DuDu371/linux-rockchip
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

RISC-V: KVM: Fix sbiret init before forwarding to userspace

Browse source 
[ Upstream commit 6b7b282e6baea06ba65b55ae7d38326ceb79cebf ]

When forwarding SBI calls to userspace ensure sbiret.error is
initialized to SBI_ERR_NOT_SUPPORTED first, in case userspace
neglects to set it to anything. If userspace neglects it then we
can't be sure it did anything else either, so we just report it
didn't do or try anything. Just init sbiret.value to zero, which is
the preferred value to return when nothing special is specified.

KVM was already initializing both sbiret.error and sbiret.value, but
the values used appear to come from a copy+paste of the __sbi_ecall()
implementation, i.e. a0 and a1, which don't apply prior to the call
being executed, nor at all when forwarding to userspace.

Fixes: dea8ee31a0 ("RISC-V: KVM: Add SBI v0.1 support")
Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20240807154943.150540-2-ajones@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrew Jones 2024-08-07 17:49:44 +02:00 • committed by Greg Kroah-Hartman
parent 161a8becd0
commit db2556e538
1 changed files with 2 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

4
arch/riscv/kvm/vcpu_sbi.c
View file

@ -67,8 +67,8 @@ void kvm_riscv_vcpu_sbi_forward(struct kvm_vcpu *vcpu, struct kvm_run *run)
run->riscv_sbi.args[3] = cp->a3;
run->riscv_sbi.args[4] = cp->a4;
run->riscv_sbi.args[5] = cp->a5;
run->riscv_sbi.ret[0] = cp->a0;
run->riscv_sbi.ret[1] = cp->a1;
run->riscv_sbi.ret[0] = SBI_ERR_NOT_SUPPORTED;
run->riscv_sbi.ret[1] = 0;
}
void kvm_riscv_vcpu_sbi_system_reset(struct kvm_vcpu *vcpu,