From: Oliver Upton <oliver.upton@linux.dev> mainline inclusion from mainline-v6.15-rc1 commit d0d81e03e6292b411452501ef0b3583b5ea884f7 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IBN3WI Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h... ---------------------------------------------------------------------- Userspace will soon be able to change the value of MIDR_EL1. Prepare by loading VPIDR_EL2 with the guest value for non-nested VMs. Since VPIDR_EL2 is set for any VM, get rid of the NV-specific cleanup of reloading the hardware value on vcpu_put(). And for nVHE, load the hardware value before switching to the host. Link: https://lore.kernel.org/r/20250225005401.679536-4-oliver.upton@linux.dev Signed-off-by: Oliver Upton <oliver.upton@linux.dev> --- arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 9 ++++++++- arch/arm64/kvm/hyp/nvhe/sysreg-sr.c | 4 +++- arch/arm64/kvm/hyp/vhe/sysreg-sr.c | 2 +- 3 files changed, 12 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h index 595ebff1de9f..0344913374f7 100644 --- a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h +++ b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h @@ -17,6 +17,11 @@ #include <asm/kvm_mmu.h> #include <asm/mpam.h> +static inline u64 ctxt_midr_el1(struct kvm_cpu_context *ctxt) +{ + return read_cpuid_id(); +} + static inline void __sysreg_save_common_state(struct kvm_cpu_context *ctxt) { ctxt_sys_reg(ctxt, MDSCR_EL1) = read_sysreg(mdscr_el1); @@ -104,8 +109,10 @@ static inline void __sysreg_restore_user_state(struct kvm_cpu_context *ctxt) write_sysreg(ctxt_sys_reg(ctxt, TPIDRRO_EL0), tpidrro_el0); } -static inline void __sysreg_restore_el1_state(struct kvm_cpu_context *ctxt) +static inline void __sysreg_restore_el1_state(struct kvm_cpu_context *ctxt, + u64 midr) { + write_sysreg(midr, vpidr_el2); write_sysreg(ctxt_sys_reg(ctxt, MPIDR_EL1), vmpidr_el2); if (has_vhe() || diff --git a/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c b/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c index 29305022bc04..b022af32ab2c 100644 --- a/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c +++ b/arch/arm64/kvm/hyp/nvhe/sysreg-sr.c @@ -28,7 +28,9 @@ void __sysreg_save_state_nvhe(struct kvm_cpu_context *ctxt) void __sysreg_restore_state_nvhe(struct kvm_cpu_context *ctxt) { - __sysreg_restore_el1_state(ctxt); + u64 midr = ctxt_midr_el1(ctxt); + + __sysreg_restore_el1_state(ctxt, midr); __sysreg_restore_common_state(ctxt); __sysreg_restore_user_state(ctxt); __sysreg_restore_el2_return_state(ctxt); diff --git a/arch/arm64/kvm/hyp/vhe/sysreg-sr.c b/arch/arm64/kvm/hyp/vhe/sysreg-sr.c index 283e19127591..6af9196784a1 100644 --- a/arch/arm64/kvm/hyp/vhe/sysreg-sr.c +++ b/arch/arm64/kvm/hyp/vhe/sysreg-sr.c @@ -89,7 +89,7 @@ void kvm_vcpu_load_sysregs_vhe(struct kvm_vcpu *vcpu) */ __sysreg32_restore_state(vcpu); __sysreg_restore_user_state(guest_ctxt); - __sysreg_restore_el1_state(guest_ctxt); + __sysreg_restore_el1_state(guest_ctxt, ctxt_midr_el1(guest_ctxt)); __mpam_guest_load(); #ifdef CONFIG_ARM64_HDBSS -- 2.33.0