From: Fuad Tabba <tabba@google.com>
To: kvmarm@lists.linux.dev
Cc: maz@kernel.org, will@kernel.org, qperret@google.com,
tabba@google.com, seanjc@google.com, alexandru.elisei@arm.com,
catalin.marinas@arm.com, philmd@linaro.org, james.morse@arm.com,
suzuki.poulose@arm.com, oliver.upton@linux.dev,
mark.rutland@arm.com, broonie@kernel.org, joey.gouly@arm.com,
rananta@google.com
Subject: [PATCH v1 16/44] KVM: arm64: Do not map the host fpsimd state to hyp in pKVM
Date: Wed, 27 Mar 2024 17:35:03 +0000 [thread overview]
Message-ID: <20240327173531.1379685-17-tabba@google.com> (raw)
In-Reply-To: <20240327173531.1379685-1-tabba@google.com>
pKVM maintains its own state for tracking the host fpsimd state.
Therefore, no need to map and share the host's view with it.
Signed-off-by: Fuad Tabba <tabba@google.com>
---
arch/arm64/include/asm/kvm_host.h | 2 --
arch/arm64/kvm/fpsimd.c | 31 ++++---------------------------
arch/arm64/kvm/reset.c | 1 -
3 files changed, 4 insertions(+), 30 deletions(-)
diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 3d12fc2aeb9e..cdbbfa3246c1 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -642,7 +642,6 @@ struct kvm_vcpu_arch {
struct kvm_guest_debug_arch external_debug_state;
struct user_fpsimd_state *host_fpsimd_state; /* hyp VA */
- struct task_struct *parent_task;
struct {
/* {Break,watch}point registers */
@@ -1214,7 +1213,6 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_ctxflush_fp(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu);
void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu);
-void kvm_vcpu_unshare_task_fp(struct kvm_vcpu *vcpu);
static inline bool kvm_pmu_counter_deferred(struct perf_event_attr *attr)
{
diff --git a/arch/arm64/kvm/fpsimd.c b/arch/arm64/kvm/fpsimd.c
index f297e89e4810..e3d9ec4ab9d0 100644
--- a/arch/arm64/kvm/fpsimd.c
+++ b/arch/arm64/kvm/fpsimd.c
@@ -14,19 +14,6 @@
#include <asm/kvm_mmu.h>
#include <asm/sysreg.h>
-void kvm_vcpu_unshare_task_fp(struct kvm_vcpu *vcpu)
-{
- struct task_struct *p = vcpu->arch.parent_task;
- struct user_fpsimd_state *fpsimd;
-
- if (!is_protected_kvm_enabled() || !p)
- return;
-
- fpsimd = &p->thread.uw.fpsimd_state;
- kvm_unshare_hyp(fpsimd, fpsimd + 1);
- put_task_struct(p);
-}
-
/*
* Called on entry to KVM_RUN unless this vcpu previously ran at least
* once and the most recent prior KVM_RUN for this vcpu was called from
@@ -38,11 +25,12 @@ void kvm_vcpu_unshare_task_fp(struct kvm_vcpu *vcpu)
*/
int kvm_arch_vcpu_run_map_fp(struct kvm_vcpu *vcpu)
{
- int ret;
-
struct user_fpsimd_state *fpsimd = ¤t->thread.uw.fpsimd_state;
+ int ret;
- kvm_vcpu_unshare_task_fp(vcpu);
+ /* pKVM has its own tracking of the host fpsimd state. */
+ if (is_protected_kvm_enabled())
+ return 0;
/* Make sure the host task fpsimd state is visible to hyp: */
ret = kvm_share_hyp(fpsimd, fpsimd + 1);
@@ -51,17 +39,6 @@ int kvm_arch_vcpu_run_map_fp(struct kvm_vcpu *vcpu)
vcpu->arch.host_fpsimd_state = kern_hyp_va(fpsimd);
- /*
- * We need to keep current's task_struct pinned until its data has been
- * unshared with the hypervisor to make sure it is not re-used by the
- * kernel and donated to someone else while already shared -- see
- * kvm_vcpu_unshare_task_fp() for the matching put_task_struct().
- */
- if (is_protected_kvm_enabled()) {
- get_task_struct(current);
- vcpu->arch.parent_task = current;
- }
-
return 0;
}
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 29ae68f60bef..3d8064bf67c8 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -139,7 +139,6 @@ void kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu)
{
void *sve_state = vcpu->arch.sve_state;
- kvm_vcpu_unshare_task_fp(vcpu);
kvm_unshare_hyp(vcpu, vcpu + 1);
if (sve_state)
kvm_unshare_hyp(sve_state, sve_state + vcpu_sve_state_size(vcpu));
--
2.44.0.478.gd926399ef9-goog
next prev parent reply other threads:[~2024-03-27 17:36 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-27 17:34 [PATCH v1 00/44] KVM: arm64: Preamble for pKVM Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 01/44] KVM: arm64: Change kvm_handle_mmio_return() return polarity Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 02/44] KVM: arm64: Use enum instead of helper for checking FP-state Fuad Tabba
2024-03-28 16:19 ` Mark Brown
2024-04-08 7:39 ` Marc Zyngier
2024-04-08 13:39 ` Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 03/44] KVM: arm64: Move setting the page as dirty out of the critical section Fuad Tabba
2024-04-08 7:41 ` Marc Zyngier
2024-04-08 15:41 ` Fuad Tabba
2024-04-08 15:53 ` Marc Zyngier
2024-04-08 15:57 ` Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 04/44] KVM: arm64: Avoid BUG-ing from the host abort path Fuad Tabba
2024-04-08 7:44 ` Marc Zyngier
2024-04-08 13:48 ` Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 05/44] KVM: arm64: Check for PTE validity when checking for executable/cacheable Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 06/44] KVM: arm64: Avoid BBM when changing only s/w bits in Stage-2 PTE Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 07/44] KVM: arm64: Support TLB invalidation in guest context Fuad Tabba
2024-04-15 11:36 ` Marc Zyngier
2024-04-15 15:02 ` Fuad Tabba
2024-04-15 15:59 ` Marc Zyngier
2024-03-27 17:34 ` [PATCH v1 08/44] KVM: arm64: Simplify vgic-v3 hypercalls Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 09/44] KVM: arm64: Add is_pkvm_initialized() helper Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 10/44] KVM: arm64: Introduce predicates to check for protected state Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 11/44] KVM: arm64: Split up nvhe/fixed_config.h Fuad Tabba
2024-03-27 17:34 ` [PATCH v1 12/44] KVM: arm64: Move pstate reset value definitions to kvm_arm.h Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 13/44] KVM: arm64: Clarify rationale for ZCR_EL1 value restored on guest exit Fuad Tabba
2024-03-28 18:53 ` Mark Brown
2024-04-08 13:34 ` Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 14/44] KVM: arm64: Refactor calculating SVE state size to use helpers Fuad Tabba
2024-03-28 18:57 ` Mark Brown
2024-04-08 13:35 ` Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 15/44] KVM: arm64: Use active guest SVE vector length on guest restore Fuad Tabba
2024-03-28 19:17 ` Mark Brown
2024-04-09 9:34 ` Fuad Tabba
2024-03-27 17:35 ` Fuad Tabba [this message]
2024-03-28 19:20 ` [PATCH v1 16/44] KVM: arm64: Do not map the host fpsimd state to hyp in pKVM Mark Brown
2024-03-27 17:35 ` [PATCH v1 17/44] KVM: arm64: Move some kvm_psci functions to a shared header Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 18/44] KVM: arm64: Refactor reset_mpidr() to extract its computation Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 19/44] KVM: arm64: Refactor kvm_vcpu_enable_ptrauth() for hyp use Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 20/44] KVM: arm64: Refactor enter_exception64() Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 21/44] KVM: arm64: Add PC_UPDATE_REQ flags covering all PC updates Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 22/44] KVM: arm64: Add vcpu flag copy primitive Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 23/44] KVM: arm64: Introduce gfn_to_memslot_prot() Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 24/44] KVM: arm64: Do not use the hva in kvm_handle_guest_abort() Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 25/44] KVM: arm64: Introduce hyp_rwlock_t Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 26/44] KVM: arm64: Add atomics-based checking refcount implementation at EL2 Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 27/44] KVM: arm64: Use atomic refcount helpers for 'struct hyp_page::refcount' Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 28/44] KVM: arm64: Remove locking from EL2 allocation fast-paths Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 29/44] KVM: arm64: Reformat/beautify PTP hypercall documentation Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 30/44] KVM: arm64: Rename firmware pseudo-register documentation file Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 31/44] KVM: arm64: Document the KVM/arm64-specific calls in hypercalls.rst Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 32/44] KVM: arm64: Prevent kmemleak from accessing .hyp.data Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 33/44] KVM: arm64: Issue CMOs when tearing down guest s2 pages Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 34/44] KVM: arm64: Do not set the virtual timer offset for protected vCPUs Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 35/44] KVM: arm64: Fix comment for __pkvm_vcpu_init_traps() Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 36/44] KVM: arm64: Do not re-initialize the KVM lock Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 37/44] KVM: arm64: Check directly whether a vcpu is protected Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 38/44] KVM: arm64: Trap debug break and watch from guest Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 39/44] KVM: arm64: Restrict protected VM capabilities Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 40/44] KVM: arm64: Do not support MTE for protected VMs Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 41/44] KVM: arm64: Move pkvm_vcpu_init_traps() to hyp vcpu init Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 42/44] KVM: arm64: Fix initializing traps in protected mode Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 43/44] KVM: arm64: Advertise GICv3 sysreg interface to protected guests Fuad Tabba
2024-03-27 17:35 ` [PATCH v1 44/44] KVM: arm64: Force injection of a data abort on NISV MMIO exit Fuad Tabba
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