From: Anup Patel <apatel@ventanamicro.com>
To: Paolo Bonzini <pbonzini@redhat.com>, Atish Patra <atishp@atishpatra.org>
Cc: Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Andrew Jones <ajones@ventanamicro.com>,
Anup Patel <anup@brainfault.org>,
kvm@vger.kernel.org, kvm-riscv@lists.infradead.org,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
Anup Patel <apatel@ventanamicro.com>
Subject: [PATCH v3 5/8] RISC-V: KVM: Implement subtype for CSR ONE_REG interface
Date: Mon, 3 Apr 2023 15:03:07 +0530 [thread overview]
Message-ID: <20230403093310.2271142-6-apatel@ventanamicro.com> (raw)
In-Reply-To: <20230403093310.2271142-1-apatel@ventanamicro.com>
To make the CSR ONE_REG interface extensible, we implement subtype
for the CSR ONE_REG IDs. The existing CSR ONE_REG IDs are treated
as subtype = 0 (aka General CSRs).
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
arch/riscv/include/uapi/asm/kvm.h | 3 +-
arch/riscv/kvm/vcpu.c | 88 +++++++++++++++++++++++--------
2 files changed, 69 insertions(+), 22 deletions(-)
diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index 47a7c3958229..182023dc9a51 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -65,7 +65,7 @@ struct kvm_riscv_core {
#define KVM_RISCV_MODE_S 1
#define KVM_RISCV_MODE_U 0
-/* CSR registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
+/* General CSR registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
struct kvm_riscv_csr {
unsigned long sstatus;
unsigned long sie;
@@ -152,6 +152,7 @@ enum KVM_RISCV_SBI_EXT_ID {
/* Control and status registers are mapped as type 3 */
#define KVM_REG_RISCV_CSR (0x03 << KVM_REG_RISCV_TYPE_SHIFT)
+#define KVM_REG_RISCV_CSR_GENERAL (0x0 << KVM_REG_RISCV_SUBTYPE_SHIFT)
#define KVM_REG_RISCV_CSR_REG(name) \
(offsetof(struct kvm_riscv_csr, name) / sizeof(unsigned long))
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index 1fd54ec15622..aca6b4fb7519 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -460,27 +460,72 @@ static int kvm_riscv_vcpu_set_reg_core(struct kvm_vcpu *vcpu,
return 0;
}
+static int kvm_riscv_vcpu_general_get_csr(struct kvm_vcpu *vcpu,
+ unsigned long reg_num,
+ unsigned long *out_val)
+{
+ struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
+
+ if (reg_num >= sizeof(struct kvm_riscv_csr) / sizeof(unsigned long))
+ return -EINVAL;
+
+ if (reg_num == KVM_REG_RISCV_CSR_REG(sip)) {
+ kvm_riscv_vcpu_flush_interrupts(vcpu);
+ *out_val = (csr->hvip >> VSIP_TO_HVIP_SHIFT) & VSIP_VALID_MASK;
+ } else
+ *out_val = ((unsigned long *)csr)[reg_num];
+
+ return 0;
+}
+
+static inline int kvm_riscv_vcpu_general_set_csr(struct kvm_vcpu *vcpu,
+ unsigned long reg_num,
+ unsigned long reg_val)
+{
+ struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
+
+ if (reg_num >= sizeof(struct kvm_riscv_csr) / sizeof(unsigned long))
+ return -EINVAL;
+
+ if (reg_num == KVM_REG_RISCV_CSR_REG(sip)) {
+ reg_val &= VSIP_VALID_MASK;
+ reg_val <<= VSIP_TO_HVIP_SHIFT;
+ }
+
+ ((unsigned long *)csr)[reg_num] = reg_val;
+
+ if (reg_num == KVM_REG_RISCV_CSR_REG(sip))
+ WRITE_ONCE(vcpu->arch.irqs_pending_mask, 0);
+
+ return 0;
+}
+
static int kvm_riscv_vcpu_get_reg_csr(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
- struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
+ int rc;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_CSR);
- unsigned long reg_val;
+ unsigned long reg_val, reg_subtype;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
- if (reg_num >= sizeof(struct kvm_riscv_csr) / sizeof(unsigned long))
- return -EINVAL;
- if (reg_num == KVM_REG_RISCV_CSR_REG(sip)) {
- kvm_riscv_vcpu_flush_interrupts(vcpu);
- reg_val = (csr->hvip >> VSIP_TO_HVIP_SHIFT) & VSIP_VALID_MASK;
- } else
- reg_val = ((unsigned long *)csr)[reg_num];
+ reg_subtype = reg_num & KVM_REG_RISCV_SUBTYPE_MASK;
+ reg_num &= ~KVM_REG_RISCV_SUBTYPE_MASK;
+ switch (reg_subtype) {
+ case KVM_REG_RISCV_CSR_GENERAL:
+ rc = kvm_riscv_vcpu_general_get_csr(vcpu, reg_num, ®_val);
+ break;
+ default:
+ rc = -EINVAL;
+ break;
+ }
+ if (rc)
+ return rc;
if (copy_to_user(uaddr, ®_val, KVM_REG_SIZE(reg->id)))
return -EFAULT;
@@ -491,31 +536,32 @@ static int kvm_riscv_vcpu_get_reg_csr(struct kvm_vcpu *vcpu,
static int kvm_riscv_vcpu_set_reg_csr(struct kvm_vcpu *vcpu,
const struct kvm_one_reg *reg)
{
- struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
+ int rc;
unsigned long __user *uaddr =
(unsigned long __user *)(unsigned long)reg->addr;
unsigned long reg_num = reg->id & ~(KVM_REG_ARCH_MASK |
KVM_REG_SIZE_MASK |
KVM_REG_RISCV_CSR);
- unsigned long reg_val;
+ unsigned long reg_val, reg_subtype;
if (KVM_REG_SIZE(reg->id) != sizeof(unsigned long))
return -EINVAL;
- if (reg_num >= sizeof(struct kvm_riscv_csr) / sizeof(unsigned long))
- return -EINVAL;
if (copy_from_user(®_val, uaddr, KVM_REG_SIZE(reg->id)))
return -EFAULT;
- if (reg_num == KVM_REG_RISCV_CSR_REG(sip)) {
- reg_val &= VSIP_VALID_MASK;
- reg_val <<= VSIP_TO_HVIP_SHIFT;
+ reg_subtype = reg_num & KVM_REG_RISCV_SUBTYPE_MASK;
+ reg_num &= ~KVM_REG_RISCV_SUBTYPE_MASK;
+ switch (reg_subtype) {
+ case KVM_REG_RISCV_CSR_GENERAL:
+ rc = kvm_riscv_vcpu_general_set_csr(vcpu, reg_num, reg_val);
+ break;
+ default:
+ rc = -EINVAL;
+ break;
}
-
- ((unsigned long *)csr)[reg_num] = reg_val;
-
- if (reg_num == KVM_REG_RISCV_CSR_REG(sip))
- WRITE_ONCE(vcpu->arch.irqs_pending_mask, 0);
+ if (rc)
+ return rc;
return 0;
}
--
2.34.1
next prev parent reply other threads:[~2023-04-03 9:34 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-03 9:33 [PATCH v3 0/8] RISC-V KVM virtualize AIA CSRs Anup Patel
2023-04-03 9:33 ` [PATCH v3 1/8] RISC-V: Add AIA related CSR defines Anup Patel
2023-04-03 9:33 ` [PATCH v3 2/8] RISC-V: Detect AIA CSRs from ISA string Anup Patel
2023-04-03 9:39 ` Conor Dooley
2023-04-03 12:05 ` Anup Patel
2023-04-03 9:33 ` [PATCH v3 3/8] RISC-V: KVM: Drop the _MASK suffix from hgatp.VMID mask defines Anup Patel
2023-04-03 9:33 ` [PATCH v3 4/8] RISC-V: KVM: Initial skeletal support for AIA Anup Patel
2023-04-03 12:00 ` Andrew Jones
2023-04-03 23:49 ` Atish Patra
2023-04-04 3:22 ` Anup Patel
2023-04-03 9:33 ` Anup Patel [this message]
2023-04-03 12:18 ` [PATCH v3 5/8] RISC-V: KVM: Implement subtype for CSR ONE_REG interface Andrew Jones
2023-04-04 0:54 ` Atish Patra
2023-04-03 9:33 ` [PATCH v3 6/8] RISC-V: KVM: Add ONE_REG interface for AIA CSRs Anup Patel
2023-04-03 11:31 ` Andrew Jones
2023-04-03 12:04 ` Anup Patel
2023-04-03 12:23 ` Andrew Jones
2023-04-04 11:52 ` Andrew Jones
2023-04-04 11:58 ` Conor Dooley
2023-04-05 9:28 ` Conor Dooley
2023-04-04 12:03 ` Andrew Jones
2023-04-03 12:27 ` Andrew Jones
2023-04-04 0:55 ` Atish Patra
2023-04-03 9:33 ` [PATCH v3 7/8] RISC-V: KVM: Virtualize per-HART " Anup Patel
2023-04-03 16:37 ` Andrew Jones
2023-04-04 13:31 ` Anup Patel
2023-04-04 13:54 ` Anup Patel
2023-04-03 9:33 ` [PATCH v3 8/8] RISC-V: KVM: Implement guest external interrupt line management Anup Patel
2023-04-04 12:45 ` Andrew Jones
2023-04-04 13:52 ` Anup Patel
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