linux-kernel - [PATCH v3 2/3] x86/vmware: Add basic paravirt ops support

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Message-ID: <20161028075432.90579-3-amakhalov@vmware.com>
Date:   Fri, 28 Oct 2016 00:54:31 -0700
From:   Alexey Makhalov <amakhalov@...are.com>
To:     <corbet@....net>, <akataria@...are.com>, <tglx@...utronix.de>,
        <mingo@...hat.com>, <hpa@...or.com>, <x86@...nel.org>
CC:     <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        <pv-drivers@...are.com>, Alexey Makhalov <amakhalov@...are.com>
Subject: [PATCH v3 2/3] x86/vmware: Add basic paravirt ops support

Add basic paravirt support:
 1. set pv_info.name to "VMware hypervisor" to have proper boot log message
	Booting paravirtualized kernel on VMware hypervisor
    instead of "... on bare hardware"
 2. set pv_cpu_ops.io_delay() to empty function - paravirt_nop() to
    avoid vm-exits on IO delays.

Signed-off-by: Alexey Makhalov <amakhalov@...are.com>
Acked-by: Alok N Kataria <akataria@...are.com>
---
 arch/x86/kernel/cpu/vmware.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 480790f..098a524 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -61,6 +61,16 @@ static unsigned long vmware_get_tsc_khz(void)
 	return vmware_tsc_khz;
 }
 
+#ifdef CONFIG_PARAVIRT
+static void __init vmware_paravirt_ops_setup(void)
+{
+	pv_info.name = "VMware hypervisor";
+	pv_cpu_ops.io_delay = paravirt_nop;
+}
+#else
+#define vmware_paravirt_ops_setup() do {} while (0)
+#endif
+
 static void __init vmware_platform_setup(void)
 {
 	uint32_t eax, ebx, ecx, edx;
@@ -94,6 +104,8 @@ static void __init vmware_platform_setup(void)
 	} else {
 		pr_warn("Failed to get TSC freq from the hypervisor\n");
 	}
+
+	vmware_paravirt_ops_setup();
 }
 
 /*
-- 
2.10.1