在 2023年06月06日 14:30, Youling Tang 写道:
Hi, Tianrui
On 05/30/2023 09:51 AM, Tianrui Zhao wrote:
/* snip */
+struct kvm_vcpu_arch {
+ /*
+ * Switch pointer-to-function type to unsigned long
+ * for loading the value into register directly.
+ */
+ unsigned long guest_eentry;
+ unsigned long host_eentry;
+
+ /* Pointers stored here for easy accessing from assembly code */
+ int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
+
+ /* Host registers preserved across guest mode execution */
+ unsigned long host_stack;
+ unsigned long host_gp;
In arch/loongarch/kvm/switch.S,
ld.d tp, a2, KVM_ARCH_HGP
ld.d sp, a2, KVM_ARCH_HSTACK
Should we need to change host_gp to host_tp (and also change host_stack
to host_sp for consistency).
And modify KVM_ARCH_HSTACK and KVM_ARCH_HGP synchronously.
Thanks,
Youling
Why need we do this? and the kvm_arch_hstack/hgp is used to save and
restore host sp/tp when vcpu world switch.
Thanks
Tianrui Zhao
+ unsigned long host_pgd;
+
+ /* Host CSRs are used when handling exits from guest */
+ unsigned long badi;
+ unsigned long badv;
+ unsigned long host_ecfg;
+ unsigned long host_estat;
+ unsigned long host_percpu;
+
+ /* GPRs */
+ unsigned long gprs[32];
+ unsigned long pc;
+
+ /* FPU state */
+ struct loongarch_fpu fpu FPU_ALIGN;
+ /* Which auxiliary state is loaded (KVM_LOONGARCH_AUX_*) */
+ unsigned int aux_inuse;
+
+ /* CSR state */
+ struct loongarch_csrs *csr;
+
+ /* GPR used as IO source/target */
+ u32 io_gpr;
+
+ struct hrtimer swtimer;
+ /* KVM register to control count timer */
+ u32 count_ctl;
+
+ /* Bitmask of exceptions that are pending */
+ unsigned long irq_pending;
+ /* Bitmask of pending exceptions to be cleared */
+ unsigned long irq_clear;
+
+ /* Cache for pages needed inside spinlock regions */
+ struct kvm_mmu_memory_cache mmu_page_cache;
+
+ /* vcpu's vpid */
+ u64 vpid;
+
+ /* Period of stable timer tick in ns */
+ u64 timer_period_ns;
+ /* Frequency of stable timer in Hz */
+ u64 timer_mhz;
+ /* Stable bias from the raw time */
+ u64 timer_bias;
+ /* Dynamic nanosecond bias (multiple of timer_period_ns) to
avoid overflow */
+ s64 timer_dyn_bias;
+
+ ktime_t stable_ktime_saved;
+
+ u64 core_ext_ioisr[4];
+
+ /* Last CPU the vCPU state was loaded on */
+ int last_sched_cpu;
+ /* Last CPU the vCPU actually executed guest code on */
+ int last_exec_cpu;
+ /* mp state */
+ struct kvm_mp_state mp_state;
+};
