From: Mayuresh Chitale <mchitale@ventanamicro.com>
To: Palmer Dabbelt <palmer@dabbelt.com>, Anup Patel <anup@brainfault.org>
Cc: Mayuresh Chitale <mchitale@ventanamicro.com>,
Andrew Jones <ajones@ventanamicro.com>,
Atish Patra <atishp@atishpatra.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Albert Ou <aou@eecs.berkeley.edu>,
linux-riscv@lists.infradead.org, kvm-riscv@lists.infradead.org
Subject: [PATCH v1 5/6] RISCV: KVM: Add sstateen0 context save/restore
Date: Wed, 19 Jul 2023 21:33:15 +0530 [thread overview]
Message-ID: <20230719160316.4048022-6-mchitale@ventanamicro.com> (raw)
In-Reply-To: <20230719160316.4048022-1-mchitale@ventanamicro.com>
Define sstateen0 and add sstateen0 save/restore for guest VCPUs.
Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
arch/riscv/include/asm/csr.h | 1 +
arch/riscv/include/asm/kvm_host.h | 8 ++++++++
arch/riscv/kvm/vcpu.c | 10 ++++++++++
3 files changed, 19 insertions(+)
diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h
index b52270278733..5168f37d8e75 100644
--- a/arch/riscv/include/asm/csr.h
+++ b/arch/riscv/include/asm/csr.h
@@ -286,6 +286,7 @@
#define CSR_STVEC 0x105
#define CSR_SCOUNTEREN 0x106
#define CSR_SENVCFG 0x10a
+#define CSR_SSTATEEN0 0x10c
#define CSR_SSCRATCH 0x140
#define CSR_SEPC 0x141
#define CSR_SCAUSE 0x142
diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h
index c3cc0cb39cf8..c9837772b109 100644
--- a/arch/riscv/include/asm/kvm_host.h
+++ b/arch/riscv/include/asm/kvm_host.h
@@ -170,6 +170,10 @@ struct kvm_vcpu_config {
u64 hstateen0;
};
+struct kvm_vcpu_smstateen_csr {
+ unsigned long sstateen0;
+};
+
struct kvm_vcpu_arch {
/* VCPU ran at least once */
bool ran_atleast_once;
@@ -190,6 +194,7 @@ struct kvm_vcpu_arch {
unsigned long host_stvec;
unsigned long host_scounteren;
unsigned long host_senvcfg;
+ unsigned long host_sstateen0;
/* CPU context of Host */
struct kvm_cpu_context host_context;
@@ -200,6 +205,9 @@ struct kvm_vcpu_arch {
/* CPU CSR context of Guest VCPU */
struct kvm_vcpu_csr guest_csr;
+ /* CPU Smstateen CSR context of Guest VCPU */
+ struct kvm_vcpu_smstateen_csr smstateen_csr;
+
/* CPU context upon Guest VCPU reset */
struct kvm_cpu_context guest_reset_context;
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index 37f1ed70d782..ae750decbefe 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -1138,14 +1138,24 @@ static void kvm_riscv_update_hvip(struct kvm_vcpu *vcpu)
*/
static void noinstr kvm_riscv_vcpu_enter_exit(struct kvm_vcpu *vcpu)
{
+ struct kvm_vcpu_smstateen_csr *smcsr = &vcpu->arch.smstateen_csr;
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
+ struct kvm_vcpu_config *cfg = &vcpu->arch.cfg;
vcpu->arch.host_senvcfg = csr_swap(CSR_SENVCFG, csr->senvcfg);
+ if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN) &&
+ (cfg->hstateen0 & SMSTATEEN0_SSTATEEN0))
+ vcpu->arch.host_sstateen0 = csr_swap(CSR_SSTATEEN0,
+ smcsr->sstateen0);
guest_state_enter_irqoff();
__kvm_riscv_switch_to(&vcpu->arch);
vcpu->arch.last_exit_cpu = vcpu->cpu;
guest_state_exit_irqoff();
csr->senvcfg = csr_swap(CSR_SENVCFG, vcpu->arch.host_senvcfg);
+ if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN) &&
+ (cfg->hstateen0 & SMSTATEEN0_SSTATEEN0))
+ smcsr->sstateen0 = csr_swap(CSR_SSTATEEN0,
+ vcpu->arch.host_sstateen0);
}
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
--
2.34.1
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next prev parent reply other threads:[~2023-07-19 16:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-19 16:03 [PATCH v1 0/6] Risc-V Kvm Smstateen Mayuresh Chitale
2023-07-19 16:03 ` [PATCH v1 1/6] RISC-V: Detect Smstateen extension Mayuresh Chitale
2023-07-19 16:27 ` Conor Dooley
2023-07-21 7:49 ` mchitale
2023-07-19 16:03 ` [PATCH v1 2/6] RISC-V: KVM: Add kvm_vcpu_config Mayuresh Chitale
2023-07-19 16:03 ` [PATCH v1 3/6] RISC-V: KVM: Enable Smstateen accesses Mayuresh Chitale
2023-07-19 16:03 ` [PATCH v1 4/6] RISCV: KVM: Add senvcfg context save/restore Mayuresh Chitale
2023-07-19 16:03 ` Mayuresh Chitale [this message]
2023-07-19 16:03 ` [PATCH v1 6/6] RISCV: KVM: Add sstateen0 to ONE_REG Mayuresh Chitale
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