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SUSE:SLE-15-SP2:Update
xen.35285
xsa456-0h.patch
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File xsa456-0h.patch of Package xen.35285
# Commit c62673c4334b3372ebd4292a7ac8185357e7ea27 # Date 2024-04-09 16:37:30 +0100 # Author Andrew Cooper <andrew.cooper3@citrix.com> # Committer Andrew Cooper <andrew.cooper3@citrix.com> x86/spec-ctrl: Rename spec_ctrl_flags to scf XSA-455 was ultimately caused by having fields with too-similar names. Both {xen,last}_spec_ctrl are fields containing an architectural MSR_SPEC_CTRL value. The spec_ctrl_flags field contains Xen-internal flags. To more-obviously distinguish the two, rename spec_ctrl_flags to scf, which is also the prefix of the constants used by the fields. No functional change. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Acked-by: Jan Beulich <jbeulich@suse.com> --- a/xen/arch/x86/acpi/power.c +++ b/xen/arch/x86/acpi/power.c @@ -246,7 +246,7 @@ static int enter_state(u32 state) ci = get_cpu_info(); /* Avoid NMI/#MC using unsafe MSRs until we've reloaded microcode. */ - ci->spec_ctrl_flags &= ~SCF_IST_MASK; + ci->scf &= ~SCF_IST_MASK; ACPI_FLUSH_CPU_CACHE(); @@ -293,7 +293,7 @@ static int enter_state(u32 state) panic("Missing previously available feature(s)\n"); /* Re-enabled default NMI/#MC use of MSRs now microcode is loaded. */ - ci->spec_ctrl_flags |= (default_spec_ctrl_flags & SCF_IST_MASK); + ci->scf |= (default_scf & SCF_IST_MASK); if ( boot_cpu_has(X86_FEATURE_IBRSB) || boot_cpu_has(X86_FEATURE_IBRS) ) wrmsrl(MSR_SPEC_CTRL, default_xen_spec_ctrl); --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -1814,10 +1814,10 @@ void context_switch(struct vcpu *prev, s } } - /* Update the top-of-stack block with the new spec_ctrl settings. */ - info->spec_ctrl_flags = - (info->spec_ctrl_flags & ~SCF_DOM_MASK) | - (nextd->arch.spec_ctrl_flags & SCF_DOM_MASK); + /* Update the top-of-stack block with the new speculation settings. */ + info->scf = + (info->scf & ~SCF_DOM_MASK) | + (nextd->arch.scf & SCF_DOM_MASK); } sched_context_switched(prev, next); --- a/xen/arch/x86/hvm/svm/entry.S +++ b/xen/arch/x86/hvm/svm/entry.S @@ -94,7 +94,7 @@ __UNLIKELY_END(nsvm_hap) /* SPEC_CTRL_ENTRY_FROM_SVM Req: %rsp=regs/cpuinfo, %rdx=0 Clob: ac */ .macro svm_vmexit_cond_ibpb - testb $SCF_entry_ibpb, CPUINFO_spec_ctrl_flags(%rsp) + testb $SCF_entry_ibpb, CPUINFO_scf(%rsp) jz .L_skip_ibpb mov $MSR_PRED_CMD, %ecx --- a/xen/arch/x86/hvm/vmx/entry.S +++ b/xen/arch/x86/hvm/vmx/entry.S @@ -107,7 +107,7 @@ UNLIKELY_END(realmode) BUILD_BUG_ON(SCF_verw & ~0xff) movzbl VCPU_vmx_launched(%rbx), %ecx shl $31, %ecx - movzbl CPUINFO_spec_ctrl_flags(%rsp), %eax + movzbl CPUINFO_scf(%rsp), %eax and $SCF_verw, %eax or %eax, %ecx --- a/xen/arch/x86/hvm/vmx/vmcs.c +++ b/xen/arch/x86/hvm/vmx/vmcs.c @@ -1355,7 +1355,7 @@ static int construct_vmcs(struct vcpu *v rc = vmx_add_msr(v, MSR_FLUSH_CMD, FLUSH_CMD_L1D, VMX_MSR_GUEST_LOADONLY); - if ( !rc && (d->arch.spec_ctrl_flags & SCF_entry_ibpb) ) + if ( !rc && (d->arch.scf & SCF_entry_ibpb) ) rc = vmx_add_msr(v, MSR_PRED_CMD, PRED_CMD_IBPB, VMX_MSR_HOST); --- a/xen/arch/x86/setup.c +++ b/xen/arch/x86/setup.c @@ -1848,7 +1848,7 @@ void __init noreturn __start_xen(unsigne if ( bsp_delay_spec_ctrl ) { - get_cpu_info()->spec_ctrl_flags &= ~SCF_use_shadow; + get_cpu_info()->scf &= ~SCF_use_shadow; barrier(); wrmsrl(MSR_SPEC_CTRL, default_xen_spec_ctrl); } --- a/xen/arch/x86/spec_ctrl.c +++ b/xen/arch/x86/spec_ctrl.c @@ -67,7 +67,7 @@ static bool __initdata opt_lock_harden; bool __initdata bsp_delay_spec_ctrl; uint8_t __read_mostly default_xen_spec_ctrl; -uint8_t __read_mostly default_spec_ctrl_flags; +uint8_t __read_mostly default_scf; paddr_t __read_mostly l1tf_addr_mask, __read_mostly l1tf_safe_maddr; static bool __initdata cpu_has_bug_l1tf; @@ -1044,7 +1044,7 @@ static void __init ibpb_calculations(voi * NMI/#MC, so can't interrupt Xen ahead of having already flushed the * BTB. */ - default_spec_ctrl_flags |= SCF_ist_ibpb; + default_scf |= SCF_ist_ibpb; } if ( opt_ibpb_entry_hvm ) setup_force_cpu_cap(X86_FEATURE_IBPB_ENTRY_HVM); @@ -1545,7 +1545,7 @@ void spec_ctrl_init_domain(struct domain bool ibpb = ((pv ? opt_ibpb_entry_pv : opt_ibpb_entry_hvm) && (d->domain_id != 0 || opt_ibpb_entry_dom0)); - d->arch.spec_ctrl_flags = + d->arch.scf = (verw ? SCF_verw : 0) | (ibpb ? SCF_entry_ibpb : 0) | 0; @@ -1628,7 +1628,7 @@ void __init init_speculation_mitigations { if ( opt_msr_sc_pv ) { - default_spec_ctrl_flags |= SCF_ist_sc_msr; + default_scf |= SCF_ist_sc_msr; setup_force_cpu_cap(X86_FEATURE_SC_MSR_PV); } @@ -1639,7 +1639,7 @@ void __init init_speculation_mitigations * Xen's value is not restored atomically. An early NMI hitting * the VMExit path needs to restore Xen's value for safety. */ - default_spec_ctrl_flags |= SCF_ist_sc_msr; + default_scf |= SCF_ist_sc_msr; setup_force_cpu_cap(X86_FEATURE_SC_MSR_HVM); } } @@ -1725,7 +1725,7 @@ void __init init_speculation_mitigations if ( opt_rsb_pv ) { setup_force_cpu_cap(X86_FEATURE_SC_RSB_PV); - default_spec_ctrl_flags |= SCF_ist_rsb; + default_scf |= SCF_ist_rsb; } /* @@ -1745,7 +1745,7 @@ void __init init_speculation_mitigations if ( opt_eager_fpu == -1 ) opt_eager_fpu = should_use_eager_fpu(); - /* (Re)init BSP state now that default_spec_ctrl_flags has been calculated. */ + /* (Re)init BSP state now that default_scf has been calculated. */ init_shadow_spec_ctrl_state(); /* @@ -2013,7 +2013,7 @@ void __init init_speculation_mitigations info->shadow_spec_ctrl = 0; barrier(); - info->spec_ctrl_flags |= SCF_use_shadow; + info->scf |= SCF_use_shadow; barrier(); } --- a/xen/arch/x86/x86_64/asm-offsets.c +++ b/xen/arch/x86/x86_64/asm-offsets.c @@ -145,7 +145,7 @@ void __dummy__(void) OFFSET(CPUINFO_pv_cr3, struct cpu_info, pv_cr3); OFFSET(CPUINFO_shadow_spec_ctrl, struct cpu_info, shadow_spec_ctrl); OFFSET(CPUINFO_xen_spec_ctrl, struct cpu_info, xen_spec_ctrl); - OFFSET(CPUINFO_spec_ctrl_flags, struct cpu_info, spec_ctrl_flags); + OFFSET(CPUINFO_scf, struct cpu_info, scf); OFFSET(CPUINFO_root_pgt_changed, struct cpu_info, root_pgt_changed); OFFSET(CPUINFO_use_pv_cr3, struct cpu_info, use_pv_cr3); DEFINE(CPUINFO_sizeof, sizeof(struct cpu_info)); --- a/xen/arch/x86/x86_64/compat/entry.S +++ b/xen/arch/x86/x86_64/compat/entry.S @@ -163,8 +163,8 @@ ENTRY(compat_restore_all_guest) /* Account for ev/ec having already been popped off the stack. */ SPEC_CTRL_COND_VERW \ - scf=STK_REL(CPUINFO_spec_ctrl_flags, CPUINFO_rip), \ - sel=STK_REL(CPUINFO_verw_sel, CPUINFO_rip) + scf=STK_REL(CPUINFO_scf, CPUINFO_rip), \ + sel=STK_REL(CPUINFO_verw_sel, CPUINFO_rip) .Lft0: iretq _ASM_PRE_EXTABLE(.Lft0, handle_exception) --- a/xen/arch/x86/x86_64/entry.S +++ b/xen/arch/x86/x86_64/entry.S @@ -589,7 +589,7 @@ UNLIKELY_END(exit_cr3) /* * When the CPU pushed this exception frame, it zero-extended eflags. * For an IST exit, SPEC_CTRL_EXIT_TO_XEN stashed shadow copies of - * spec_ctrl_flags and ver_sel above eflags, as we can't use any GPRs, + * scf and ver_sel above eflags, as we can't use any GPRs, * and we're at a random place on the stack, not in a CPUFINFO block. * * Account for ev/ec having already been popped off the stack. --- a/xen/include/asm-x86/current.h +++ b/xen/include/asm-x86/current.h @@ -56,7 +56,7 @@ struct cpu_info { /* See asm-x86/spec_ctrl_asm.h for usage. */ unsigned int shadow_spec_ctrl; uint8_t xen_spec_ctrl; - uint8_t spec_ctrl_flags; + uint8_t scf; /* SCF_* */ /* * The following field controls copying of the L4 page table of 64-bit --- a/xen/include/asm-x86/domain.h +++ b/xen/include/asm-x86/domain.h @@ -295,7 +295,7 @@ struct arch_domain uint32_t pci_cf8; uint8_t cmos_idx; - uint8_t spec_ctrl_flags; /* See SCF_DOM_MASK */ + uint8_t scf; /* See SCF_DOM_MASK */ union { struct pv_domain pv; --- a/xen/include/asm-x86/spec_ctrl.h +++ b/xen/include/asm-x86/spec_ctrl.h @@ -21,10 +21,10 @@ #define __X86_SPEC_CTRL_H__ /* - * Encoding of: - * cpuinfo.spec_ctrl_flags - * default_spec_ctrl_flags - * domain.spec_ctrl_flags + * Encoding of Xen's speculation control flags in: + * cpuinfo.scf + * default_scf + * domain.scf * * Live settings are in the top-of-stack block, because they need to be * accessable when XPTI is active. Some settings are fixed from boot, some @@ -95,7 +95,7 @@ extern bool opt_branch_harden; extern bool bsp_delay_spec_ctrl; extern uint8_t default_xen_spec_ctrl; -extern uint8_t default_spec_ctrl_flags; +extern uint8_t default_scf; extern int8_t opt_xpti_hwdom, opt_xpti_domu; @@ -114,7 +114,7 @@ static inline void init_shadow_spec_ctrl info->shadow_spec_ctrl = 0; info->xen_spec_ctrl = default_xen_spec_ctrl; - info->spec_ctrl_flags = default_spec_ctrl_flags; + info->scf = default_scf; /* * For least latency, the VERW selector should be a writeable data @@ -138,7 +138,7 @@ static always_inline void spec_ctrl_ente */ info->shadow_spec_ctrl = val; barrier(); - info->spec_ctrl_flags |= SCF_use_shadow; + info->scf |= SCF_use_shadow; barrier(); alternative_input("", "wrmsr", X86_FEATURE_SC_MSR_IDLE, "a" (val), "c" (MSR_SPEC_CTRL), "d" (0)); @@ -172,7 +172,7 @@ static always_inline void spec_ctrl_exit * Disable shadowing before updating the MSR. There are no SMP issues * here; only local processor ordering concerns. */ - info->spec_ctrl_flags &= ~SCF_use_shadow; + info->scf &= ~SCF_use_shadow; barrier(); alternative_input("", "wrmsr", X86_FEATURE_SC_MSR_IDLE, "a" (val), "c" (MSR_SPEC_CTRL), "d" (0)); --- a/xen/include/asm-x86/spec_ctrl_asm.h +++ b/xen/include/asm-x86/spec_ctrl_asm.h @@ -47,7 +47,7 @@ * current before loading Xen's MSR_SPEC_CTRL setting. * * Factor 2 is harder. We maintain a shadow_spec_ctrl value, and a use_shadow - * boolean in the per cpu spec_ctrl_flags. The synchronous use is: + * boolean in the per cpu scf. The synchronous use is: * * 1) Store guest value in shadow_spec_ctrl * 2) Set the use_shadow boolean @@ -90,11 +90,11 @@ * interrupting Xen. */ .if \maybexen - testb $SCF_entry_ibpb, STACK_CPUINFO_FIELD(spec_ctrl_flags)(%r14) + testb $SCF_entry_ibpb, STACK_CPUINFO_FIELD(scf)(%r14) jz .L\@_skip testb $3, UREGS_cs(%rsp) .else - testb $SCF_entry_ibpb, CPUINFO_spec_ctrl_flags(%rsp) + testb $SCF_entry_ibpb, CPUINFO_scf(%rsp) .endif jz .L\@_skip @@ -164,7 +164,7 @@ xor %edx, %edx /* Clear SPEC_CTRL shadowing *before* loading Xen's value. */ - andb $~SCF_use_shadow, CPUINFO_spec_ctrl_flags(%rsp) + andb $~SCF_use_shadow, CPUINFO_scf(%rsp) /* Load Xen's intended value. */ movzbl CPUINFO_xen_spec_ctrl(%rsp), %eax @@ -179,8 +179,8 @@ #define STK_REL(field, top_of_stk) ((field) - (top_of_stk)) .macro SPEC_CTRL_COND_VERW \ - scf=STK_REL(CPUINFO_spec_ctrl_flags, CPUINFO_error_code), \ - sel=STK_REL(CPUINFO_verw_sel, CPUINFO_error_code) + scf=STK_REL(CPUINFO_scf, CPUINFO_error_code), \ + sel=STK_REL(CPUINFO_verw_sel, CPUINFO_error_code) /* * Requires \scf and \sel as %rsp-relative expressions * Clobbers eflags @@ -235,10 +235,10 @@ testb $3, UREGS_cs(%rsp) setnz %al not %eax - and %al, STACK_CPUINFO_FIELD(spec_ctrl_flags)(%r14) + and %al, STACK_CPUINFO_FIELD(scf)(%r14) movzbl STACK_CPUINFO_FIELD(xen_spec_ctrl)(%r14), %eax .else - andb $~SCF_use_shadow, CPUINFO_spec_ctrl_flags(%rsp) + andb $~SCF_use_shadow, CPUINFO_scf(%rsp) movzbl CPUINFO_xen_spec_ctrl(%rsp), %eax .endif @@ -257,7 +257,7 @@ mov %eax, CPUINFO_shadow_spec_ctrl(%rsp) /* Set SPEC_CTRL shadowing *before* loading the guest value. */ - orb $SCF_use_shadow, CPUINFO_spec_ctrl_flags(%rsp) + orb $SCF_use_shadow, CPUINFO_scf(%rsp) mov $MSR_SPEC_CTRL, %ecx xor %edx, %edx @@ -335,7 +335,7 @@ * DO_SPEC_CTRL_ENTRY maybexen=1 * but with conditionals rather than alternatives. */ - movzbl STACK_CPUINFO_FIELD(spec_ctrl_flags)(%r14), %ebx + movzbl STACK_CPUINFO_FIELD(scf)(%r14), %ebx test $SCF_ist_ibpb, %bl jz .L\@_skip_ibpb @@ -360,7 +360,7 @@ testb $3, UREGS_cs(%rsp) setnz %al not %eax - and %al, STACK_CPUINFO_FIELD(spec_ctrl_flags)(%r14) + and %al, STACK_CPUINFO_FIELD(scf)(%r14) /* Load Xen's intended value. */ mov $MSR_SPEC_CTRL, %ecx @@ -394,7 +394,7 @@ UNLIKELY_DISPATCH_LABEL(\@_serialise): * Requires %r12=ist_exit, %r14=stack_end, %rsp=regs * Clobbers %rax, %rbx, %rcx, %rdx */ - movzbl STACK_CPUINFO_FIELD(spec_ctrl_flags)(%r14), %ebx + movzbl STACK_CPUINFO_FIELD(scf)(%r14), %ebx testb $SCF_ist_sc_msr, %bl jz .L\@_skip_sc_msr
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