From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Marc Zyngier <maz@kernel.org>, Fuad Tabba <tabba@google.com>,
Sasha Levin <sashal@kernel.org>,
catalin.marinas@arm.com, will@kernel.org, ardb@kernel.org,
pbonzini@redhat.com, dbrazdil@google.com, mark.rutland@arm.com,
qperret@google.com, steven.price@arm.com,
linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu
Subject: [PATCH AUTOSEL 5.15 05/24] KVM: arm64: Save PSTATE early on exit
Date: Mon, 6 Dec 2021 16:12:10 -0500 [thread overview]
Message-ID: <20211206211230.1660072-5-sashal@kernel.org> (raw)
In-Reply-To: <20211206211230.1660072-1-sashal@kernel.org>
From: Marc Zyngier <maz@kernel.org>
[ Upstream commit 83bb2c1a01d7127d5adc7d69d7aaa3f7072de2b4 ]
In order to be able to use primitives such as vcpu_mode_is_32bit(),
we need to synchronize the guest PSTATE. However, this is currently
done deep into the bowels of the world-switch code, and we do have
helpers evaluating this much earlier (__vgic_v3_perform_cpuif_access
and handle_aarch32_guest, for example).
Move the saving of the guest pstate into the early fixups, which
cures the first issue. The second one will be addressed separately.
Tested-by: Fuad Tabba <tabba@google.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arm64/kvm/hyp/include/hyp/switch.h | 6 ++++++
arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 7 ++++++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index a0e78a6027be0..c75e84489f57b 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -416,6 +416,12 @@ static inline bool __hyp_handle_ptrauth(struct kvm_vcpu *vcpu)
*/
static inline bool fixup_guest_exit(struct kvm_vcpu *vcpu, u64 *exit_code)
{
+ /*
+ * Save PSTATE early so that we can evaluate the vcpu mode
+ * early on.
+ */
+ vcpu->arch.ctxt.regs.pstate = read_sysreg_el2(SYS_SPSR);
+
if (ARM_EXCEPTION_CODE(*exit_code) != ARM_EXCEPTION_IRQ)
vcpu->arch.fault.esr_el2 = read_sysreg_el2(SYS_ESR);
diff --git a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
index de7e14c862e6c..7ecca8b078519 100644
--- a/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
+++ b/arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h
@@ -70,7 +70,12 @@ static inline void __sysreg_save_el1_state(struct kvm_cpu_context *ctxt)
static inline void __sysreg_save_el2_return_state(struct kvm_cpu_context *ctxt)
{
ctxt->regs.pc = read_sysreg_el2(SYS_ELR);
- ctxt->regs.pstate = read_sysreg_el2(SYS_SPSR);
+ /*
+ * Guest PSTATE gets saved at guest fixup time in all
+ * cases. We still need to handle the nVHE host side here.
+ */
+ if (!has_vhe() && ctxt->__hyp_running_vcpu)
+ ctxt->regs.pstate = read_sysreg_el2(SYS_SPSR);
if (cpus_have_final_cap(ARM64_HAS_RAS_EXTN))
ctxt_sys_reg(ctxt, DISR_EL1) = read_sysreg_s(SYS_VDISR_EL2);
--
2.33.0
next prev parent reply other threads:[~2021-12-06 21:13 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-06 21:12 [PATCH AUTOSEL 5.15 01/24] drm/msm: Fix null ptr access msm_ioctl_gem_submit() Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 02/24] drm/msm/a6xx: Fix uinitialized use of gpu_scid Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 03/24] drm/msm/dsi: set default num_data_lanes Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 04/24] drm/msm/dp: Avoid unpowered AUX xfers that caused crashes Sasha Levin
2021-12-06 21:12 ` Sasha Levin [this message]
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 06/24] s390/test_unwind: use raw opcode instead of invalid instruction Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 07/24] Revert "tty: serial: fsl_lpuart: drop earlycon entry for i.MX8QXP" Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 08/24] USB: NO_LPM quirk Lenovo Powered USB-C Travel Hub Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 09/24] net/mlx4_en: Update reported link modes for 1/10G Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 10/24] loop: Use pr_warn_once() for loop_control_remove() warning Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 11/24] ALSA: hda: Add Intel DG2 PCI ID and HDMI codec vid Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 12/24] ALSA: hda/hdmi: fix HDA codec entry table order for ADL-P Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 13/24] tools: Fix math.h breakage Sasha Levin
2021-12-06 21:19 ` Matthew Wilcox
2021-12-13 17:10 ` Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 14/24] parisc/agp: Annotate parisc agp init functions with __init Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 15/24] i2c: rk3x: Handle a spurious start completion interrupt flag Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 16/24] net: netlink: af_netlink: Prevent empty skb by adding a check on len Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 17/24] drm/amdgpu: cancel the correct hrtimer on exit Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 18/24] drm/amdgpu: check atomic flag to differeniate with legacy path Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 19/24] drm/amd/display: Fix for the no Audio bug with Tiled Displays Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 20/24] drm/amdkfd: fix double free mem structure Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 21/24] drm/amd/display: add connector type check for CRC source set Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 22/24] drm/amdkfd: process_info lock not needed for svm Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 23/24] tracing: Fix a kmemleak false positive in tracing_map Sasha Levin
2021-12-06 21:12 ` [PATCH AUTOSEL 5.15 24/24] fget: check that the fd still exists after getting a ref to it Sasha Levin
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