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RISC-V: KVM: Forward SEED CSR access to user space

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The SEED CSR access from VS/VU mode (guest) will always trap to
HS-mode (KVM) when Zkr extension is available to the Guest/VM.

Forward this CSR access to KVM user space so that it can be
emulated based on the method chosen by VMM.

Fixes: f370b4e668 ("RISC-V: KVM: Allow scalar crypto extensions for Guest/VM")
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel 2024-02-13 19:04:00 +05:30 committed by Anup Patel
parent d0b94bcbb0
commit d808f0b1be
1 changed files with 13 additions and 0 deletions
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13
arch/riscv/kvm/vcpu_insn.c
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@ -7,6 +7,8 @@
#include <linux/bitops.h>
#include <linux/kvm_host.h>
#include <asm/cpufeature.h>
#define INSN_OPCODE_MASK 0x007c
#define INSN_OPCODE_SHIFT 2
#define INSN_OPCODE_SYSTEM 28
@ -213,9 +215,20 @@ struct csr_func {
unsigned long wr_mask);
};
static int seed_csr_rmw(struct kvm_vcpu *vcpu, unsigned int csr_num,
unsigned long *val, unsigned long new_val,
unsigned long wr_mask)
{
if (!riscv_isa_extension_available(vcpu->arch.isa, ZKR))
return KVM_INSN_ILLEGAL_TRAP;
return KVM_INSN_EXIT_TO_USER_SPACE;
}
static const struct csr_func csr_funcs[] = {
KVM_RISCV_VCPU_AIA_CSR_FUNCS
KVM_RISCV_VCPU_HPMCOUNTER_CSR_FUNCS
{ .base = CSR_SEED, .count = 1, .func = seed_csr_rmw },
};
/**