Our idmap is becoming too big, to the point where it doesn't fit in a 4kB page anymore. There are some low-hanging fruits though, such as the el2_init_state horror that is expanded 3 times in the kernel. Let's at least limit ourselves to two copies, which makes the kernel link again. At some point, we'll have to have a better way of doing this. Reported-by: Nathan Chancellor <nathan@xxxxxxxxxx> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Link: https://lore.kernel.org/r/20241009204903.GA3353168@thelio-3990X --- arch/arm64/include/asm/kvm_asm.h | 1 + arch/arm64/kernel/asm-offsets.c | 1 + arch/arm64/kvm/hyp/nvhe/hyp-init.S | 52 +++++++++++++++++------------- 3 files changed, 31 insertions(+), 23 deletions(-) diff --git a/arch/arm64/include/asm/kvm_asm.h b/arch/arm64/include/asm/kvm_asm.h index b36a3b6cc0116..67afac659231e 100644 --- a/arch/arm64/include/asm/kvm_asm.h +++ b/arch/arm64/include/asm/kvm_asm.h @@ -178,6 +178,7 @@ struct kvm_nvhe_init_params { unsigned long hcr_el2; unsigned long vttbr; unsigned long vtcr; + unsigned long tmp; }; /* diff --git a/arch/arm64/kernel/asm-offsets.c b/arch/arm64/kernel/asm-offsets.c index 27de1dddb0abe..b21dd24b8efc3 100644 --- a/arch/arm64/kernel/asm-offsets.c +++ b/arch/arm64/kernel/asm-offsets.c @@ -146,6 +146,7 @@ int main(void) DEFINE(NVHE_INIT_HCR_EL2, offsetof(struct kvm_nvhe_init_params, hcr_el2)); DEFINE(NVHE_INIT_VTTBR, offsetof(struct kvm_nvhe_init_params, vttbr)); DEFINE(NVHE_INIT_VTCR, offsetof(struct kvm_nvhe_init_params, vtcr)); + DEFINE(NVHE_INIT_TMP, offsetof(struct kvm_nvhe_init_params, tmp)); #endif #ifdef CONFIG_CPU_PM DEFINE(CPU_CTX_SP, offsetof(struct cpu_suspend_ctx, sp)); diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-init.S b/arch/arm64/kvm/hyp/nvhe/hyp-init.S index 401af1835be6b..fc18662260676 100644 --- a/arch/arm64/kvm/hyp/nvhe/hyp-init.S +++ b/arch/arm64/kvm/hyp/nvhe/hyp-init.S @@ -24,28 +24,25 @@ .align 11 SYM_CODE_START(__kvm_hyp_init) - ventry __invalid // Synchronous EL2t - ventry __invalid // IRQ EL2t - ventry __invalid // FIQ EL2t - ventry __invalid // Error EL2t + ventry . // Synchronous EL2t + ventry . // IRQ EL2t + ventry . // FIQ EL2t + ventry . // Error EL2t - ventry __invalid // Synchronous EL2h - ventry __invalid // IRQ EL2h - ventry __invalid // FIQ EL2h - ventry __invalid // Error EL2h + ventry . // Synchronous EL2h + ventry . // IRQ EL2h + ventry . // FIQ EL2h + ventry . // Error EL2h ventry __do_hyp_init // Synchronous 64-bit EL1 - ventry __invalid // IRQ 64-bit EL1 - ventry __invalid // FIQ 64-bit EL1 - ventry __invalid // Error 64-bit EL1 + ventry . // IRQ 64-bit EL1 + ventry . // FIQ 64-bit EL1 + ventry . // Error 64-bit EL1 - ventry __invalid // Synchronous 32-bit EL1 - ventry __invalid // IRQ 32-bit EL1 - ventry __invalid // FIQ 32-bit EL1 - ventry __invalid // Error 32-bit EL1 - -__invalid: - b . + ventry . // Synchronous 32-bit EL1 + ventry . // IRQ 32-bit EL1 + ventry . // FIQ 32-bit EL1 + ventry . // Error 32-bit EL1 /* * Only uses x0..x3 so as to not clobber callee-saved SMCCC registers. @@ -76,6 +73,13 @@ __do_hyp_init: eret SYM_CODE_END(__kvm_hyp_init) +SYM_CODE_START_LOCAL(__kvm_init_el2_state) + /* Initialize EL2 CPU state to sane values. */ + init_el2_state // Clobbers x0..x2 + finalise_el2_state + ret +SYM_CODE_END(__kvm_init_el2_state) + /* * Initialize the hypervisor in EL2. * @@ -102,9 +106,12 @@ SYM_CODE_START_LOCAL(___kvm_hyp_init) // TPIDR_EL2 is used to preserve x0 across the macro maze... isb msr tpidr_el2, x0 - init_el2_state - finalise_el2_state + str lr, [x0, #NVHE_INIT_TMP] + + bl __kvm_init_el2_state + mrs x0, tpidr_el2 + ldr lr, [x0, #NVHE_INIT_TMP] 1: ldr x1, [x0, #NVHE_INIT_TPIDR_EL2] @@ -199,9 +206,8 @@ SYM_CODE_START_LOCAL(__kvm_hyp_init_cpu) 2: msr SPsel, #1 // We want to use SP_EL{1,2} - /* Initialize EL2 CPU state to sane values. */ - init_el2_state // Clobbers x0..x2 - finalise_el2_state + bl __kvm_init_el2_state + __init_el2_nvhe_prepare_eret /* Enable MMU, set vectors and stack. */ -- 2.39.2 -- Without deviation from the norm, progress is not possible.
