shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-10 04:48:04 +09:00
Code Issues Packages Projects Releases Wiki Activity

UPSTREAM: KVM: arm64: Trap host SMCs in protected mode

Browse Source 
While protected KVM is installed, start trapping all host SMCs.
For now these are simply forwarded to EL3, except PSCI
CPU_ON/CPU_SUSPEND/SYSTEM_SUSPEND which are intercepted and the
hypervisor installed on newly booted cores.

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>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201202184122.26046-26-dbrazdil@google.com
(cherry picked from commit b93c17c418)
Signed-off-by: Will Deacon <willdeacon@google.com>
Change-Id: I4ca55f5d2bfaa0259b03f0193ffb8860f0b3c7ca
Bug: 178098380
Test: atest VirtualizationHostTestCases on an EL2-enabled device
This commit is contained in:
David Brazdil
2020-12-02 18:41:21 +00:00
committed by Will Deacon
parent 839af7af54
commit f22e34cc20
3 changed files with 15 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm64/include/asm/kvm_arm.h
View File

@@ -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 */

10
arch/arm64/kvm/hyp/nvhe/hyp-init.S
View File

@@ -88,6 +88,11 @@ SYM_CODE_END(__kvm_hyp_init)
* x0: struct kvm_nvhe_init_params PA
*/
SYM_CODE_START_LOCAL(___kvm_hyp_init)
alternative_if ARM64_KVM_PROTECTED_MODE
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
@@ -230,6 +235,11 @@ reset:
msr sctlr_el2, x5
isb
alternative_if ARM64_KVM_PROTECTED_MODE
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

5
arch/arm64/kvm/hyp/nvhe/switch.c
View File

@@ -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);
}