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KVM: arm64: nv: Add SVC trap forwarding

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HFGITR_EL2 allows the trap of SVC instructions to EL2. Allow these
traps to be forwarded. Take this opportunity to deny any 32bit activity
when NV is enabled.

Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Jing Zhang <jingzhangos@google.com>
Link: https://lore.kernel.org/r/20230815183903.2735724-24-maz@kernel.org
This commit is contained in:
Marc Zyngier 2023-08-15 19:38:57 +01:00
parent d0be0b2ede
commit a77b31dce4
2 changed files with 16 additions and 0 deletions
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4
arch/arm64/kvm/arm.c
View File

@ -36,6 +36,7 @@
#include <asm/kvm_arm.h>
#include <asm/kvm_asm.h>
#include <asm/kvm_mmu.h>
#include <asm/kvm_nested.h>
#include <asm/kvm_pkvm.h>
#include <asm/kvm_emulate.h>
#include <asm/sections.h>
@ -818,6 +819,9 @@ static bool vcpu_mode_is_bad_32bit(struct kvm_vcpu *vcpu)
if (likely(!vcpu_mode_is_32bit(vcpu)))
return false;
if (vcpu_has_nv(vcpu))
return true;
return !kvm_supports_32bit_el0();
}

12
arch/arm64/kvm/handle_exit.c
View File

@ -226,6 +226,17 @@ static int kvm_handle_eret(struct kvm_vcpu *vcpu)
return 1;
}
static int handle_svc(struct kvm_vcpu *vcpu)
{
/*
* So far, SVC traps only for NV via HFGITR_EL2. A SVC from a
* 32bit guest would be caught by vpcu_mode_is_bad_32bit(), so
* we should only have to deal with a 64 bit exception.
*/
kvm_inject_nested_sync(vcpu, kvm_vcpu_get_esr(vcpu));
return 1;
}
static exit_handle_fn arm_exit_handlers[] = {
[0 ... ESR_ELx_EC_MAX] = kvm_handle_unknown_ec,
[ESR_ELx_EC_WFx] = kvm_handle_wfx,
@ -239,6 +250,7 @@ static exit_handle_fn arm_exit_handlers[] = {
[ESR_ELx_EC_SMC32] = handle_smc,
[ESR_ELx_EC_HVC64] = handle_hvc,
[ESR_ELx_EC_SMC64] = handle_smc,
[ESR_ELx_EC_SVC64] = handle_svc,
[ESR_ELx_EC_SYS64] = kvm_handle_sys_reg,
[ESR_ELx_EC_SVE] = handle_sve,
[ESR_ELx_EC_ERET] = kvm_handle_eret,