linux-kernel - [PATCH v6 11/29] KVM: RISC-V: Use "new" memslot instead of userspace memory region

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Message-Id: <42c8a630e4200f9777e0bf8f3bc2680b3379b443.1638304316.git.maciej.szmigiero@oracle.com>
Date:   Tue, 30 Nov 2021 22:41:24 +0100
From:   "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Igor Mammedov <imammedo@...hat.com>,
        Marc Zyngier <maz@...nel.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Aleksandar Markovic <aleksandar.qemu.devel@...il.com>,
        Paul Mackerras <paulus@...abs.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Anup Patel <anup.patel@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Atish Patra <atish.patra@....com>,
        Ben Gardon <bgardon@...gle.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v6 11/29] KVM: RISC-V: Use "new" memslot instead of userspace memory region

From: Sean Christopherson <seanjc@...gle.com>

Get the slot ID, hva, etc... from the "new" memslot instead of the
userspace memory region when preparing/committing a memory region.  This
will allow a future commit to drop @mem from the prepare/commit hooks
once all architectures convert to using "new".

Opportunistically wait to get the various "new" values until after
filtering out the DELETE case in anticipation of a future commit passing
NULL for @new when deleting a memslot.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@...cle.com>
---
 arch/riscv/kvm/mmu.c | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index 50380f525345..573ade138204 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -472,8 +472,8 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
 	 * allocated dirty_bitmap[], dirty pages will be tracked while
 	 * the memory slot is write protected.
 	 */
-	if (change != KVM_MR_DELETE && mem->flags & KVM_MEM_LOG_DIRTY_PAGES)
-		stage2_wp_memory_region(kvm, mem->slot);
+	if (change != KVM_MR_DELETE && new->flags & KVM_MEM_LOG_DIRTY_PAGES)
+		stage2_wp_memory_region(kvm, new->id);
 }
 
 int kvm_arch_prepare_memory_region(struct kvm *kvm,
@@ -482,9 +482,9 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 				struct kvm_memory_slot *new,
 				enum kvm_mr_change change)
 {
-	hva_t hva = mem->userspace_addr;
-	hva_t reg_end = hva + mem->memory_size;
-	bool writable = !(mem->flags & KVM_MEM_READONLY);
+	hva_t hva, reg_end, size;
+	gpa_t base_gpa;
+	bool writable;
 	int ret = 0;
 
 	if (change != KVM_MR_CREATE && change != KVM_MR_MOVE &&
@@ -499,6 +499,12 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 	    (stage2_gpa_size >> PAGE_SHIFT))
 		return -EFAULT;
 
+	hva = new->userspace_addr;
+	size = new->npages << PAGE_SHIFT;
+	reg_end = hva + size;
+	base_gpa = new->base_gfn << PAGE_SHIFT;
+	writable = !(new->flags & KVM_MEM_READONLY);
+
 	mmap_read_lock(current->mm);
 
 	/*
@@ -534,8 +540,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 		vm_end = min(reg_end, vma->vm_end);
 
 		if (vma->vm_flags & VM_PFNMAP) {
-			gpa_t gpa = mem->guest_phys_addr +
-				    (vm_start - mem->userspace_addr);
+			gpa_t gpa = base_gpa + (vm_start - hva);
 			phys_addr_t pa;
 
 			pa = (phys_addr_t)vma->vm_pgoff << PAGE_SHIFT;
@@ -560,8 +565,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
 
 	spin_lock(&kvm->mmu_lock);
 	if (ret)
-		stage2_unmap_range(kvm, mem->guest_phys_addr,
-				   mem->memory_size, false);
+		stage2_unmap_range(kvm, base_gpa, size, false);
 	spin_unlock(&kvm->mmu_lock);
 
 out: