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FROMGIT: KVM: arm64: Save guest's ZCR_EL1 before saving the FPSIMD state

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Make sure the guest's ZCR_EL1 is saved before we save/flush the
state. This will be useful in later patches.

Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
(cherry picked from commit b145a8437a
 git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git next)
Signed-off-by: Will Deacon <willdeacon@google.com>
Bug: 178098380
Test: atest VirtualizationHostTestCases on an EL2-enabled device
Change-Id: I1e3ee364780d9f63436d246431cd82e651dc6571
This commit is contained in:
Marc Zyngier
2021-03-12 14:30:52 +00:00
committed by Quentin Perret
parent 4cb78b26ea
commit 507e10616c
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/kvm/fpsimd.c
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@@ -121,10 +121,10 @@ void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu)
local_irq_save(flags);
if (vcpu->arch.flags & KVM_ARM64_FP_ENABLED) {
fpsimd_save_and_flush_cpu_state();
if (guest_has_sve)
__vcpu_sys_reg(vcpu, ZCR_EL1) = read_sysreg_el1(SYS_ZCR);
fpsimd_save_and_flush_cpu_state();
} else if (host_has_sve) {
/*
* The FPSIMD/SVE state in the CPU has not been touched, and we