *map);
> +efi_status_t efi_exit_boot_services(void *handle, struct efi_boot_memmap *map);
> +efi_status_t efi_main(efi_handle_t handle, efi_system_table_t *sys_tab);
> +
> +#endif /* _EFI_H_ */
> diff --git a/lib/linux/uefi.h b/lib/linux/uefi.h
> index 567cddc..9adc7ab 100644
> --- a/lib/linux/uefi.h
> +++ b/lib/linux/uefi.h
> @@ -4,6 +4,12 @@
>  #ifndef __LINUX_UEFI_H
>  #define __LINUX_UEFI_H
>  
> +#include "libcflat.h"
> +
> +#ifndef __packed
> +# define __packed		__attribute__((__packed__))
> +#endif
> +
>  #define BITS_PER_LONG 64
>  
>  #define EFI_SUCCESS		0
> @@ -512,7 +518,7 @@ struct efi_boot_memmap {
>  	unsigned long           *buff_size;
>  };
>  
> -#define efi_bs_call(func, ...)						\
> -	efi_system_table->boottime->func(__VA_ARGS__)
> +#define efi_bs_call(func, ...) efi_system_table->boottime->func(__VA_ARGS__)
> +#define efi_rs_call(func, ...) efi_system_table->runtime->func(__VA_ARGS__)
>  
>  #endif /* __LINUX_UEFI_H */
> diff --git a/lib/x86/asm/setup.h b/lib/x86/asm/setup.h
> new file mode 100644
> index 0000000..eb1cf73
> --- /dev/null
> +++ b/lib/x86/asm/setup.h
> @@ -0,0 +1,11 @@
> +#ifndef _X86_ASM_SETUP_H_
> +#define _X86_ASM_SETUP_H_
> +
> +#ifdef TARGET_EFI
> +#include "x86/apic.h"
> +#include "x86/smp.h"
> +
> +void setup_efi(void);
> +#endif /* TARGET_EFI */
> +
> +#endif /* _X86_ASM_SETUP_H_ */
> diff --git a/lib/x86/setup.c b/lib/x86/setup.c
> index 7befe09..efb5ecd 100644
> --- a/lib/x86/setup.c
> +++ b/lib/x86/setup.c
> @@ -2,6 +2,7 @@
>   * Initialize machine setup information
>   *
>   * Copyright (C) 2017, Red Hat Inc, Andrew Jones <drjones@redhat.com>
> + * Copyright (C) 2021, Google Inc, Zixuan Wang <zixuanwang@google.com>
>   *
>   * This work is licensed under the terms of the GNU LGPL, version 2.
>   */
> @@ -9,6 +10,7 @@
>  #include "fwcfg.h"
>  #include "alloc_phys.h"
>  #include "argv.h"
> +#include "asm/setup.h"
>  
>  extern char edata;
>  
> @@ -118,6 +120,19 @@ void setup_multiboot(struct mbi_bootinfo *bi)
>  	initrd_size = mods->end - mods->start;
>  }
>  
> +#ifdef TARGET_EFI
> +
> +void setup_efi(void)
> +{
> +	reset_apic();
> +	mask_pic_interrupts();
> +	enable_apic();
> +	enable_x2apic();
> +	smp_init();
> +}
> +
> +#endif /* TARGET_EFI */
> +
>  void setup_libcflat(void)
>  {
>  	if (initrd) {
> diff --git a/x86/Makefile.common b/x86/Makefile.common
> index 52bb7aa..4859bf3 100644
> --- a/x86/Makefile.common
> +++ b/x86/Makefile.common
> @@ -22,6 +22,11 @@ cflatobjs += lib/x86/acpi.o
>  cflatobjs += lib/x86/stack.o
>  cflatobjs += lib/x86/fault_test.o
>  cflatobjs += lib/x86/delay.o
> +ifeq ($(TARGET_EFI),y)
> +cflatobjs += lib/x86/setup.o
> +cflatobjs += lib/efi.o
> +cflatobjs += x86/efi/reloc_x86_64.o
> +endif
>  
>  OBJDIRS += lib/x86
>  
> @@ -37,10 +42,25 @@ COMMON_CFLAGS += -O1
>  # stack.o relies on frame pointers.
>  KEEP_FRAME_POINTER := y
>  
> -# We want to keep intermediate file: %.elf and %.o 
> +FLATLIBS = lib/libcflat.a
> +
> +ifeq ($(TARGET_EFI),y)
> +.PRECIOUS: %.efi %.so
> +
> +%.so: %.o $(FLATLIBS) $(SRCDIR)/x86/efi/elf_x86_64_efi.lds $(cstart.o)
> +	$(LD) -T $(SRCDIR)/x86/efi/elf_x86_64_efi.lds $(EFI_LDFLAGS) -o $@ \
> +		$(filter %.o, $^) $(FLATLIBS)
> +	@chmod a-x $@
> +
> +%.efi: %.so
> +	$(OBJCOPY) \
> +		-j .text -j .sdata -j .data -j .dynamic -j .dynsym -j .rel \
> +		-j .rela -j .reloc -S --target=$(FORMAT) $< $@
> +	@chmod a-x $@
> +else
> +# We want to keep intermediate file: %.elf and %.o
>  .PRECIOUS: %.elf %.o
>  
> -FLATLIBS = lib/libcflat.a
>  %.elf: %.o $(FLATLIBS) $(SRCDIR)/x86/flat.lds $(cstart.o)
>  	$(CC) $(CFLAGS) -nostdlib -o $@ -Wl,-T,$(SRCDIR)/x86/flat.lds \
>  		$(filter %.o, $^) $(FLATLIBS)
> @@ -49,18 +69,29 @@ FLATLIBS = lib/libcflat.a
>  %.flat: %.elf
>  	$(OBJCOPY) -O elf32-i386 $^ $@
>  	@chmod a-x $@
> +endif
>  
> -tests-common = $(TEST_DIR)/vmexit.flat $(TEST_DIR)/tsc.flat \
> -               $(TEST_DIR)/smptest.flat  \
> -               $(TEST_DIR)/realmode.flat $(TEST_DIR)/msr.flat \
> -               $(TEST_DIR)/hypercall.flat $(TEST_DIR)/sieve.flat \
> -               $(TEST_DIR)/kvmclock_test.flat  $(TEST_DIR)/eventinj.flat \
> -               $(TEST_DIR)/s3.flat $(TEST_DIR)/pmu.flat $(TEST_DIR)/setjmp.flat \
> -               $(TEST_DIR)/tsc_adjust.flat $(TEST_DIR)/asyncpf.flat \
> -               $(TEST_DIR)/init.flat $(TEST_DIR)/smap.flat \
> -               $(TEST_DIR)/hyperv_synic.flat $(TEST_DIR)/hyperv_stimer.flat \
> -               $(TEST_DIR)/hyperv_connections.flat \
> -               $(TEST_DIR)/umip.flat $(TEST_DIR)/tsx-ctrl.flat
> +tests-common = $(TEST_DIR)/vmexit.$(exe) $(TEST_DIR)/tsc.$(exe) \
> +               $(TEST_DIR)/smptest.$(exe)  \
> +               $(TEST_DIR)/msr.$(exe) \
> +               $(TEST_DIR)/hypercall.$(exe) $(TEST_DIR)/sieve.$(exe) \
> +               $(TEST_DIR)/kvmclock_test.$(exe) \
> +               $(TEST_DIR)/s3.$(exe) $(TEST_DIR)/pmu.$(exe) $(TEST_DIR)/setjmp.$(exe) \
> +               $(TEST_DIR)/tsc_adjust.$(exe) $(TEST_DIR)/asyncpf.$(exe) \
> +               $(TEST_DIR)/init.$(exe) \
> +               $(TEST_DIR)/hyperv_synic.$(exe) $(TEST_DIR)/hyperv_stimer.$(exe) \
> +               $(TEST_DIR)/hyperv_connections.$(exe) \
> +               $(TEST_DIR)/tsx-ctrl.$(exe)
> +
> +# The following test cases are disabled when building EFI tests because they
> +# use absolute addresses in their inline assembly code, which cannot compile
> +# with the '-fPIC' flag
> +ifneq ($(TARGET_EFI),y)
> +tests-common += $(TEST_DIR)/eventinj.$(exe) \
> +                $(TEST_DIR)/smap.$(exe) \
> +                $(TEST_DIR)/realmode.$(exe) \
> +                $(TEST_DIR)/umip.$(exe)
> +endif
>  
>  test_cases: $(tests-common) $(tests)
>  
> @@ -72,14 +103,16 @@ $(TEST_DIR)/realmode.elf: $(TEST_DIR)/realmode.o
>  
>  $(TEST_DIR)/realmode.o: bits = $(if $(call cc-option,-m16,""),16,32)
>  
> -$(TEST_DIR)/kvmclock_test.elf: $(TEST_DIR)/kvmclock.o
> +$(TEST_DIR)/kvmclock_test.$(bin): $(TEST_DIR)/kvmclock.o
>  
> -$(TEST_DIR)/hyperv_synic.elf: $(TEST_DIR)/hyperv.o
> +$(TEST_DIR)/hyperv_synic.$(bin): $(TEST_DIR)/hyperv.o
>  
> -$(TEST_DIR)/hyperv_stimer.elf: $(TEST_DIR)/hyperv.o
> +$(TEST_DIR)/hyperv_stimer.$(bin): $(TEST_DIR)/hyperv.o
>  
> -$(TEST_DIR)/hyperv_connections.elf: $(TEST_DIR)/hyperv.o
> +$(TEST_DIR)/hyperv_connections.$(bin): $(TEST_DIR)/hyperv.o
>  
>  arch_clean:
>  	$(RM) $(TEST_DIR)/*.o $(TEST_DIR)/*.flat $(TEST_DIR)/*.elf \
>  	$(TEST_DIR)/.*.d lib/x86/.*.d \
> +	$(TEST_DIR)/efi/*.o $(TEST_DIR)/efi/.*.d \
> +	$(TEST_DIR)/*.so $(TEST_DIR)/*.efi
> diff --git a/x86/Makefile.i386 b/x86/Makefile.i386
> index 960e274..340c561 100644
> --- a/x86/Makefile.i386
> +++ b/x86/Makefile.i386
> @@ -1,11 +1,12 @@
>  cstart.o = $(TEST_DIR)/cstart.o
>  bits = 32
>  ldarch = elf32-i386
> +exe = flat
>  COMMON_CFLAGS += -mno-sse -mno-sse2
>  
>  cflatobjs += lib/x86/setjmp32.o lib/ldiv32.o
>  
> -tests = $(TEST_DIR)/taskswitch.flat $(TEST_DIR)/taskswitch2.flat \
> -	$(TEST_DIR)/cmpxchg8b.flat $(TEST_DIR)/la57.flat
> +tests = $(TEST_DIR)/taskswitch.$(exe) $(TEST_DIR)/taskswitch2.$(exe) \
> +	$(TEST_DIR)/cmpxchg8b.$(exe) $(TEST_DIR)/la57.$(exe)
>  
>  include $(SRCDIR)/$(TEST_DIR)/Makefile.common
> diff --git a/x86/Makefile.x86_64 b/x86/Makefile.x86_64
> index 8134952..a5f8923 100644
> --- a/x86/Makefile.x86_64
> +++ b/x86/Makefile.x86_64
> @@ -1,6 +1,15 @@
>  cstart.o = $(TEST_DIR)/cstart64.o
>  bits = 64
>  ldarch = elf64-x86-64
> +ifeq ($(TARGET_EFI),y)
> +exe = efi
> +bin = so
> +FORMAT = efi-app-x86_64
> +cstart.o = x86/efi/crt0-efi-x86_64.o
> +else
> +exe = flat
> +bin = elf
> +endif
>  
>  fcf_protection_full := $(call cc-option, -fcf-protection=full,)
>  COMMON_CFLAGS += -mno-red-zone -mno-sse -mno-sse2 $(fcf_protection_full)
> @@ -9,29 +18,36 @@ cflatobjs += lib/x86/setjmp64.o
>  cflatobjs += lib/x86/intel-iommu.o
>  cflatobjs += lib/x86/usermode.o
>  
> -tests = $(TEST_DIR)/access.flat $(TEST_DIR)/apic.flat \
> -	  $(TEST_DIR)/emulator.flat $(TEST_DIR)/idt_test.flat \
> -	  $(TEST_DIR)/xsave.flat $(TEST_DIR)/rmap_chain.flat \
> -	  $(TEST_DIR)/pcid.flat $(TEST_DIR)/debug.flat \
> -	  $(TEST_DIR)/ioapic.flat $(TEST_DIR)/memory.flat \
> -	  $(TEST_DIR)/pku.flat $(TEST_DIR)/hyperv_clock.flat
> -tests += $(TEST_DIR)/syscall.flat
> -tests += $(TEST_DIR)/svm.flat
> -tests += $(TEST_DIR)/vmx.flat
> -tests += $(TEST_DIR)/tscdeadline_latency.flat
> -tests += $(TEST_DIR)/intel-iommu.flat
> -tests += $(TEST_DIR)/vmware_backdoors.flat
> -tests += $(TEST_DIR)/rdpru.flat
> -tests += $(TEST_DIR)/pks.flat
> -tests += $(TEST_DIR)/pmu_lbr.flat
> +tests = $(TEST_DIR)/apic.$(exe) \
> +	  $(TEST_DIR)/idt_test.$(exe) \
> +	  $(TEST_DIR)/xsave.$(exe) $(TEST_DIR)/rmap_chain.$(exe) \
> +	  $(TEST_DIR)/pcid.$(exe) $(TEST_DIR)/debug.$(exe) \
> +	  $(TEST_DIR)/ioapic.$(exe) $(TEST_DIR)/memory.$(exe) \
> +	  $(TEST_DIR)/pku.$(exe) $(TEST_DIR)/hyperv_clock.$(exe)
> +tests += $(TEST_DIR)/syscall.$(exe)
> +tests += $(TEST_DIR)/tscdeadline_latency.$(exe)
> +tests += $(TEST_DIR)/intel-iommu.$(exe)
> +tests += $(TEST_DIR)/rdpru.$(exe)
> +tests += $(TEST_DIR)/pks.$(exe)
> +tests += $(TEST_DIR)/pmu_lbr.$(exe)
>  
> +# The following test cases are disabled when building EFI tests because they
> +# use absolute addresses in their inline assembly code, which cannot compile
> +# with the '-fPIC' flag
> +ifneq ($(TARGET_EFI),y)
> +tests += $(TEST_DIR)/access.$(exe)
> +tests += $(TEST_DIR)/emulator.$(exe)
> +tests += $(TEST_DIR)/svm.$(exe)
> +tests += $(TEST_DIR)/vmx.$(exe)
> +tests += $(TEST_DIR)/vmware_backdoors.$(exe)
>  ifneq ($(fcf_protection_full),)
> -tests += $(TEST_DIR)/cet.flat
> +tests += $(TEST_DIR)/cet.$(exe)
> +endif
>  endif
>  
>  include $(SRCDIR)/$(TEST_DIR)/Makefile.common
>  
> -$(TEST_DIR)/hyperv_clock.elf: $(TEST_DIR)/hyperv_clock.o
> +$(TEST_DIR)/hyperv_clock.$(bin): $(TEST_DIR)/hyperv_clock.o
>  
> -$(TEST_DIR)/vmx.elf: $(TEST_DIR)/vmx_tests.o
> -$(TEST_DIR)/svm.elf: $(TEST_DIR)/svm_tests.o
> +$(TEST_DIR)/vmx.$(bin): $(TEST_DIR)/vmx_tests.o
> +$(TEST_DIR)/svm.$(bin): $(TEST_DIR)/svm_tests.o
> diff --git a/x86/efi/README.md b/x86/efi/README.md
> index 256ef8c..befe9cc 100644
> --- a/x86/efi/README.md
> +++ b/x86/efi/README.md
> @@ -1,4 +1,38 @@
> -# EFI Startup Code and Linker Script
> +# Build KVM-Unit-Tests and run under UEFI
> +
> +## Introduction
> +
> +This dir provides code to build KVM-Unit-Tests test cases and run them under
> +QEMU and UEFI.
> +
> +### Install dependencies
> +
> +The following dependencies should be installed:
> +
> +- [UEFI firmware](https://github.com/tianocore/edk2): to run test cases in QEMU
> +
> +### Build
> +
> +To build:
> +
> +    ./configure --target-efi
> +    make
> +
> +### Run test cases with UEFI
> +
> +To run a test case with UEFI:
> +
> +    ./x86/efi/run ./x86/dummy.efi
> +
> +By default the runner script loads the UEFI firmware `/usr/share/ovmf/OVMF.fd`;
> +please install UEFI firmware to this path, or specify the correct path through
> +the env variable `EFI_UEFI`:
> +
> +    EFI_UEFI=/path/to/OVMF.fd ./x86/efi/run ./x86/dummy.efi
> +
> +## Code structure
> +
> +### Code from GNU-EFI
>  
>  This dir contains source code and linker script copied from
>  [GNU-EFI](https://sourceforge.net/projects/gnu-efi/):
> @@ -23,3 +57,7 @@ Relocatable Binaries".
>  
>  KVM-Unit-Tests follows a similar build process, but does not link with GNU-EFI
>  library.
> +### Startup code for KVM-Unit-Tests in UEFI
> +
> +This dir also contains KVM-Unit-Tests startup code in UEFI:
> +   - efistart64.S: startup code for KVM-Unit-Tests in UEFI
> diff --git a/x86/efi/reloc_x86_64.c b/x86/efi/reloc_x86_64.c
> index d13b53e..511ef82 100644
> --- a/x86/efi/reloc_x86_64.c
> +++ b/x86/efi/reloc_x86_64.c
> @@ -37,14 +37,11 @@
>      SUCH DAMAGE.
>  */
>  
> -#include <efi.h>
> -#include <efilib.h>
> -
> +#include "linux/uefi.h"
> +#include "efi.h"
>  #include <elf.h>
>  
> -EFI_STATUS _relocate (long ldbase, Elf64_Dyn *dyn,
> -		      EFI_HANDLE image EFI_UNUSED,
> -		      EFI_SYSTEM_TABLE *systab EFI_UNUSED)
> +efi_status_t _relocate(long ldbase, Elf64_Dyn *dyn, efi_handle_t handle, efi_system_table_t *sys_tab)

I think these conversions should be done as separate patches after the
import patches.

>  {
>  	long relsz = 0, relent = 0;
>  	Elf64_Rel *rel = 0;
> diff --git a/x86/efi/run b/x86/efi/run
> new file mode 100755
> index 0000000..72ad4a9
> --- /dev/null
> +++ b/x86/efi/run
> @@ -0,0 +1,63 @@
> +#!/bin/bash
> +
> +set -e
> +
> +if [ $# -eq 0 ]; then
> +	echo "Usage $0 TEST_CASE [QEMU_ARGS]"
> +	exit 2
> +fi
> +
> +if [ ! -f config.mak ]; then
> +	echo "run './configure --target-efi && make' first. See ./configure -h"
> +	exit 2
> +fi
> +source config.mak
> +
> +: "${EFI_SRC:=$(realpath "$(dirname "$0")/../")}"
> +: "${EFI_UEFI:=/usr/share/ovmf/OVMF.fd}"
> +: "${EFI_TEST:=efi-tests}"
> +: "${EFI_SMP:=1}"
> +: "${EFI_CASE:=$(basename $1 .efi)}"
> +
> +if [ ! -f "$EFI_UEFI" ]; then
> +	echo "UEFI firmware not found: $EFI_UEFI"
> +	echo "Please install the UEFI firmware to this path"
> +	echo "Or specify the correct path with the env variable EFI_UEFI"
> +	exit 2
> +fi
> +
> +# Remove the TEST_CASE from $@
> +shift 1
> +
> +# Prepare EFI boot file system
> +#   - Copy .efi file to host dir $EFI_TEST/$EFI_CASE/
> +#     This host dir will be loaded by QEMU as a FAT32 image
> +#   - Make UEFI startup script that runs the .efi on boot
> +mkdir -p "$EFI_TEST/$EFI_CASE/"
> +cp "$EFI_SRC/$EFI_CASE.efi" "$EFI_TEST/$EFI_CASE/"
> +
> +pushd "$EFI_TEST/$EFI_CASE" || exit 2
> +# 'startup.nsh' is the default script executed by UEFI on boot
> +# Use this script to run the test binary automatically
> +cat << EOF >startup.nsh
> +@echo -off
> +fs0:
> +"$EFI_CASE.efi"
> +EOF
> +popd || exit 2
> +
> +# Run test case with 256MiB QEMU memory. QEMU default memory size is 128MiB.
> +# After UEFI boot up and we call `LibMemoryMap()`, the largest consecutive
> +# memory region is ~42MiB. Although this is sufficient for many test cases to
> +# run in UEFI, some test cases, e.g. `x86/pmu.c`, require more free memory. A
> +# simple fix is to increase the QEMU default memory size to 256MiB so that
> +# UEFI's largest allocatable memory region is large enough.
> +EFI_RUN=y \
> +"$TEST_DIR/run" \
> +	-drive file="$EFI_UEFI",format=raw,if=pflash \

Also need the 'readonly' property on this drive.

> +	-drive file.dir="$EFI_TEST/$EFI_CASE/",file.driver=vvfat,file.rw=on,format=raw \
> +	-net none \
> +	-nographic \
> +	-smp "$EFI_SMP" \
> +	-m 256 \
> +	"$@"
> diff --git a/x86/run b/x86/run
> index 8b2425f..4eba2b9 100755
> --- a/x86/run
> +++ b/x86/run
> @@ -38,7 +38,19 @@ else
>  fi
>  
>  command="${qemu} --no-reboot -nodefaults $pc_testdev -vnc none -serial stdio $pci_testdev"
> -command+=" -machine accel=$ACCEL -kernel"
> +command+=" -machine accel=$ACCEL"
> +if ! [ "$EFI_RUN" ]; then
> +	command+=" -kernel"
> +fi
>  command="$(timeout_cmd) $command"
>  
> -run_qemu ${command} "$@"
> +if [ "$EFI_RUN" ]; then
> +	# Set ENVIRON_DEFAULT=n to remove '-initrd' flag for QEMU (see
> +	# 'scripts/arch-run.bash' for more details). This is because when using
> +	# UEFI, the test case binaries are passed to QEMU through the disk
> +	# image, not through the '-kernel' flag. And QEMU reports an error if it
> +	# gets '-initrd' without a '-kernel'
> +	ENVIRON_DEFAULT=n run_qemu ${command} "$@"
> +else
> +	run_qemu ${command} "$@"
> +fi
> -- 
> 2.33.0.259.gc128427fd7-goog
>

Thanks,
drew