From: Paolo Bonzini <pbonzini@redhat.com>
To: Yu Zhang <yu.c.zhang@linux.intel.com>, kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, rkrcmar@redhat.com,
tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
xiaoguangrong@tencent.com, joro@8bytes.org
Subject: Re: [PATCH v3 2/5] KVM: MMU: check guest CR3 reserved bits based on its physical address width.
Date: Thu, 24 Aug 2017 15:40:04 +0200 [thread overview]
Message-ID: <0bce2df3-79ac-599b-19fa-8ebeaff23623@redhat.com> (raw)
In-Reply-To: <1503577676-12345-3-git-send-email-yu.c.zhang@linux.intel.com>
On 24/08/2017 14:27, Yu Zhang wrote:
> diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
> index 3ed6192..67e7ec2 100644
> --- a/arch/x86/kvm/mmu.h
> +++ b/arch/x86/kvm/mmu.h
> @@ -48,6 +48,9 @@
>
> static inline u64 rsvd_bits(int s, int e)
> {
> + if (e < s)
> + return 0;
> +
> return ((1ULL << (e - s + 1)) - 1) << s;
> }
e = s - 1 is already supported; why do you need e <= s - 2?
Paolo
next prev parent reply other threads:[~2017-08-24 13:40 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-24 12:27 [PATCH v3 0/5] KVM: MMU: 5 level EPT/shadow support Yu Zhang
2017-08-24 12:27 ` [PATCH v3 1/5] KVM: x86: Add return value to kvm_cpuid() Yu Zhang
2017-08-24 12:27 ` [PATCH v3 2/5] KVM: MMU: check guest CR3 reserved bits based on its physical address width Yu Zhang
2017-08-24 13:40 ` Paolo Bonzini [this message]
2017-08-24 15:23 ` Yu Zhang
2017-08-24 15:50 ` Paolo Bonzini
2017-08-24 15:38 ` Yu Zhang
2017-08-24 16:27 ` Paolo Bonzini
2017-08-24 16:21 ` Yu Zhang
2017-08-24 16:51 ` Paolo Bonzini
2017-09-15 23:19 ` Jim Mattson
2017-09-18 8:15 ` Yu Zhang
2017-09-18 8:41 ` Paolo Bonzini
2017-09-18 9:35 ` Yu Zhang
2017-08-24 12:27 ` [PATCH v3 3/5] KVM: MMU: Rename PT64_ROOT_LEVEL to PT64_ROOT_4LEVEL Yu Zhang
2017-08-24 12:27 ` [PATCH v3 4/5] KVM: MMU: Add 5 level EPT & Shadow page table support Yu Zhang
2017-08-24 13:42 ` Paolo Bonzini
2017-08-24 12:27 ` [PATCH v3 5/5] KVM: MMU: Expose the LA57 feature to VM Yu Zhang
2017-08-24 13:47 ` [PATCH v3 0/5] KVM: MMU: 5 level EPT/shadow support Paolo Bonzini
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