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From 0004d2f3b0c3b21336415a967d70b7e9c2d08f54 Mon Sep 17 00:00:00 2001
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Message-Id: <0004d2f3b0c3b21336415a967d70b7e9c2d08f54@dist-git>
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From: Jiri Denemark <jdenemar@redhat.com>
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Date: Fri, 21 Jun 2019 09:26:09 +0200
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Subject: [PATCH] cpu_x86: Read CPU features from IA32_ARCH_CAPABILITIES MSR
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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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This is used by the host capabilities code to construct host CPU
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definition.
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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 56b254dccc96b7339494812c9df07ccf6af3da95)
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https://bugzilla.redhat.com/show_bug.cgi?id=1697627
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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Message-Id: <58ad207c48e0f2a6c44ff097b0881b649826ecd4.1561068591.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 | 22 ++++++++++++++++++++++
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1 file changed, 22 insertions(+)
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diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c
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index ec0e408f98..0a520f07ff 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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@@ -2771,6 +2771,28 @@ virCPUx86GetHost(virCPUDefPtr cpu,
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cpuidSet(CPUX86_EXTENDED, cpuData) < 0)
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goto cleanup;
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+ /* Read the IA32_ARCH_CAPABILITIES MSR (0x10a) if supported.
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+ * This is best effort since there might be no way to read the MSR
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+ * when we are not running as root. */
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+ if (virCPUx86DataCheckFeature(cpuData, "arch-capabilities") == 1) {
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+ uint64_t msr;
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+ unsigned long index = 0x10a;
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+
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+ if (virHostCPUGetMSR(index, &msr) == 0) {
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+ virCPUx86DataItem item = {
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+ .type = VIR_CPU_X86_DATA_MSR,
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+ .data.msr = {
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+ .index = index,
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+ .eax = msr & 0xffffffff,
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+ .edx = msr >> 32,
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+ },
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+ };
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+
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+ if (virCPUx86DataAdd(cpuData, &item) < 0)
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+ return -1;
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+ }
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+ }
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+
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ret = x86DecodeCPUData(cpu, cpuData, models);
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cpu->microcodeVersion = virHostCPUGetMicrocodeVersion();
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--
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2.22.0
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