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RISC-V: KVM: Implement VCPU create, init and destroy functions

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This patch implements VCPU create, init and destroy functions
required by generic KVM module. We don't have much dynamic
resources in struct kvm_vcpu_arch so these functions are quite
simple for KVM RISC-V.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Alexander Graf <graf@amazon.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Anup Patel 2021-09-27 17:10:02 +05:30 committed by Anup Patel
parent 99cdc6c18c
commit a33c72faf2
2 changed files with 115 additions and 9 deletions
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69
arch/riscv/include/asm/kvm_host.h
View file

@ -57,7 +57,76 @@ struct kvm_cpu_trap {
unsigned long htinst;
};
struct kvm_cpu_context {
unsigned long zero;
unsigned long ra;
unsigned long sp;
unsigned long gp;
unsigned long tp;
unsigned long t0;
unsigned long t1;
unsigned long t2;
unsigned long s0;
unsigned long s1;
unsigned long a0;
unsigned long a1;
unsigned long a2;
unsigned long a3;
unsigned long a4;
unsigned long a5;
unsigned long a6;
unsigned long a7;
unsigned long s2;
unsigned long s3;
unsigned long s4;
unsigned long s5;
unsigned long s6;
unsigned long s7;
unsigned long s8;
unsigned long s9;
unsigned long s10;
unsigned long s11;
unsigned long t3;
unsigned long t4;
unsigned long t5;
unsigned long t6;
unsigned long sepc;
unsigned long sstatus;
unsigned long hstatus;
};
struct kvm_vcpu_csr {
unsigned long vsstatus;
unsigned long vsie;
unsigned long vstvec;
unsigned long vsscratch;
unsigned long vsepc;
unsigned long vscause;
unsigned long vstval;
unsigned long hvip;
unsigned long vsatp;
unsigned long scounteren;
};
struct kvm_vcpu_arch {
/* VCPU ran at least once */
bool ran_atleast_once;
/* ISA feature bits (similar to MISA) */
unsigned long isa;
/* CPU context of Guest VCPU */
struct kvm_cpu_context guest_context;
/* CPU CSR context of Guest VCPU */
struct kvm_vcpu_csr guest_csr;
/* CPU context upon Guest VCPU reset */
struct kvm_cpu_context guest_reset_context;
/* CPU CSR context upon Guest VCPU reset */
struct kvm_vcpu_csr guest_reset_csr;
/* Don't run the VCPU (blocked) */
bool pause;

55
arch/riscv/kvm/vcpu.c
View file

@ -38,6 +38,27 @@ const struct kvm_stats_header kvm_vcpu_stats_header = {
sizeof(kvm_vcpu_stats_desc),
};
#define KVM_RISCV_ISA_ALLOWED (riscv_isa_extension_mask(a) | \
riscv_isa_extension_mask(c) | \
riscv_isa_extension_mask(d) | \
riscv_isa_extension_mask(f) | \
riscv_isa_extension_mask(i) | \
riscv_isa_extension_mask(m) | \
riscv_isa_extension_mask(s) | \
riscv_isa_extension_mask(u))
static void kvm_riscv_reset_vcpu(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_csr *csr = &vcpu->arch.guest_csr;
struct kvm_vcpu_csr *reset_csr = &vcpu->arch.guest_reset_csr;
struct kvm_cpu_context *cntx = &vcpu->arch.guest_context;
struct kvm_cpu_context *reset_cntx = &vcpu->arch.guest_reset_context;
memcpy(csr, reset_csr, sizeof(*csr));
memcpy(cntx, reset_cntx, sizeof(*cntx));
}
int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
return 0;
@ -45,7 +66,25 @@ int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
/* TODO: */
struct kvm_cpu_context *cntx;
/* Mark this VCPU never ran */
vcpu->arch.ran_atleast_once = false;
/* Setup ISA features available to VCPU */
vcpu->arch.isa = riscv_isa_extension_base(NULL) & KVM_RISCV_ISA_ALLOWED;
/* Setup reset state of shadow SSTATUS and HSTATUS CSRs */
cntx = &vcpu->arch.guest_reset_context;
cntx->sstatus = SR_SPP | SR_SPIE;
cntx->hstatus = 0;
cntx->hstatus |= HSTATUS_VTW;
cntx->hstatus |= HSTATUS_SPVP;
cntx->hstatus |= HSTATUS_SPV;
/* Reset VCPU */
kvm_riscv_reset_vcpu(vcpu);
return 0;
}
@ -53,15 +92,10 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
}
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
/* TODO: */
return 0;
}
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
/* TODO: */
/* Flush the pages pre-allocated for Stage2 page table mappings */
kvm_riscv_stage2_flush_cache(vcpu);
}
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
@ -197,6 +231,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
struct kvm_cpu_trap trap;
struct kvm_run *run = vcpu->run;
/* Mark this VCPU ran at least once */
vcpu->arch.ran_atleast_once = true;
vcpu->arch.srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
/* Process MMIO value returned from user-space */
@ -270,7 +307,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
* get an interrupt between __kvm_riscv_switch_to() and
* local_irq_enable() which can potentially change CSRs.
*/
trap.sepc = 0;
trap.sepc = vcpu->arch.guest_context.sepc;
trap.scause = csr_read(CSR_SCAUSE);
trap.stval = csr_read(CSR_STVAL);
trap.htval = csr_read(CSR_HTVAL);