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RISC-V: KVM: Expose Zicbom to the guest

Browse source 
Guests may use the cbo.inval,clean,flush instructions when the
CPU has the Zicbom extension and the hypervisor sets henvcfg.CBIE
(for cbo.inval) and henvcfg.CBCFE (for cbo.clean,flush).

Add Zicbom support for KVM guests which may be enabled and
disabled from KVM userspace using the ISA extension ONE_REG API.

Also opportunistically switch the other isa extension checks in
kvm_riscv_vcpu_update_config() to riscv_isa_extension_available().

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Andrew Jones 2022-10-02 10:19:05 +05:30 committed by Anup Patel
parent afd5dde9a1
commit 56852c6211
2 changed files with 8 additions and 2 deletions
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1
arch/riscv/include/uapi/asm/kvm.h
View file

@ -101,6 +101,7 @@ enum KVM_RISCV_ISA_EXT_ID {
KVM_RISCV_ISA_EXT_SSTC,
KVM_RISCV_ISA_EXT_SVINVAL,
KVM_RISCV_ISA_EXT_ZIHINTPAUSE,
KVM_RISCV_ISA_EXT_ZICBOM,
KVM_RISCV_ISA_EXT_MAX,
};

9
arch/riscv/kvm/vcpu.c
View file

@ -59,6 +59,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
KVM_ISA_EXT_ARR(SVINVAL),
KVM_ISA_EXT_ARR(SVPBMT),
KVM_ISA_EXT_ARR(ZIHINTPAUSE),
KVM_ISA_EXT_ARR(ZICBOM),
};
static unsigned long kvm_riscv_vcpu_base2isa_ext(unsigned long base_ext)
@ -799,11 +800,15 @@ static void kvm_riscv_vcpu_update_config(const unsigned long *isa)
{
u64 henvcfg = 0;
if (__riscv_isa_extension_available(isa, RISCV_ISA_EXT_SVPBMT))
if (riscv_isa_extension_available(isa, SVPBMT))
henvcfg |= ENVCFG_PBMTE;
if (__riscv_isa_extension_available(isa, RISCV_ISA_EXT_SSTC))
if (riscv_isa_extension_available(isa, SSTC))
henvcfg |= ENVCFG_STCE;
if (riscv_isa_extension_available(isa, ZICBOM))
henvcfg |= (ENVCFG_CBIE | ENVCFG_CBCFE);
csr_write(CSR_HENVCFG, henvcfg);
#ifdef CONFIG_32BIT
csr_write(CSR_HENVCFGH, henvcfg >> 32);