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File _service:tar_scm:target-arm-kvm-Write-CPU-state-back-to-KVM-on-reset.patch of Package qemu
From a079801cd3ae6484cad6826f20bcf4ecc7e97ead Mon Sep 17 00:00:00 2001 From: Jean-Philippe Brucker <jean-philippe@linaro.org> Date: Wed, 5 May 2021 15:43:27 +0200 Subject: [PATCH] target/arm/kvm: Write CPU state back to KVM on reset When a KVM vCPU is reset following a PSCI CPU_ON call, its power state is not synchronized with KVM at the moment. Because the vCPU is not marked dirty, we miss the call to kvm_arch_put_registers() that writes to KVM's MP_STATE. Force mp_state synchronization. Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Signed-off-by: Salil Mehta <salil.mehta@huawei.com> --- target/arm/kvm.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/target/arm/kvm.c b/target/arm/kvm.c index 70cf15b550..aca652621f 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -636,11 +636,12 @@ void kvm_arm_cpu_post_load(ARMCPU *cpu) void kvm_arm_reset_vcpu(ARMCPU *cpu) { int ret; + CPUState *cs = CPU(cpu); /* Re-init VCPU so that all registers are set to * their respective reset values. */ - ret = kvm_arm_vcpu_init(CPU(cpu)); + ret = kvm_arm_vcpu_init(cs); if (ret < 0) { fprintf(stderr, "kvm_arm_vcpu_init failed: %s\n", strerror(-ret)); abort(); @@ -657,6 +658,12 @@ void kvm_arm_reset_vcpu(ARMCPU *cpu) * for the same reason we do so in kvm_arch_get_registers(). */ write_list_to_cpustate(cpu); + + /* + * Ensure we call kvm_arch_put_registers(). The vCPU isn't marked dirty if + * it was parked in KVM and is now booting from a PSCI CPU_ON call. + */ + cs->vcpu_dirty = true; } void kvm_arm_create_host_vcpu(ARMCPU *cpu) -- 2.27.0
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