xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

KVM: arm/arm64: Prepare to handle deferred save/restore of SPSR_EL1

Browse Source 
SPSR_EL1 is not used by a VHE host kernel and can be deferred, but we
need to rework the accesses to this register to access the latest value
depending on whether or not guest system registers are loaded on the CPU
or only reside in memory.

The handling of accessing the various banked SPSRs for 32-bit VMs is a
bit clunky, but this will be improved in following patches which will
first prepare and subsequently implement deferred save/restore of the
32-bit registers, including the 32-bit SPSRs.

Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Christoffer Dall
2017-12-27 20:01:52 +01:00
committed by Marc Zyngier
parent d47533dab9
commit 00536ec476
5 changed files with 51 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/kvm/emulate.c
View File

@@ -142,7 +142,7 @@ unsigned long *vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num)
/*
* Return the SPSR for the current mode of the virtual CPU.
*/
unsigned long *vcpu_spsr(struct kvm_vcpu *vcpu)
unsigned long *__vcpu_spsr(struct kvm_vcpu *vcpu)
{
unsigned long mode = *vcpu_cpsr(vcpu) & MODE_MASK;
switch (mode) {