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ANDROID: KVM: arm64: Refactor __sync_vcpu_state()

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Split it into two functions, sync/flush, which correspond to the
direction the data is going. Remove the need to explicitly pass
the host vcpu since the shadow already has a trusted pointer to
it.

Bug: 220830416
Signed-off-by: Fuad Tabba <tabba@google.com>
Change-Id: Ibb5a34d66254788782b219565833e061c664abb2
This commit is contained in:
Fuad Tabba
2022-02-24 14:41:13 +00:00
committed by Quentin Perret
parent 5acc639a71
commit 1698f20d7e
1 changed files with 18 additions and 4 deletions
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22
arch/arm64/kvm/hyp/nvhe/hyp-main.c
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@@ -485,7 +485,7 @@ static void sync_timer_state(struct pkvm_loaded_state *state)
__vcpu_sys_reg(shadow_vcpu, CNTV_CTL_EL0) = read_sysreg_el0(SYS_CNTV_CTL);
}
static void __sync_vcpu_state(struct kvm_vcpu *from_vcpu,
static void __copy_vcpu_state(const struct kvm_vcpu *from_vcpu,
struct kvm_vcpu *to_vcpu)
{
int i;
@@ -507,6 +507,20 @@ static void __sync_vcpu_state(struct kvm_vcpu *from_vcpu,
}
}
static void __sync_vcpu_state(struct kvm_vcpu *shadow_vcpu)
{
struct kvm_vcpu *host_vcpu = shadow_vcpu->arch.pkvm.host_vcpu;
__copy_vcpu_state(shadow_vcpu, host_vcpu);
}
static void __flush_vcpu_state(struct kvm_vcpu *shadow_vcpu)
{
struct kvm_vcpu *host_vcpu = shadow_vcpu->arch.pkvm.host_vcpu;
__copy_vcpu_state(host_vcpu, shadow_vcpu);
}
static void flush_shadow_state(struct pkvm_loaded_state *state)
{
struct kvm_vcpu *shadow_vcpu = state->vcpu;
@@ -524,7 +538,7 @@ static void flush_shadow_state(struct pkvm_loaded_state *state)
*/
if (!state->is_protected) {
if (READ_ONCE(host_vcpu->arch.flags) & KVM_ARM64_PKVM_STATE_DIRTY)
__sync_vcpu_state(host_vcpu, shadow_vcpu);
__flush_vcpu_state(shadow_vcpu);
state->vcpu->arch.hcr_el2 = HCR_GUEST_FLAGS & ~(HCR_RW | HCR_TWI | HCR_TWE);
state->vcpu->arch.hcr_el2 |= host_vcpu->arch.hcr_el2;
@@ -664,7 +678,7 @@ static void handle___pkvm_vcpu_put(struct kvm_cpu_context *host_ctxt)
if (!state->is_protected &&
!(READ_ONCE(vcpu->arch.flags) & KVM_ARM64_PKVM_STATE_DIRTY))
__sync_vcpu_state(state->vcpu, vcpu);
__sync_vcpu_state(state->vcpu);
put_shadow_vcpu(state->vcpu);
@@ -687,7 +701,7 @@ static void handle___pkvm_vcpu_sync_state(struct kvm_cpu_context *host_ctxt)
state->vcpu->arch.pkvm.host_vcpu != vcpu)
return;
__sync_vcpu_state(state->vcpu, vcpu);
__sync_vcpu_state(state->vcpu);
}
}