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target/riscv: Improve delivery of guest external interrupts 

The guest external interrupts from an interrupt controller are
delivered only when the Guest/VM is running (i.e. V=1). This means
any guest external interrupt which is triggered while the Guest/VM
is not running (i.e. V=0) will be missed on QEMU resulting in Guest
with sluggish response to serial console input and other I/O events.

To solve this, we check and inject interrupt after setting V=1.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Frank Chang <frank.chang@sifive.com>
Message-id: 20220204174700.534953-5-anup@brainfault.org
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
This commit is contained in:
Anup Patel 2022-02-04 23:16:40 +05:30 committed by Alistair Francis
parent cd032fe75c
commit 02d9565b92
1 changed files with 13 additions and 0 deletions
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13
target/riscv/cpu_helper.c
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@ -326,6 +326,19 @@ void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable)
} }
env->virt = set_field(env->virt, VIRT_ONOFF, enable); env->virt = set_field(env->virt, VIRT_ONOFF, enable);
if (enable) {
/*
* The guest external interrupts from an interrupt controller are
* delivered only when the Guest/VM is running (i.e. V=1). This means
* any guest external interrupt which is triggered while the Guest/VM
* is not running (i.e. V=0) will be missed on QEMU resulting in guest
* with sluggish response to serial console input and other I/O events.
*
* To solve this, we check and inject interrupt after setting V=1.
*/
riscv_cpu_update_mip(env_archcpu(env), 0, 0);
}
} }
bool riscv_cpu_two_stage_lookup(int mmu_idx) bool riscv_cpu_two_stage_lookup(int mmu_idx)