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mx.microsoft.com 1; spf=pass smtp.mailfrom=citrix.com; dmarc=pass action=none header.from=citrix.com; dkim=pass header.d=citrix.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.onmicrosoft.com; s=selector2-citrix-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=hKIl+cZikbO/4WJIAGz+bxYAoaTNWAIK2jf+mYY0UCM=; b=iJfSfWWvXa8cTWHaS2XtydeYO1kTKtb5TZZNJPvMtZYU76hxq+38pBa3YBcJ5F5oa7+Ez8IkspvJA1b+vSGa7vCqQEWqEpgeQ+rDRAt4pELOYqjjrrs7YL33jzBpv5OJrg4YtRDfqcnwE3iQ5fMAnokF5jNjaVwwIq5CLEMGbcc= From: Roger Pau Monne To: CC: Andrew Cooper , Roger Pau Monne , Ian Jackson , Wei Liu Subject: [PATCH v2 11/21] libs/guest: allow fetching a specific MSR entry from a cpu policy Date: Tue, 13 Apr 2021 16:01:29 +0200 Message-ID: <20210413140140.73690-12-roger.pau@citrix.com> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210413140140.73690-1-roger.pau@citrix.com> References: <20210413140140.73690-1-roger.pau@citrix.com> Content-Type: text/plain; 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Provide a helper to perform a binary search against an array of MSR entries. This is useful to callers can peek data from the opaque xc_cpu_policy_t type. No caller of the interface introduced on this patch. Signed-off-by: Roger Pau Monné --- Changes since v1: - Introduce a helper to perform a binary search of the MSR entries array. --- tools/include/xenctrl.h | 2 ++ tools/libs/guest/xg_cpuid_x86.c | 42 +++++++++++++++++++++++++++++++++ 2 files changed, 44 insertions(+) diff --git a/tools/include/xenctrl.h b/tools/include/xenctrl.h index cbca7209e34..605c632cf30 100644 --- a/tools/include/xenctrl.h +++ b/tools/include/xenctrl.h @@ -2611,6 +2611,8 @@ int xc_cpu_policy_serialise(xc_interface *xch, const xc_cpu_policy_t policy, int xc_cpu_policy_get_cpuid(xc_interface *xch, const xc_cpu_policy_t policy, uint32_t leaf, uint32_t subleaf, xen_cpuid_leaf_t *out); +int xc_cpu_policy_get_msr(xc_interface *xch, const xc_cpu_policy_t policy, + uint32_t msr, xen_msr_entry_t *out); int xc_get_cpu_levelling_caps(xc_interface *xch, uint32_t *caps); int xc_get_cpu_featureset(xc_interface *xch, uint32_t index, diff --git a/tools/libs/guest/xg_cpuid_x86.c b/tools/libs/guest/xg_cpuid_x86.c index d146c5bbc99..a4307d50ddb 100644 --- a/tools/libs/guest/xg_cpuid_x86.c +++ b/tools/libs/guest/xg_cpuid_x86.c @@ -845,3 +845,45 @@ int xc_cpu_policy_get_cpuid(xc_interface *xch, const xc_cpu_policy_t policy, *out = *tmp; return 0; } + +static int compare_entries(const void *l, const void *r) +{ + const xen_msr_entry_t *lhs = l; + const xen_msr_entry_t *rhs = r; + + if ( lhs->idx == rhs->idx ) + return 0; + return lhs->idx < rhs->idx ? -1 : 1; +} + +static xen_msr_entry_t *find_entry(xen_msr_entry_t *entries, + unsigned int nr_entries, unsigned int index) +{ + const xen_msr_entry_t key = { index }; + + return bsearch(&key, entries, nr_entries, sizeof(*entries), compare_entries); +} + +int xc_cpu_policy_get_msr(xc_interface *xch, const xc_cpu_policy_t policy, + uint32_t msr, xen_msr_entry_t *out) +{ + unsigned int nr_entries = ARRAY_SIZE(policy->entries); + xen_msr_entry_t *tmp; + int rc; + + rc = xc_cpu_policy_serialise(xch, policy, NULL, 0, + policy->entries, &nr_entries); + if ( rc ) + return rc; + + tmp = find_entry(policy->entries, nr_entries, msr); + if ( !tmp ) + { + /* Unable to find a matching MSR. */ + errno = ENOENT; + return -1; + } + + *out = *tmp; + return 0; +} -- 2.30.1