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target/riscv: Fix VS mode interrupts forwarding.

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Currently riscv_cpu_local_irq_pending is used to find out pending
interrupt and VS mode interrupts are being shifted to represent
S mode interrupts in this function. So when the cause returned by
this function is passed to riscv_cpu_do_interrupt to actually
forward the interrupt, the VS mode forwarding check does not work
as intended and interrupt is actually forwarded to hypervisor. This
patch fixes this issue.

Backports commit c5969a3a3c2cb9ea02ffb7e86acb059d3cf8c264 from qemu
This commit is contained in:
Rajnesh Kanwal 2020-04-30 06:20:48 -04:00 committed by Lioncash
parent 1001f0ba1f
commit cf08d74c26
1 changed files with 8 additions and 1 deletions
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9
qemu/target/riscv/cpu_helper.c
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@ -46,7 +46,7 @@ static int riscv_cpu_local_irq_pending(CPURISCVState *env)
target_ulong pending = env->mip & env->mie &
~(MIP_VSSIP | MIP_VSTIP | MIP_VSEIP);
target_ulong vspending = (env->mip & env->mie &
(MIP_VSSIP | MIP_VSTIP | MIP_VSEIP)) >> 1;
(MIP_VSSIP | MIP_VSTIP | MIP_VSEIP));
target_ulong mie = env->priv < PRV_M ||
(env->priv == PRV_M && mstatus_mie);
@ -900,6 +900,13 @@ void riscv_cpu_do_interrupt(CPUState *cs)
if (riscv_cpu_virt_enabled(env) && ((hdeleg >> cause) & 1) &&
!force_hs_execp) {
/*
* See if we need to adjust cause. Yes if its VS mode interrupt
* no if hypervisor has delegated one of hs mode's interrupt
*/
if (cause == IRQ_VS_TIMER || cause == IRQ_VS_SOFT ||
cause == IRQ_VS_EXT)
cause = cause - 1;
/* Trap to VS mode */
} else if (riscv_cpu_virt_enabled(env)) {
/* Trap into HS mode, from virt */