From: Sean Christopherson <seanjc@google.com>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Reiji Watanabe <reijiw@google.com>
Subject: Re: [PATCH v2 06/10] KVM: x86: Fold fx_init() into kvm_arch_vcpu_create()
Date: Wed, 6 Oct 2021 23:04:04 +0000 [thread overview]
Message-ID: <YV4rZHGII2PaXIGY@google.com> (raw)
In-Reply-To: <87tuie7zhb.fsf@vitty.brq.redhat.com>
On Tue, Sep 21, 2021, Vitaly Kuznetsov wrote:
> Sean Christopherson <seanjc@google.com> writes:
>
> > Move the few bits of relevant fx_init() code into kvm_arch_vcpu_create(),
> > dropping the superfluous check on vcpu->arch.guest_fpu that was blindly
> > and wrongly added by commit ed02b213098a ("KVM: SVM: Guest FPU state
> > save/restore not needed for SEV-ES guest").
>
> I have more questions to the above mentioned commit: why is it OK to
> 'return 0' from kvm_vcpu_ioctl_x86_set_xsave() without writing anything
> to 'guest_xsave'? Same goes to kvm_arch_vcpu_ioctl_get_fpu(). Whould't
> it be better to throw an error as we can't actually get this information
> for encrypted guests? It's probably too late to change this now I
> suppose ...
Yep, I would also have preferred that KVM force userspace to avoid ioctls() that
cannot work, but that ship has sailed.
next prev parent reply other threads:[~2021-10-06 23:04 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-21 0:02 [PATCH v2 00/10] KVM: x86: Clean up RESET "emulation" Sean Christopherson
2021-09-21 0:02 ` [PATCH v2 01/10] KVM: x86: Mark all registers as avail/dirty at vCPU creation Sean Christopherson
2021-09-21 13:40 ` Vitaly Kuznetsov
2021-09-21 0:02 ` [PATCH v2 02/10] KVM: x86: Clear KVM's cached guest CR3 at RESET/INIT Sean Christopherson
2021-09-21 13:52 ` Vitaly Kuznetsov
2021-09-21 13:55 ` Vitaly Kuznetsov
2021-09-21 17:35 ` Paolo Bonzini
2021-09-21 0:02 ` [PATCH v2 03/10] KVM: x86: Do not mark all registers as avail/dirty during RESET/INIT Sean Christopherson
2021-09-21 0:02 ` [PATCH v2 04/10] KVM: x86: Remove defunct setting of CR0.ET for guests during vCPU create Sean Christopherson
2021-09-21 14:23 ` Vitaly Kuznetsov
2021-09-21 0:02 ` [PATCH v2 05/10] KVM: x86: Remove defunct setting of XCR0 for guest " Sean Christopherson
2021-09-21 14:37 ` Vitaly Kuznetsov
2021-09-21 0:02 ` [PATCH v2 06/10] KVM: x86: Fold fx_init() into kvm_arch_vcpu_create() Sean Christopherson
2021-09-21 14:52 ` Vitaly Kuznetsov
2021-10-06 23:04 ` Sean Christopherson [this message]
2021-09-21 0:03 ` [PATCH v2 07/10] KVM: VMX: Drop explicit zeroing of MSR guest values at vCPU creation Sean Christopherson
2021-09-21 15:02 ` Vitaly Kuznetsov
2021-09-21 0:03 ` [PATCH v2 08/10] KVM: VMX: Move RESET emulation to vmx_vcpu_reset() Sean Christopherson
2021-09-21 0:03 ` [PATCH v2 09/10] KVM: SVM: Move RESET emulation to svm_vcpu_reset() Sean Christopherson
2021-09-21 0:03 ` [PATCH v2 10/10] KVM: x86: WARN on non-zero CRs at RESET to detect improper initalization Sean Christopherson
2021-09-21 13:59 ` Vitaly Kuznetsov
2021-09-23 16:23 ` [PATCH v2 00/10] KVM: x86: Clean up RESET "emulation" Paolo Bonzini
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