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[PATCH V2] is_system_domain: replace open-coded instances

To: Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx

From: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>

Date: Mon, 20 Dec 2021 10:50:13 -0500

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Cc: Christopher Clark <christopher.w.clark@xxxxxxxxx>, "Daniel P . Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>

Delivery-date: Mon, 20 Dec 2021 11:48:27 +0000

List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

From: Christopher Clark <christopher.w.clark@xxxxxxxxx> This is a split out of the hyperlaunch dom0 series. There were several instances of open-coded domid range checking. This commit replaces those with the is_system_domain or is_system_domid inline function. Signed-off-by: Christopher Clark <christopher.w.clark@xxxxxxxxx> Signed-off-by: Daniel P. Smith <dpsmith@xxxxxxxxxxxxxxxxxxxx> Acked-by: Dario Faggioli <dfaggioli@xxxxxxxx> --- xen/arch/x86/cpu/mcheck/mce.c | 2 +- xen/arch/x86/cpu/vpmu.c | 2 +- xen/common/domain.c | 2 +- xen/common/domctl.c | 4 +- xen/common/sched/core.c | 4 +- xen/include/asm-x86/asm-macros.h | 86 ++++++++++++++++++++ xen/include/asm-x86/asm-offsets.h | 127 ++++++++++++++++++++++++++++++ xen/include/xen/sched.h | 7 +- 8 files changed, 226 insertions(+), 8 deletions(-) create mode 100644 xen/include/asm-x86/asm-macros.h create mode 100644 xen/include/asm-x86/asm-offsets.h diff --git a/xen/arch/x86/cpu/mcheck/mce.c b/xen/arch/x86/cpu/mcheck/mce.c index 7f433343bc..5c1df39075 100644 --- a/xen/arch/x86/cpu/mcheck/mce.c +++ b/xen/arch/x86/cpu/mcheck/mce.c @@ -1518,7 +1518,7 @@ long do_mca(XEN_GUEST_HANDLE_PARAM(xen_mc_t) u_xen_mc) d = rcu_lock_domain_by_any_id(mc_msrinject->mcinj_domid); if ( d == NULL ) { - if ( mc_msrinject->mcinj_domid >= DOMID_FIRST_RESERVED ) + if ( is_system_domid(mc_msrinject->mcinj_domid) ) return x86_mcerr("do_mca inject: incompatible flag " "MC_MSRINJ_F_GPADDR with domain %d", -EINVAL, domid); diff --git a/xen/arch/x86/cpu/vpmu.c b/xen/arch/x86/cpu/vpmu.c index 8ec4547bed..c6bfa5a00e 100644 --- a/xen/arch/x86/cpu/vpmu.c +++ b/xen/arch/x86/cpu/vpmu.c @@ -188,7 +188,7 @@ void vpmu_do_interrupt(struct cpu_user_regs *regs) * in XENPMU_MODE_ALL, for everyone. */ if ( (vpmu_mode & XENPMU_MODE_ALL) || - (sampled->domain->domain_id >= DOMID_FIRST_RESERVED) ) + is_system_domain(sampled->domain) ) { sampling = choose_hwdom_vcpu(); if ( !sampling ) diff --git a/xen/common/domain.c b/xen/common/domain.c index 093bb4403f..347cc073aa 100644 --- a/xen/common/domain.c +++ b/xen/common/domain.c @@ -583,7 +583,7 @@ struct domain *domain_create(domid_t domid, /* Sort out our idea of is_hardware_domain(). */ if ( domid == 0 || domid == hardware_domid ) { - if ( hardware_domid < 0 || hardware_domid >= DOMID_FIRST_RESERVED ) + if ( hardware_domid < 0 || is_system_domid(hardware_domid) ) panic("The value of hardware_dom must be a valid domain ID\n"); old_hwdom = hardware_domain; diff --git a/xen/common/domctl.c b/xen/common/domctl.c index 879a2adcbe..a3ad1f62b6 100644 --- a/xen/common/domctl.c +++ b/xen/common/domctl.c @@ -52,7 +52,7 @@ static inline int is_free_domid(domid_t dom) { struct domain *d; - if ( dom >= DOMID_FIRST_RESERVED ) + if ( is_system_domid(dom) ) return 0; if ( (d = rcu_lock_domain_by_id(dom)) == NULL ) @@ -536,7 +536,7 @@ long do_domctl(XEN_GUEST_HANDLE_PARAM(xen_domctl_t) u_domctl) if ( !d ) { ret = -EINVAL; - if ( op->domain >= DOMID_FIRST_RESERVED ) + if ( is_system_domid(op->domain) ) break; rcu_read_lock(&domlist_read_lock); diff --git a/xen/common/sched/core.c b/xen/common/sched/core.c index 8f4b1ca10d..6ea8bcf62f 100644 --- a/xen/common/sched/core.c +++ b/xen/common/sched/core.c @@ -821,7 +821,7 @@ int sched_init_domain(struct domain *d, unsigned int poolid) int ret; ASSERT(d->cpupool == NULL); - ASSERT(d->domain_id < DOMID_FIRST_RESERVED); + ASSERT(!is_system_domain(d)); if ( (ret = cpupool_add_domain(d, poolid)) ) return ret; @@ -845,7 +845,7 @@ int sched_init_domain(struct domain *d, unsigned int poolid) void sched_destroy_domain(struct domain *d) { - ASSERT(d->domain_id < DOMID_FIRST_RESERVED); + ASSERT(!is_system_domain(d)); if ( d->cpupool ) { diff --git a/xen/include/asm-x86/asm-macros.h b/xen/include/asm-x86/asm-macros.h new file mode 100644 index 0000000000..0c3d538b5c --- /dev/null +++ b/xen/include/asm-x86/asm-macros.h @@ -0,0 +1,86 @@ +#if 0 +.if 0 +#endif +#ifndef __ASM_MACROS_H__ +#define __ASM_MACROS_H__ +asm ( ".include \"/home/build/projects/starlab/xen-private/xen/include/asm-x86/asm-macros.h\"" ); +#endif /* __ASM_MACROS_H__ */ +#if 0 +.endif +.macro vmrun + .byte 0x0f, 0x01, 0xd8 +.endm +.macro stgi + .byte 0x0f, 0x01, 0xdc +.endm +.macro clgi + .byte 0x0f, 0x01, 0xdd +.endm +.macro INDIRECT_BRANCH insn:req arg:req + .if 1 == 1 + $done = 0 + .irp reg, ax, cx, dx, bx, bp, si, di, 8, 9, 10, 11, 12, 13, 14, 15 + .ifeqs "\arg", "%r\reg" + \insn __x86_indirect_thunk_r\reg + $done = 1 + .exitm + .endif + .endr + .if $done != 1 + .error "Bad register arg \arg" + .endif + .else + \insn *\arg + .endif +.endm +.macro INDIRECT_CALL arg:req + INDIRECT_BRANCH call \arg +.endm +.macro INDIRECT_JMP arg:req + INDIRECT_BRANCH jmp \arg +.endm +.macro guest_access_mask_ptr ptr:req, scratch1:req, scratch2:req + mov $((((((256 >> 8) * 0xffff000000000000) | (256 << 39))) + (1 << 39)*16) - 1), \scratch1 + mov $~0, \scratch2 + cmp \ptr, \scratch1 + rcr $1, \scratch2 + and \scratch2, \ptr +.endm +.macro altinstruction_entry orig repl feature orig_len repl_len pad_len + .long \orig - . + .long \repl - . + .word \feature + .byte \orig_len + .byte \repl_len + .byte \pad_len + .byte 0 +.endm +.macro mknops nr_bytes + .nops \nr_bytes, 9 +.endm +.macro ALTERNATIVE oldinstr, newinstr, feature + .L\@_orig_s: \oldinstr; .L\@_orig_e: .L\@_diff = (.L\@_repl_e\()1 - .L\@_repl_s\()1) - (.L\@_orig_e - .L\@_orig_s); mknops ((-(.L\@_diff > 0)) * .L\@_diff); .L\@_orig_p: + .pushsection .altinstructions, "a", @progbits + altinstruction_entry .L\@_orig_s, .L\@_repl_s1, \feature, (.L\@_orig_e - .L\@_orig_s), (.L\@_repl_e\()1 - .L\@_repl_s\()1), (.L\@_orig_p - .L\@_orig_e) + .section .discard, "a", @progbits + .byte (.L\@_orig_p - .L\@_orig_s) + .byte 0xff + (.L\@_repl_e\()1 - .L\@_repl_s\()1) - (.L\@_orig_p - .L\@_orig_s) + .section .altinstr_replacement, "ax", @progbits + .L\@_repl_s\()1: \newinstr; .L\@_repl_e\()1: + .popsection +.endm +.macro ALTERNATIVE_2 oldinstr, newinstr1, feature1, newinstr2, feature2 + .L\@_orig_s: \oldinstr; .L\@_orig_e: .L\@_diff = (((.L\@_repl_e\()1 - .L\@_repl_s\()1)) ^ ((((.L\@_repl_e\()1 - .L\@_repl_s\()1)) ^ ((.L\@_repl_e\()2 - .L\@_repl_s\()2))) & -(-(((.L\@_repl_e\()1 - .L\@_repl_s\()1)) < ((.L\@_repl_e\()2 - .L\@_repl_s\()2)))))) - (.L\@_orig_e - .L\@_orig_s); mknops ((-(.L\@_diff > 0)) * .L\@_diff); .L\@_orig_p: + .pushsection .altinstructions, "a", @progbits + altinstruction_entry .L\@_orig_s, .L\@_repl_s1, \feature1, (.L\@_orig_e - .L\@_orig_s), (.L\@_repl_e\()1 - .L\@_repl_s\()1), (.L\@_orig_p - .L\@_orig_e) + altinstruction_entry .L\@_orig_s, .L\@_repl_s2, \feature2, (.L\@_orig_e - .L\@_orig_s), (.L\@_repl_e\()2 - .L\@_repl_s\()2), (.L\@_orig_p - .L\@_orig_e) + .section .discard, "a", @progbits + .byte (.L\@_orig_p - .L\@_orig_s) + .byte 0xff + (.L\@_repl_e\()1 - .L\@_repl_s\()1) - (.L\@_orig_p - .L\@_orig_s) + .byte 0xff + (.L\@_repl_e\()2 - .L\@_repl_s\()2) - (.L\@_orig_p - .L\@_orig_s) + .section .altinstr_replacement, "ax", @progbits + .L\@_repl_s\()1: \newinstr1; .L\@_repl_e\()1: + .L\@_repl_s\()2: \newinstr2; .L\@_repl_e\()2: + .popsection +.endm +#endif diff --git a/xen/include/asm-x86/asm-offsets.h b/xen/include/asm-x86/asm-offsets.h new file mode 100644 index 0000000000..5eeced15ec --- /dev/null +++ b/xen/include/asm-x86/asm-offsets.h @@ -0,0 +1,127 @@ +/* + * DO NOT MODIFY. + * + * This file was auto-generated from asm-offsets.s + * + */ + +#ifndef __ASM_OFFSETS_H__ +#define __ASM_OFFSETS_H__ + +#define UREGS_r15 0 /* offsetof(struct cpu_user_regs, r15) */ +#define UREGS_r14 8 /* offsetof(struct cpu_user_regs, r14) */ +#define UREGS_r13 16 /* offsetof(struct cpu_user_regs, r13) */ +#define UREGS_r12 24 /* offsetof(struct cpu_user_regs, r12) */ +#define UREGS_rbp 32 /* offsetof(struct cpu_user_regs, rbp) */ +#define UREGS_rbx 40 /* offsetof(struct cpu_user_regs, rbx) */ +#define UREGS_r11 48 /* offsetof(struct cpu_user_regs, r11) */ +#define UREGS_r10 56 /* offsetof(struct cpu_user_regs, r10) */ +#define UREGS_r9 64 /* offsetof(struct cpu_user_regs, r9) */ +#define UREGS_r8 72 /* offsetof(struct cpu_user_regs, r8) */ +#define UREGS_rax 80 /* offsetof(struct cpu_user_regs, rax) */ +#define UREGS_rcx 88 /* offsetof(struct cpu_user_regs, rcx) */ +#define UREGS_rdx 96 /* offsetof(struct cpu_user_regs, rdx) */ +#define UREGS_rsi 104 /* offsetof(struct cpu_user_regs, rsi) */ +#define UREGS_rdi 112 /* offsetof(struct cpu_user_regs, rdi) */ +#define UREGS_error_code 120 /* offsetof(struct cpu_user_regs, error_code) */ +#define UREGS_entry_vector 124 /* offsetof(struct cpu_user_regs, entry_vector) */ +#define UREGS_rip 128 /* offsetof(struct cpu_user_regs, rip) */ +#define UREGS_cs 136 /* offsetof(struct cpu_user_regs, cs) */ +#define UREGS_eflags 144 /* offsetof(struct cpu_user_regs, rflags) */ +#define UREGS_rsp 152 /* offsetof(struct cpu_user_regs, rsp) */ +#define UREGS_ss 160 /* offsetof(struct cpu_user_regs, ss) */ +#define UREGS_kernel_sizeof 168 /* offsetof(struct cpu_user_regs, es) */ + +#define VCPU_processor 4 /* offsetof(struct vcpu, processor) */ +#define VCPU_domain 16 /* offsetof(struct vcpu, domain) */ +#define VCPU_vcpu_info 8 /* offsetof(struct vcpu, vcpu_info) */ +#define VCPU_trap_bounce 1456 /* offsetof(struct vcpu, arch.pv.trap_bounce) */ +#define VCPU_thread_flags 896 /* offsetof(struct vcpu, arch.flags) */ +#define VCPU_event_addr 1384 /* offsetof(struct vcpu, arch.pv.event_callback_eip) */ +#define VCPU_event_sel 1400 /* offsetof(struct vcpu, arch.pv.event_callback_cs) */ +#define VCPU_syscall_addr 1400 /* offsetof(struct vcpu, arch.pv.syscall_callback_eip) */ +#define VCPU_syscall32_addr 1408 /* offsetof(struct vcpu, arch.pv.syscall32_callback_eip) */ +#define VCPU_syscall32_sel 1424 /* offsetof(struct vcpu, arch.pv.syscall32_callback_cs) */ +#define VCPU_syscall32_disables_events 1428 /* offsetof(struct vcpu, arch.pv.syscall32_disables_events) */ +#define VCPU_sysenter_addr 1416 /* offsetof(struct vcpu, arch.pv.sysenter_callback_eip) */ +#define VCPU_sysenter_sel 1426 /* offsetof(struct vcpu, arch.pv.sysenter_callback_cs) */ +#define VCPU_sysenter_disables_events 1429 /* offsetof(struct vcpu, arch.pv.sysenter_disables_events) */ +#define VCPU_trap_ctxt 1168 /* offsetof(struct vcpu, arch.pv.trap_ctxt) */ +#define VCPU_kernel_sp 1312 /* offsetof(struct vcpu, arch.pv.kernel_sp) */ +#define VCPU_kernel_ss 1304 /* offsetof(struct vcpu, arch.pv.kernel_ss) */ +#define VCPU_iopl 1484 /* offsetof(struct vcpu, arch.pv.iopl) */ +#define VCPU_guest_context_flags 1160 /* offsetof(struct vcpu, arch.pv.vgc_flags) */ +#define VCPU_cr3 2856 /* offsetof(struct vcpu, arch.cr3) */ +#define VCPU_arch_msrs 3416 /* offsetof(struct vcpu, arch.msrs) */ +#define VCPU_nmi_pending 960 /* offsetof(struct vcpu, arch.async_exception_state[(1)-1].pending) */ +#define VCPU_mce_pending 962 /* offsetof(struct vcpu, arch.async_exception_state[(2)-1].pending) */ +#define VCPU_nmi_old_mask 961 /* offsetof(struct vcpu, arch.async_exception_state[(1)-1].old_mask) */ +#define VCPU_mce_old_mask 963 /* offsetof(struct vcpu, arch.async_exception_state[(2)-1].old_mask) */ +#define VCPU_async_exception_mask 964 /* offsetof(struct vcpu, arch.async_exception_mask) */ +#define VCPU_TRAP_NMI 1 /* VCPU_TRAP_NMI */ +#define VCPU_TRAP_MCE 2 /* VCPU_TRAP_MCE */ +#define _VGCF_syscall_disables_events 4 /* _VGCF_syscall_disables_events */ + +#define VCPU_svm_vmcb_pa 1480 /* offsetof(struct vcpu, arch.hvm.svm.vmcb_pa) */ +#define VCPU_svm_vmcb 1472 /* offsetof(struct vcpu, arch.hvm.svm.vmcb) */ + +#define VCPU_vmx_launched 1516 /* offsetof(struct vcpu, arch.hvm.vmx.launched) */ +#define VCPU_vmx_realmode 1738 /* offsetof(struct vcpu, arch.hvm.vmx.vmx_realmode) */ +#define VCPU_vmx_emulate 1739 /* offsetof(struct vcpu, arch.hvm.vmx.vmx_emulate) */ +#define VCPU_vm86_seg_mask 1742 /* offsetof(struct vcpu, arch.hvm.vmx.vm86_segment_mask) */ +#define VCPU_hvm_guest_cr2 1040 /* offsetof(struct vcpu, arch.hvm.guest_cr[2]) */ + +#define VCPU_nhvm_guestmode 1960 /* offsetof(struct vcpu, arch.hvm.nvcpu.nv_guestmode) */ +#define VCPU_nhvm_p2m 2192 /* offsetof(struct vcpu, arch.hvm.nvcpu.nv_p2m) */ +#define VCPU_nsvm_hap_enabled 2148 /* offsetof(struct vcpu, arch.hvm.nvcpu.u.nsvm.ns_hap_enabled) */ + +#define VCPUINFO_upcall_pending 0 /* offsetof(struct vcpu_info, evtchn_upcall_pending) */ +#define VCPUINFO_upcall_mask 1 /* offsetof(struct vcpu_info, evtchn_upcall_mask) */ + +#define CPUINFO_guest_cpu_user_regs 0 /* offsetof(struct cpu_info, guest_cpu_user_regs) */ +#define CPUINFO_verw_sel 204 /* offsetof(struct cpu_info, verw_sel) */ +#define CPUINFO_current_vcpu 208 /* offsetof(struct cpu_info, current_vcpu) */ +#define CPUINFO_per_cpu_offset 216 /* offsetof(struct cpu_info, per_cpu_offset) */ +#define CPUINFO_cr4 224 /* offsetof(struct cpu_info, cr4) */ +#define CPUINFO_xen_cr3 232 /* offsetof(struct cpu_info, xen_cr3) */ +#define CPUINFO_pv_cr3 240 /* offsetof(struct cpu_info, pv_cr3) */ +#define CPUINFO_shadow_spec_ctrl 248 /* offsetof(struct cpu_info, shadow_spec_ctrl) */ +#define CPUINFO_xen_spec_ctrl 252 /* offsetof(struct cpu_info, xen_spec_ctrl) */ +#define CPUINFO_spec_ctrl_flags 253 /* offsetof(struct cpu_info, spec_ctrl_flags) */ +#define CPUINFO_root_pgt_changed 254 /* offsetof(struct cpu_info, root_pgt_changed) */ +#define CPUINFO_use_pv_cr3 255 /* offsetof(struct cpu_info, use_pv_cr3) */ +#define CPUINFO_sizeof 264 /* sizeof(struct cpu_info) */ + +#define TRAPINFO_eip 8 /* offsetof(struct trap_info, address) */ +#define TRAPINFO_cs 2 /* offsetof(struct trap_info, cs) */ +#define TRAPINFO_flags 1 /* offsetof(struct trap_info, flags) */ +#define TRAPINFO_sizeof 16 /* sizeof(struct trap_info) */ + +#define TRAPBOUNCE_error_code 0 /* offsetof(struct trap_bounce, error_code) */ +#define TRAPBOUNCE_flags 4 /* offsetof(struct trap_bounce, flags) */ +#define TRAPBOUNCE_cs 6 /* offsetof(struct trap_bounce, cs) */ +#define TRAPBOUNCE_eip 8 /* offsetof(struct trap_bounce, eip) */ + +#define VCPUMSR_spec_ctrl_raw 0 /* offsetof(struct vcpu_msrs, spec_ctrl.raw) */ + +#define IRQSTAT_shift 7 /* ilog2(sizeof(irq_cpustat_t)) */ +#define IRQSTAT_softirq_pending 0 /* offsetof(irq_cpustat_t, __softirq_pending) */ + +#define CPUINFO_features 12 /* offsetof(struct cpuinfo_x86, x86_capability) */ + +#define MB_flags 0 /* offsetof(multiboot_info_t, flags) */ +#define MB_cmdline 16 /* offsetof(multiboot_info_t, cmdline) */ +#define MB_mem_lower 4 /* offsetof(multiboot_info_t, mem_lower) */ + +#define MB2_fixed_sizeof 8 /* sizeof(multiboot2_fixed_t) */ +#define MB2_fixed_total_size 0 /* offsetof(multiboot2_fixed_t, total_size) */ +#define MB2_tag_type 0 /* offsetof(multiboot2_tag_t, type) */ +#define MB2_tag_size 4 /* offsetof(multiboot2_tag_t, size) */ +#define MB2_load_base_addr 8 /* offsetof(multiboot2_tag_load_base_addr_t, load_base_addr) */ +#define MB2_mem_lower 8 /* offsetof(multiboot2_tag_basic_meminfo_t, mem_lower) */ +#define MB2_efi64_st 8 /* offsetof(multiboot2_tag_efi64_t, pointer) */ +#define MB2_efi64_ih 8 /* offsetof(multiboot2_tag_efi64_ih_t, pointer) */ + +#define DOMAIN_vm_assist 544 /* offsetof(struct domain, vm_assist) */ + +#endif diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h index 28146ee404..0df72baf2e 100644 --- a/xen/include/xen/sched.h +++ b/xen/include/xen/sched.h @@ -613,9 +613,14 @@ extern struct vcpu *idle_vcpu[NR_CPUS]; #define is_idle_domain(d) ((d)->domain_id == DOMID_IDLE) #define is_idle_vcpu(v) (is_idle_domain((v)->domain)) +static inline bool is_system_domid(domid_t id) +{ + return (id >= DOMID_FIRST_RESERVED); +} + static inline bool is_system_domain(const struct domain *d) { - return d->domain_id >= DOMID_FIRST_RESERVED; + return is_system_domid(d->domain_id); } #define DOMAIN_DESTROYED (1u << 31) /* assumes atomic_t is >= 32 bits */ -- 2.20.1

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