bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-18 06:44:00 -04:00
Code Issues Packages Projects Releases Wiki Activity

KVM: arm64: Add hvc handler at EL2 for hypercalls from protected VMs

Browse Source 
Add a hypercall handler at EL2 for hypercalls originating from protected
VMs. For now, this implements only the FEATURES and MEMINFO calls, but
subsequent patches will implement the SHARE and UNSHARE functions
necessary for virtio.

Unhandled hypercalls (including PSCI) are passed back to the host.

Reviewed-by: Vincent Donnefort <vdonnefort@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Tested-by: Mostafa Saleh <smostafa@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
Link: https://patch.msgid.link/20260330144841.26181-29-will@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Will Deacon
2026-03-30 15:48:29 +01:00
committed by Marc Zyngier
parent 5991916392
commit 94c5250515
3 changed files with 39 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm64/kvm/hyp/include/nvhe/pkvm.h
View File

@@ -88,6 +88,7 @@ struct pkvm_hyp_vm *get_pkvm_hyp_vm(pkvm_handle_t handle);
struct pkvm_hyp_vm *get_np_pkvm_hyp_vm(pkvm_handle_t handle);
void put_pkvm_hyp_vm(struct pkvm_hyp_vm *hyp_vm);
bool kvm_handle_pvm_hvc64(struct kvm_vcpu *vcpu, u64 *exit_code);
bool kvm_handle_pvm_sysreg(struct kvm_vcpu *vcpu, u64 *exit_code);
bool kvm_handle_pvm_restricted(struct kvm_vcpu *vcpu, u64 *exit_code);
void kvm_init_pvm_id_regs(struct kvm_vcpu *vcpu);

37
arch/arm64/kvm/hyp/nvhe/pkvm.c
View File

@@ -4,6 +4,8 @@
* Author: Fuad Tabba <tabba@google.com>
*/
#include <kvm/arm_hypercalls.h>
#include <linux/kvm_host.h>
#include <linux/mm.h>
@@ -971,3 +973,38 @@ err_unlock:
hyp_spin_unlock(&vm_table_lock);
return err;
}
/*
* Handler for protected VM HVC calls.
*
* Returns true if the hypervisor has handled the exit (and control
* should return to the guest) or false if it hasn't (and the handling
* should be performed by the host).
*/
bool kvm_handle_pvm_hvc64(struct kvm_vcpu *vcpu, u64 *exit_code)
{
u64 val[4] = { SMCCC_RET_INVALID_PARAMETER };
bool handled = true;
switch (smccc_get_function(vcpu)) {
case ARM_SMCCC_VENDOR_HYP_KVM_FEATURES_FUNC_ID:
val[0] = BIT(ARM_SMCCC_KVM_FUNC_FEATURES);
val[0] |= BIT(ARM_SMCCC_KVM_FUNC_HYP_MEMINFO);
break;
case ARM_SMCCC_VENDOR_HYP_KVM_HYP_MEMINFO_FUNC_ID:
if (smccc_get_arg1(vcpu) ||
smccc_get_arg2(vcpu) ||
smccc_get_arg3(vcpu)) {
break;
}
val[0] = PAGE_SIZE;
break;
default:
/* Punt everything else back to the host, for now. */
handled = false;
}
if (handled)
smccc_set_retval(vcpu, val[0], val[1], val[2], val[3]);
return handled;
}

1
arch/arm64/kvm/hyp/nvhe/switch.c
View File

@@ -190,6 +190,7 @@ static const exit_handler_fn hyp_exit_handlers[] = {
static const exit_handler_fn pvm_exit_handlers[] = {
[0 ... ESR_ELx_EC_MAX] = NULL,
[ESR_ELx_EC_HVC64] = kvm_handle_pvm_hvc64,
[ESR_ELx_EC_SYS64] = kvm_handle_pvm_sys64,
[ESR_ELx_EC_SVE] = kvm_handle_pvm_restricted,
[ESR_ELx_EC_FP_ASIMD] = kvm_hyp_handle_fpsimd,