diff mbox series

[v6,3/4] kvm: arm64: set io memory s2 pte as normalnc for vfio pci device

Message ID 20240207204652.22954-4-ankita@nvidia.com (mailing list archive)
State New
Headers show
Series kvm: arm64: allow the VM to select DEVICE_* and NORMAL_NC for IO memory | expand

Commit Message

Ankit Agrawal Feb. 7, 2024, 8:46 p.m. UTC 
From: Ankit Agrawal <ankita@nvidia.com>

To provide VM with the ability to get device IO memory with NormalNC
property, map device MMIO in KVM for ARM64 at stage2 as NormalNC.
Having NormalNC S2 default puts guests in control (based on [1],
"Combining stage 1 and stage 2 memory type attributes") of device
MMIO regions memory mappings. The rules are summarized below:
([(S1) - stage1], [(S2) - stage 2])

S1           |  S2           | Result
NORMAL-WB    |  NORMAL-NC    | NORMAL-NC
NORMAL-WT    |  NORMAL-NC    | NORMAL-NC
NORMAL-NC    |  NORMAL-NC    | NORMAL-NC
DEVICE<attr> |  NORMAL-NC    | DEVICE<attr>

Still this cannot be generalized to non PCI devices such as GICv2.
There is insufficient information and uncertainity in the behavior
of non PCI driver. A driver must indicate support using the
new flag VM_VFIO_ALLOW_WC.

Adapt KVM to make use of the flag VM_VFIO_ALLOW_WC as indicator to
activate the S2 setting to NormalNc.

[1] section D8.5.5 of DDI0487J_a_a-profile_architecture_reference_manual.pdf

Signed-off-by: Ankit Agrawal <ankita@nvidia.com>
Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Jason Gunthorpe <jgg@nvidia.com>
---
 arch/arm64/kvm/mmu.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

Comments

Oliver Upton Feb. 8, 2024, 1:26 p.m. UTC | #1 
On Thu, Feb 08, 2024 at 02:16:51AM +0530, ankita@nvidia.com wrote:
> @@ -1557,10 +1559,18 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
>  	if (exec_fault)
>  		prot |= KVM_PGTABLE_PROT_X;
>  
> -	if (device)
> -		prot |= KVM_PGTABLE_PROT_DEVICE;
> -	else if (cpus_have_final_cap(ARM64_HAS_CACHE_DIC))
> +	if (device) {
> +		/*
> +		 * To provide VM with the ability to get device IO memory
> +		 * with NormalNC property, map device MMIO as NormalNC in S2.
> +		 */

nit: the comment doesn't provide anything of value, the logic is rather
straightforward here.

> +		if (vfio_allow_wc)
> +			prot |= KVM_PGTABLE_PROT_NORMAL_NC;
> +		else
> +			prot |= KVM_PGTABLE_PROT_DEVICE;
> +	} else if (cpus_have_final_cap(ARM64_HAS_CACHE_DIC)) {
>  		prot |= KVM_PGTABLE_PROT_X;
> +	}
>  
>  	/*
>  	 * Under the premise of getting a FSC_PERM fault, we just need to relax
> -- 
> 2.34.1
>
Catalin Marinas Feb. 8, 2024, 2:51 p.m. UTC | #2 
On Thu, Feb 08, 2024 at 02:16:51AM +0530, ankita@nvidia.com wrote:
> diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
> index d14504821b79..e1e6847a793b 100644
> --- a/arch/arm64/kvm/mmu.c
> +++ b/arch/arm64/kvm/mmu.c
> @@ -1381,7 +1381,7 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
>  	int ret = 0;
>  	bool write_fault, writable, force_pte = false;
>  	bool exec_fault, mte_allowed;
> -	bool device = false;
> +	bool device = false, vfio_allow_wc = false;
>  	unsigned long mmu_seq;
>  	struct kvm *kvm = vcpu->kvm;
>  	struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
> @@ -1472,6 +1472,8 @@ static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
>  	gfn = fault_ipa >> PAGE_SHIFT;
>  	mte_allowed = kvm_vma_mte_allowed(vma);
>  
> +	vfio_allow_wc = (vma->vm_flags & VM_VFIO_ALLOW_WC);

Nitpick: no need for brackets, '=' has a pretty low precedence.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Ankit Agrawal Feb. 9, 2024, 2:05 p.m. UTC | #3 
>> +		/*
>> +		 * To provide VM with the ability to get device IO memory
>> +		 * with NormalNC property, map device MMIO as NormalNC in S2.
>> +		 */
>
> nit: the comment doesn't provide anything of value, the logic is rather
> straightforward here.

Sure, will remove it.

>>
>> +     vfio_allow_wc = (vma->vm_flags & VM_VFIO_ALLOW_WC);
>
> Nitpick: no need for brackets, '=' has a pretty low precedence.
> 
> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>

Will change it. Thanks for the review.
diff mbox series

Patch

diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index d14504821b79..e1e6847a793b 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c
@@ -1381,7 +1381,7 @@  static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 	int ret = 0;
 	bool write_fault, writable, force_pte = false;
 	bool exec_fault, mte_allowed;
-	bool device = false;
+	bool device = false, vfio_allow_wc = false;
 	unsigned long mmu_seq;
 	struct kvm *kvm = vcpu->kvm;
 	struct kvm_mmu_memory_cache *memcache = &vcpu->arch.mmu_page_cache;
@@ -1472,6 +1472,8 @@  static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 	gfn = fault_ipa >> PAGE_SHIFT;
 	mte_allowed = kvm_vma_mte_allowed(vma);
 
+	vfio_allow_wc = (vma->vm_flags & VM_VFIO_ALLOW_WC);
+
 	/* Don't use the VMA after the unlock -- it may have vanished */
 	vma = NULL;
 
@@ -1557,10 +1559,18 @@  static int user_mem_abort(struct kvm_vcpu *vcpu, phys_addr_t fault_ipa,
 	if (exec_fault)
 		prot |= KVM_PGTABLE_PROT_X;
 
-	if (device)
-		prot |= KVM_PGTABLE_PROT_DEVICE;
-	else if (cpus_have_final_cap(ARM64_HAS_CACHE_DIC))
+	if (device) {
+		/*
+		 * To provide VM with the ability to get device IO memory
+		 * with NormalNC property, map device MMIO as NormalNC in S2.
+		 */
+		if (vfio_allow_wc)
+			prot |= KVM_PGTABLE_PROT_NORMAL_NC;
+		else
+			prot |= KVM_PGTABLE_PROT_DEVICE;
+	} else if (cpus_have_final_cap(ARM64_HAS_CACHE_DIC)) {
 		prot |= KVM_PGTABLE_PROT_X;
+	}
 
 	/*
 	 * Under the premise of getting a FSC_PERM fault, we just need to relax