[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [PATCH v7 7/9] i386: HV_HYPERCALL_AVAILABLE privilege bit is always
|
From: |
Eduardo Habkost |
|
Subject: |
Re: [PATCH v7 7/9] i386: HV_HYPERCALL_AVAILABLE privilege bit is always needed |
|
Date: |
Thu, 3 Jun 2021 18:43:39 -0400 |
On Thu, Jun 03, 2021 at 01:48:33PM +0200, Vitaly Kuznetsov wrote:
> According to TLFS, Hyper-V guest is supposed to check
> HV_HYPERCALL_AVAILABLE privilege bit before accessing
> HV_X64_MSR_GUEST_OS_ID/HV_X64_MSR_HYPERCALL MSRs but at least some
> Windows versions ignore that. As KVM is very permissive and allows
> accessing these MSRs unconditionally, no issue is observed. We may,
> however, want to tighten the checks eventually. Conforming to the
> spec is probably also a good idea.
>
> Enable HV_HYPERCALL_AVAILABLE bit unconditionally.
>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
--
Eduardo
- Re: [PATCH v7 3/9] i386: hardcode supported eVMCS version to '1', (continued)
- [PATCH v7 2/9] i386: clarify 'hv-passthrough' behavior, Vitaly Kuznetsov, 2021/06/03
- [PATCH v7 4/9] i386: make hyperv_expand_features() return bool, Vitaly Kuznetsov, 2021/06/03
- [PATCH v7 5/9] i386: expand Hyper-V features during CPU feature expansion time, Vitaly Kuznetsov, 2021/06/03
- [PATCH v7 6/9] i386: kill off hv_cpuid_check_and_set(), Vitaly Kuznetsov, 2021/06/03
- [PATCH v7 7/9] i386: HV_HYPERCALL_AVAILABLE privilege bit is always needed, Vitaly Kuznetsov, 2021/06/03
- Re: [PATCH v7 7/9] i386: HV_HYPERCALL_AVAILABLE privilege bit is always needed,
Eduardo Habkost <=
- [PATCH v7 8/9] i386: Hyper-V SynIC requires POST_MESSAGES/SIGNAL_EVENTS priviliges, Vitaly Kuznetsov, 2021/06/03
- Re: [PATCH v7 8/9] i386: Hyper-V SynIC requires POST_MESSAGES/SIGNAL_EVENTS priviliges, Eric Blake, 2021/06/04
- [PATCH v7 9/9] qtest/hyperv: Introduce a simple hyper-v test, Vitaly Kuznetsov, 2021/06/03