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| author | Marc Zyngier <marc.zyngier@arm.com> | 2013-02-07 10:52:10 +0000 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2013-06-12 16:42:17 +0100 |
| commit | b4afad06c19e3489767532f86ff453a1d1e28b8c (patch) | |
| tree | 2c504047919ed9f37d52f154118a7f733bf8d722 /arch/arm64 | |
| parent | 06c7654d2fb8bac7b1af4340ad59434a5d89b86a (diff) | |
| download | linux-b4afad06c19e3489767532f86ff453a1d1e28b8c.tar.gz linux-b4afad06c19e3489767532f86ff453a1d1e28b8c.tar.xz | |
arm64: KVM: 32bit specific register world switch
Allow registers specific to 32bit guests to be saved/restored
during the world switch.
Reviewed-by: Christopher Covington <cov@codeaurora.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/kvm/hyp.S | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp.S b/arch/arm64/kvm/hyp.S index 8b510835b440..ff985e3d8b72 100644 --- a/arch/arm64/kvm/hyp.S +++ b/arch/arm64/kvm/hyp.S @@ -266,6 +266,74 @@ __kvm_hyp_code_start: msr cntkctl_el1, x23 .endm +.macro skip_32bit_state tmp, target + // Skip 32bit state if not needed + mrs \tmp, hcr_el2 + tbnz \tmp, #HCR_RW_SHIFT, \target +.endm + +.macro skip_tee_state tmp, target + // Skip ThumbEE state if not needed + mrs \tmp, id_pfr0_el1 + tbz \tmp, #12, \target +.endm + +.macro save_guest_32bit_state + skip_32bit_state x3, 1f + + add x3, x2, #CPU_SPSR_OFFSET(KVM_SPSR_ABT) + mrs x4, spsr_abt + mrs x5, spsr_und + mrs x6, spsr_irq + mrs x7, spsr_fiq + stp x4, x5, [x3] + stp x6, x7, [x3, #16] + + add x3, x2, #CPU_SYSREG_OFFSET(DACR32_EL2) + mrs x4, dacr32_el2 + mrs x5, ifsr32_el2 + mrs x6, fpexc32_el2 + mrs x7, dbgvcr32_el2 + stp x4, x5, [x3] + stp x6, x7, [x3, #16] + + skip_tee_state x8, 1f + + add x3, x2, #CPU_SYSREG_OFFSET(TEECR32_EL1) + mrs x4, teecr32_el1 + mrs x5, teehbr32_el1 + stp x4, x5, [x3] +1: +.endm + +.macro restore_guest_32bit_state + skip_32bit_state x3, 1f + + add x3, x2, #CPU_SPSR_OFFSET(KVM_SPSR_ABT) + ldp x4, x5, [x3] + ldp x6, x7, [x3, #16] + msr spsr_abt, x4 + msr spsr_und, x5 + msr spsr_irq, x6 + msr spsr_fiq, x7 + + add x3, x2, #CPU_SYSREG_OFFSET(DACR32_EL2) + ldp x4, x5, [x3] + ldp x6, x7, [x3, #16] + msr dacr32_el2, x4 + msr ifsr32_el2, x5 + msr fpexc32_el2, x6 + msr dbgvcr32_el2, x7 + + skip_tee_state x8, 1f + + add x3, x2, #CPU_SYSREG_OFFSET(TEECR32_EL1) + ldp x4, x5, [x3] + msr teecr32_el1, x4 + msr teehbr32_el1, x5 +1: +.endm + .macro activate_traps ldr x2, [x0, #VCPU_IRQ_LINES] ldr x1, [x0, #VCPU_HCR_EL2] @@ -494,6 +562,7 @@ ENTRY(__kvm_vcpu_run) bl __restore_sysregs bl __restore_fpsimd + restore_guest_32bit_state restore_guest_regs // That's it, no more messing around. @@ -509,6 +578,7 @@ __kvm_vcpu_return: save_guest_regs bl __save_fpsimd bl __save_sysregs + save_guest_32bit_state save_timer_state save_vgic_state |