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From: Quentin Perret <qperret@google.com>
To: Will Deacon <will@kernel.org>
Cc: catalin.marinas@arm.com, maz@kernel.org, james.morse@arm.com,
	julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com,
	android-kvm@google.com, linux-kernel@vger.kernel.org,
	kernel-team@android.com, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, tabba@google.com,
	mark.rutland@arm.com, dbrazdil@google.com, mate.toth-pal@arm.com,
	seanjc@google.com, robh+dt@kernel.org
Subject: Re: [PATCH v3 24/32] KVM: arm64: Reserve memory for host stage 2
Date: Fri, 5 Mar 2021 09:17:16 +0000	[thread overview]
Message-ID: <YEH3HNn9+Y3UbKPj@google.com> (raw)
In-Reply-To: <20210304194953.GD21950@willie-the-truck>

On Thursday 04 Mar 2021 at 19:49:53 (+0000), Will Deacon wrote:
> On Tue, Mar 02, 2021 at 02:59:54PM +0000, Quentin Perret wrote:
> > Extend the memory pool allocated for the hypervisor to include enough
> > pages to map all of memory at page granularity for the host stage 2.
> > While at it, also reserve some memory for device mappings.
> > 
> > Signed-off-by: Quentin Perret <qperret@google.com>
> > ---
> >  arch/arm64/kvm/hyp/include/nvhe/mm.h | 23 ++++++++++++++++++++++-
> >  arch/arm64/kvm/hyp/nvhe/setup.c      | 12 ++++++++++++
> >  arch/arm64/kvm/hyp/reserved_mem.c    |  2 ++
> >  3 files changed, 36 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm64/kvm/hyp/include/nvhe/mm.h b/arch/arm64/kvm/hyp/include/nvhe/mm.h
> > index ac0f7fcffd08..411a35db949c 100644
> > --- a/arch/arm64/kvm/hyp/include/nvhe/mm.h
> > +++ b/arch/arm64/kvm/hyp/include/nvhe/mm.h
> > @@ -53,7 +53,7 @@ static inline unsigned long __hyp_pgtable_max_pages(unsigned long nr_pages)
> >  	return total;
> >  }
> >  
> > -static inline unsigned long hyp_s1_pgtable_pages(void)
> > +static inline unsigned long __hyp_pgtable_total_pages(void)
> >  {
> >  	unsigned long res = 0, i;
> >  
> > @@ -63,9 +63,30 @@ static inline unsigned long hyp_s1_pgtable_pages(void)
> >  		res += __hyp_pgtable_max_pages(reg->size >> PAGE_SHIFT);
> >  	}
> >  
> > +	return res;
> > +}
> > +
> > +static inline unsigned long hyp_s1_pgtable_pages(void)
> > +{
> > +	unsigned long res;
> > +
> > +	res = __hyp_pgtable_total_pages();
> > +
> >  	/* Allow 1 GiB for private mappings */
> >  	res += __hyp_pgtable_max_pages(SZ_1G >> PAGE_SHIFT);
> >  
> >  	return res;
> >  }
> > +
> > +static inline unsigned long host_s2_mem_pgtable_pages(void)
> > +{
> > +	return __hyp_pgtable_total_pages() + 16;
> 
> Is this 16 due to the possibility of a concatenated pgd?

Yes it is, to be sure we have a safe upper-bound.

> If so, please add a comment to that effect.

Will do, thanks.
Quentin

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  reply	other threads:[~2021-03-05  9:18 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-02 14:59 [PATCH v3 00/32] KVM: arm64: A stage 2 for the host Quentin Perret
2021-03-02 14:59 ` [PATCH v3 01/32] arm64: lib: Annotate {clear, copy}_page() as position-independent Quentin Perret
2021-03-02 14:59 ` [PATCH v3 02/32] KVM: arm64: Link position-independent string routines into .hyp.text Quentin Perret
2021-03-02 14:59 ` [PATCH v3 03/32] arm64: kvm: Add standalone ticket spinlock implementation for use at hyp Quentin Perret
2021-03-02 14:59 ` [PATCH v3 04/32] KVM: arm64: Initialize kvm_nvhe_init_params early Quentin Perret
2021-03-04 13:39   ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 05/32] KVM: arm64: Avoid free_page() in page-table allocator Quentin Perret
2021-03-02 14:59 ` [PATCH v3 06/32] KVM: arm64: Factor memory allocation out of pgtable.c Quentin Perret
2021-03-04 14:06   ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 07/32] KVM: arm64: Introduce a BSS section for use at Hyp Quentin Perret
2021-03-04 14:09   ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 08/32] KVM: arm64: Make kvm_call_hyp() a function call " Quentin Perret
2021-03-02 14:59 ` [PATCH v3 09/32] KVM: arm64: Allow using kvm_nvhe_sym() in hyp code Quentin Perret
2021-03-02 14:59 ` [PATCH v3 10/32] KVM: arm64: Introduce an early Hyp page allocator Quentin Perret
2021-03-04 14:38   ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 11/32] KVM: arm64: Stub CONFIG_DEBUG_LIST at Hyp Quentin Perret
2021-03-02 14:59 ` [PATCH v3 12/32] KVM: arm64: Introduce a Hyp buddy page allocator Quentin Perret
2021-03-04 15:30   ` Will Deacon
2021-03-04 15:49     ` Quentin Perret
2021-03-02 14:59 ` [PATCH v3 13/32] KVM: arm64: Enable access to sanitized CPU features at EL2 Quentin Perret
2021-03-02 14:59 ` [PATCH v3 14/32] KVM: arm64: Factor out vector address calculation Quentin Perret
2021-03-02 14:59 ` [PATCH v3 15/32] KVM: arm64: Prepare the creation of s1 mappings at EL2 Quentin Perret
2021-03-04 18:47   ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 16/32] KVM: arm64: Elevate hypervisor mappings creation " Quentin Perret
2021-03-04 19:25   ` Will Deacon
2021-03-05  9:14     ` Quentin Perret
2021-03-02 14:59 ` [PATCH v3 17/32] KVM: arm64: Use kvm_arch for stage 2 pgtable Quentin Perret
2021-03-02 14:59 ` [PATCH v3 18/32] KVM: arm64: Use kvm_arch in kvm_s2_mmu Quentin Perret
2021-03-02 14:59 ` [PATCH v3 19/32] KVM: arm64: Set host stage 2 using kvm_nvhe_init_params Quentin Perret
2021-03-02 14:59 ` [PATCH v3 20/32] KVM: arm64: Refactor kvm_arm_setup_stage2() Quentin Perret
2021-03-04 19:35   ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 21/32] KVM: arm64: Refactor __load_guest_stage2() Quentin Perret
2021-03-02 14:59 ` [PATCH v3 22/32] KVM: arm64: Refactor __populate_fault_info() Quentin Perret
2021-03-04 19:39   ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 23/32] KVM: arm64: Make memcache anonymous in pgtable allocator Quentin Perret
2021-03-04 19:44   ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 24/32] KVM: arm64: Reserve memory for host stage 2 Quentin Perret
2021-03-04 19:49   ` Will Deacon
2021-03-05  9:17     ` Quentin Perret [this message]
2021-03-02 14:59 ` [PATCH v3 25/32] KVM: arm64: Sort the hypervisor memblocks Quentin Perret
2021-03-04 19:51   ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 26/32] KVM: arm64: Introduce PROT_NONE mappings for stage 2 Quentin Perret
2021-03-04 20:00   ` Will Deacon
2021-03-05  9:52     ` Quentin Perret
2021-03-05 19:03       ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 27/32] KVM: arm64: Refactor stage2_map_set_prot_attr() Quentin Perret
2021-03-04 20:03   ` Will Deacon
2021-03-05  9:18     ` Quentin Perret
2021-03-02 14:59 ` [PATCH v3 28/32] KVM: arm64: Add kvm_pgtable_stage2_idmap_greedy() Quentin Perret
2021-03-05 14:39   ` Will Deacon
2021-03-05 15:03     ` Quentin Perret
2021-03-05 16:59       ` Will Deacon
2021-03-02 14:59 ` [PATCH v3 29/32] KVM: arm64: Wrap the host with a stage 2 Quentin Perret
2021-03-05 19:29   ` Will Deacon
2021-03-08  9:22     ` Quentin Perret
2021-03-08 12:46       ` Will Deacon
2021-03-08 13:38         ` Quentin Perret
2021-03-08 13:52           ` Will Deacon
2021-03-02 15:00 ` [PATCH v3 30/32] KVM: arm64: Page-align the .hyp sections Quentin Perret
2021-03-04 20:05   ` Will Deacon
2021-03-02 15:00 ` [PATCH v3 31/32] KVM: arm64: Disable PMU support in protected mode Quentin Perret
2021-03-05 19:02   ` Will Deacon
2021-03-02 15:00 ` [PATCH v3 32/32] KVM: arm64: Protect the .hyp sections from the host Quentin Perret
2021-03-05 19:13   ` Will Deacon

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