Message-ID: <87pnfeflgb.fsf@vitty.brq.redhat.com>
Date:   Mon, 20 Jan 2020 11:53:24 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Eric Auger <eric.auger@...hat.com>
Cc:     thuth@...hat.com, drjones@...hat.com, eric.auger.pro@...il.com,
        eric.auger@...hat.com, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, pbonzini@...hat.comw
Subject: Re: [PATCH] selftests: KVM: AMD Nested SVM test infrastructure

Eric Auger <eric.auger@...hat.com> writes:

> Add the basic infrastructure needed to test AMD nested SVM.
> This is largely copied from the KVM unit test infrastructure.
> Three very basic tests come along, executed in sequence.
>
> Signed-off-by: Eric Auger <eric.auger@...hat.com>

Thanks a lot for doing this!

>
> ---
>
> Given the amount of code taken from KVM unit test, I would be
> more than happy to transfer any authorship. Please let me know.

Oh come on, AMD and Intel are borrowing each other ideas and I'm yet to
see 'This feature was inspired by the competitor's ...' in either of the
SDMs :-))

> ---
>  tools/testing/selftests/kvm/Makefile          |   3 +-
>  .../selftests/kvm/include/x86_64/svm.h        | 390 ++++++++++++++++++
>  tools/testing/selftests/kvm/lib/x86_64/svm.c  | 211 ++++++++++
>  tools/testing/selftests/kvm/x86_64/svm_test.c | 127 ++++++

I'd suggest to split this into two patches: infra and the new
test. Infra can probably also be split.

>  4 files changed, 730 insertions(+), 1 deletion(-)
>  create mode 100644 tools/testing/selftests/kvm/include/x86_64/svm.h
>  create mode 100644 tools/testing/selftests/kvm/lib/x86_64/svm.c
>  create mode 100644 tools/testing/selftests/kvm/x86_64/svm_test.c
>
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index 3138a916574a..ea2f8bcf729e 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -8,7 +8,7 @@ KSFT_KHDR_INSTALL := 1
>  UNAME_M := $(shell uname -m)
>  
>  LIBKVM = lib/assert.c lib/elf.c lib/io.c lib/kvm_util.c lib/sparsebit.c
> -LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/ucall.c
> +LIBKVM_x86_64 = lib/x86_64/processor.c lib/x86_64/vmx.c lib/x86_64/svm.c lib/x86_64/ucall.c
>  LIBKVM_aarch64 = lib/aarch64/processor.c lib/aarch64/ucall.c
>  LIBKVM_s390x = lib/s390x/processor.c lib/s390x/ucall.c
>  
> @@ -26,6 +26,7 @@ TEST_GEN_PROGS_x86_64 += x86_64/vmx_dirty_log_test
>  TEST_GEN_PROGS_x86_64 += x86_64/vmx_set_nested_state_test
>  TEST_GEN_PROGS_x86_64 += x86_64/vmx_tsc_adjust_test
>  TEST_GEN_PROGS_x86_64 += x86_64/xss_msr_test
> +TEST_GEN_PROGS_x86_64 += x86_64/svm_test
>  TEST_GEN_PROGS_x86_64 += clear_dirty_log_test
>  TEST_GEN_PROGS_x86_64 += dirty_log_test
>  TEST_GEN_PROGS_x86_64 += kvm_create_max_vcpus
> diff --git a/tools/testing/selftests/kvm/include/x86_64/svm.h b/tools/testing/selftests/kvm/include/x86_64/svm.h
> new file mode 100644
> index 000000000000..12c23961f73a
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/include/x86_64/svm.h
> @@ -0,0 +1,390 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * tools/testing/selftests/kvm/include/x86_64/svm.h
> + * Header for nested SVM testing
> + * Largely copied from KVM unit test svm.h
> + *
> + * Copyright (C) 2020, Red Hat, Inc.
> + */
> +
> +#ifndef SELFTEST_KVM_SVM_H
> +#define SELFTEST_KVM_SVM_H
> +
> +#include <stdint.h>
> +#include "processor.h"
> +
> +#define CPUID_SVM_BIT		2
> +#define CPUID_SVM		(1 << 2)

BIT_ULL(CPUID_SVM_BIT) ?

> +
> +enum {
> +	INTERCEPT_INTR,
> +	INTERCEPT_NMI,
> +	INTERCEPT_SMI,
> +	INTERCEPT_INIT,
> +	INTERCEPT_VINTR,
> +	INTERCEPT_SELECTIVE_CR0,
> +	INTERCEPT_STORE_IDTR,
> +	INTERCEPT_STORE_GDTR,
> +	INTERCEPT_STORE_LDTR,
> +	INTERCEPT_STORE_TR,
> +	INTERCEPT_LOAD_IDTR,
> +	INTERCEPT_LOAD_GDTR,
> +	INTERCEPT_LOAD_LDTR,
> +	INTERCEPT_LOAD_TR,
> +	INTERCEPT_RDTSC,
> +	INTERCEPT_RDPMC,
> +	INTERCEPT_PUSHF,
> +	INTERCEPT_POPF,
> +	INTERCEPT_CPUID,
> +	INTERCEPT_RSM,
> +	INTERCEPT_IRET,
> +	INTERCEPT_INTn,
> +	INTERCEPT_INVD,
> +	INTERCEPT_PAUSE,
> +	INTERCEPT_HLT,
> +	INTERCEPT_INVLPG,
> +	INTERCEPT_INVLPGA,
> +	INTERCEPT_IOIO_PROT,
> +	INTERCEPT_MSR_PROT,
> +	INTERCEPT_TASK_SWITCH,
> +	INTERCEPT_FERR_FREEZE,
> +	INTERCEPT_SHUTDOWN,
> +	INTERCEPT_VMRUN,
> +	INTERCEPT_VMMCALL,
> +	INTERCEPT_VMLOAD,
> +	INTERCEPT_VMSAVE,
> +	INTERCEPT_STGI,
> +	INTERCEPT_CLGI,
> +	INTERCEPT_SKINIT,
> +	INTERCEPT_RDTSCP,
> +	INTERCEPT_ICEBP,
> +	INTERCEPT_WBINVD,
> +	INTERCEPT_MONITOR,
> +	INTERCEPT_MWAIT,
> +	INTERCEPT_MWAIT_COND,
> +};
> +
> +struct __attribute__ ((__packed__)) vmcb_control_area {
> +	u16 intercept_cr_read;
> +	u16 intercept_cr_write;
> +	u16 intercept_dr_read;
> +	u16 intercept_dr_write;
> +	u32 intercept_exceptions;
> +	u64 intercept;
> +	u8 reserved_1[42];
> +	u16 pause_filter_count;
> +	u64 iopm_base_pa;
> +	u64 msrpm_base_pa;
> +	u64 tsc_offset;
> +	u32 asid;
> +	u8 tlb_ctl;
> +	u8 reserved_2[3];
> +	u32 int_ctl;
> +	u32 int_vector;
> +	u32 int_state;
> +	u8 reserved_3[4];
> +	u32 exit_code;
> +	u32 exit_code_hi;
> +	u64 exit_info_1;
> +	u64 exit_info_2;
> +	u32 exit_int_info;
> +	u32 exit_int_info_err;
> +	u64 nested_ctl;
> +	u8 reserved_4[16];
> +	u32 event_inj;
> +	u32 event_inj_err;
> +	u64 nested_cr3;
> +	u64 lbr_ctl;
> +	u64 reserved_5;
> +	u64 next_rip;
> +	u8 reserved_6[816];
> +};
> +
> +struct regs {
> +	u64 rax;
> +	u64 rbx;
> +	u64 rcx;
> +	u64 rdx;
> +	u64 cr2;
> +	u64 rbp;
> +	u64 rsi;
> +	u64 rdi;
> +	u64 r8;
> +	u64 r9;
> +	u64 r10;
> +	u64 r11;
> +	u64 r12;
> +	u64 r13;
> +	u64 r14;
> +	u64 r15;
> +	u64 rflags;
> +};

This structure is not svm specific, I'd suggest to move it to a common
header ('x86_gp_regs'?)

> +
> +#define TLB_CONTROL_DO_NOTHING 0
> +#define TLB_CONTROL_FLUSH_ALL_ASID 1
> +
> +#define V_TPR_MASK 0x0f
> +
> +#define V_IRQ_SHIFT 8
> +#define V_IRQ_MASK (1 << V_IRQ_SHIFT)
> +
> +#define V_INTR_PRIO_SHIFT 16
> +#define V_INTR_PRIO_MASK (0x0f << V_INTR_PRIO_SHIFT)
> +
> +#define V_IGN_TPR_SHIFT 20
> +#define V_IGN_TPR_MASK (1 << V_IGN_TPR_SHIFT)
> +
> +#define V_INTR_MASKING_SHIFT 24
> +#define V_INTR_MASKING_MASK (1 << V_INTR_MASKING_SHIFT)
> +
> +#define SVM_INTERRUPT_SHADOW_MASK 1
> +
> +#define SVM_IOIO_STR_SHIFT 2
> +#define SVM_IOIO_REP_SHIFT 3
> +#define SVM_IOIO_SIZE_SHIFT 4
> +#define SVM_IOIO_ASIZE_SHIFT 7
> +
> +#define SVM_IOIO_TYPE_MASK 1
> +#define SVM_IOIO_STR_MASK (1 << SVM_IOIO_STR_SHIFT)
> +#define SVM_IOIO_REP_MASK (1 << SVM_IOIO_REP_SHIFT)
> +#define SVM_IOIO_SIZE_MASK (7 << SVM_IOIO_SIZE_SHIFT)
> +#define SVM_IOIO_ASIZE_MASK (7 << SVM_IOIO_ASIZE_SHIFT)
> +
> +#define SVM_VM_CR_VALID_MASK	0x001fULL
> +#define SVM_VM_CR_SVM_LOCK_MASK 0x0008ULL
> +#define SVM_VM_CR_SVM_DIS_MASK  0x0010ULL
> +
> +struct __attribute__ ((__packed__)) vmcb_seg {
> +	u16 selector;
> +	u16 attrib;
> +	u32 limit;
> +	u64 base;
> +};
> +
> +struct __attribute__ ((__packed__)) vmcb_save_area {
> +	struct vmcb_seg es;
> +	struct vmcb_seg cs;
> +	struct vmcb_seg ss;
> +	struct vmcb_seg ds;
> +	struct vmcb_seg fs;
> +	struct vmcb_seg gs;
> +	struct vmcb_seg gdtr;
> +	struct vmcb_seg ldtr;
> +	struct vmcb_seg idtr;
> +	struct vmcb_seg tr;
> +	u8 reserved_1[43];
> +	u8 cpl;
> +	u8 reserved_2[4];
> +	u64 efer;
> +	u8 reserved_3[112];
> +	u64 cr4;
> +	u64 cr3;
> +	u64 cr0;
> +	u64 dr7;
> +	u64 dr6;
> +	u64 rflags;
> +	u64 rip;
> +	u8 reserved_4[88];
> +	u64 rsp;
> +	u8 reserved_5[24];
> +	u64 rax;
> +	u64 star;
> +	u64 lstar;
> +	u64 cstar;
> +	u64 sfmask;
> +	u64 kernel_gs_base;
> +	u64 sysenter_cs;
> +	u64 sysenter_esp;
> +	u64 sysenter_eip;
> +	u64 cr2;
> +	u8 reserved_6[32];
> +	u64 g_pat;
> +	u64 dbgctl;
> +	u64 br_from;
> +	u64 br_to;
> +	u64 last_excp_from;
> +	u64 last_excp_to;
> +};
> +
> +struct __attribute__ ((__packed__)) vmcb {
> +	struct vmcb_control_area control;
> +	struct vmcb_save_area save;
> +};
> +
> +#define SVM_CPUID_FEATURE_SHIFT 2
> +#define SVM_CPUID_FUNC 0x8000000a
> +
> +#define SVM_VM_CR_SVM_DISABLE 4
> +
> +#define SVM_SELECTOR_S_SHIFT 4
> +#define SVM_SELECTOR_DPL_SHIFT 5
> +#define SVM_SELECTOR_P_SHIFT 7
> +#define SVM_SELECTOR_AVL_SHIFT 8
> +#define SVM_SELECTOR_L_SHIFT 9
> +#define SVM_SELECTOR_DB_SHIFT 10
> +#define SVM_SELECTOR_G_SHIFT 11
> +
> +#define SVM_SELECTOR_TYPE_MASK (0xf)
> +#define SVM_SELECTOR_S_MASK (1 << SVM_SELECTOR_S_SHIFT)
> +#define SVM_SELECTOR_DPL_MASK (3 << SVM_SELECTOR_DPL_SHIFT)
> +#define SVM_SELECTOR_P_MASK (1 << SVM_SELECTOR_P_SHIFT)
> +#define SVM_SELECTOR_AVL_MASK (1 << SVM_SELECTOR_AVL_SHIFT)
> +#define SVM_SELECTOR_L_MASK (1 << SVM_SELECTOR_L_SHIFT)
> +#define SVM_SELECTOR_DB_MASK (1 << SVM_SELECTOR_DB_SHIFT)
> +#define SVM_SELECTOR_G_MASK (1 << SVM_SELECTOR_G_SHIFT)
> +
> +#define SVM_SELECTOR_WRITE_MASK (1 << 1)
> +#define SVM_SELECTOR_READ_MASK SVM_SELECTOR_WRITE_MASK
> +#define SVM_SELECTOR_CODE_MASK (1 << 3)
> +
> +#define INTERCEPT_CR0_MASK 1
> +#define INTERCEPT_CR3_MASK (1 << 3)
> +#define INTERCEPT_CR4_MASK (1 << 4)
> +#define INTERCEPT_CR8_MASK (1 << 8)
> +
> +#define INTERCEPT_DR0_MASK 1
> +#define INTERCEPT_DR1_MASK (1 << 1)
> +#define INTERCEPT_DR2_MASK (1 << 2)
> +#define INTERCEPT_DR3_MASK (1 << 3)
> +#define INTERCEPT_DR4_MASK (1 << 4)
> +#define INTERCEPT_DR5_MASK (1 << 5)
> +#define INTERCEPT_DR6_MASK (1 << 6)
> +#define INTERCEPT_DR7_MASK (1 << 7)
> +
> +#define SVM_EVTINJ_VEC_MASK 0xff
> +
> +#define SVM_EVTINJ_TYPE_SHIFT 8
> +#define SVM_EVTINJ_TYPE_MASK (7 << SVM_EVTINJ_TYPE_SHIFT)
> +
> +#define SVM_EVTINJ_TYPE_INTR (0 << SVM_EVTINJ_TYPE_SHIFT)
> +#define SVM_EVTINJ_TYPE_NMI (2 << SVM_EVTINJ_TYPE_SHIFT)
> +#define SVM_EVTINJ_TYPE_EXEPT (3 << SVM_EVTINJ_TYPE_SHIFT)
> +#define SVM_EVTINJ_TYPE_SOFT (4 << SVM_EVTINJ_TYPE_SHIFT)
> +
> +#define SVM_EVTINJ_VALID (1 << 31)
> +#define SVM_EVTINJ_VALID_ERR (1 << 11)
> +
> +#define SVM_EXITINTINFO_VEC_MASK SVM_EVTINJ_VEC_MASK
> +#define SVM_EXITINTINFO_TYPE_MASK SVM_EVTINJ_TYPE_MASK
> +
> +#define	SVM_EXITINTINFO_TYPE_INTR SVM_EVTINJ_TYPE_INTR
> +#define	SVM_EXITINTINFO_TYPE_NMI SVM_EVTINJ_TYPE_NMI
> +#define	SVM_EXITINTINFO_TYPE_EXEPT SVM_EVTINJ_TYPE_EXEPT
> +#define	SVM_EXITINTINFO_TYPE_SOFT SVM_EVTINJ_TYPE_SOFT
> +
> +#define SVM_EXITINTINFO_VALID SVM_EVTINJ_VALID
> +#define SVM_EXITINTINFO_VALID_ERR SVM_EVTINJ_VALID_ERR
> +
> +#define SVM_EXITINFOSHIFT_TS_REASON_IRET 36
> +#define SVM_EXITINFOSHIFT_TS_REASON_JMP 38
> +#define SVM_EXITINFOSHIFT_TS_HAS_ERROR_CODE 44
> +
> +#define	SVM_EXIT_READ_CR0	0x000
> +#define	SVM_EXIT_READ_CR3	0x003
> +#define	SVM_EXIT_READ_CR4	0x004
> +#define	SVM_EXIT_READ_CR8	0x008
> +#define	SVM_EXIT_WRITE_CR0	0x010
> +#define	SVM_EXIT_WRITE_CR3	0x013
> +#define	SVM_EXIT_WRITE_CR4	0x014
> +#define	SVM_EXIT_WRITE_CR8	0x018
> +#define	SVM_EXIT_READ_DR0	0x020
> +#define	SVM_EXIT_READ_DR1	0x021
> +#define	SVM_EXIT_READ_DR2	0x022
> +#define	SVM_EXIT_READ_DR3	0x023
> +#define	SVM_EXIT_READ_DR4	0x024
> +#define	SVM_EXIT_READ_DR5	0x025
> +#define	SVM_EXIT_READ_DR6	0x026
> +#define	SVM_EXIT_READ_DR7	0x027
> +#define	SVM_EXIT_WRITE_DR0	0x030
> +#define	SVM_EXIT_WRITE_DR1	0x031
> +#define	SVM_EXIT_WRITE_DR2	0x032
> +#define	SVM_EXIT_WRITE_DR3	0x033
> +#define	SVM_EXIT_WRITE_DR4	0x034
> +#define	SVM_EXIT_WRITE_DR5	0x035
> +#define	SVM_EXIT_WRITE_DR6	0x036
> +#define	SVM_EXIT_WRITE_DR7	0x037
> +#define SVM_EXIT_EXCP_BASE      0x040
> +#define SVM_EXIT_INTR		0x060
> +#define SVM_EXIT_NMI		0x061
> +#define SVM_EXIT_SMI		0x062
> +#define SVM_EXIT_INIT		0x063
> +#define SVM_EXIT_VINTR		0x064
> +#define SVM_EXIT_CR0_SEL_WRITE	0x065
> +#define SVM_EXIT_IDTR_READ	0x066
> +#define SVM_EXIT_GDTR_READ	0x067
> +#define SVM_EXIT_LDTR_READ	0x068
> +#define SVM_EXIT_TR_READ	0x069
> +#define SVM_EXIT_IDTR_WRITE	0x06a
> +#define SVM_EXIT_GDTR_WRITE	0x06b
> +#define SVM_EXIT_LDTR_WRITE	0x06c
> +#define SVM_EXIT_TR_WRITE	0x06d
> +#define SVM_EXIT_RDTSC		0x06e
> +#define SVM_EXIT_RDPMC		0x06f
> +#define SVM_EXIT_PUSHF		0x070
> +#define SVM_EXIT_POPF		0x071
> +#define SVM_EXIT_CPUID		0x072
> +#define SVM_EXIT_RSM		0x073
> +#define SVM_EXIT_IRET		0x074
> +#define SVM_EXIT_SWINT		0x075
> +#define SVM_EXIT_INVD		0x076
> +#define SVM_EXIT_PAUSE		0x077
> +#define SVM_EXIT_HLT		0x078
> +#define SVM_EXIT_INVLPG		0x079
> +#define SVM_EXIT_INVLPGA	0x07a
> +#define SVM_EXIT_IOIO		0x07b
> +#define SVM_EXIT_MSR		0x07c
> +#define SVM_EXIT_TASK_SWITCH	0x07d
> +#define SVM_EXIT_FERR_FREEZE	0x07e
> +#define SVM_EXIT_SHUTDOWN	0x07f
> +#define SVM_EXIT_VMRUN		0x080
> +#define SVM_EXIT_VMMCALL	0x081
> +#define SVM_EXIT_VMLOAD		0x082
> +#define SVM_EXIT_VMSAVE		0x083
> +#define SVM_EXIT_STGI		0x084
> +#define SVM_EXIT_CLGI		0x085
> +#define SVM_EXIT_SKINIT		0x086
> +#define SVM_EXIT_RDTSCP		0x087
> +#define SVM_EXIT_ICEBP		0x088
> +#define SVM_EXIT_WBINVD		0x089
> +#define SVM_EXIT_MONITOR	0x08a
> +#define SVM_EXIT_MWAIT		0x08b
> +#define SVM_EXIT_MWAIT_COND	0x08c
> +#define SVM_EXIT_NPF		0x400
> +
> +#define SVM_EXIT_ERR		-1
> +
> +#define SVM_CR0_SELECTIVE_MASK (X86_CR0_TS | X86_CR0_MP)
> +
> +struct svm_test_data;
> +
> +struct test {
> +	const char *name;
> +	bool (*supported)(void);
> +	void (*l1_custom_setup)(struct svm_test_data *svm);
> +	void (*l2_guest_code)(struct svm_test_data *svm);
> +	int expected_exit_code;
> +	bool (*l1_check_result)(struct svm_test_data *svm);
> +	bool (*finished)(struct svm_test_data *svm);
> +	ulong scratch;
> +};
> +
> +struct svm_test_data {
> +	void *vmcb_hva;
> +	uint64_t vmcb_gpa;
> +	struct vmcb *vmcb;
> +
> +	void *save_area_hva;
> +	uint64_t save_area_gpa;
> +	struct vmcb_save_area *save_area;
> +
> +	struct test *test;
> +};
> +
> +extern struct regs regs;
> +
> +struct svm_test_data *vcpu_alloc_svm(struct kvm_vm *vm, vm_vaddr_t *p_svm_gva);
> +void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_rsp);
> +void run_guest(struct vmcb *vmcb, uint64_t vmcb_gpa);
> +void nested_svm_check_supported(void);
> +
> +#endif /* SELFTEST_KVM_SVM_H */
> diff --git a/tools/testing/selftests/kvm/lib/x86_64/svm.c b/tools/testing/selftests/kvm/lib/x86_64/svm.c
> new file mode 100644
> index 000000000000..acb04ca4e757
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/lib/x86_64/svm.c
> @@ -0,0 +1,211 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * tools/testing/selftests/kvm/lib/x86_64/svm.c
> + * Helpers used for nested SVM testing
> + * Largely inspired from KVM unit test svm.c
> + *
> + * Copyright (C) 2020, Red Hat, Inc.
> + */
> +
> +#include "test_util.h"
> +#include "kvm_util.h"
> +#include "../kvm_util_internal.h"
> +#include "processor.h"
> +#include "svm.h"
> +
> +struct regs regs;
> +
> +/* Allocate memory regions for nested SVM tests.
> + *
> + * Input Args:
> + *   vm - The VM to allocate guest-virtual addresses in.
> + *
> + * Output Args:
> + *   p_svm_gva - The guest virtual address for the struct svm_test_data.
> + *
> + * Return:
> + *   Pointer to structure with the addresses of the SVM areas.
> + */
> +struct svm_test_data *
> +vcpu_alloc_svm(struct kvm_vm *vm, vm_vaddr_t *p_svm_gva)
> +{
> +	vm_vaddr_t svm_gva = vm_vaddr_alloc(vm, getpagesize(),
> +					    0x10000, 0, 0);
> +	struct svm_test_data *svm = addr_gva2hva(vm, svm_gva);
> +
> +	svm->vmcb = (void *)vm_vaddr_alloc(vm, getpagesize(),
> +					   0x10000, 0, 0);
> +	svm->vmcb_hva = addr_gva2hva(vm, (uintptr_t)svm->vmcb);
> +	svm->vmcb_gpa = addr_gva2gpa(vm, (uintptr_t)svm->vmcb);
> +
> +	svm->save_area = (void *)vm_vaddr_alloc(vm, getpagesize(),
> +						0x10000, 0, 0);
> +	svm->save_area_hva = addr_gva2hva(vm, (uintptr_t)svm->save_area);
> +	svm->save_area_gpa = addr_gva2gpa(vm, (uintptr_t)svm->save_area);
> +
> +	*p_svm_gva = svm_gva;
> +	return svm;
> +}
> +
> +struct descriptor_table_ptr {
> +	u16 limit;
> +	ulong base;
> +} __attribute__((packed));
> +
> +static inline void sgdt(struct descriptor_table_ptr *ptr)
> +{
> +	asm volatile ("sgdt %0" : "=m"(*ptr));
> +}
> +
> +static inline void sidt(struct descriptor_table_ptr *ptr)
> +{
> +	asm volatile ("sidt %0" : "=m"(*ptr));
> +}
> +
> +static void vmcb_set_seg(struct vmcb_seg *seg, u16 selector,
> +			 u64 base, u32 limit, u32 attr)
> +{
> +	seg->selector = selector;
> +	seg->attrib = attr;
> +	seg->limit = limit;
> +	seg->base = base;
> +}
> +
> +static inline u16 read_cs(void)
> +{
> +	u16 val;
> +
> +	asm volatile ("mov %%cs, %0" : "=mr"(val));
> +	return val;
> +}
> +
> +static inline u16 read_ds(void)
> +{
> +	u16 val;
> +
> +	asm volatile ("mov %%ds, %0" : "=mr"(val));
> +	return val;
> +}
> +
> +static inline u16 read_es(void)
> +{
> +	u16 val;
> +
> +	asm volatile ("mov %%es, %0" : "=mr"(val));
> +	return val;
> +}
> +
> +static inline u16 read_ss(void)
> +{
> +	unsigned int val;
> +
> +	asm volatile ("mov %%ss, %0" : "=mr"(val));
> +	return val;
> +}
> +
> +void generic_svm_setup(struct svm_test_data *svm, void *guest_rip, void *guest_rsp)
> +{
> +	struct vmcb *vmcb = svm->vmcb;
> +	uint64_t vmcb_gpa = svm->vmcb_gpa;
> +	struct vmcb_save_area *save = &vmcb->save;
> +	struct vmcb_control_area *ctrl = &vmcb->control;
> +	u32 data_seg_attr = 3 | SVM_SELECTOR_S_MASK | SVM_SELECTOR_P_MASK
> +	      | SVM_SELECTOR_DB_MASK | SVM_SELECTOR_G_MASK;
> +	u32 code_seg_attr = 9 | SVM_SELECTOR_S_MASK | SVM_SELECTOR_P_MASK
> +		| SVM_SELECTOR_L_MASK | SVM_SELECTOR_G_MASK;
> +	struct descriptor_table_ptr desc_table_ptr;
> +	uint64_t efer;
> +
> +	efer = rdmsr(MSR_EFER);
> +	wrmsr(MSR_EFER, efer | EFER_SVME);
> +	wrmsr(MSR_VM_HSAVE_PA, svm->save_area_gpa);
> +
> +	memset(vmcb, 0, sizeof(*vmcb));
> +	asm volatile ("vmsave %0" : : "a" (vmcb_gpa) : "memory");
> +	vmcb_set_seg(&save->es, read_es(), 0, -1U, data_seg_attr);
> +	vmcb_set_seg(&save->cs, read_cs(), 0, -1U, code_seg_attr);
> +	vmcb_set_seg(&save->ss, read_ss(), 0, -1U, data_seg_attr);
> +	vmcb_set_seg(&save->ds, read_ds(), 0, -1U, data_seg_attr);
> +	sgdt(&desc_table_ptr);
> +	vmcb_set_seg(&save->gdtr, 0,
> +		     desc_table_ptr.base, desc_table_ptr.limit, 0);
> +	sidt(&desc_table_ptr);
> +	vmcb_set_seg(&save->idtr, 0,
> +		     desc_table_ptr.base, desc_table_ptr.limit, 0);
> +
> +	ctrl->asid = 1;
> +	save->cpl = 0;
> +	save->efer = rdmsr(MSR_EFER);
> +	asm volatile ("mov %%cr4, %0" : "=r"(save->cr4) : : "memory");
> +	asm volatile ("mov %%cr3, %0" : "=r"(save->cr3) : : "memory");
> +	asm volatile ("mov %%cr0, %0" : "=r"(save->cr0) : : "memory");
> +	asm volatile ("mov %%dr7, %0" : "=r"(save->dr7));
> +	asm volatile ("mov %%dr6, %0" : "=r"(save->dr6));
> +	asm volatile ("mov %%cr2, %0" : "=r"(save->cr2) : : "memory");
> +	save->g_pat = rdmsr(MSR_IA32_CR_PAT);
> +	save->dbgctl = rdmsr(MSR_IA32_DEBUGCTLMSR);
> +	ctrl->intercept = (1ULL << INTERCEPT_VMRUN) |
> +				(1ULL << INTERCEPT_VMMCALL);
> +
> +	vmcb->save.rip = (ulong)guest_rip;
> +	vmcb->save.rsp = (ulong)guest_rsp;
> +	regs.rdi = (ulong)svm;
> +}
> +
> +#define SAVE_GPR_C                              \
> +	"xchg %%rbx, regs+0x8\n\t"              \
> +	"xchg %%rcx, regs+0x10\n\t"             \
> +	"xchg %%rdx, regs+0x18\n\t"             \
> +	"xchg %%rbp, regs+0x28\n\t"             \
> +	"xchg %%rsi, regs+0x30\n\t"             \
> +	"xchg %%rdi, regs+0x38\n\t"             \
> +	"xchg %%r8, regs+0x40\n\t"              \
> +	"xchg %%r9, regs+0x48\n\t"              \
> +	"xchg %%r10, regs+0x50\n\t"             \
> +	"xchg %%r11, regs+0x58\n\t"             \
> +	"xchg %%r12, regs+0x60\n\t"             \
> +	"xchg %%r13, regs+0x68\n\t"             \
> +	"xchg %%r14, regs+0x70\n\t"             \
> +	"xchg %%r15, regs+0x78\n\t"
> +
> +#define LOAD_GPR_C      SAVE_GPR_C
> +
> +/*
> + * selftests do not use interrupts so we dropped clgi/sti/cli/stgi
> + * for now
> + */
> +void run_guest(struct vmcb *vmcb, uint64_t vmcb_gpa)
> +{
> +	asm volatile (
> +		"vmload\n\t"
> +		"vmload %[vmcb_gpa]\n\t"
> +		"mov regs+0x80, %%r15\n\t"  // rflags
> +		"mov %%r15, 0x170(%[vmcb])\n\t"
> +		"mov regs, %%r15\n\t"       // rax
> +		"mov %%r15, 0x1f8(%[vmcb])\n\t"
> +		LOAD_GPR_C
> +		"vmrun %[vmcb_gpa]\n\t"
> +		SAVE_GPR_C
> +		"mov 0x170(%[vmcb]), %%r15\n\t"  // rflags
> +		"mov %%r15, regs+0x80\n\t"
> +		"mov 0x1f8(%[vmcb]), %%r15\n\t"  // rax
> +		"mov %%r15, regs\n\t"
> +		"vmsave %[vmcb_gpa]\n\t"
> +		: : [vmcb] "r" (vmcb), [vmcb_gpa] "r" (vmcb_gpa)
> +		: "rbx", "rcx", "rdx", "rsi",
> +		  "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
> +		  "memory");
> +
> +}
> +
> +void nested_svm_check_supported(void)
> +{
> +	struct kvm_cpuid_entry2 *entry =
> +		kvm_get_supported_cpuid_entry(0x80000001);
> +
> +	if (!(entry->ecx & CPUID_SVM)) {
> +		fprintf(stderr, "nested SVM not enabled, skipping test\n");
> +		exit(KSFT_SKIP);
> +	}
> +}
> +
> diff --git a/tools/testing/selftests/kvm/x86_64/svm_test.c b/tools/testing/selftests/kvm/x86_64/svm_test.c
> new file mode 100644
> index 000000000000..d46af36d5aae
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/x86_64/svm_test.c
> @@ -0,0 +1,127 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * svm_test
> + *
> + * Copyright (C) 2020, Red Hat, Inc.
> + *
> + * Nested SVM testing
> + *
> + * The main executes several nested SVM tests
> + */
> +
> +#include "test_util.h"
> +#include "kvm_util.h"
> +#include "processor.h"
> +#include "svm.h"
> +
> +#include <string.h>
> +#include <sys/ioctl.h>
> +
> +#include "kselftest.h"
> +#include <linux/kernel.h>
> +
> +#define VCPU_ID		5
> +
> +/* The virtual machine object. */
> +static struct kvm_vm *vm;
> +
> +static void l2_vmcall(struct svm_test_data *svm)
> +{
> +	__asm__ __volatile__("vmcall");
> +}
> +
> +static void l2_vmrun(struct svm_test_data *svm)
> +{
> +	__asm__ __volatile__("vmrun");
> +}
> +
> +static void l2_cr3_read(struct svm_test_data *svm)
> +{
> +	asm volatile ("mov %%cr3, %0" : "=r"(svm->test->scratch) : : "memory");
> +}
> +static void prepare_cr3_intercept(struct svm_test_data *svm)
> +{
> +	svm->vmcb->control.intercept_cr_read |= 1 << 3;
> +}
> +
> +static struct test tests[] = {
> +	/* name, supported, custom setup, l2 code, exit code, custom check, finished */
> +	{"vmmcall", NULL, NULL, l2_vmcall, SVM_EXIT_VMMCALL},
> +	{"vmrun", NULL, NULL, l2_vmrun, SVM_EXIT_VMRUN},
> +	{"CR3 read intercept", NULL, prepare_cr3_intercept, l2_cr3_read, SVM_EXIT_READ_CR3},
> +};

selftests are usualy not that well structured :-) E.g. we don't have
sub-tests and a way to specify which one to run so there is a single
flow when everything is being executed. I'd suggest to keep things as
simple as possibe (especially in the basic 'svm' test).

> +
> +static void l1_guest_code(struct svm_test_data *svm)
> +{
> +	#define L2_GUEST_STACK_SIZE 64
> +	unsigned long l2_guest_stack[L2_GUEST_STACK_SIZE];
> +	struct vmcb *vmcb = svm->vmcb;
> +
> +	/* Prepare for L2 execution. */
> +	generic_svm_setup(svm, svm->test->l2_guest_code,
> +			  &l2_guest_stack[L2_GUEST_STACK_SIZE]);
> +	if (svm->test->l1_custom_setup)
> +		svm->test->l1_custom_setup(svm);
> +
> +	run_guest(vmcb, svm->vmcb_gpa);
> +	do {
> +		run_guest(vmcb, svm->vmcb_gpa);
> +		if (!svm->test->finished)
> +			break;
> +	} while (!svm->test->finished(svm));
> +
> +	GUEST_ASSERT(vmcb->control.exit_code ==
> +			svm->test->expected_exit_code);
> +	GUEST_DONE();
> +}
> +
> +int main(int argc, char *argv[])
> +{
> +	vm_vaddr_t svm_gva;
> +	int i;
> +
> +	nested_svm_check_supported();
> +
> +
> +	for (i = 0; i < ARRAY_SIZE(tests); i++) {
> +		struct svm_test_data *svm;
> +
> +		vm = vm_create_default(VCPU_ID, 0, (void *) l1_guest_code);
> +		vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
> +
> +		/* Allocate VMX pages and shared descriptors (svm_pages). */
> +		svm = vcpu_alloc_svm(vm, &svm_gva);
> +		svm->test = &tests[i];
> +		vcpu_args_set(vm, VCPU_ID, 1, svm_gva);
> +
> +		printf("Execute test %s\n", svm->test->name);
> +
> +		for (;;) {
> +			volatile struct kvm_run *run = vcpu_state(vm, VCPU_ID);
> +			struct ucall uc;
> +
> +			vcpu_run(vm, VCPU_ID);
> +			TEST_ASSERT(run->exit_reason == KVM_EXIT_IO,
> +				    "Got exit_reason other than KVM_EXIT_IO: %u (%s)\n",
> +				    run->exit_reason,
> +				    exit_reason_str(run->exit_reason));
> +
> +			switch (get_ucall(vm, VCPU_ID, &uc)) {
> +			case UCALL_ABORT:
> +				TEST_ASSERT(false, "%s",
> +					    (const char *)uc.args[0]);
> +				/* NOT REACHED */
> +			case UCALL_SYNC:
> +				break;
> +			case UCALL_DONE:
> +				goto done;
> +			default:
> +				TEST_ASSERT(false,
> +					    "Unknown ucall 0x%x.", uc.cmd);
> +			}
> +		}
> +done:
> +		kvm_vm_free(vm);
> +	}
> +	return 0;
> +}

-- 
Vitaly

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