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xen.30330
xsa435-0-20.patch
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File xsa435-0-20.patch of Package xen.30330
From 743e530380a007774017df9dc2d8cb0659040ee3 Mon Sep 17 00:00:00 2001 From: Andrew Cooper <andrew.cooper3@citrix.com> Date: Tue, 28 Mar 2023 18:55:19 +0100 Subject: x86: Rename struct cpuid_policy to struct cpu_policy Also merge lib/x86/cpuid.h entirely into lib/x86/cpu-policy.h Use a temporary define to make struct cpuid_policy still work. There's one forward declaration of struct cpuid_policy in tools/tests/x86_emulator/x86-emulate.h that isn't covered by the define, and it's easier to rename that now than to rearrange the includes. No functional change. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> --- a/tools/fuzz/cpu-policy/afl-policy-fuzzer.c +++ b/tools/fuzz/cpu-policy/afl-policy-fuzzer.c @@ -9,7 +9,7 @@ #include <getopt.h> #include <xen-tools/libs.h> -#include <xen/lib/x86/cpuid.h> +#include <xen/lib/x86/cpu-policy.h> #include <xen/lib/x86/msr.h> #include <xen/domctl.h> --- a/tools/fuzz/x86_instruction_emulator/Makefile +++ b/tools/fuzz/x86_instruction_emulator/Makefile @@ -28,7 +28,7 @@ GCOV_FLAGS := --coverage x86.h := $(addprefix $(XEN_ROOT)/tools/include/xen/asm/,\ x86-vendors.h x86-defns.h msr-index.h) \ $(addprefix $(XEN_ROOT)/tools/include/xen/lib/x86/, \ - cpuid.h cpuid-autogen.h) + cpu-policy.h cpuid-autogen.h) x86_emulate.h := x86-emulate.h x86_emulate/x86_emulate.h $(x86.h) # x86-emulate.c will be implicit for both --- a/tools/tests/x86_emulator/Makefile +++ b/tools/tests/x86_emulator/Makefile @@ -282,7 +282,7 @@ HOSTCFLAGS += $(CFLAGS_xeninclude) -I. $ x86.h := $(addprefix $(XEN_ROOT)/tools/include/xen/asm/,\ x86-vendors.h x86-defns.h msr-index.h) \ $(addprefix $(XEN_ROOT)/tools/include/xen/lib/x86/, \ - cpuid.h cpuid-autogen.h) + cpu-policy.h cpuid-autogen.h) x86_emulate.h := x86-emulate.h x86_emulate/x86_emulate.h $(x86.h) x86-emulate.o cpuid.o test_x86_emulator.o evex-disp8.o wrappers.o: %.o: %.c $(x86_emulate.h) --- a/tools/tests/x86_emulator/x86-emulate.h +++ b/tools/tests/x86_emulator/x86-emulate.h @@ -65,7 +65,7 @@ #define is_canonical_address(x) (((int64_t)(x) >> 47) == ((int64_t)(x) >> 63)) extern uint32_t mxcsr_mask; -extern struct cpuid_policy cp; +extern struct cpu_policy cp; #define MMAP_SZ 16384 bool emul_test_init(void); --- a/xen/arch/x86/x86_emulate/x86_emulate.h +++ b/xen/arch/x86/x86_emulate/x86_emulate.h @@ -23,7 +23,7 @@ #ifndef __X86_EMULATE_H__ #define __X86_EMULATE_H__ -#include <xen/lib/x86/cpuid.h> +#include <xen/lib/x86/cpu-policy.h> #define MAX_INST_LEN 15 --- a/xen/include/asm-x86/cpuid.h +++ b/xen/include/asm-x86/cpuid.h @@ -9,7 +9,6 @@ #include <xen/percpu.h> #include <xen/lib/x86/cpu-policy.h> -#include <xen/lib/x86/cpuid.h> #include <public/sysctl.h> --- a/xen/include/xen/lib/x86/cpu-policy.h +++ b/xen/include/xen/lib/x86/cpu-policy.h @@ -2,9 +2,342 @@ #ifndef XEN_LIB_X86_POLICIES_H #define XEN_LIB_X86_POLICIES_H -#include <xen/lib/x86/cpuid.h> +#include <xen/lib/x86/cpuid-autogen.h> #include <xen/lib/x86/msr.h> +#define FEATURESET_1d 0 /* 0x00000001.edx */ +#define FEATURESET_1c 1 /* 0x00000001.ecx */ +#define FEATURESET_e1d 2 /* 0x80000001.edx */ +#define FEATURESET_e1c 3 /* 0x80000001.ecx */ +#define FEATURESET_Da1 4 /* 0x0000000d:1.eax */ +#define FEATURESET_7b0 5 /* 0x00000007:0.ebx */ +#define FEATURESET_7c0 6 /* 0x00000007:0.ecx */ +#define FEATURESET_e7d 7 /* 0x80000007.edx */ +#define FEATURESET_e8b 8 /* 0x80000008.ebx */ +#define FEATURESET_7d0 9 /* 0x00000007:0.edx */ +#define FEATURESET_7a1 10 /* 0x00000007:1.eax */ +#define FEATURESET_e21a 11 /* 0x80000021.eax */ +#define FEATURESET_7b1 12 /* 0x00000007:1.ebx */ +#define FEATURESET_7d2 13 /* 0x00000007:2.edx */ +#define FEATURESET_7c1 14 /* 0x00000007:1.ecx */ +#define FEATURESET_7d1 15 /* 0x00000007:1.edx */ + +struct cpuid_leaf +{ + uint32_t a, b, c, d; +}; + +/* + * Versions of GCC before 5 unconditionally reserve %rBX as the PIC hard + * register, and are unable to cope with spilling it. This results in a + * rather cryptic error: + * error: inconsistent operand constraints in an ‘asm’ + * + * In affected situations, work around the issue by using a separate register + * to hold the the %rBX output, and xchg twice to leave %rBX preserved around + * the asm() statement. + */ +#if defined(__PIC__) && __GNUC__ < 5 && !defined(__clang__) && defined(__i386__) +# define XCHG_BX "xchg %%ebx, %[bx];" +# define BX_CON [bx] "=&r" +#elif defined(__PIC__) && __GNUC__ < 5 && !defined(__clang__) && \ + defined(__x86_64__) && (defined(__code_model_medium__) || \ + defined(__code_model_large__)) +# define XCHG_BX "xchg %%rbx, %q[bx];" +# define BX_CON [bx] "=&r" +#else +# define XCHG_BX "" +# define BX_CON "=&b" +#endif + +static inline void cpuid_leaf(uint32_t leaf, struct cpuid_leaf *l) +{ + asm ( XCHG_BX + "cpuid;" + XCHG_BX + : "=a" (l->a), BX_CON (l->b), "=&c" (l->c), "=&d" (l->d) + : "a" (leaf) ); +} + +static inline void cpuid_count_leaf( + uint32_t leaf, uint32_t subleaf, struct cpuid_leaf *l) +{ + asm ( XCHG_BX + "cpuid;" + XCHG_BX + : "=a" (l->a), BX_CON (l->b), "=c" (l->c), "=&d" (l->d) + : "a" (leaf), "c" (subleaf) ); +} + +#undef BX_CON +#undef XCHG + +/** + * Given the vendor id from CPUID leaf 0, look up Xen's internal integer + * vendor ID. Returns X86_VENDOR_UNKNOWN for any unknown vendor. + */ +unsigned int x86_cpuid_lookup_vendor(uint32_t ebx, uint32_t ecx, uint32_t edx); + +/** + * Given Xen's internal vendor ID, return a string suitable for printing. + * Returns "Unknown" for any unrecognised ID. + */ +const char *x86_cpuid_vendor_to_str(unsigned int vendor); + +#define CPUID_GUEST_NR_BASIC (0xdu + 1) +#define CPUID_GUEST_NR_CACHE (5u + 1) +#define CPUID_GUEST_NR_FEAT (2u + 1) +#define CPUID_GUEST_NR_TOPO (1u + 1) +#define CPUID_GUEST_NR_XSTATE (62u + 1) +#define CPUID_GUEST_NR_EXTD_INTEL (0x8u + 1) +#define CPUID_GUEST_NR_EXTD_AMD (0x21u + 1) +#define CPUID_GUEST_NR_EXTD MAX(CPUID_GUEST_NR_EXTD_INTEL, \ + CPUID_GUEST_NR_EXTD_AMD) + +/* + * Maximum number of leaves a struct cpu_policy turns into when serialised for + * interaction with the toolstack. (Sum of all leaves in each union, less the + * entries in basic which sub-unions hang off of.) + */ +#define CPUID_MAX_SERIALISED_LEAVES \ + (CPUID_GUEST_NR_BASIC + \ + CPUID_GUEST_NR_FEAT - !!CPUID_GUEST_NR_FEAT + \ + CPUID_GUEST_NR_CACHE - !!CPUID_GUEST_NR_CACHE + \ + CPUID_GUEST_NR_TOPO - !!CPUID_GUEST_NR_TOPO + \ + CPUID_GUEST_NR_XSTATE - !!CPUID_GUEST_NR_XSTATE + \ + CPUID_GUEST_NR_EXTD + 2 /* hv_limit and hv2_limit */ ) + +struct cpu_policy +{ +#define DECL_BITFIELD(word) _DECL_BITFIELD(FEATURESET_ ## word) +#define _DECL_BITFIELD(x) __DECL_BITFIELD(x) +#define __DECL_BITFIELD(x) CPUID_BITFIELD_ ## x + + /* Basic leaves: 0x000000xx */ + union { + struct cpuid_leaf raw[CPUID_GUEST_NR_BASIC]; + struct { + /* Leaf 0x0 - Max and vendor. */ + uint32_t max_leaf, vendor_ebx, vendor_ecx, vendor_edx; + + /* Leaf 0x1 - Family/model/stepping and features. */ + uint32_t raw_fms; + uint8_t :8, /* Brand ID. */ + clflush_size, /* Number of 8-byte blocks per cache line. */ + lppp, /* Logical processors per package. */ + apic_id; /* Initial APIC ID. */ + union { + uint32_t _1c; + struct { DECL_BITFIELD(1c); }; + }; + union { + uint32_t _1d; + struct { DECL_BITFIELD(1d); }; + }; + + /* Leaf 0x2 - TLB/Cache/Prefetch. */ + uint8_t l2_nr_queries; /* Documented as fixed to 1. */ + uint8_t l2_desc[15]; + + uint64_t :64, :64; /* Leaf 0x3 - PSN. */ + uint64_t :64, :64; /* Leaf 0x4 - Structured Cache. */ + uint64_t :64, :64; /* Leaf 0x5 - MONITOR. */ + uint64_t :64, :64; /* Leaf 0x6 - Therm/Perf. */ + uint64_t :64, :64; /* Leaf 0x7 - Structured Features. */ + uint64_t :64, :64; /* Leaf 0x8 - rsvd */ + uint64_t :64, :64; /* Leaf 0x9 - DCA */ + + /* Leaf 0xa - Intel PMU. */ + uint8_t pmu_version, _pmu[15]; + + uint64_t :64, :64; /* Leaf 0xb - Topology. */ + uint64_t :64, :64; /* Leaf 0xc - rsvd */ + uint64_t :64, :64; /* Leaf 0xd - XSTATE. */ + }; + } basic; + + /* Structured cache leaf: 0x00000004[xx] */ + union { + struct cpuid_leaf raw[CPUID_GUEST_NR_CACHE]; + struct cpuid_cache_leaf { + uint32_t /* a */ type:5, level:3; + bool self_init:1, fully_assoc:1; + uint32_t :4, threads_per_cache:12, cores_per_package:6; + uint32_t /* b */ line_size:12, partitions:10, ways:10; + uint32_t /* c */ sets; + bool /* d */ wbinvd:1, inclusive:1, complex:1; + } subleaf[CPUID_GUEST_NR_CACHE]; + } cache; + + /* Structured feature leaf: 0x00000007[xx] */ + union { + struct cpuid_leaf raw[CPUID_GUEST_NR_FEAT]; + struct { + /* Subleaf 0. */ + uint32_t max_subleaf; + union { + uint32_t _7b0; + struct { DECL_BITFIELD(7b0); }; + }; + union { + uint32_t _7c0; + struct { DECL_BITFIELD(7c0); }; + }; + union { + uint32_t _7d0; + struct { DECL_BITFIELD(7d0); }; + }; + + /* Subleaf 1. */ + union { + uint32_t _7a1; + struct { DECL_BITFIELD(7a1); }; + }; + union { + uint32_t _7b1; + struct { DECL_BITFIELD(7b1); }; + }; + union { + uint32_t _7c1; + struct { DECL_BITFIELD(7c1); }; + }; + union { + uint32_t _7d1; + struct { DECL_BITFIELD(7d1); }; + }; + + /* Subleaf 2. */ + uint32_t /* a */:32, /* b */:32, /* c */:32; + union { + uint32_t _7d2; + struct { DECL_BITFIELD(7d2); }; + }; + }; + } feat; + + /* Extended topology enumeration: 0x0000000B[xx] */ + union { + struct cpuid_leaf raw[CPUID_GUEST_NR_TOPO]; + struct cpuid_topo_leaf { + uint32_t id_shift:5, :27; + uint16_t nr_logical, :16; + uint8_t level, type, :8, :8; + uint32_t x2apic_id; + } subleaf[CPUID_GUEST_NR_TOPO]; + } topo; + + /* Xstate feature leaf: 0x0000000D[xx] */ + union { + struct cpuid_leaf raw[CPUID_GUEST_NR_XSTATE]; + + struct { + /* Subleaf 0. */ + uint32_t xcr0_low, /* b */:32, max_size, xcr0_high; + + /* Subleaf 1. */ + union { + uint32_t Da1; + struct { DECL_BITFIELD(Da1); }; + }; + uint32_t /* b */:32, xss_low, xss_high; + }; + + /* Per-component common state. Valid for i >= 2. */ + struct { + uint32_t size, offset; + bool xss:1, align:1; + uint32_t _res_d; + } comp[CPUID_GUEST_NR_XSTATE]; + } xstate; + + /* Extended leaves: 0x800000xx */ + union { + struct cpuid_leaf raw[CPUID_GUEST_NR_EXTD]; + struct { + /* Leaf 0x80000000 - Max and vendor. */ + uint32_t max_leaf, vendor_ebx, vendor_ecx, vendor_edx; + + /* Leaf 0x80000001 - Family/model/stepping and features. */ + uint32_t raw_fms, /* b */:32; + union { + uint32_t e1c; + struct { DECL_BITFIELD(e1c); }; + }; + union { + uint32_t e1d; + struct { DECL_BITFIELD(e1d); }; + }; + + uint64_t :64, :64; /* Brand string. */ + uint64_t :64, :64; /* Brand string. */ + uint64_t :64, :64; /* Brand string. */ + uint64_t :64, :64; /* L1 cache/TLB. */ + uint64_t :64, :64; /* L2/3 cache/TLB. */ + + /* Leaf 0x80000007 - Advanced Power Management. */ + uint32_t /* a */:32, /* b */:32, /* c */:32; + union { + uint32_t e7d; + struct { DECL_BITFIELD(e7d); }; + }; + + /* Leaf 0x80000008 - Misc addr/feature info. */ + uint8_t maxphysaddr, maxlinaddr, :8, :8; + union { + uint32_t e8b; + struct { DECL_BITFIELD(e8b); }; + }; + uint32_t nc:8, :4, apic_id_size:4, :16; + uint32_t /* d */:32; + + uint64_t :64, :64; /* Leaf 0x80000009. */ + uint64_t :64, :64; /* Leaf 0x8000000a - SVM rev and features. */ + uint64_t :64, :64; /* Leaf 0x8000000b. */ + uint64_t :64, :64; /* Leaf 0x8000000c. */ + uint64_t :64, :64; /* Leaf 0x8000000d. */ + uint64_t :64, :64; /* Leaf 0x8000000e. */ + uint64_t :64, :64; /* Leaf 0x8000000f. */ + uint64_t :64, :64; /* Leaf 0x80000010. */ + uint64_t :64, :64; /* Leaf 0x80000011. */ + uint64_t :64, :64; /* Leaf 0x80000012. */ + uint64_t :64, :64; /* Leaf 0x80000013. */ + uint64_t :64, :64; /* Leaf 0x80000014. */ + uint64_t :64, :64; /* Leaf 0x80000015. */ + uint64_t :64, :64; /* Leaf 0x80000016. */ + uint64_t :64, :64; /* Leaf 0x80000017. */ + uint64_t :64, :64; /* Leaf 0x80000018. */ + uint64_t :64, :64; /* Leaf 0x80000019 - TLB 1GB Identifiers. */ + uint64_t :64, :64; /* Leaf 0x8000001a - Performance related info. */ + uint64_t :64, :64; /* Leaf 0x8000001b - IBS feature information. */ + uint64_t :64, :64; /* Leaf 0x8000001c. */ + uint64_t :64, :64; /* Leaf 0x8000001d - Cache properties. */ + uint64_t :64, :64; /* Leaf 0x8000001e - Extd APIC/Core/Node IDs. */ + uint64_t :64, :64; /* Leaf 0x8000001f - AMD Secure Encryption. */ + uint64_t :64, :64; /* Leaf 0x80000020 - Platform QoS. */ + + /* Leaf 0x80000021 - Extended Feature 2 */ + union { + uint32_t e21a; + struct { DECL_BITFIELD(e21a); }; + }; + uint32_t /* b */:32, /* c */:32, /* d */:32; + }; + } extd; + +#undef __DECL_BITFIELD +#undef _DECL_BITFIELD +#undef DECL_BITFIELD + + /* Toolstack selected Hypervisor max_leaf (if non-zero). */ + uint8_t hv_limit, hv2_limit; + + /* Value calculated from raw data above. */ + uint8_t x86_vendor; +}; + +/* Temporary */ +#define cpuid_policy cpu_policy + struct old_cpu_policy { struct cpuid_policy *cpuid; @@ -19,6 +352,134 @@ struct cpu_policy_errors #define INIT_CPU_POLICY_ERRORS { -1, -1, -1 } +/* Fill in a featureset bitmap from a CPUID policy. */ +static inline void cpuid_policy_to_featureset( + const struct cpuid_policy *p, uint32_t fs[FEATURESET_NR_ENTRIES]) +{ + fs[FEATURESET_1d] = p->basic._1d; + fs[FEATURESET_1c] = p->basic._1c; + fs[FEATURESET_e1d] = p->extd.e1d; + fs[FEATURESET_e1c] = p->extd.e1c; + fs[FEATURESET_Da1] = p->xstate.Da1; + fs[FEATURESET_7b0] = p->feat._7b0; + fs[FEATURESET_7c0] = p->feat._7c0; + fs[FEATURESET_e7d] = p->extd.e7d; + fs[FEATURESET_e8b] = p->extd.e8b; + fs[FEATURESET_7d0] = p->feat._7d0; + fs[FEATURESET_7a1] = p->feat._7a1; + fs[FEATURESET_e21a] = p->extd.e21a; + fs[FEATURESET_7b1] = p->feat._7b1; + fs[FEATURESET_7d2] = p->feat._7d2; + fs[FEATURESET_7c1] = p->feat._7c1; + fs[FEATURESET_7d1] = p->feat._7d1; +} + +/* Fill in a CPUID policy from a featureset bitmap. */ +static inline void cpuid_featureset_to_policy( + const uint32_t fs[FEATURESET_NR_ENTRIES], struct cpuid_policy *p) +{ + p->basic._1d = fs[FEATURESET_1d]; + p->basic._1c = fs[FEATURESET_1c]; + p->extd.e1d = fs[FEATURESET_e1d]; + p->extd.e1c = fs[FEATURESET_e1c]; + p->xstate.Da1 = fs[FEATURESET_Da1]; + p->feat._7b0 = fs[FEATURESET_7b0]; + p->feat._7c0 = fs[FEATURESET_7c0]; + p->extd.e7d = fs[FEATURESET_e7d]; + p->extd.e8b = fs[FEATURESET_e8b]; + p->feat._7d0 = fs[FEATURESET_7d0]; + p->feat._7a1 = fs[FEATURESET_7a1]; + p->extd.e21a = fs[FEATURESET_e21a]; + p->feat._7b1 = fs[FEATURESET_7b1]; + p->feat._7d2 = fs[FEATURESET_7d2]; + p->feat._7c1 = fs[FEATURESET_7c1]; + p->feat._7d1 = fs[FEATURESET_7d1]; +} + +static inline uint64_t cpuid_policy_xcr0_max(const struct cpuid_policy *p) +{ + return ((uint64_t)p->xstate.xcr0_high << 32) | p->xstate.xcr0_low; +} + +static inline uint64_t cpuid_policy_xstates(const struct cpuid_policy *p) +{ + uint64_t val = p->xstate.xcr0_high | p->xstate.xss_high; + + return (val << 32) | p->xstate.xcr0_low | p->xstate.xss_low; +} + +const uint32_t *x86_cpuid_lookup_deep_deps(uint32_t feature); + +/** + * Recalculate the content in a CPUID policy which is derived from raw data. + */ +void x86_cpuid_policy_recalc_synth(struct cpuid_policy *p); + +/** + * Fill a CPUID policy using the native CPUID instruction. + * + * No sanitisation is performed, but synthesised values are calculated. + * Values may be influenced by a hypervisor or from masking/faulting + * configuration. + */ +void x86_cpuid_policy_fill_native(struct cpuid_policy *p); + +/** + * Clear leaf data beyond the policies max leaf/subleaf settings. + * + * Policy serialisation purposefully omits out-of-range leaves, because there + * are a large number of them due to vendor differences. However, when + * constructing new policies (e.g. levelling down), it is possible to end up + * with out-of-range leaves with stale content in them. This helper clears + * them. + */ +void x86_cpuid_policy_clear_out_of_range_leaves(struct cpuid_policy *p); + +#ifdef __XEN__ +#include <public/arch-x86/xen.h> +typedef XEN_GUEST_HANDLE_64(xen_cpuid_leaf_t) cpuid_leaf_buffer_t; +#else +#include <xen/arch-x86/xen.h> +typedef xen_cpuid_leaf_t cpuid_leaf_buffer_t[]; +#endif + +/** + * Serialise a cpuid_policy object into an array of cpuid leaves. + * + * @param policy The cpuid_policy to serialise. + * @param leaves The array of leaves to serialise into. + * @param nr_entries The number of entries in 'leaves'. + * @returns -errno + * + * Writes at most CPUID_MAX_SERIALISED_LEAVES. May fail with -ENOBUFS if the + * leaves array is too short. On success, nr_entries is updated with the + * actual number of leaves written. + */ +int x86_cpuid_copy_to_buffer(const struct cpuid_policy *policy, + cpuid_leaf_buffer_t leaves, uint32_t *nr_entries); + +/** + * Unserialise a cpuid_policy object from an array of cpuid leaves. + * + * @param policy The cpuid_policy to unserialise into. + * @param leaves The array of leaves to unserialise from. + * @param nr_entries The number of entries in 'leaves'. + * @param err_leaf Optional hint for error diagnostics. + * @param err_subleaf Optional hint for error diagnostics. + * @returns -errno + * + * Reads at most CPUID_MAX_SERIALISED_LEAVES. May return -ERANGE if an + * incoming leaf is out of range of cpuid_policy, in which case the optional + * err_* pointers will identify the out-of-range indicies. + * + * No content validation of in-range leaves is performed. Synthesised data is + * recalculated. + */ +int x86_cpuid_copy_from_buffer(struct cpuid_policy *policy, + const cpuid_leaf_buffer_t leaves, + uint32_t nr_entries, uint32_t *err_leaf, + uint32_t *err_subleaf); + /* * Calculate whether two policies are compatible. * --- a/xen/include/xen/lib/x86/cpuid.h +++ /dev/null @@ -1,475 +0,0 @@ -/* Common data structures and functions consumed by hypervisor and toolstack */ -#ifndef XEN_LIB_X86_CPUID_H -#define XEN_LIB_X86_CPUID_H - -#include <xen/lib/x86/cpuid-autogen.h> - -#define FEATURESET_1d 0 /* 0x00000001.edx */ -#define FEATURESET_1c 1 /* 0x00000001.ecx */ -#define FEATURESET_e1d 2 /* 0x80000001.edx */ -#define FEATURESET_e1c 3 /* 0x80000001.ecx */ -#define FEATURESET_Da1 4 /* 0x0000000d:1.eax */ -#define FEATURESET_7b0 5 /* 0x00000007:0.ebx */ -#define FEATURESET_7c0 6 /* 0x00000007:0.ecx */ -#define FEATURESET_e7d 7 /* 0x80000007.edx */ -#define FEATURESET_e8b 8 /* 0x80000008.ebx */ -#define FEATURESET_7d0 9 /* 0x00000007:0.edx */ -#define FEATURESET_7a1 10 /* 0x00000007:1.eax */ -#define FEATURESET_e21a 11 /* 0x80000021.eax */ -#define FEATURESET_7b1 12 /* 0x00000007:1.ebx */ -#define FEATURESET_7d2 13 /* 0x00000007:2.edx */ -#define FEATURESET_7c1 14 /* 0x00000007:1.ecx */ -#define FEATURESET_7d1 15 /* 0x00000007:1.edx */ - -struct cpuid_leaf -{ - uint32_t a, b, c, d; -}; - -/* - * Versions of GCC before 5 unconditionally reserve %rBX as the PIC hard - * register, and are unable to cope with spilling it. This results in a - * rather cryptic error: - * error: inconsistent operand constraints in an ‘asm’ - * - * In affected situations, work around the issue by using a separate register - * to hold the the %rBX output, and xchg twice to leave %rBX preserved around - * the asm() statement. - */ -#if defined(__PIC__) && __GNUC__ < 5 && !defined(__clang__) && defined(__i386__) -# define XCHG_BX "xchg %%ebx, %[bx];" -# define BX_CON [bx] "=&r" -#elif defined(__PIC__) && __GNUC__ < 5 && !defined(__clang__) && \ - defined(__x86_64__) && (defined(__code_model_medium__) || \ - defined(__code_model_large__)) -# define XCHG_BX "xchg %%rbx, %q[bx];" -# define BX_CON [bx] "=&r" -#else -# define XCHG_BX "" -# define BX_CON "=&b" -#endif - -static inline void cpuid_leaf(uint32_t leaf, struct cpuid_leaf *l) -{ - asm ( XCHG_BX - "cpuid;" - XCHG_BX - : "=a" (l->a), BX_CON (l->b), "=&c" (l->c), "=&d" (l->d) - : "a" (leaf) ); -} - -static inline void cpuid_count_leaf( - uint32_t leaf, uint32_t subleaf, struct cpuid_leaf *l) -{ - asm ( XCHG_BX - "cpuid;" - XCHG_BX - : "=a" (l->a), BX_CON (l->b), "=c" (l->c), "=&d" (l->d) - : "a" (leaf), "c" (subleaf) ); -} - -#undef BX_CON -#undef XCHG - -/** - * Given the vendor id from CPUID leaf 0, look up Xen's internal integer - * vendor ID. Returns X86_VENDOR_UNKNOWN for any unknown vendor. - */ -unsigned int x86_cpuid_lookup_vendor(uint32_t ebx, uint32_t ecx, uint32_t edx); - -/** - * Given Xen's internal vendor ID, return a string suitable for printing. - * Returns "Unknown" for any unrecognised ID. - */ -const char *x86_cpuid_vendor_to_str(unsigned int vendor); - -#define CPUID_GUEST_NR_BASIC (0xdu + 1) -#define CPUID_GUEST_NR_CACHE (5u + 1) -#define CPUID_GUEST_NR_FEAT (2u + 1) -#define CPUID_GUEST_NR_TOPO (1u + 1) -#define CPUID_GUEST_NR_XSTATE (62u + 1) -#define CPUID_GUEST_NR_EXTD_INTEL (0x8u + 1) -#define CPUID_GUEST_NR_EXTD_AMD (0x21u + 1) -#define CPUID_GUEST_NR_EXTD MAX(CPUID_GUEST_NR_EXTD_INTEL, \ - CPUID_GUEST_NR_EXTD_AMD) - -/* - * Maximum number of leaves a struct cpuid_policy turns into when serialised - * for interaction with the toolstack. (Sum of all leaves in each union, less - * the entries in basic which sub-unions hang off of.) - */ -#define CPUID_MAX_SERIALISED_LEAVES \ - (CPUID_GUEST_NR_BASIC + \ - CPUID_GUEST_NR_FEAT - !!CPUID_GUEST_NR_FEAT + \ - CPUID_GUEST_NR_CACHE - !!CPUID_GUEST_NR_CACHE + \ - CPUID_GUEST_NR_TOPO - !!CPUID_GUEST_NR_TOPO + \ - CPUID_GUEST_NR_XSTATE - !!CPUID_GUEST_NR_XSTATE + \ - CPUID_GUEST_NR_EXTD + 2 /* hv_limit and hv2_limit */ ) - -struct cpuid_policy -{ -#define DECL_BITFIELD(word) _DECL_BITFIELD(FEATURESET_ ## word) -#define _DECL_BITFIELD(x) __DECL_BITFIELD(x) -#define __DECL_BITFIELD(x) CPUID_BITFIELD_ ## x - - /* Basic leaves: 0x000000xx */ - union { - struct cpuid_leaf raw[CPUID_GUEST_NR_BASIC]; - struct { - /* Leaf 0x0 - Max and vendor. */ - uint32_t max_leaf, vendor_ebx, vendor_ecx, vendor_edx; - - /* Leaf 0x1 - Family/model/stepping and features. */ - uint32_t raw_fms; - uint8_t :8, /* Brand ID. */ - clflush_size, /* Number of 8-byte blocks per cache line. */ - lppp, /* Logical processors per package. */ - apic_id; /* Initial APIC ID. */ - union { - uint32_t _1c; - struct { DECL_BITFIELD(1c); }; - }; - union { - uint32_t _1d; - struct { DECL_BITFIELD(1d); }; - }; - - /* Leaf 0x2 - TLB/Cache/Prefetch. */ - uint8_t l2_nr_queries; /* Documented as fixed to 1. */ - uint8_t l2_desc[15]; - - uint64_t :64, :64; /* Leaf 0x3 - PSN. */ - uint64_t :64, :64; /* Leaf 0x4 - Structured Cache. */ - uint64_t :64, :64; /* Leaf 0x5 - MONITOR. */ - uint64_t :64, :64; /* Leaf 0x6 - Therm/Perf. */ - uint64_t :64, :64; /* Leaf 0x7 - Structured Features. */ - uint64_t :64, :64; /* Leaf 0x8 - rsvd */ - uint64_t :64, :64; /* Leaf 0x9 - DCA */ - - /* Leaf 0xa - Intel PMU. */ - uint8_t pmu_version, _pmu[15]; - - uint64_t :64, :64; /* Leaf 0xb - Topology. */ - uint64_t :64, :64; /* Leaf 0xc - rsvd */ - uint64_t :64, :64; /* Leaf 0xd - XSTATE. */ - }; - } basic; - - /* Structured cache leaf: 0x00000004[xx] */ - union { - struct cpuid_leaf raw[CPUID_GUEST_NR_CACHE]; - struct cpuid_cache_leaf { - uint32_t /* a */ type:5, level:3; - bool self_init:1, fully_assoc:1; - uint32_t :4, threads_per_cache:12, cores_per_package:6; - uint32_t /* b */ line_size:12, partitions:10, ways:10; - uint32_t /* c */ sets; - bool /* d */ wbinvd:1, inclusive:1, complex:1; - } subleaf[CPUID_GUEST_NR_CACHE]; - } cache; - - /* Structured feature leaf: 0x00000007[xx] */ - union { - struct cpuid_leaf raw[CPUID_GUEST_NR_FEAT]; - struct { - /* Subleaf 0. */ - uint32_t max_subleaf; - union { - uint32_t _7b0; - struct { DECL_BITFIELD(7b0); }; - }; - union { - uint32_t _7c0; - struct { DECL_BITFIELD(7c0); }; - }; - union { - uint32_t _7d0; - struct { DECL_BITFIELD(7d0); }; - }; - - /* Subleaf 1. */ - union { - uint32_t _7a1; - struct { DECL_BITFIELD(7a1); }; - }; - union { - uint32_t _7b1; - struct { DECL_BITFIELD(7b1); }; - }; - union { - uint32_t _7c1; - struct { DECL_BITFIELD(7c1); }; - }; - union { - uint32_t _7d1; - struct { DECL_BITFIELD(7d1); }; - }; - - /* Subleaf 2. */ - uint32_t /* a */:32, /* b */:32, /* c */:32; - union { - uint32_t _7d2; - struct { DECL_BITFIELD(7d2); }; - }; - }; - } feat; - - /* Extended topology enumeration: 0x0000000B[xx] */ - union { - struct cpuid_leaf raw[CPUID_GUEST_NR_TOPO]; - struct cpuid_topo_leaf { - uint32_t id_shift:5, :27; - uint16_t nr_logical, :16; - uint8_t level, type, :8, :8; - uint32_t x2apic_id; - } subleaf[CPUID_GUEST_NR_TOPO]; - } topo; - - /* Xstate feature leaf: 0x0000000D[xx] */ - union { - struct cpuid_leaf raw[CPUID_GUEST_NR_XSTATE]; - - struct { - /* Subleaf 0. */ - uint32_t xcr0_low, /* b */:32, max_size, xcr0_high; - - /* Subleaf 1. */ - union { - uint32_t Da1; - struct { DECL_BITFIELD(Da1); }; - }; - uint32_t /* b */:32, xss_low, xss_high; - }; - - /* Per-component common state. Valid for i >= 2. */ - struct { - uint32_t size, offset; - bool xss:1, align:1; - uint32_t _res_d; - } comp[CPUID_GUEST_NR_XSTATE]; - } xstate; - - /* Extended leaves: 0x800000xx */ - union { - struct cpuid_leaf raw[CPUID_GUEST_NR_EXTD]; - struct { - /* Leaf 0x80000000 - Max and vendor. */ - uint32_t max_leaf, vendor_ebx, vendor_ecx, vendor_edx; - - /* Leaf 0x80000001 - Family/model/stepping and features. */ - uint32_t raw_fms, /* b */:32; - union { - uint32_t e1c; - struct { DECL_BITFIELD(e1c); }; - }; - union { - uint32_t e1d; - struct { DECL_BITFIELD(e1d); }; - }; - - uint64_t :64, :64; /* Brand string. */ - uint64_t :64, :64; /* Brand string. */ - uint64_t :64, :64; /* Brand string. */ - uint64_t :64, :64; /* L1 cache/TLB. */ - uint64_t :64, :64; /* L2/3 cache/TLB. */ - - /* Leaf 0x80000007 - Advanced Power Management. */ - uint32_t /* a */:32, /* b */:32, /* c */:32; - union { - uint32_t e7d; - struct { DECL_BITFIELD(e7d); }; - }; - - /* Leaf 0x80000008 - Misc addr/feature info. */ - uint8_t maxphysaddr, maxlinaddr, :8, :8; - union { - uint32_t e8b; - struct { DECL_BITFIELD(e8b); }; - }; - uint32_t nc:8, :4, apic_id_size:4, :16; - uint32_t /* d */:32; - - uint64_t :64, :64; /* Leaf 0x80000009. */ - uint64_t :64, :64; /* Leaf 0x8000000a - SVM rev and features. */ - uint64_t :64, :64; /* Leaf 0x8000000b. */ - uint64_t :64, :64; /* Leaf 0x8000000c. */ - uint64_t :64, :64; /* Leaf 0x8000000d. */ - uint64_t :64, :64; /* Leaf 0x8000000e. */ - uint64_t :64, :64; /* Leaf 0x8000000f. */ - uint64_t :64, :64; /* Leaf 0x80000010. */ - uint64_t :64, :64; /* Leaf 0x80000011. */ - uint64_t :64, :64; /* Leaf 0x80000012. */ - uint64_t :64, :64; /* Leaf 0x80000013. */ - uint64_t :64, :64; /* Leaf 0x80000014. */ - uint64_t :64, :64; /* Leaf 0x80000015. */ - uint64_t :64, :64; /* Leaf 0x80000016. */ - uint64_t :64, :64; /* Leaf 0x80000017. */ - uint64_t :64, :64; /* Leaf 0x80000018. */ - uint64_t :64, :64; /* Leaf 0x80000019 - TLB 1GB Identifiers. */ - uint64_t :64, :64; /* Leaf 0x8000001a - Performance related info. */ - uint64_t :64, :64; /* Leaf 0x8000001b - IBS feature information. */ - uint64_t :64, :64; /* Leaf 0x8000001c. */ - uint64_t :64, :64; /* Leaf 0x8000001d - Cache properties. */ - uint64_t :64, :64; /* Leaf 0x8000001e - Extd APIC/Core/Node IDs. */ - uint64_t :64, :64; /* Leaf 0x8000001f - AMD Secure Encryption. */ - uint64_t :64, :64; /* Leaf 0x80000020 - Platform QoS. */ - - /* Leaf 0x80000021 - Extended Feature 2 */ - union { - uint32_t e21a; - struct { DECL_BITFIELD(e21a); }; - }; - uint32_t /* b */:32, /* c */:32, /* d */:32; - }; - } extd; - -#undef __DECL_BITFIELD -#undef _DECL_BITFIELD -#undef DECL_BITFIELD - - /* Toolstack selected Hypervisor max_leaf (if non-zero). */ - uint8_t hv_limit, hv2_limit; - - /* Value calculated from raw data above. */ - uint8_t x86_vendor; -}; - -/* Fill in a featureset bitmap from a CPUID policy. */ -static inline void cpuid_policy_to_featureset( - const struct cpuid_policy *p, uint32_t fs[FEATURESET_NR_ENTRIES]) -{ - fs[FEATURESET_1d] = p->basic._1d; - fs[FEATURESET_1c] = p->basic._1c; - fs[FEATURESET_e1d] = p->extd.e1d; - fs[FEATURESET_e1c] = p->extd.e1c; - fs[FEATURESET_Da1] = p->xstate.Da1; - fs[FEATURESET_7b0] = p->feat._7b0; - fs[FEATURESET_7c0] = p->feat._7c0; - fs[FEATURESET_e7d] = p->extd.e7d; - fs[FEATURESET_e8b] = p->extd.e8b; - fs[FEATURESET_7d0] = p->feat._7d0; - fs[FEATURESET_7a1] = p->feat._7a1; - fs[FEATURESET_e21a] = p->extd.e21a; - fs[FEATURESET_7b1] = p->feat._7b1; - fs[FEATURESET_7d2] = p->feat._7d2; - fs[FEATURESET_7c1] = p->feat._7c1; - fs[FEATURESET_7d1] = p->feat._7d1; -} - -/* Fill in a CPUID policy from a featureset bitmap. */ -static inline void cpuid_featureset_to_policy( - const uint32_t fs[FEATURESET_NR_ENTRIES], struct cpuid_policy *p) -{ - p->basic._1d = fs[FEATURESET_1d]; - p->basic._1c = fs[FEATURESET_1c]; - p->extd.e1d = fs[FEATURESET_e1d]; - p->extd.e1c = fs[FEATURESET_e1c]; - p->xstate.Da1 = fs[FEATURESET_Da1]; - p->feat._7b0 = fs[FEATURESET_7b0]; - p->feat._7c0 = fs[FEATURESET_7c0]; - p->extd.e7d = fs[FEATURESET_e7d]; - p->extd.e8b = fs[FEATURESET_e8b]; - p->feat._7d0 = fs[FEATURESET_7d0]; - p->feat._7a1 = fs[FEATURESET_7a1]; - p->extd.e21a = fs[FEATURESET_e21a]; - p->feat._7b1 = fs[FEATURESET_7b1]; - p->feat._7d2 = fs[FEATURESET_7d2]; - p->feat._7c1 = fs[FEATURESET_7c1]; - p->feat._7d1 = fs[FEATURESET_7d1]; -} - -static inline uint64_t cpuid_policy_xcr0_max(const struct cpuid_policy *p) -{ - return ((uint64_t)p->xstate.xcr0_high << 32) | p->xstate.xcr0_low; -} - -static inline uint64_t cpuid_policy_xstates(const struct cpuid_policy *p) -{ - uint64_t val = p->xstate.xcr0_high | p->xstate.xss_high; - - return (val << 32) | p->xstate.xcr0_low | p->xstate.xss_low; -} - -const uint32_t *x86_cpuid_lookup_deep_deps(uint32_t feature); - -/** - * Recalculate the content in a CPUID policy which is derived from raw data. - */ -void x86_cpuid_policy_recalc_synth(struct cpuid_policy *p); - -/** - * Fill a CPUID policy using the native CPUID instruction. - * - * No sanitisation is performed, but synthesised values are calculated. - * Values may be influenced by a hypervisor or from masking/faulting - * configuration. - */ -void x86_cpuid_policy_fill_native(struct cpuid_policy *p); - -/** - * Clear leaf data beyond the policies max leaf/subleaf settings. - * - * Policy serialisation purposefully omits out-of-range leaves, because there - * are a large number of them due to vendor differences. However, when - * constructing new policies (e.g. levelling down), it is possible to end up - * with out-of-range leaves with stale content in them. This helper clears - * them. - */ -void x86_cpuid_policy_clear_out_of_range_leaves(struct cpuid_policy *p); - -#ifdef __XEN__ -#include <public/arch-x86/xen.h> -typedef XEN_GUEST_HANDLE_64(xen_cpuid_leaf_t) cpuid_leaf_buffer_t; -#else -#include <xen/arch-x86/xen.h> -typedef xen_cpuid_leaf_t cpuid_leaf_buffer_t[]; -#endif - -/** - * Serialise a cpuid_policy object into an array of cpuid leaves. - * - * @param policy The cpuid_policy to serialise. - * @param leaves The array of leaves to serialise into. - * @param nr_entries The number of entries in 'leaves'. - * @returns -errno - * - * Writes at most CPUID_MAX_SERIALISED_LEAVES. May fail with -ENOBUFS if the - * leaves array is too short. On success, nr_entries is updated with the - * actual number of leaves written. - */ -int x86_cpuid_copy_to_buffer(const struct cpuid_policy *policy, - cpuid_leaf_buffer_t leaves, uint32_t *nr_entries); - -/** - * Unserialise a cpuid_policy object from an array of cpuid leaves. - * - * @param policy The cpuid_policy to unserialise into. - * @param leaves The array of leaves to unserialise from. - * @param nr_entries The number of entries in 'leaves'. - * @param err_leaf Optional hint for error diagnostics. - * @param err_subleaf Optional hint for error diagnostics. - * @returns -errno - * - * Reads at most CPUID_MAX_SERIALISED_LEAVES. May return -ERANGE if an - * incoming leaf is out of range of cpuid_policy, in which case the optional - * err_* pointers will identify the out-of-range indicies. - * - * No content validation of in-range leaves is performed. Synthesised data is - * recalculated. - */ -int x86_cpuid_copy_from_buffer(struct cpuid_policy *policy, - const cpuid_leaf_buffer_t leaves, - uint32_t nr_entries, uint32_t *err_leaf, - uint32_t *err_subleaf); - -#endif /* !XEN_LIB_X86_CPUID_H */ - -/* - * Local variables: - * mode: C - * c-file-style: "BSD" - * c-basic-offset: 4 - * tab-width: 4 - * indent-tabs-mode: nil - * End: - */ --- a/xen/lib/x86/cpuid.c +++ b/xen/lib/x86/cpuid.c @@ -1,6 +1,6 @@ #include "private.h" -#include <xen/lib/x86/cpuid.h> +#include <xen/lib/x86/cpu-policy.h> static void zero_leaves(struct cpuid_leaf *l, unsigned int first, unsigned int last)
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