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Re: [PATCH v2 1/1] hmp: synchronize cpu state for lapic info
From: |
Dongli Zhang |
Subject: |
Re: [PATCH v2 1/1] hmp: synchronize cpu state for lapic info |
Date: |
Thu, 22 Jul 2021 15:15:54 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 |
May I get feedback for this bugfix?
So far the "info lapic <id>" returns stale data and could not accurate reflect
the status in KVM.
Thank you very much!
Dongli Zhang
On 7/1/21 2:40 PM, Dongli Zhang wrote:
> While the default "info lapic" always synchronizes cpu state ...
>
> mon_get_cpu()
> -> mon_get_cpu_sync(mon, true)
> -> cpu_synchronize_state(cpu)
> -> ioctl KVM_GET_LAPIC (taking KVM as example)
>
> ... the cpu state is not synchronized when the apic-id is available as
> argument.
>
> The cpu state should be synchronized when apic-id is available. Otherwise
> the "info lapic <apic-id>" always returns stale data.
>
> Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
> ---
> Changed since v1:
> - I sent out wrong patch version in v1
>
> target/i386/monitor.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/target/i386/monitor.c b/target/i386/monitor.c
> index 119211f0b0..d833ab5b8e 100644
> --- a/target/i386/monitor.c
> +++ b/target/i386/monitor.c
> @@ -28,6 +28,7 @@
> #include "monitor/hmp-target.h"
> #include "monitor/hmp.h"
> #include "qapi/qmp/qdict.h"
> +#include "sysemu/hw_accel.h"
> #include "sysemu/kvm.h"
> #include "sysemu/sev.h"
> #include "qapi/error.h"
> @@ -656,7 +657,11 @@ void hmp_info_local_apic(Monitor *mon, const QDict
> *qdict)
>
> if (qdict_haskey(qdict, "apic-id")) {
> int id = qdict_get_try_int(qdict, "apic-id", 0);
> +
> cs = cpu_by_arch_id(id);
> + if (cs) {
> + cpu_synchronize_state(cs);
> + }
> } else {
> cs = mon_get_cpu(mon);
> }
>