From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jan Beulich <JBeulich@suse.com>
Cc: Sergey Dyasli <sergey.dyasli@citrix.com>,
Wei Liu <wei.liu2@citrix.com>,
Xen-devel <xen-devel@lists.xen.org>
Subject: Re: [PATCH v2 1/5] x86/hvm: Handle viridian MSRs via the new guest_{rd, wr}msr() infrastructure
Date: Tue, 13 Mar 2018 15:47:40 +0000 [thread overview]
Message-ID: <41c1d046-117c-c9c7-077e-42ae6ef90656@citrix.com> (raw)
In-Reply-To: <5AA7FA4A02000078001B10D9@prv-mh.provo.novell.com>
On 13/03/18 15:20, Jan Beulich wrote:
>>>> On 07.03.18 at 19:58, <andrew.cooper3@citrix.com> wrote:
>> @@ -175,11 +177,26 @@ int guest_rdmsr(const struct vcpu *v, uint32_t msr, uint64_t *val)
>> _MSR_MISC_FEATURES_CPUID_FAULTING;
>> break;
>>
>> + case MSR_HYPERVISOR_START ... MSR_HYPERVISOR_START + NR_VIRIDIAN_MSRS -
>> 1:
>> + if ( is_viridian_domain(d) )
>> + {
>> + ret = guest_rdmsr_viridian(v, msr, val);
>> + goto out;
>> + }
>> +
>> + /* Fallthrough. */
>> default:
>> return X86EMUL_UNHANDLEABLE;
>> }
>>
>> - return X86EMUL_OKAY;
>> + out:
> I've noticed this only in the context of patch 4, but why is this label
> and yet another unnecessary "goto" here? That "goto" could simply
> be "break" afaics.
Ah - that is for changes which I haven't posted yet.
When we get onto MSRs which might be in the load/save lists, or may be
stashed in the VMCB/VMCS rather than in real hardware, we need to call
back into arch specific code when an update is completed.
~Andrew
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next prev parent reply other threads:[~2018-03-13 15:47 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-07 18:58 [PATCH v2 0/5] x86: Switch some bits of MSR handing over to the new infrastructure Andrew Cooper
2018-03-07 18:58 ` [PATCH v2 1/5] x86/hvm: Handle viridian MSRs via the new guest_{rd, wr}msr() infrastructure Andrew Cooper
2018-03-13 15:00 ` Jan Beulich
2018-03-13 15:20 ` Jan Beulich
2018-03-13 15:47 ` Andrew Cooper [this message]
2018-03-13 16:25 ` Jan Beulich
2018-03-07 18:58 ` [PATCH v2 2/5] x86: Handle the Xen " Andrew Cooper
2018-03-13 15:04 ` Jan Beulich
2018-09-07 14:30 ` Andrew Cooper
2018-09-07 15:47 ` Jan Beulich
2018-09-07 16:01 ` Andrew Cooper
2018-09-10 9:44 ` Jan Beulich
2018-03-07 18:58 ` [PATCH v2 3/5] x86: Fix APIC MSR constant names Andrew Cooper
2018-03-07 20:59 ` Konrad Rzeszutek Wilk
2018-03-08 1:26 ` Tian, Kevin
2018-03-13 15:15 ` Jan Beulich
2018-09-10 14:39 ` Roger Pau Monné
2018-03-07 18:58 ` [PATCH v2 4/5] x86/hvm: Handle x2apic MSRs via the new guest_{rd, wr}msr() infrastructure Andrew Cooper
2018-03-07 20:59 ` Konrad Rzeszutek Wilk
2018-03-13 15:21 ` Jan Beulich
2018-09-10 14:45 ` Roger Pau Monné
2018-03-07 18:58 ` [PATCH v2 5/5] x86/msr: Blacklist various MSRs which guests definitely shouldn't be using Andrew Cooper
2018-03-07 21:01 ` Konrad Rzeszutek Wilk
2018-03-13 15:35 ` Jan Beulich
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