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authorLinus Torvalds <torvalds@linux-foundation.org>2020-01-30 07:34:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-01-30 07:34:33 -0800
commit11f2534bae8c9dc6dace2018226733e4899a57c3 (patch)
treef2afe4843c4d9d6fc8815dbc15cd7aabc88e36b0 /arch/arm64
parent39bed42de2e7d74686a2d5a45638d6a5d7e7d473 (diff)
parent4942dc6638b07b5326b6d2faa142635c559e7cd5 (diff)
downloadkernel-11f2534bae8c9dc6dace2018226733e4899a57c3.tar.gz
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 KVM fix from Catalin Marinas: "Set the correct MDCR_EL2 register value on the first run of a vCPU" * tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: KVM: arm64: Write arch.mdcr_el2 changes since last vcpu_load on VHE
Diffstat (limited to 'arch/arm64')
-rw-r--r--arch/arm64/kvm/debug.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c
index 43487f035385..7a7e425616b5 100644
--- a/arch/arm64/kvm/debug.c
+++ b/arch/arm64/kvm/debug.c
@@ -101,7 +101,7 @@ void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu)
void kvm_arm_setup_debug(struct kvm_vcpu *vcpu)
{
bool trap_debug = !(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY);
- unsigned long mdscr;
+ unsigned long mdscr, orig_mdcr_el2 = vcpu->arch.mdcr_el2;
trace_kvm_arm_setup_debug(vcpu, vcpu->guest_debug);
@@ -197,6 +197,10 @@ void kvm_arm_setup_debug(struct kvm_vcpu *vcpu)
if (vcpu_read_sys_reg(vcpu, MDSCR_EL1) & (DBG_MDSCR_KDE | DBG_MDSCR_MDE))
vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY;
+ /* Write mdcr_el2 changes since vcpu_load on VHE systems */
+ if (has_vhe() && orig_mdcr_el2 != vcpu->arch.mdcr_el2)
+ write_sysreg(vcpu->arch.mdcr_el2, mdcr_el2);
+
trace_kvm_arm_set_dreg32("MDCR_EL2", vcpu->arch.mdcr_el2);
trace_kvm_arm_set_dreg32("MDSCR_EL1", vcpu_read_sys_reg(vcpu, MDSCR_EL1));
}