linux-kernel - Re: [PATCH 03/34] KVM: Use gfn instead of hva for mmu_notifier

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Message-ID: <814958af6bf6b00752a715da74a0cb85efded1aa.camel@intel.com>
Date:   Mon, 6 Nov 2023 09:29:42 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
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Subject: Re: [PATCH 03/34] KVM: Use gfn instead of hva for mmu_notifier_retry

On Sun, 2023-11-05 at 17:30 +0100, Paolo Bonzini wrote:
> From: Chao Peng <chao.p.peng@...ux.intel.com>
> 
> Currently in mmu_notifier invalidate path, hva range is recorded and then
> checked against by mmu_invalidate_retry_hva() in the page fault handling
> path. However, for the soon-to-be-introduced private memory, a page fault
> may not have a hva associated, checking gfn(gpa) makes more sense.
> 
> For existing hva based shared memory, gfn is expected to also work. The
> only downside is when aliasing multiple gfns to a single hva, the
> current algorithm of checking multiple ranges could result in a much
> larger range being rejected. Such aliasing should be uncommon, so the
> impact is expected small.
> 
> Suggested-by: Sean Christopherson <seanjc@...gle.com>
> Cc: Xu Yilun <yilun.xu@...el.com>
> Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
> Reviewed-by: Fuad Tabba <tabba@...gle.com>
> Tested-by: Fuad Tabba <tabba@...gle.com>
> [sean: convert vmx_set_apic_access_page_addr() to gfn-based API]
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
> Reviewed-by: Xu Yilun <yilun.xu@...ux.intel.com>
> Message-Id: <20231027182217.3615211-4-seanjc@...gle.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> 

Reviewed-by: Kai Huang <kai.huang@...el.com>