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From 48e546c1097a61c806412efe53e216fbc8beafca Mon Sep 17 00:00:00 2001
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Message-Id: <48e546c1097a61c806412efe53e216fbc8beafca@dist-git>
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From: Jiri Denemark <jdenemar@redhat.com>
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Date: Tue, 26 May 2020 10:59:31 +0200
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Subject: [PATCH] cpu_x86: Introduce virCPUx86SignatureFromCPUID
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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It can be used for separating family, model, and stepping numbers from a
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single 32b integer as reported by CPUID.
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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(cherry picked from commit 3b474c1f8f3c1f124fab303625733ea79047660c)
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https://bugzilla.redhat.com/show_bug.cgi?id=1840010
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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Message-Id: <1fe352bfb7cf40b5b8e24eea3bf4e476269adb92.1590483392.git.jdenemar@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/cpu/cpu_x86.c | 19 ++++++++++++++-----
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1 file changed, 14 insertions(+), 5 deletions(-)
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diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
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index ed2090b0c6..dad3bceff0 100644
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--- a/src/cpu/cpu_x86.c
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+++ b/src/cpu/cpu_x86.c
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@@ -717,6 +717,18 @@ x86MakeSignature(unsigned int family,
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}
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+static void
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+virCPUx86SignatureFromCPUID(uint32_t sig,
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+ unsigned int *family,
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+ unsigned int *model,
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+ unsigned int *stepping)
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+{
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+ *family = ((sig >> 20) & 0xff) + ((sig >> 8) & 0xf);
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+ *model = ((sig >> 12) & 0xf0) + ((sig >> 4) & 0xf);
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+ *stepping = sig & 0xf;
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+}
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+
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+
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static void
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x86DataToSignatureFull(const virCPUx86Data *data,
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unsigned int *family,
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@@ -725,17 +737,14 @@ x86DataToSignatureFull(const virCPUx86Data *data,
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{
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virCPUx86DataItem leaf1 = CPUID(.eax_in = 0x1);
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virCPUx86DataItemPtr item;
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- virCPUx86CPUIDPtr cpuid;
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*family = *model = *stepping = 0;
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if (!(item = virCPUx86DataGet(data, &leaf1)))
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return;
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- cpuid = &item->data.cpuid;
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- *family = ((cpuid->eax >> 20) & 0xff) + ((cpuid->eax >> 8) & 0xf);
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- *model = ((cpuid->eax >> 12) & 0xf0) + ((cpuid->eax >> 4) & 0xf);
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- *stepping = cpuid->eax & 0xf;
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+ virCPUx86SignatureFromCPUID(item->data.cpuid.eax,
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+ family, model, stepping);
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}
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--
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2.26.2
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