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Additionally, use host policy rather than featureset when preparing the cur policy, saving one hypercall and several lines of boilerplate. No functional change intended. Signed-off-by: Alejandro Vallejo --- v2: * Cosmetic change to comment (// into /**/). * Added missing null pointer check to MSR override function. --- tools/libs/guest/xg_cpuid_x86.c | 445 ++++++++++---------------------- 1 file changed, 130 insertions(+), 315 deletions(-) diff --git a/tools/libs/guest/xg_cpuid_x86.c b/tools/libs/guest/xg_cpuid_x86.c index 4f4b86b59470..74bca0e65b69 100644 --- a/tools/libs/guest/xg_cpuid_x86.c +++ b/tools/libs/guest/xg_cpuid_x86.c @@ -36,6 +36,34 @@ enum { #define bitmaskof(idx) (1u << ((idx) & 31)) #define featureword_of(idx) ((idx) >> 5) +static int deserialize_policy(xc_interface *xch, xc_cpu_policy_t *policy) +{ + uint32_t err_leaf = -1, err_subleaf = -1, err_msr = -1; + int rc; + + rc = x86_cpuid_copy_from_buffer(&policy->policy, policy->leaves, + policy->nr_leaves, &err_leaf, &err_subleaf); + if ( rc ) + { + if ( err_leaf != -1 ) + ERROR("Failed to deserialise CPUID (err leaf %#x, subleaf %#x) (%d = %s)", + err_leaf, err_subleaf, -rc, strerror(-rc)); + return rc; + } + + rc = x86_msr_copy_from_buffer(&policy->policy, policy->msrs, + policy->nr_msrs, &err_msr); + if ( rc ) + { + if ( err_msr != -1 ) + ERROR("Failed to deserialise MSR (err MSR %#x) (%d = %s)", + err_msr, -rc, strerror(-rc)); + return rc; + } + + return 0; +} + int xc_get_cpu_levelling_caps(xc_interface *xch, uint32_t *caps) { struct xen_sysctl sysctl = {}; @@ -260,102 +288,34 @@ static int compare_leaves(const void *l, const void *r) return 0; } -static xen_cpuid_leaf_t *find_leaf( - xen_cpuid_leaf_t *leaves, unsigned int nr_leaves, - const struct xc_xend_cpuid *xend) +static xen_cpuid_leaf_t *find_leaf(xc_cpu_policy_t *p, + const struct xc_xend_cpuid *xend) { const xen_cpuid_leaf_t key = { xend->leaf, xend->subleaf }; - return bsearch(&key, leaves, nr_leaves, sizeof(*leaves), compare_leaves); + return bsearch(&key, p->leaves, ARRAY_SIZE(p->leaves), + sizeof(*p->leaves), compare_leaves); } -static int xc_cpuid_xend_policy( - xc_interface *xch, uint32_t domid, const struct xc_xend_cpuid *xend) +static int xc_cpuid_xend_policy(xc_interface *xch, uint32_t domid, + const struct xc_xend_cpuid *xend, + xc_cpu_policy_t *host, + xc_cpu_policy_t *def, + xc_cpu_policy_t *cur) { - int rc; - bool hvm; - xc_domaininfo_t di; - unsigned int nr_leaves, nr_msrs; - uint32_t err_leaf = -1, err_subleaf = -1, err_msr = -1; - /* - * Three full policies. The host, default for the domain type, - * and domain current. - */ - xen_cpuid_leaf_t *host = NULL, *def = NULL, *cur = NULL; - unsigned int nr_host, nr_def, nr_cur; - - if ( (rc = xc_domain_getinfo_single(xch, domid, &di)) < 0 ) - { - PERROR("Failed to obtain d%d info", domid); - rc = -errno; - goto fail; - } - hvm = di.flags & XEN_DOMINF_hvm_guest; - - rc = xc_cpu_policy_get_size(xch, &nr_leaves, &nr_msrs); - if ( rc ) - { - PERROR("Failed to obtain policy info size"); - rc = -errno; - goto fail; - } - - rc = -ENOMEM; - if ( (host = calloc(nr_leaves, sizeof(*host))) == NULL || - (def = calloc(nr_leaves, sizeof(*def))) == NULL || - (cur = calloc(nr_leaves, sizeof(*cur))) == NULL ) - { - ERROR("Unable to allocate memory for %u CPUID leaves", nr_leaves); - goto fail; - } - - /* Get the domain's current policy. */ - nr_msrs = 0; - nr_cur = nr_leaves; - rc = get_domain_cpu_policy(xch, domid, &nr_cur, cur, &nr_msrs, NULL); - if ( rc ) - { - PERROR("Failed to obtain d%d current policy", domid); - rc = -errno; - goto fail; - } - - /* Get the domain type's default policy. */ - nr_msrs = 0; - nr_def = nr_leaves; - rc = get_system_cpu_policy(xch, hvm ? XEN_SYSCTL_cpu_policy_hvm_default - : XEN_SYSCTL_cpu_policy_pv_default, - &nr_def, def, &nr_msrs, NULL); - if ( rc ) - { - PERROR("Failed to obtain %s def policy", hvm ? "hvm" : "pv"); - rc = -errno; - goto fail; - } - - /* Get the host policy. */ - nr_msrs = 0; - nr_host = nr_leaves; - rc = get_system_cpu_policy(xch, XEN_SYSCTL_cpu_policy_host, - &nr_host, host, &nr_msrs, NULL); - if ( rc ) - { - PERROR("Failed to obtain host policy"); - rc = -errno; - goto fail; - } + if ( !xend ) + return 0; - rc = -EINVAL; for ( ; xend->leaf != XEN_CPUID_INPUT_UNUSED; ++xend ) { - xen_cpuid_leaf_t *cur_leaf = find_leaf(cur, nr_cur, xend); - const xen_cpuid_leaf_t *def_leaf = find_leaf(def, nr_def, xend); - const xen_cpuid_leaf_t *host_leaf = find_leaf(host, nr_host, xend); + xen_cpuid_leaf_t *cur_leaf = find_leaf(cur, xend); + const xen_cpuid_leaf_t *def_leaf = find_leaf(def, xend); + const xen_cpuid_leaf_t *host_leaf = find_leaf(host, xend); if ( cur_leaf == NULL || def_leaf == NULL || host_leaf == NULL ) { ERROR("Missing leaf %#x, subleaf %#x", xend->leaf, xend->subleaf); - goto fail; + return -EINVAL; } for ( unsigned int i = 0; i < ARRAY_SIZE(xend->policy); i++ ) @@ -384,7 +344,7 @@ static int xc_cpuid_xend_policy( { ERROR("Bad character '%c' in policy[%d] string '%s'", xend->policy[i][j], i, xend->policy[i]); - goto fail; + return -EINVAL; } clear_bit(31 - j, cur_reg); @@ -394,25 +354,7 @@ static int xc_cpuid_xend_policy( } } - /* Feed the transformed currrent policy back up to Xen. */ - rc = xc_set_domain_cpu_policy(xch, domid, nr_cur, cur, 0, NULL, - &err_leaf, &err_subleaf, &err_msr); - if ( rc ) - { - PERROR("Failed to set d%d's policy (err leaf %#x, subleaf %#x, msr %#x)", - domid, err_leaf, err_subleaf, err_msr); - rc = -errno; - goto fail; - } - - /* Success! */ - - fail: - free(cur); - free(def); - free(host); - - return rc; + return 0; } static int compare_msr(const void *l, const void *r) @@ -426,107 +368,37 @@ static int compare_msr(const void *l, const void *r) return lhs->idx < rhs->idx ? -1 : 1; } -static xen_msr_entry_t *find_msr( - xen_msr_entry_t *msrs, unsigned int nr_msrs, - uint32_t index) +static xen_msr_entry_t *find_msr(xc_cpu_policy_t *p, + uint32_t index) { const xen_msr_entry_t key = { .idx = index }; - return bsearch(&key, msrs, nr_msrs, sizeof(*msrs), compare_msr); + return bsearch(&key, p->msrs, ARRAY_SIZE(p->msrs), + sizeof(*p->msrs), compare_msr); } - static int xc_msr_policy(xc_interface *xch, domid_t domid, - const struct xc_msr *msr) + const struct xc_msr *msr, + xc_cpu_policy_t *host, + xc_cpu_policy_t *def, + xc_cpu_policy_t *cur) { - int rc; - bool hvm; - xc_domaininfo_t di; - unsigned int nr_leaves, nr_msrs; - uint32_t err_leaf = -1, err_subleaf = -1, err_msr = -1; - /* - * Three full policies. The host, default for the domain type, - * and domain current. - */ - xen_msr_entry_t *host = NULL, *def = NULL, *cur = NULL; - unsigned int nr_host, nr_def, nr_cur; - - if ( (rc = xc_domain_getinfo_single(xch, domid, &di)) < 0 ) - { - PERROR("Failed to obtain d%d info", domid); - rc = -errno; - goto out; - } - hvm = di.flags & XEN_DOMINF_hvm_guest; - - rc = xc_cpu_policy_get_size(xch, &nr_leaves, &nr_msrs); - if ( rc ) - { - PERROR("Failed to obtain policy info size"); - rc = -errno; - goto out; - } - - if ( (host = calloc(nr_msrs, sizeof(*host))) == NULL || - (def = calloc(nr_msrs, sizeof(*def))) == NULL || - (cur = calloc(nr_msrs, sizeof(*cur))) == NULL ) - { - ERROR("Unable to allocate memory for %u CPUID leaves", nr_leaves); - rc = -ENOMEM; - goto out; - } - - /* Get the domain's current policy. */ - nr_leaves = 0; - nr_cur = nr_msrs; - rc = get_domain_cpu_policy(xch, domid, &nr_leaves, NULL, &nr_cur, cur); - if ( rc ) - { - PERROR("Failed to obtain d%d current policy", domid); - rc = -errno; - goto out; - } - - /* Get the domain type's default policy. */ - nr_leaves = 0; - nr_def = nr_msrs; - rc = get_system_cpu_policy(xch, hvm ? XEN_SYSCTL_cpu_policy_hvm_default - : XEN_SYSCTL_cpu_policy_pv_default, - &nr_leaves, NULL, &nr_def, def); - if ( rc ) - { - PERROR("Failed to obtain %s def policy", hvm ? "hvm" : "pv"); - rc = -errno; - goto out; - } - - /* Get the host policy. */ - nr_leaves = 0; - nr_host = nr_msrs; - rc = get_system_cpu_policy(xch, XEN_SYSCTL_cpu_policy_host, - &nr_leaves, NULL, &nr_host, host); - if ( rc ) - { - PERROR("Failed to obtain host policy"); - rc = -errno; - goto out; - } + if ( !msrs ) + return 0; for ( ; msr->index != XC_MSR_INPUT_UNUSED; ++msr ) { - xen_msr_entry_t *cur_msr = find_msr(cur, nr_cur, msr->index); - const xen_msr_entry_t *def_msr = find_msr(def, nr_def, msr->index); - const xen_msr_entry_t *host_msr = find_msr(host, nr_host, msr->index); - unsigned int i; + xen_msr_entry_t *cur_msr = find_msr(cur, msr->index); + const xen_msr_entry_t *def_msr = find_msr(def, msr->index); + const xen_msr_entry_t *host_msr = find_msr(host, msr->index); if ( cur_msr == NULL || def_msr == NULL || host_msr == NULL ) { ERROR("Missing MSR %#x", msr->index); - rc = -ENOENT; - goto out; + return -ENOENT; } - for ( i = 0; i < ARRAY_SIZE(msr->policy) - 1; i++ ) + for ( size_t i = 0; i < ARRAY_SIZE(msr->policy) - 1; i++ ) { bool val; @@ -542,8 +414,7 @@ static int xc_msr_policy(xc_interface *xch, domid_t domid, { ERROR("MSR index %#x: bad character '%c' in policy string '%s'", msr->index, msr->policy[i], msr->policy); - rc = -EINVAL; - goto out; + return -EINVAL; } if ( val ) @@ -553,25 +424,7 @@ static int xc_msr_policy(xc_interface *xch, domid_t domid, } } - /* Feed the transformed policy back up to Xen. */ - rc = xc_set_domain_cpu_policy(xch, domid, 0, NULL, nr_cur, cur, - &err_leaf, &err_subleaf, &err_msr); - if ( rc ) - { - PERROR("Failed to set d%d's policy (err leaf %#x, subleaf %#x, msr %#x)", - domid, err_leaf, err_subleaf, err_msr); - rc = -errno; - goto out; - } - - /* Success! */ - - out: - free(cur); - free(def); - free(host); - - return rc; + return 0; } int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, @@ -583,14 +436,16 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, int rc; bool hvm; xc_domaininfo_t di; - struct xc_cpu_policy *p = xc_cpu_policy_init(); - unsigned int i, nr_leaves = ARRAY_SIZE(p->leaves), nr_msrs = 0; - uint32_t err_leaf = -1, err_subleaf = -1, err_msr = -1; - uint32_t host_featureset[FEATURESET_NR_ENTRIES] = {}; - uint32_t len = ARRAY_SIZE(host_featureset); - if ( !p ) - return -ENOMEM; + struct xc_cpu_policy *host = xc_cpu_policy_init(); + struct xc_cpu_policy *def = xc_cpu_policy_init(); + struct xc_cpu_policy *cur = xc_cpu_policy_init(); + + if ( !host || !def || !cur ) + { + rc = -ENOMEM; + goto out; + } if ( (rc = xc_domain_getinfo_single(xch, domid, &di)) < 0 ) { @@ -600,21 +455,19 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, } hvm = di.flags & XEN_DOMINF_hvm_guest; - /* Get the host policy. */ - rc = xc_get_cpu_featureset(xch, XEN_SYSCTL_cpu_featureset_host, - &len, host_featureset); - /* Tolerate "buffer too small", as we've got the bits we need. */ - if ( rc && errno != ENOBUFS ) + /* Get the raw host policy */ + rc = xc_cpu_policy_get_system(xch, XEN_SYSCTL_cpu_policy_host, host); + if ( rc ) { - PERROR("Failed to obtain host featureset"); + PERROR("Failed to obtain host policy"); rc = -errno; goto out; } /* Get the domain's default policy. */ - rc = get_system_cpu_policy(xch, hvm ? XEN_SYSCTL_cpu_policy_hvm_default - : XEN_SYSCTL_cpu_policy_pv_default, - &nr_leaves, p->leaves, &nr_msrs, NULL); + rc = xc_cpu_policy_get_system(xch, hvm ? XEN_SYSCTL_cpu_policy_hvm_default + : XEN_SYSCTL_cpu_policy_pv_default, + def); if ( rc ) { PERROR("Failed to obtain %s default policy", hvm ? "hvm" : "pv"); @@ -622,14 +475,8 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, goto out; } - rc = x86_cpuid_copy_from_buffer(&p->policy, p->leaves, nr_leaves, - &err_leaf, &err_subleaf); - if ( rc ) - { - ERROR("Failed to deserialise CPUID (err leaf %#x, subleaf %#x) (%d = %s)", - err_leaf, err_subleaf, -rc, strerror(-rc)); - goto out; - } + /* Copy the deserialised default policy to modify it */ + memcpy(cur, def, sizeof(*cur)); if ( restore ) { @@ -647,18 +494,18 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, * - Re-enable features which have become (possibly) off by default. */ - p->policy.basic.rdrand = test_bit(X86_FEATURE_RDRAND, host_featureset); - p->policy.feat.hle = test_bit(X86_FEATURE_HLE, host_featureset); - p->policy.feat.rtm = test_bit(X86_FEATURE_RTM, host_featureset); + cur->policy.basic.rdrand = host->policy.basic.rdrand; + cur->policy.feat.hle = host->policy.feat.hle; + cur->policy.feat.rtm = host->policy.feat.rtm; if ( hvm ) { - p->policy.feat.mpx = test_bit(X86_FEATURE_MPX, host_featureset); + cur->policy.feat.mpx = host->policy.feat.mpx; } - p->policy.basic.max_leaf = min(p->policy.basic.max_leaf, 0xdu); - p->policy.feat.max_subleaf = 0; - p->policy.extd.max_leaf = min(p->policy.extd.max_leaf, 0x8000001c); + cur->policy.basic.max_leaf = min(cur->policy.basic.max_leaf, 0xdu); + cur->policy.feat.max_subleaf = 0; + cur->policy.extd.max_leaf = min(cur->policy.extd.max_leaf, 0x8000001c); } if ( featureset ) @@ -666,7 +513,7 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, uint32_t disabled_features[FEATURESET_NR_ENTRIES], feat[FEATURESET_NR_ENTRIES] = {}; static const uint32_t deep_features[] = INIT_DEEP_FEATURES; - unsigned int i, b; + unsigned int b; /* * The user supplied featureset may be shorter or longer than @@ -677,14 +524,14 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, /* Check for truncated set bits. */ rc = -EOPNOTSUPP; - for ( i = user_len; i < nr_features; ++i ) + for ( size_t i = user_len; i < nr_features; ++i ) if ( featureset[i] != 0 ) goto out; memcpy(feat, featureset, sizeof(*featureset) * user_len); /* Disable deep dependencies of disabled features. */ - for ( i = 0; i < ARRAY_SIZE(disabled_features); ++i ) + for ( size_t i = 0; i < ARRAY_SIZE(disabled_features); ++i ) disabled_features[i] = ~feat[i] & deep_features[i]; for ( b = 0; b < sizeof(disabled_features) * CHAR_BIT; ++b ) @@ -695,24 +542,24 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, !(dfs = x86_cpu_policy_lookup_deep_deps(b)) ) continue; - for ( i = 0; i < ARRAY_SIZE(disabled_features); ++i ) + for ( size_t i = 0; i < ARRAY_SIZE(disabled_features); ++i ) { feat[i] &= ~dfs[i]; disabled_features[i] &= ~dfs[i]; } } - x86_cpu_featureset_to_policy(feat, &p->policy); + x86_cpu_featureset_to_policy(feat, &cur->policy); } else { - p->policy.extd.itsc = itsc; + cur->policy.extd.itsc = itsc; if ( hvm ) { - p->policy.basic.pae = pae; - p->policy.basic.vmx = nested_virt; - p->policy.extd.svm = nested_virt; + cur->policy.basic.pae = pae; + cur->policy.basic.vmx = nested_virt; + cur->policy.extd.svm = nested_virt; } } @@ -722,8 +569,8 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, * On hardware without CPUID Faulting, PV guests see real topology. * As a consequence, they also need to see the host htt/cmp fields. */ - p->policy.basic.htt = test_bit(X86_FEATURE_HTT, host_featureset); - p->policy.extd.cmp_legacy = test_bit(X86_FEATURE_CMP_LEGACY, host_featureset); + cur->policy.basic.htt = host->policy.basic.htt; + cur->policy.extd.cmp_legacy = host->policy.extd.cmp_legacy; } else { @@ -731,28 +578,28 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, * Topology for HVM guests is entirely controlled by Xen. For now, we * hardcode APIC_ID = vcpu_id * 2 to give the illusion of no SMT. */ - p->policy.basic.htt = true; - p->policy.extd.cmp_legacy = false; + cur->policy.basic.htt = true; + cur->policy.extd.cmp_legacy = false; /* * Leaf 1 EBX[23:16] is Maximum Logical Processors Per Package. * Update to reflect vLAPIC_ID = vCPU_ID * 2, but make sure to avoid * overflow. */ - if ( !p->policy.basic.lppp ) - p->policy.basic.lppp = 2; - else if ( !(p->policy.basic.lppp & 0x80) ) - p->policy.basic.lppp *= 2; + if ( !cur->policy.basic.lppp ) + cur->policy.basic.lppp = 2; + else if ( !(cur->policy.basic.lppp & 0x80) ) + cur->policy.basic.lppp *= 2; - switch ( p->policy.x86_vendor ) + switch ( cur->policy.x86_vendor ) { case X86_VENDOR_INTEL: - for ( i = 0; (p->policy.cache.subleaf[i].type && - i < ARRAY_SIZE(p->policy.cache.raw)); ++i ) + for ( size_t i = 0; (cur->policy.cache.subleaf[i].type && + i < ARRAY_SIZE(cur->policy.cache.raw)); ++i ) { - p->policy.cache.subleaf[i].cores_per_package = - (p->policy.cache.subleaf[i].cores_per_package << 1) | 1; - p->policy.cache.subleaf[i].threads_per_cache = 0; + cur->policy.cache.subleaf[i].cores_per_package = + (cur->policy.cache.subleaf[i].cores_per_package << 1) | 1; + cur->policy.cache.subleaf[i].threads_per_cache = 0; } break; @@ -772,49 +619,45 @@ int xc_cpuid_apply_policy(xc_interface *xch, uint32_t domid, bool restore, * apic_id_size values greater than 7. Limit the value to * 7 for now. */ - if ( p->policy.extd.nc < 0x7f ) + if ( cur->policy.extd.nc < 0x7f ) { - if ( p->policy.extd.apic_id_size != 0 && p->policy.extd.apic_id_size < 0x7 ) - p->policy.extd.apic_id_size++; + if ( cur->policy.extd.apic_id_size != 0 && cur->policy.extd.apic_id_size < 0x7 ) + cur->policy.extd.apic_id_size++; - p->policy.extd.nc = (p->policy.extd.nc << 1) | 1; + cur->policy.extd.nc = (cur->policy.extd.nc << 1) | 1; } break; } } - nr_leaves = ARRAY_SIZE(p->leaves); - rc = x86_cpuid_copy_to_buffer(&p->policy, p->leaves, &nr_leaves); - if ( rc ) + if ( xend || msr ) { - ERROR("Failed to serialise CPUID (%d = %s)", -rc, strerror(-rc)); - goto out; + /* The overrides are over the serialised form of the policy */ + if ( (rc = xc_cpu_policy_serialise(xch, cur)) ) + goto out; + + if ( (rc = xc_cpuid_xend_policy(xch, domid, xend, host, def, cur)) ) + goto out; + if ( (rc = xc_msr_policy(xch, domid, msr, host, def, cur)) ) + goto out; + + if ( (rc = deserialize_policy(xch, cur)) ) + goto out; } - rc = xc_set_domain_cpu_policy(xch, domid, nr_leaves, p->leaves, 0, NULL, - &err_leaf, &err_subleaf, &err_msr); + rc = xc_cpu_policy_set_domain(xch, domid, cur); if ( rc ) { - PERROR("Failed to set d%d's policy (err leaf %#x, subleaf %#x, msr %#x)", - domid, err_leaf, err_subleaf, err_msr); rc = -errno; goto out; } - if ( xend && (rc = xc_cpuid_xend_policy(xch, domid, xend)) ) - goto out; - - if ( msr ) - { - rc = xc_msr_policy(xch, domid, msr); - if ( rc ) - goto out; - } - rc = 0; out: - xc_cpu_policy_destroy(p); + xc_cpu_policy_destroy(def); + xc_cpu_policy_destroy(host); + xc_cpu_policy_destroy(cur); return rc; } @@ -834,34 +677,6 @@ void xc_cpu_policy_destroy(xc_cpu_policy_t *policy) } } -static int deserialize_policy(xc_interface *xch, xc_cpu_policy_t *policy) -{ - uint32_t err_leaf = -1, err_subleaf = -1, err_msr = -1; - int rc; - - rc = x86_cpuid_copy_from_buffer(&policy->policy, policy->leaves, - policy->nr_leaves, &err_leaf, &err_subleaf); - if ( rc ) - { - if ( err_leaf != -1 ) - ERROR("Failed to deserialise CPUID (err leaf %#x, subleaf %#x) (%d = %s)", - err_leaf, err_subleaf, -rc, strerror(-rc)); - return rc; - } - - rc = x86_msr_copy_from_buffer(&policy->policy, policy->msrs, - policy->nr_msrs, &err_msr); - if ( rc ) - { - if ( err_msr != -1 ) - ERROR("Failed to deserialise MSR (err MSR %#x) (%d = %s)", - err_msr, -rc, strerror(-rc)); - return rc; - } - - return 0; -} - int xc_cpu_policy_get_system(xc_interface *xch, unsigned int policy_idx, xc_cpu_policy_t *policy) {