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Re: [Qemu-devel] target-i386: block migration and savevm if invariant ts
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] target-i386: block migration and savevm if invariant tsc is exposed (v3) |
Date: |
Thu, 24 Apr 2014 16:21:59 -0300 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Apr 23, 2014 at 06:04:45PM -0300, Marcelo Tosatti wrote:
>
> Invariant TSC documentation mentions that "invariant TSC will run at a
> constant rate in all ACPI P-, C-. and T-states".
>
> This is not the case if migration to a host with different TSC frequency
> is allowed, or if savevm is performed. So block migration/savevm.
>
> Signed-off-by: Marcelo Tosatti <address@hidden>
>
[...]
> @@ -702,6 +706,16 @@ int kvm_arch_init_vcpu(CPUState *cs)
> !!(c->ecx & CPUID_EXT_SMX);
> }
>
> + c = cpuid_find_entry(&cpuid_data.cpuid, 0x80000007, 0);
> + if (c && (c->edx & 1<<8) && invtsc_mig_blocker == NULL) {
> + /* for migration */
> + error_set(&invtsc_mig_blocker,
> + QERR_DEVICE_FEATURE_BLOCKS_MIGRATION, "invtsc", "cpu");
> + migrate_add_blocker(invtsc_mig_blocker);
> + /* for savevm */
> + vmstate_x86_cpu.unmigratable = 1;
Did you ensure this will always happen before vmstate_register() is
called for vmstate_x86_cpu? I believe kvm_arch_init_vcpu() is called a
long long time after device_set_realized() (which is where
vmstate_register() is called for DeviceState objects).
--
Eduardo
- Re: [Qemu-devel] [patch 2/2] target-i386: block migration and savevm if invariant tsc is exposed, (continued)
- [Qemu-devel] [patch 1/2] target-i386: support "invariant tsc" flag, Marcelo Tosatti, 2014/04/22
- [Qemu-devel] [patch 0/2] expose invariant tsc flag for kvm guests (v2), Marcelo Tosatti, 2014/04/23
- [Qemu-devel] [patch 1/2] target-i386: support "invariant tsc" flag, Marcelo Tosatti, 2014/04/23
- [Qemu-devel] [patch 2/2] target-i386: block migration and savevm if invariant tsc is exposed, Marcelo Tosatti, 2014/04/23
- Re: [Qemu-devel] [patch 2/2] target-i386: block migration and savevm if invariant tsc is exposed, Eduardo Habkost, 2014/04/23
- [Qemu-devel] target-i386: block migration and savevm if invariant tsc is exposed (v3), Marcelo Tosatti, 2014/04/23
- Re: [Qemu-devel] target-i386: block migration and savevm if invariant tsc is exposed (v3),
Eduardo Habkost <=
- Re: [Qemu-devel] target-i386: block migration and savevm if invariant tsc is exposed (v3), Marcelo Tosatti, 2014/04/25
- Re: [Qemu-devel] target-i386: block migration and savevm if invariant tsc is exposed (v3), Eduardo Habkost, 2014/04/25
- Re: [Qemu-devel] target-i386: block migration and savevm if invariant tsc is exposed (v3), Marcelo Tosatti, 2014/04/25
- [Qemu-devel] [PATCH] savevm: check vmsd for migratability status, Marcelo Tosatti, 2014/04/25
- Re: [Qemu-devel] [PATCH] savevm: check vmsd for migratability status, Eduardo Habkost, 2014/04/28
- [Qemu-devel] [PATCH] savevm: check vmsd for migratability status (v2), Marcelo Tosatti, 2014/04/29
- Re: [Qemu-devel] [PATCH] savevm: check vmsd for migratability status (v2), Eduardo Habkost, 2014/04/30