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ANDROID: KVM: arm64: pkvm: Make {flush,sync}_shadow_state() take the full state

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As we're about to need to copy some state back and forth for
non0-protected guests, pass the full loaded state to the flush/sync
functions.

No functionnal change.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Bug: 209580772
Change-Id: I7ad6a00a7500e91237fcc0981261c819b2224ee0
Signed-off-by: Will Deacon <willdeacon@google.com>
This commit is contained in:
Marc Zyngier
2022-01-05 17:57:31 +00:00
committed by Will Deacon
parent 4262892c41
commit a1ab3b544a
1 changed files with 20 additions and 8 deletions
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28
arch/arm64/kvm/hyp/nvhe/hyp-main.c
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@@ -408,8 +408,13 @@ static void sync_vgic_state(struct kvm_vcpu *host_vcpu,
host_cpu_if->vgic_lr[i] = shadow_cpu_if->vgic_lr[i];
}
static void flush_timer_state(struct kvm_vcpu *shadow_vcpu)
static void flush_timer_state(struct pkvm_loaded_state *state)
{
struct kvm_vcpu *shadow_vcpu = state->vcpu;
if (!state->is_protected)
return;
/*
* A shadow vcpu has no offset, and sees vtime == ptime. The
* ptimer is fully emulated by EL1 and cannot be trusted.
@@ -420,8 +425,13 @@ static void flush_timer_state(struct kvm_vcpu *shadow_vcpu)
write_sysreg_el0(__vcpu_sys_reg(shadow_vcpu, CNTV_CTL_EL0), SYS_CNTV_CTL);
}
static void sync_timer_state(struct kvm_vcpu *shadow_vcpu)
static void sync_timer_state(struct pkvm_loaded_state *state)
{
struct kvm_vcpu *shadow_vcpu = state->vcpu;
if (!state->is_protected)
return;
/*
* Preserve the vtimer state so that it is always correct,
* even if the host tries to make a mess.
@@ -430,8 +440,9 @@ static void sync_timer_state(struct kvm_vcpu *shadow_vcpu)
__vcpu_sys_reg(shadow_vcpu, CNTV_CTL_EL0) = read_sysreg_el0(SYS_CNTV_CTL);
}
static void flush_shadow_state(struct kvm_vcpu *shadow_vcpu)
static void flush_shadow_state(struct pkvm_loaded_state *state)
{
struct kvm_vcpu *shadow_vcpu = state->vcpu;
struct kvm_vcpu *host_vcpu = shadow_vcpu->arch.pkvm.host_vcpu;
u8 esr_ec;
shadow_entry_exit_handler_fn ec_handler;
@@ -440,7 +451,7 @@ static void flush_shadow_state(struct kvm_vcpu *shadow_vcpu)
pkvm_reset_vcpu(shadow_vcpu);
flush_vgic_state(host_vcpu, shadow_vcpu);
flush_timer_state(shadow_vcpu);
flush_timer_state(state);
switch (ARM_EXCEPTION_CODE(shadow_vcpu->arch.pkvm.exit_code)) {
case ARM_EXCEPTION_IRQ:
@@ -462,14 +473,15 @@ static void flush_shadow_state(struct kvm_vcpu *shadow_vcpu)
shadow_vcpu->arch.pkvm.exit_code = 0;
}
static void sync_shadow_state(struct kvm_vcpu *shadow_vcpu, u32 exit_reason)
static void sync_shadow_state(struct pkvm_loaded_state *state, u32 exit_reason)
{
struct kvm_vcpu *shadow_vcpu = state->vcpu;
struct kvm_vcpu *host_vcpu = shadow_vcpu->arch.pkvm.host_vcpu;
u8 esr_ec;
shadow_entry_exit_handler_fn ec_handler;
sync_vgic_state(host_vcpu, shadow_vcpu);
sync_timer_state(shadow_vcpu);
sync_timer_state(state);
switch (ARM_EXCEPTION_CODE(exit_reason)) {
case ARM_EXCEPTION_IRQ:
@@ -579,11 +591,11 @@ static void handle___kvm_vcpu_run(struct kvm_cpu_context *host_ctxt)
if (unlikely(is_protected_kvm_enabled())) {
struct pkvm_loaded_state *state = this_cpu_ptr(&loaded_state);
flush_shadow_state(state->vcpu);
flush_shadow_state(state);
ret = __kvm_vcpu_run(state->vcpu);
sync_shadow_state(state->vcpu, ret);
sync_shadow_state(state, ret);
if (state->vcpu->arch.flags & KVM_ARM64_FP_ENABLED) {
/*