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xen-devel
RE: [Xen-devel] [PATCH]ACPI: re-enable mwait for xen cpuidle
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To: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
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Subject: |
RE: [Xen-devel] [PATCH]ACPI: re-enable mwait for xen cpuidle |
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From: |
"Wei, Gang" <gang.wei@xxxxxxxxx> |
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Date: |
Fri, 2 Apr 2010 21:41:20 +0800 |
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"xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Yu, Ke" <ke.yu@xxxxxxxxx> |
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[Xen-devel] [PATCH]ACPI: re-enable mwait for xen cpuidle |
The 3rd choice: don't clear MWAIT feature in xen. This should be the best
choice.
Jimmy
X86: re-enable mwait for xen cpuidle
Xen hypervisor doesn't export mwait feature to dom0, but latest Linux kernel
start to check this feature while initializing _PDC object. Pass the MWAIT
feature to dom0 to let dom0 got & pass to xen correct C state info.
Signed-off-by: Wei Gang <gang.wei@xxxxxxxxx>
diff -r 537451477469 xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c Thu Apr 01 09:55:27 2010 +0100
+++ b/xen/arch/x86/traps.c Sat Apr 03 05:26:53 2010 +0800
@@ -776,7 +776,6 @@ static void pv_cpuid(struct cpu_user_reg
__clear_bit(X86_FEATURE_PBE, &d);
__clear_bit(X86_FEATURE_DTES64 % 32, &c);
- __clear_bit(X86_FEATURE_MWAIT % 32, &c);
__clear_bit(X86_FEATURE_DSCPL % 32, &c);
__clear_bit(X86_FEATURE_VMXE % 32, &c);
__clear_bit(X86_FEATURE_SMXE % 32, &c);
@@ -814,7 +813,6 @@ static void pv_cpuid(struct cpu_user_reg
__clear_bit(X86_FEATURE_SKINIT % 32, &c);
__clear_bit(X86_FEATURE_WDT % 32, &c);
break;
- case 5: /* MONITOR/MWAIT */
case 0xa: /* Architectural Performance Monitor Features */
case 0x8000000a: /* SVM revision and features */
case 0x8000001b: /* Instruction Based Sampling */
re-enable-mwait-for-dom0.patch
Description: re-enable-mwait-for-dom0.patch
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- [Xen-devel] [PATCH]ACPI: re-enable mwait for xen cpuidle, Wei, Gang
- RE: [Xen-devel] [PATCH]ACPI: re-enable mwait for xen cpuidle, Wei, Gang
- Re: [Xen-devel] [PATCH]ACPI: re-enable mwait for xen cpuidle, Jeremy Fitzhardinge
- RE: [Xen-devel] [PATCH]ACPI: re-enable mwait for xen cpuidle, Wei, Gang
- Re: [Xen-devel] [PATCH]ACPI: re-enable mwait for xen cpuidle, Jeremy Fitzhardinge
- RE: [Xen-devel] [PATCH]ACPI: re-enable mwait for xen cpuidle, Wei, Gang
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