@@ -80,6 +80,7 @@
HCR_FMO | HCR_IMO | HCR_PTW )
#define HCR_VIRT_EXCP_MASK (HCR_VSE | HCR_VI | HCR_VF)
#define HCR_HOST_NVHE_FLAGS (HCR_RW | HCR_API | HCR_APK | HCR_ATA)
+#define HCR_HOST_NVHE_PROTECTED_FLAGS (HCR_HOST_NVHE_FLAGS | HCR_TSC)
#define HCR_HOST_VHE_FLAGS (HCR_RW | HCR_TGE | HCR_E2H)
/* TCR_EL2 Registers bits */
@@ -88,6 +88,11 @@ SYM_CODE_END(__kvm_hyp_init)
* x0: struct kvm_nvhe_init_params PA
*/
SYM_CODE_START(___kvm_hyp_init)
+alternative_if ARM64_PROTECTED_KVM
+ mov_q x1, HCR_HOST_NVHE_PROTECTED_FLAGS
+ msr hcr_el2, x1
+alternative_else_nop_endif
+
ldr x1, [x0, #NVHE_INIT_TPIDR_EL2]
msr tpidr_el2, x1
@@ -233,6 +238,11 @@ reset:
msr sctlr_el2, x5
isb
+alternative_if ARM64_PROTECTED_KVM
+ mov_q x5, HCR_HOST_NVHE_FLAGS
+ msr hcr_el2, x5
+alternative_else_nop_endif
+
/* Install stub vectors */
adr_l x5, __hyp_stub_vectors
msr vbar_el2, x5
@@ -97,7 +97,10 @@ static void __deactivate_traps(struct kvm_vcpu *vcpu)
mdcr_el2 |= MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT;
write_sysreg(mdcr_el2, mdcr_el2);
- write_sysreg(HCR_HOST_NVHE_FLAGS, hcr_el2);
+ if (is_protected_kvm_enabled())
+ write_sysreg(HCR_HOST_NVHE_PROTECTED_FLAGS, hcr_el2);
+ else
+ write_sysreg(HCR_HOST_NVHE_FLAGS, hcr_el2);
write_sysreg(CPTR_EL2_DEFAULT, cptr_el2);
write_sysreg(__kvm_hyp_host_vector, vbar_el2);
}
While protected nVHE KVM is installed, start trapping all host SMCs. By default, these are simply forwarded to EL3, but PSCI SMCs are validated first. Create new constant HCR_HOST_NVHE_PROTECTED_FLAGS with the new set of HCR flags to use while the nVHE vector is installed when the kernel was booted with the protected flag enabled. Switch back to the default HCR flags when switching back to the stub vector. Signed-off-by: David Brazdil <dbrazdil@google.com> --- arch/arm64/include/asm/kvm_arm.h | 1 + arch/arm64/kvm/hyp/nvhe/hyp-init.S | 10 ++++++++++ arch/arm64/kvm/hyp/nvhe/switch.c | 5 ++++- 3 files changed, 15 insertions(+), 1 deletion(-)