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KVM: arm64: nv: Add basic emulation of AT S1E1{R,W}P

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Building on top of our primitive AT S1E{0,1}{R,W} emulation,
add minimal support for the FEAT_PAN2 instructions, momentary
context-switching PSTATE.PAN so that it takes effect in the
context of the guest.

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier
2024-07-14 10:40:43 +01:00
parent 477e89cabb
commit be0135bde1
1 changed files with 26 additions and 0 deletions
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26
arch/arm64/kvm/at.c
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@@ -49,6 +49,28 @@ static void __mmu_config_restore(struct mmu_config *config)
write_sysreg(config->vtcr, vtcr_el2);
}
static bool at_s1e1p_fast(struct kvm_vcpu *vcpu, u32 op, u64 vaddr)
{
u64 host_pan;
bool fail;
host_pan = read_sysreg_s(SYS_PSTATE_PAN);
write_sysreg_s(*vcpu_cpsr(vcpu) & PSTATE_PAN, SYS_PSTATE_PAN);
switch (op) {
case OP_AT_S1E1RP:
fail = __kvm_at(OP_AT_S1E1RP, vaddr);
break;
case OP_AT_S1E1WP:
fail = __kvm_at(OP_AT_S1E1WP, vaddr);
break;
}
write_sysreg_s(host_pan, SYS_PSTATE_PAN);
return fail;
}
/*
* Return the PAR_EL1 value as the result of a valid translation.
*
@@ -105,6 +127,10 @@ skip_mmu_switch:
isb();
switch (op) {
case OP_AT_S1E1RP:
case OP_AT_S1E1WP:
fail = at_s1e1p_fast(vcpu, op, vaddr);
break;
case OP_AT_S1E1R:
fail = __kvm_at(OP_AT_S1E1R, vaddr);
break;