From 93de2a6a4b91b72607136dd656edf03fb399d27f Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Wed, 23 Sep 2026 09:37:21 -0700 Subject: KVM: SEV: Do cache maintenance on the source VM during intra-host migration Manually perform cache maintenance on the source VM during intra-host migration to ensure no stale data is left in CPU caches after the VM is destroyed. Because the source VM is "converted" to a non-SEV VM, KVM's memory reclaim flows won't trigger cache maintenance, e.g. when all guest memory is reclaimed in response to detaching from the mmu_notifier. Note, relying on the destination VM to do cache maintenance isn't an option as KVM doesn't require identical guest memory configurations, i.e. the source VM may have access to memory that the destination VM does not. Enforcing equivalent memory configurations is infeasible, as it would require a *deep* comparison of memslots, e.g. to verify that not only are the memslot identical, but what the memslots point at is also identical. Fixes: b56639318bb2 ("KVM: SEV: Add support for SEV intra host migration") Cc: stable@vger.kernel.org Reported-by: Stefan Teodorescu Signed-off-by: Sean Christopherson Message-ID: <20260923163721.1584779-3-seanjc@google.com> Signed-off-by: Paolo Bonzini --- drivers/clk/ti/interface.c | 142 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) create mode 100644 drivers/clk/ti/interface.c (limited to 'drivers/clk/ti/interface.c') diff --git a/drivers/clk/ti/interface.c b/drivers/clk/ti/interface.c new file mode 100644 index 000000000..039c8075e --- /dev/null +++ b/drivers/clk/ti/interface.c @@ -0,0 +1,142 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * OMAP interface clock support + * + * Copyright (C) 2013 Texas Instruments, Inc. + * + * Tero Kristo + */ + +#include +#include +#include +#include +#include +#include "clock.h" + +#undef pr_fmt +#define pr_fmt(fmt) "%s: " fmt, __func__ + +static const struct clk_ops ti_interface_clk_ops = { + .init = &omap2_init_clk_clkdm, + .enable = &omap2_dflt_clk_enable, + .disable = &omap2_dflt_clk_disable, + .is_enabled = &omap2_dflt_clk_is_enabled, +}; + +static struct clk *_register_interface(struct device_node *node, + const char *name, + const char *parent_name, + struct clk_omap_reg *reg, u8 bit_idx, + const struct clk_hw_omap_ops *ops) +{ + struct clk_init_data init = { NULL }; + struct clk_hw_omap *clk_hw; + struct clk *clk; + + clk_hw = kzalloc_obj(*clk_hw); + if (!clk_hw) + return ERR_PTR(-ENOMEM); + + clk_hw->hw.init = &init; + clk_hw->ops = ops; + memcpy(&clk_hw->enable_reg, reg, sizeof(*reg)); + clk_hw->enable_bit = bit_idx; + + init.name = name; + init.ops = &ti_interface_clk_ops; + init.flags = 0; + + init.num_parents = 1; + init.parent_names = &parent_name; + + clk = of_ti_clk_register_omap_hw(node, &clk_hw->hw, name); + + if (IS_ERR(clk)) + kfree(clk_hw); + + return clk; +} + +static void __init _of_ti_interface_clk_setup(struct device_node *node, + const struct clk_hw_omap_ops *ops) +{ + struct clk *clk; + const char *parent_name; + struct clk_omap_reg reg; + u8 enable_bit = 0; + const char *name; + + if (ti_clk_get_reg_addr(node, 0, ®)) + return; + + enable_bit = reg.bit; + + parent_name = of_clk_get_parent_name(node, 0); + if (!parent_name) { + pr_err("%pOFn must have a parent\n", node); + return; + } + + name = ti_dt_clk_name(node); + clk = _register_interface(node, name, parent_name, ®, + enable_bit, ops); + + if (!IS_ERR(clk)) + of_clk_add_provider(node, of_clk_src_simple_get, clk); +} + +static void __init of_ti_interface_clk_setup(struct device_node *node) +{ + _of_ti_interface_clk_setup(node, &clkhwops_iclk_wait); +} +CLK_OF_DECLARE(ti_interface_clk, "ti,omap3-interface-clock", + of_ti_interface_clk_setup); + +static void __init of_ti_no_wait_interface_clk_setup(struct device_node *node) +{ + _of_ti_interface_clk_setup(node, &clkhwops_iclk); +} +CLK_OF_DECLARE(ti_no_wait_interface_clk, "ti,omap3-no-wait-interface-clock", + of_ti_no_wait_interface_clk_setup); + +#ifdef CONFIG_ARCH_OMAP3 +static void __init of_ti_hsotgusb_interface_clk_setup(struct device_node *node) +{ + _of_ti_interface_clk_setup(node, + &clkhwops_omap3430es2_iclk_hsotgusb_wait); +} +CLK_OF_DECLARE(ti_hsotgusb_interface_clk, "ti,omap3-hsotgusb-interface-clock", + of_ti_hsotgusb_interface_clk_setup); + +static void __init of_ti_dss_interface_clk_setup(struct device_node *node) +{ + _of_ti_interface_clk_setup(node, + &clkhwops_omap3430es2_iclk_dss_usbhost_wait); +} +CLK_OF_DECLARE(ti_dss_interface_clk, "ti,omap3-dss-interface-clock", + of_ti_dss_interface_clk_setup); + +static void __init of_ti_ssi_interface_clk_setup(struct device_node *node) +{ + _of_ti_interface_clk_setup(node, &clkhwops_omap3430es2_iclk_ssi_wait); +} +CLK_OF_DECLARE(ti_ssi_interface_clk, "ti,omap3-ssi-interface-clock", + of_ti_ssi_interface_clk_setup); + +static void __init of_ti_am35xx_interface_clk_setup(struct device_node *node) +{ + _of_ti_interface_clk_setup(node, &clkhwops_am35xx_ipss_wait); +} +CLK_OF_DECLARE(ti_am35xx_interface_clk, "ti,am35xx-interface-clock", + of_ti_am35xx_interface_clk_setup); +#endif + +#ifdef CONFIG_SOC_OMAP2430 +static void __init of_ti_omap2430_interface_clk_setup(struct device_node *node) +{ + _of_ti_interface_clk_setup(node, &clkhwops_omap2430_i2chs_wait); +} +CLK_OF_DECLARE(ti_omap2430_interface_clk, "ti,omap2430-interface-clock", + of_ti_omap2430_interface_clk_setup); +#endif -- cgit v1.3.1