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[Qemu-devel] Re: [PATCH v3 12/21] kvm: x86: Drop MCE MSRs write back res
From: |
Huang Ying |
Subject: |
[Qemu-devel] Re: [PATCH v3 12/21] kvm: x86: Drop MCE MSRs write back restrictions |
Date: |
Wed, 05 Jan 2011 14:42:31 +0800 |
On Tue, 2011-01-04 at 16:32 +0800, Jan Kiszka wrote:
> From: Jan Kiszka <address@hidden>
>
> There is no need to restrict writing back MCE MSRs to reset or full
> state updates as setting their values has no side effects.
Sorry for late.
The MCE MSRs contents is sticky for warm reset except MCG_STATUS, so
their content should be kept. And the following sequence may set
uncorrected value in MCE registers.
savevm -> loadvm -> (OS clear MCE registers) -> reset -> (MCE registers
has new (uncorrected) value)
Best Regards,
Huang Ying
> Signed-off-by: Jan Kiszka <address@hidden>
> CC: Huang Ying <address@hidden>
> ---
> target-i386/kvm.c | 12 ++++--------
> 1 files changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/target-i386/kvm.c b/target-i386/kvm.c
> index 8267655..1789bff 100644
> --- a/target-i386/kvm.c
> +++ b/target-i386/kvm.c
> @@ -863,14 +863,10 @@ static int kvm_put_msrs(CPUState *env, int level)
> if (env->mcg_cap) {
> int i;
>
> - if (level == KVM_PUT_RESET_STATE) {
> - kvm_msr_entry_set(&msrs[n++], MSR_MCG_STATUS, env->mcg_status);
> - } else if (level == KVM_PUT_FULL_STATE) {
> - kvm_msr_entry_set(&msrs[n++], MSR_MCG_STATUS, env->mcg_status);
> - kvm_msr_entry_set(&msrs[n++], MSR_MCG_CTL, env->mcg_ctl);
> - for (i = 0; i < (env->mcg_cap & 0xff) * 4; i++) {
> - kvm_msr_entry_set(&msrs[n++], MSR_MC0_CTL + i,
> env->mce_banks[i]);
> - }
> + kvm_msr_entry_set(&msrs[n++], MSR_MCG_STATUS, env->mcg_status);
> + kvm_msr_entry_set(&msrs[n++], MSR_MCG_CTL, env->mcg_ctl);
> + for (i = 0; i < (env->mcg_cap & 0xff) * 4; i++) {
> + kvm_msr_entry_set(&msrs[n++], MSR_MC0_CTL + i,
> env->mce_banks[i]);
> }
> }
> #endif
- [Qemu-devel] [PATCH v3 07/21] kvm: x86: Prepare kvm_get_mp_state for in-kernel irqchip, (continued)
- [Qemu-devel] [PATCH v3 07/21] kvm: x86: Prepare kvm_get_mp_state for in-kernel irqchip, Jan Kiszka, 2011/01/04
- [Qemu-devel] [PATCH v3 05/21] x86: Optionally dump code bytes on cpu_dump_state, Jan Kiszka, 2011/01/04
- [Qemu-devel] [PATCH v3 01/21] kvm: Fix coding style violations, Jan Kiszka, 2011/01/04
- [Qemu-devel] [PATCH v3 08/21] kvm: x86: Remove redundant mp_state initialization, Jan Kiszka, 2011/01/04
- [Qemu-devel] [PATCH v3 04/21] kvm: Improve reporting of fatal errors, Jan Kiszka, 2011/01/04
- [Qemu-devel] [PATCH v3 09/21] kvm: x86: Fix xcr0 reset mismerge, Jan Kiszka, 2011/01/04
- [Qemu-devel] [PATCH v3 10/21] kvm: x86: Refactor msr_star/hsave_pa setup and checks, Jan Kiszka, 2011/01/04
- [Qemu-devel] [PATCH v3 11/21] kvm: x86: Reset paravirtual MSRs, Jan Kiszka, 2011/01/04
- [Qemu-devel] [PATCH v3 12/21] kvm: x86: Drop MCE MSRs write back restrictions, Jan Kiszka, 2011/01/04
- [Qemu-devel] Re: [PATCH v3 12/21] kvm: x86: Drop MCE MSRs write back restrictions,
Huang Ying <=
[Qemu-devel] [PATCH v3 14/21] kvm: x86: Fix !CONFIG_KVM_PARA build, Jan Kiszka, 2011/01/04
[Qemu-devel] [PATCH v3 16/21] kvm: Drop smp_cpus argument from init functions, Jan Kiszka, 2011/01/04
[Qemu-devel] [PATCH v3 19/21] kvm: Flush coalesced mmio buffer on IO window exits, Jan Kiszka, 2011/01/04
[Qemu-devel] [PATCH v3 18/21] kvm: x86: Rework identity map and TSS setup for larger BIOS sizes, Jan Kiszka, 2011/01/04
[Qemu-devel] [PATCH v3 20/21] kvm: Do not use qemu_fair_mutex, Jan Kiszka, 2011/01/04
[Qemu-devel] [PATCH v3 15/21] kvm: x86: Introduce kvmclock device to save/restore its state, Jan Kiszka, 2011/01/04