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From: Bandan Das <bsd@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
	rkrcmar@redhat.com, guangrong.xiao@linux.intel.com,
	Yang Zhang <yang.z.zhang@intel.com>,
	wanpeng.li@linux.intel.com
Subject: Re: [PATCH 06/13] KVM: x86: pass the whole hflags field to emulator and back
Date: Wed, 06 May 2015 12:49:39 -0400	[thread overview]
Message-ID: <jpgmw1hirbw.fsf@redhat.com> (raw)
In-Reply-To: <5548ECEB.3090900@redhat.com> (Paolo Bonzini's message of "Tue, 05 May 2015 18:16:43 +0200")

Paolo Bonzini <pbonzini@redhat.com> writes:

> On 05/05/2015 17:47, Bandan Das wrote:
>> > The hflags field will contain information about system management mode
>> > and will be useful for the emulator.  Pass the entire field rather than
>> > just the guest-mode information.
>>
>> With respect to maintaining maximum isolation between vcpu internals and
>> the emulator,
>
> Isolation is maintained.  hflags are simply parts of the processor state
> that are not visible to the guest, you can choose to include them as
> separate flags or in a single one.  Bundling them in a single flag makes
> it a bit faster to pass around many of them.
>
> While we do not need all of them in the emulator, that's in some cases a
> limitation of the emulator.  For example, if we wanted to emulate
> CLGI/STGI we would need either HF_GIF_MASK or another .  Likewise,
> HF_NMI_MASK could replace emulator_set_nmi_mask (especially in v2 of the
> series, which will add kvm_set_hflags).
>
> However, if you prefer, I can change it to "bool smm_mode" + a new
> smm_exit emulator callback.

No, this makes sense. It's better to just pass hflags then to pass
bits individually.

> Paolo
>
>> why not just "bool smm_mode" ?
>> 

  reply	other threads:[~2015-05-06 16:49 UTC|newest]

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-30 11:35 [RFC PATCH 00/13] KVM: x86: SMM support Paolo Bonzini
2015-04-30 11:36 ` [PATCH 01/13] KVM: MMU: fix for CR4.SMEP=1, CR0.WP=0? Paolo Bonzini
2015-05-08  2:52   ` Xiao Guangrong
2015-04-30 11:36 ` [PATCH 02/13] KVM: reuse memslot in kvm_write_guest_page Paolo Bonzini
2015-05-05 15:03   ` Bandan Das
2015-05-05 16:29     ` Radim Krčmář
2015-04-30 11:36 ` [PATCH 03/13] KVM: export __gfn_to_pfn_memslot, drop gfn_to_pfn_async Paolo Bonzini
2015-04-30 11:36 ` [PATCH 04/13] KVM: remove unnecessary arg from mark_page_dirty_in_slot, export it Paolo Bonzini
2015-04-30 11:36 ` [PATCH 05/13] KVM: x86: pass host_initiated to functions that read MSRs Paolo Bonzini
2015-05-04 14:01   ` Radim Krčmář
2015-05-04 16:04     ` Paolo Bonzini
2015-04-30 11:36 ` [PATCH 06/13] KVM: x86: pass the whole hflags field to emulator and back Paolo Bonzini
2015-05-05 15:47   ` Bandan Das
2015-05-05 16:16     ` Paolo Bonzini
2015-05-06 16:49       ` Bandan Das [this message]
2015-04-30 11:36 ` [PATCH 07/13] KVM: x86: API changes for SMM support Paolo Bonzini
2015-05-04 15:37   ` Radim Krčmář
2015-05-04 16:02     ` Paolo Bonzini
2015-05-05 16:36   ` Bandan Das
2015-05-05 16:45     ` Paolo Bonzini
2015-04-30 11:36 ` [PATCH 08/13] KVM: x86: stubs " Paolo Bonzini
2015-05-04 17:51   ` Radim Krčmář
2015-05-05  9:37     ` Paolo Bonzini
2015-05-05 18:38     ` Bandan Das
2015-05-05 18:48       ` Radim Krčmář
2015-04-30 11:36 ` [PATCH 09/13] KVM: x86: save/load state on SMM switch Paolo Bonzini
2015-05-04 19:59   ` Radim Krčmář
2015-05-05  9:37     ` Paolo Bonzini
2015-05-05 12:48       ` Radim Krčmář
2015-05-05 13:18         ` Paolo Bonzini
2015-05-05 20:44   ` Bandan Das
2015-05-06 10:39     ` Paolo Bonzini
2015-05-06 17:55       ` Bandan Das
2015-05-06 19:38         ` Paolo Bonzini
2015-05-12 23:56           ` Bandan Das
2015-05-13  6:58             ` Paolo Bonzini
2015-04-30 11:36 ` [PATCH 10/13] KVM: x86: add vcpu-specific functions to read/write/translate GFNs Paolo Bonzini
2015-04-30 11:36 ` [PATCH 11/13] KVM: x86: add SMM to the MMU role Paolo Bonzini
2015-04-30 11:36 ` [PATCH 12/13] KVM: x86: add KVM_MEM_X86_SMRAM memory slot flag Paolo Bonzini
2015-05-05 17:17   ` Radim Krčmář
2015-05-06  9:47     ` Paolo Bonzini
2015-05-06 16:24       ` Radim Krčmář
2015-05-06 18:15         ` Bandan Das
2015-05-06 19:43         ` Paolo Bonzini
2015-05-15 20:32   ` Avi Kivity
2015-05-18  8:31     ` Paolo Bonzini
2015-04-30 11:36 ` [PATCH 13/13] KVM: x86: advertise KVM_CAP_X86_SMM Paolo Bonzini
2015-05-05 18:40 ` [RFC PATCH 00/13] KVM: x86: SMM support Radim Krčmář
2015-05-06 11:18   ` Paolo Bonzini
2015-05-06 17:14     ` Radim Krčmář
2015-05-19 14:25 ` Zhang, Yang Z
2015-05-19 14:27   ` Paolo Bonzini
2015-05-20  1:03     ` Zhang, Yang Z
2015-05-20 15:22     ` Andi Kleen

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