Message-ID: <a1b1c014-4fc4-8b1e-266d-d124d987a8a3@redhat.com>
Date:   Mon, 3 Feb 2020 10:26:35 +0100
From:   Auger Eric <eric.auger@...hat.com>
To:     Wei Huang <wei.huang2@....com>, eric.auger.pro@...il.com,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        pbonzini@...hat.com, vkuznets@...hat.com
Cc:     thuth@...hat.com, drjones@...hat.com
Subject: Re: [PATCH] selftests: KVM: AMD Nested SVM test infrastructure

Hi Wei,

On 1/22/20 12:02 AM, Wei Huang wrote:
> Hi Eric,
> 
> There is a compilation error with this patch. See comments below. I will review your patchset again after you split them.
> 
> -Wei
> 
> On 1/17/20 11:37 AM, Eric Auger wrote:
>> 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>
>>
>> ---
>>
>> Given the amount of code taken from KVM unit test, I would be
>> more than happy to transfer any authorship. Please let me know.
>> ---
>>  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 ++++++
>>  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)
>> +
>> +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;
>> +};
>> +
>> +#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"
> 
> vmload requires a default %%rax as input parameter. You are trying to use %[vmcb_gpa] as a symblic input to vmload, vmrun and vmsave. However this %[vmcb_gpa] symblic name has a constraint of general register (in [vmcb_gpa] "r" (vmcb_gpa)). This doesn't guarantee to be %rax. My Fedora 31 GCC complains:
> 
> lib/x86_64/svm.c: Assembler messages:
> lib/x86_64/svm.c:180: Error: can't use register '%rbp' as operand 1 in 'vmload'.
> lib/x86_64/svm.c:199: Error: can't use register '%rbp' as operand 1 in 'vmrun'.
> lib/x86_64/svm.c:218: Error: can't use register '%rbp' as operand 1 in 'vmsave'
> 
> I think you might want to load [vmcb_gpa] to %rax first and then use %rax directly in vmload/vmrun/vmsave. Something like:
> 
> "mov %[vmcb_gpa], %%rax\n\t"
> "vmrun %%rax\n\t"
I eventually changed the asm contraint:
[vmcb_gpa] "a" (vmcb_gpa)

This should do the job.

Thanks

Eric

> 
>> +		"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},
>> +};
>> +
>> +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;
>> +}
>>
> 

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