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xen.30330
xsa435-0-23.patch
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File xsa435-0-23.patch of Package xen.30330
From bd13dae34809e61e37ba1cd5de893c5c10c46256 Mon Sep 17 00:00:00 2001 From: Andrew Cooper <andrew.cooper3@citrix.com> Date: Wed, 29 Mar 2023 11:32:25 +0100 Subject: x86: Merge a domain's {cpuid,msr} policy objects Right now, they're the same underlying type, containing disjoint information. Drop the d->arch.msr pointer, and union d->arch.cpuid to give it a second name of cpu_policy in the interim. Merge init_domain_{cpuid,msr}_policy() into a single init_domain_cpu_policy(), moving the implementation into cpu-policy.c No practical change. This undoes the transient doubling of storage space from earlier patches. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> --- a/xen/arch/x86/cpu-policy.c +++ b/xen/arch/x86/cpu-policy.c @@ -1,12 +1,54 @@ /* SPDX-License-Identifier: GPL-2.0-or-later */ #include <xen/cache.h> #include <xen/kernel.h> +#include <xen/sched.h> #include <xen/lib/x86/cpu-policy.h> #include <asm/cpu-policy.h> +#include <asm/msr-index.h> +#include <asm/setup.h> struct cpu_policy __read_mostly raw_cpu_policy; struct cpu_policy __read_mostly host_cpu_policy; struct cpu_policy __read_mostly pv_max_cpu_policy; struct cpu_policy __read_mostly hvm_max_cpu_policy; + +int init_domain_cpu_policy(struct domain *d) +{ + struct cpu_policy *p = + xmemdup(is_pv_domain(d) ? &pv_max_cpu_policy + : &hvm_max_cpu_policy); + + if ( !p ) + return -ENOMEM; + + /* See comment in ctxt_switch_levelling() */ + if ( !opt_dom0_cpuid_faulting && is_control_domain(d) && is_pv_domain(d) ) + p->platform_info.cpuid_faulting = false; + + /* + * Expose the "hardware speculation behaviour" bits of ARCH_CAPS to dom0, + * so dom0 can turn off workarounds as appropriate. Temporary, until the + * domain policy logic gains a better understanding of MSRs. + */ + if ( is_hardware_domain(d) && cpu_has_arch_caps ) + { + uint64_t val; + + rdmsrl(MSR_ARCH_CAPABILITIES, val); + + p->arch_caps.raw = val & + (ARCH_CAPS_RDCL_NO | ARCH_CAPS_IBRS_ALL | ARCH_CAPS_RSBA | + ARCH_CAPS_SSB_NO | ARCH_CAPS_MDS_NO | ARCH_CAPS_IF_PSCHANGE_MC_NO | + ARCH_CAPS_TAA_NO | ARCH_CAPS_SBDR_SSDP_NO | ARCH_CAPS_FBSDP_NO | + ARCH_CAPS_PSDP_NO | ARCH_CAPS_FB_CLEAR | ARCH_CAPS_RRSBA | + ARCH_CAPS_BHI_NO | ARCH_CAPS_PBRSB_NO); + } + + d->arch.cpu_policy = p; + + recalculate_cpuid_policy(d); + + return 0; +} --- a/xen/arch/x86/cpuid.c +++ b/xen/arch/x86/cpuid.c @@ -665,22 +665,6 @@ void recalculate_cpuid_policy(struct dom p->extd.raw[0x19] = EMPTY_LEAF; } -int init_domain_cpuid_policy(struct domain *d) -{ - struct cpuid_policy *p = - xmemdup(is_pv_domain(d) ? &pv_max_cpu_policy - : &hvm_max_cpu_policy); - - if ( !p ) - return -ENOMEM; - - d->arch.cpuid = p; - - recalculate_cpuid_policy(d); - - return 0; -} - void __init init_dom0_cpuid_policy(struct domain *d) { struct cpuid_policy *p = d->arch.cpuid; --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -64,6 +64,7 @@ #include <xen/numa.h> #include <xen/iommu.h> #include <compat/vcpu.h> +#include <asm/cpu-policy.h> #include <asm/psr.h> #include <asm/pv/domain.h> #include <asm/pv/mm.h> @@ -534,8 +535,7 @@ int arch_domain_create(struct domain *d, d->arch.ctxt_switch = &idle_csw; - d->arch.cpuid = ZERO_BLOCK_PTR; /* Catch stray misuses. */ - d->arch.msr = ZERO_BLOCK_PTR; + d->arch.cpu_policy = ZERO_BLOCK_PTR; /* Catch stray misuses. */ return 0; } @@ -588,10 +588,7 @@ int arch_domain_create(struct domain *d, goto fail; paging_initialised = true; - if ( (rc = init_domain_cpuid_policy(d)) ) - goto fail; - - if ( (rc = init_domain_msr_policy(d)) ) + if ( (rc = init_domain_cpu_policy(d)) ) goto fail; d->arch.ioport_caps = @@ -660,8 +657,7 @@ int arch_domain_create(struct domain *d, iommu_domain_destroy(d); cleanup_domain_irq_mapping(d); free_xenheap_page(d->shared_info); - xfree(d->arch.cpuid); - xfree(d->arch.msr); + XFREE(d->arch.cpu_policy); if ( paging_initialised ) paging_final_teardown(d); free_perdomain_mappings(d); @@ -675,8 +671,7 @@ void arch_domain_destroy(struct domain * hvm_domain_destroy(d); xfree(d->arch.e820); - xfree(d->arch.cpuid); - xfree(d->arch.msr); + XFREE(d->arch.cpu_policy); free_domain_pirqs(d); if ( !is_idle_domain(d) ) --- a/xen/arch/x86/domctl.c +++ b/xen/arch/x86/domctl.c @@ -216,11 +216,11 @@ void domain_cpu_policy_changed(struct do static int update_domain_cpu_policy(struct domain *d, xen_domctl_cpu_policy_t *xdpc) { - struct old_cpu_policy new = {}; + struct cpu_policy *new; struct cpu_policy *sys = is_pv_domain(d) ? (IS_ENABLED(CONFIG_PV) ? &pv_max_cpu_policy : NULL) : (IS_ENABLED(CONFIG_HVM) ? &hvm_max_cpu_policy : NULL); - struct old_cpu_policy old_sys = { sys, sys }; + struct old_cpu_policy old_sys = { sys, sys }, old_new; struct cpu_policy_errors err = INIT_CPU_POLICY_ERRORS; int ret = -ENOMEM; @@ -230,33 +230,33 @@ static int update_domain_cpu_policy(stru return -EOPNOTSUPP; } - /* Start by copying the domain's existing policies. */ - if ( !(new.cpuid = xmemdup(d->arch.cpuid)) || - !(new.msr = xmemdup(d->arch.msr)) ) + /* Start by copying the domain's existing policy. */ + if ( !(new = xmemdup(d->arch.cpu_policy)) ) goto out; + old_new = (struct old_cpu_policy){ new, new }; + /* Merge the toolstack provided data. */ if ( (ret = x86_cpuid_copy_from_buffer( - new.cpuid, xdpc->leaves, xdpc->nr_leaves, + new, xdpc->leaves, xdpc->nr_leaves, &err.leaf, &err.subleaf)) || (ret = x86_msr_copy_from_buffer( - new.msr, xdpc->msrs, xdpc->nr_msrs, &err.msr)) ) + new, xdpc->msrs, xdpc->nr_msrs, &err.msr)) ) goto out; /* Trim any newly-stale out-of-range leaves. */ - x86_cpuid_policy_clear_out_of_range_leaves(new.cpuid); + x86_cpuid_policy_clear_out_of_range_leaves(new); /* Audit the combined dataset. */ - ret = x86_cpu_policies_are_compatible(&old_sys, &new, &err); + ret = x86_cpu_policies_are_compatible(&old_sys, &old_new, &err); if ( ret ) goto out; /* - * Audit was successful. Replace existing policies, leaving the old - * policies to be freed. + * Audit was successful. Replace the existing policy, leaving the old one + * to be freed. */ - SWAP(new.cpuid, d->arch.cpuid); - SWAP(new.msr, d->arch.msr); + SWAP(new, d->arch.cpu_policy); /* TODO: Drop when x86_cpu_policies_are_compatible() is completed. */ recalculate_cpuid_policy(d); @@ -265,9 +265,8 @@ static int update_domain_cpu_policy(stru domain_cpu_policy_changed(d); out: - /* Free whichever cpuid/msr structs are not installed in struct domain. */ - xfree(new.cpuid); - xfree(new.msr); + /* Free whichever struct is not installed in struct domain. */ + xfree(new); if ( ret ) { @@ -1451,7 +1450,7 @@ long arch_do_domctl( if ( guest_handle_is_null(domctl->u.cpu_policy.leaves) ) domctl->u.cpu_policy.nr_leaves = CPUID_MAX_SERIALISED_LEAVES; else if ( (ret = x86_cpuid_copy_to_buffer( - d->arch.cpuid, + d->arch.cpu_policy, domctl->u.cpu_policy.leaves, &domctl->u.cpu_policy.nr_leaves)) ) break; @@ -1460,7 +1459,7 @@ long arch_do_domctl( if ( guest_handle_is_null(domctl->u.cpu_policy.msrs) ) domctl->u.cpu_policy.nr_msrs = MSR_MAX_SERIALISED_ENTRIES; else if ( (ret = x86_msr_copy_to_buffer( - d->arch.msr, + d->arch.cpu_policy, domctl->u.cpu_policy.msrs, &domctl->u.cpu_policy.nr_msrs)) ) break; --- a/xen/arch/x86/msr.c +++ b/xen/arch/x86/msr.c @@ -97,43 +97,6 @@ void __init init_guest_msr_policy(void) calculate_pv_max_policy(); } -int init_domain_msr_policy(struct domain *d) -{ - struct msr_policy *mp = - xmemdup(is_pv_domain(d) ? &pv_max_cpu_policy - : &hvm_max_cpu_policy); - - if ( !mp ) - return -ENOMEM; - - /* See comment in ctxt_switch_levelling() */ - if ( !opt_dom0_cpuid_faulting && is_control_domain(d) && is_pv_domain(d) ) - mp->platform_info.cpuid_faulting = false; - - /* - * Expose the "hardware speculation behaviour" bits of ARCH_CAPS to dom0, - * so dom0 can turn off workarounds as appropriate. Temporary, until the - * domain policy logic gains a better understanding of MSRs. - */ - if ( is_hardware_domain(d) && boot_cpu_has(X86_FEATURE_ARCH_CAPS) ) - { - uint64_t val; - - rdmsrl(MSR_ARCH_CAPABILITIES, val); - - mp->arch_caps.raw = val & - (ARCH_CAPS_RDCL_NO | ARCH_CAPS_IBRS_ALL | ARCH_CAPS_RSBA | - ARCH_CAPS_SSB_NO | ARCH_CAPS_MDS_NO | ARCH_CAPS_IF_PSCHANGE_MC_NO | - ARCH_CAPS_TAA_NO | ARCH_CAPS_SBDR_SSDP_NO | ARCH_CAPS_FBSDP_NO | - ARCH_CAPS_PSDP_NO | ARCH_CAPS_FB_CLEAR | ARCH_CAPS_RRSBA | - ARCH_CAPS_BHI_NO | ARCH_CAPS_PBRSB_NO); - } - - d->arch.msr = mp; - - return 0; -} - int init_vcpu_msr_policy(struct vcpu *v) { struct domain *d = v->domain; --- a/xen/include/asm-x86/cpu-policy.h +++ b/xen/include/asm-x86/cpu-policy.h @@ -3,10 +3,14 @@ #define X86_CPU_POLICY_H struct cpu_policy; +struct domain; extern struct cpu_policy raw_cpu_policy; extern struct cpu_policy host_cpu_policy; extern struct cpu_policy pv_max_cpu_policy; extern struct cpu_policy hvm_max_cpu_policy; +/* Allocate and initialise a CPU policy suitable for the domain. */ +int init_domain_cpu_policy(struct domain *d); + #endif /* X86_CPU_POLICY_H */ --- a/xen/include/asm-x86/cpuid.h +++ b/xen/include/asm-x86/cpuid.h @@ -49,9 +49,6 @@ extern struct cpuidmasks cpuidmask_defau /* Check that all previously present features are still available. */ bool recheck_cpu_features(unsigned int cpu); -/* Allocate and initialise a CPUID policy suitable for the domain. */ -int init_domain_cpuid_policy(struct domain *d); - /* Apply dom0-specific tweaks to the CPUID policy. */ void init_dom0_cpuid_policy(struct domain *d); --- a/xen/include/asm-x86/domain.h +++ b/xen/include/asm-x86/domain.h @@ -356,9 +356,16 @@ struct arch_domain */ uint8_t x87_fip_width; - /* CPUID and MSR policy objects. */ - struct cpuid_policy *cpuid; - struct msr_policy *msr; + /* + * The domain's CPU Policy. "cpu_policy" is considered the canonical + * pointer, but the "cpuid" and "msr" aliases exist so the most + * appropriate one can be used for local code clarity. + */ + union { + struct cpu_policy *cpu_policy; + struct cpu_policy *cpuid; + struct cpu_policy *msr; + }; struct PITState vpit; --- a/xen/include/asm-x86/msr.h +++ b/xen/include/asm-x86/msr.h @@ -317,7 +317,6 @@ struct vcpu_msrs }; void init_guest_msr_policy(void); -int init_domain_msr_policy(struct domain *d); int init_vcpu_msr_policy(struct vcpu *v); /*
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