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RISC-V: KVM: Save mvendorid, marchid, and mimpid when creating VCPU

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We should save VCPU mvendorid, marchid, and mimpid at the time
of creating VCPU so that we don't have to do host SBI call every
time Guest/VM ask for these details.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel 2022-12-07 09:17:43 +05:30 committed by Anup Patel
parent a1a44e227c
commit 52ec4b695d
3 changed files with 16 additions and 6 deletions
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5
arch/riscv/include/asm/kvm_host.h
View file

@ -165,6 +165,11 @@ struct kvm_vcpu_arch {
/* ISA feature bits (similar to MISA) */
DECLARE_BITMAP(isa, RISCV_ISA_EXT_MAX);
/* Vendor, Arch, and Implementation details */
unsigned long mvendorid;
unsigned long marchid;
unsigned long mimpid;
/* SSCRATCH, STVEC, and SCOUNTEREN of Host */
unsigned long host_sscratch;
unsigned long host_stvec;

6
arch/riscv/kvm/vcpu.c
View file

@ -21,6 +21,7 @@
#include <asm/csr.h>
#include <asm/cacheflush.h>
#include <asm/hwcap.h>
#include <asm/sbi.h>
const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
KVM_GENERIC_VCPU_STATS(),
@ -171,6 +172,11 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
set_bit(host_isa, vcpu->arch.isa);
}
/* Setup vendor, arch, and implementation details */
vcpu->arch.mvendorid = sbi_get_mvendorid();
vcpu->arch.marchid = sbi_get_marchid();
vcpu->arch.mimpid = sbi_get_mimpid();
/* Setup VCPU hfence queue */
spin_lock_init(&vcpu->arch.hfence_lock);

11
arch/riscv/kvm/vcpu_sbi_base.c
View file

@ -19,7 +19,6 @@ static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
{
int ret = 0;
struct kvm_cpu_context *cp = &vcpu->arch.guest_context;
struct sbiret ecall_ret;
switch (cp->a6) {
case SBI_EXT_BASE_GET_SPEC_VERSION:
@ -48,13 +47,13 @@ static int kvm_sbi_ext_base_handler(struct kvm_vcpu *vcpu, struct kvm_run *run,
*out_val = kvm_vcpu_sbi_find_ext(cp->a0) ? 1 : 0;
break;
case SBI_EXT_BASE_GET_MVENDORID:
*out_val = vcpu->arch.mvendorid;
break;
case SBI_EXT_BASE_GET_MARCHID:
*out_val = vcpu->arch.marchid;
break;
case SBI_EXT_BASE_GET_MIMPID:
ecall_ret = sbi_ecall(SBI_EXT_BASE, cp->a6, 0, 0, 0, 0, 0, 0);
if (!ecall_ret.error)
*out_val = ecall_ret.value;
/*TODO: We are unnecessarily converting the error twice */
ret = sbi_err_map_linux_errno(ecall_ret.error);
*out_val = vcpu->arch.mimpid;
break;
default:
ret = -EOPNOTSUPP;