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RISCV: KVM: Add sstateen0 context save/restore

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Define sstateen0 and add sstateen0 save/restore for guest VCPUs.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Mayuresh Chitale 2023-09-13 22:09:04 +05:30 • committed by Anup Patel
parent db3c01c7a3
commit 81f0f314fe
3 changed files with 21 additions and 0 deletions
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1
arch/riscv/include/asm/csr.h
View file

@ -288,6 +288,7 @@
#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

8
arch/riscv/include/asm/kvm_host.h
View file

@ -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;

12
arch/riscv/kvm/vcpu.c
View file

@ -621,16 +621,28 @@ static void kvm_riscv_update_hvip(struct kvm_vcpu *vcpu)
static __always_inline void kvm_riscv_vcpu_swap_in_guest_state(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);
}
static __always_inline void kvm_riscv_vcpu_swap_in_host_state(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;
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);
}
/*