linux-kernel - [RFC 04/48] RISC-V: KVM: Add a helper function to get pgd size

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Message-Id: <20230419221716.3603068-5-atishp@rivosinc.com>
Date:   Wed, 19 Apr 2023 15:16:32 -0700
From:   Atish Patra <atishp@...osinc.com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atishp@...osinc.com>, Alexandre Ghiti <alex@...ti.fr>,
        Andrew Jones <ajones@...tanamicro.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Björn Töpel <bjorn@...osinc.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-coco@...ts.linux.dev, Dylan Reid <dylan@...osinc.com>,
        abrestic@...osinc.com, Samuel Ortiz <sameo@...osinc.com>,
        Christoph Hellwig <hch@...radead.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guo Ren <guoren@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
        Jiri Slaby <jirislaby@...nel.org>,
        kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        Mayuresh Chitale <mchitale@...tanamicro.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rajnesh Kanwal <rkanwal@...osinc.com>,
        Uladzislau Rezki <urezki@...il.com>
Subject: [RFC 04/48] RISC-V: KVM: Add a helper function to get pgd size

The cove support will require to find out the pgd size to be used for
the gstage page table directory. Export the value via an additional
helper.

Signed-off-by: Atish Patra <atishp@...osinc.com>
---
 arch/riscv/include/asm/kvm_host.h | 1 +
 arch/riscv/kvm/mmu.c              | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
index 8714325..63c46af 100644
--- a/arch/riscv/include/asm/kvm_host.h
+++ b/arch/riscv/include/asm/kvm_host.h
@@ -313,6 +313,7 @@ void kvm_riscv_gstage_update_hgatp(struct kvm_vcpu *vcpu);
 void __init kvm_riscv_gstage_mode_detect(void);
 unsigned long __init kvm_riscv_gstage_mode(void);
 int kvm_riscv_gstage_gpa_bits(void);
+unsigned long kvm_riscv_gstage_pgd_size(void);
 
 void __init kvm_riscv_gstage_vmid_detect(void);
 unsigned long kvm_riscv_gstage_vmid_bits(void);
diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c
index f0fff56..6b037f7 100644
--- a/arch/riscv/kvm/mmu.c
+++ b/arch/riscv/kvm/mmu.c
@@ -797,3 +797,8 @@ int kvm_riscv_gstage_gpa_bits(void)
 {
 	return gstage_gpa_bits;
 }
+
+unsigned long kvm_riscv_gstage_pgd_size(void)
+{
+	return gstage_pgd_size;
+}
-- 
2.25.1