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Message-ID: <20160208163526.GI28980@pd.tnic>
Date: Mon, 8 Feb 2016 17:35:26 +0100
From: Borislav Petkov <bp@...en8.de>
To: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Andrew Cooper <andrew.cooper3@...rix.com>, X86 ML <x86@...nel.org>,
david.e.box@...el.com, Andrey Ryabinin <ryabinin.a.a@...il.com>,
Lv Zheng <lv.zheng@...el.com>, Jan Beulich <JBeulich@...e.com>,
"H. Peter Anvin" <hpa@...or.com>, qiuxishi@...wei.com,
cocci@...teme.lip6.fr, Xen Devel <xen-devel@...ts.xensource.com>,
Joerg Roedel <joro@...tes.org>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Robert Moore <robert.moore@...el.com>,
Ingo Molnar <mingo@...hat.com>,
Andrey Ryabinin <aryabinin@...tuozzo.com>,
Mauro Carvalho Chehab <mchehab@....samsung.com>,
"Luis R. Rodriguez" <mcgrof@...e.com>,
Rusty Russell <rusty@...tcorp.com.au>,
Thomas Gleixner <tglx@...utronix.de>, mcb30@...e.org,
Juergen Gross <jgross@...e.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Andy Lutomirski <luto@...capital.net>,
"Luis R. Rodriguez" <mcgrof@...nel.org>, long.wanglong@...wei.com,
Fengguang Wu <fengguang.wu@...el.com>
Subject: Re: [Xen-devel] [PATCH v2 3/3] paravirt: rename paravirt_enabled to
paravirt_legacy
On Mon, Feb 08, 2016 at 11:31:04AM -0500, Boris Ostrovsky wrote:
> I think we are OK for PV because this code will be executed after pvops are
> set and so we will be calling xen_cpuid().
Not for the early loader - it is too early for pvops then. So you're
saying something like that won't work?
---
diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
index 055ea9941dd5..f3e563e8b5c3 100644
--- a/arch/x86/include/asm/hypervisor.h
+++ b/arch/x86/include/asm/hypervisor.h
@@ -56,9 +56,11 @@ extern const struct hypervisor_x86 x86_hyper_kvm;
extern void init_hypervisor(struct cpuinfo_x86 *c);
extern void init_hypervisor_platform(void);
extern bool hypervisor_x2apic_available(void);
+bool is_xen_hypervisor(void);
#else
static inline void init_hypervisor(struct cpuinfo_x86 *c) { }
static inline void init_hypervisor_platform(void) { }
static inline bool hypervisor_x2apic_available(void) { return false; }
+static inline bool is_xen_hypervisor(void) { return false; }
#endif /* CONFIG_HYPERVISOR_GUEST */
#endif /* _ASM_X86_HYPERVISOR_H */
diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c
index d820d8eae96b..bda29017f946 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -85,3 +85,24 @@ bool __init hypervisor_x2apic_available(void)
x86_hyper->x2apic_available &&
x86_hyper->x2apic_available();
}
+
+bool is_xen_hypervisor(void)
+{
+ u32 eax, ebx, ecx, edx;
+
+ eax = 0x4000000;
+ ecx = 0;
+ native_cpuid(&eax, &ebx, &ecx, &edx);
+
+ if (ebx == 0x566e6558 && ecx == 0x65584d4d && edx == 0x4d4d566e)
+ return true;
+
+ eax = 0x40000100;
+ ecx = 0;
+ native_cpuid(&eax, &ebx, &ecx, &edx);
+
+ if (ebx == 0x566e6558 && ecx == 0x65584d4d && edx == 0x4d4d566e)
+ return true;
+
+ return false;
+}
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index cea8552e2b3a..0a941ff8095c 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -35,6 +35,7 @@
#include <asm/microcode_intel.h>
#include <asm/cpu_device_id.h>
#include <asm/microcode_amd.h>
+#include <asm/hypervisor.h>
#include <asm/perf_event.h>
#include <asm/microcode.h>
#include <asm/processor.h>
@@ -86,7 +87,7 @@ static bool __init check_loader_disabled_bsp(void)
bool *res = &dis_ucode_ldr;
#endif
- if (cmdline_find_option_bool(cmdline, option))
+ if (cmdline_find_option_bool(cmdline, option) || is_xen_hypervisor())
*res = true;
return *res;
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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