From: Marc Zyngier <marc.zyngier@arm.com> To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu Cc: Russell King <linux@arm.linux.org.uk>, Ard Biesheuvel <ard.biesheuvel@linaro.org>, Catalin Marinas <catalin.marinas@arm.com>, Keerthy <j-keerthy@ti.com> Subject: [PATCH v4 15/28] ARM: Expose the VA/IDMAP offset Date: Tue, 21 Mar 2017 19:20:45 +0000 [thread overview] Message-ID: <20170321192058.9300-16-marc.zyngier@arm.com> (raw) In-Reply-To: <20170321192058.9300-1-marc.zyngier@arm.com> The KVM code needs to be able to compute the address of symbols in its idmap page (the equivalent of a virt_to_idmap() call). Unfortunately, virt_to_idmap is slightly complicated, depending on the use of arch_phys_to_idmap_offset or not, and none of that is readily available at HYP. Instead, expose a single kimage_voffset variable which contains the offset between a kernel VA and its idmap address, enabling the VA->IDMAP conversion. This allows the KVM code to behave similarily to its arm64 counterpart. Tested-by: Keerthy <j-keerthy@ti.com> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- arch/arm/mm/mmu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 4e016d7f37b3..e98a2b5c4e85 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -87,6 +87,8 @@ struct cachepolicy { #define s2_policy(policy) 0 #endif +unsigned long kimage_voffset __ro_after_init; + static struct cachepolicy cache_policies[] __initdata = { { .policy = "uncached", @@ -1635,4 +1637,7 @@ void __init paging_init(const struct machine_desc *mdesc) empty_zero_page = virt_to_page(zero_page); __flush_dcache_page(NULL, empty_zero_page); + + /* Compute the virt/idmap offset, mostly for the sake of KVM */ + kimage_voffset = (unsigned long)&kimage_voffset - virt_to_idmap(&kimage_voffset); } -- 2.11.0
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From: marc.zyngier@arm.com (Marc Zyngier) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 15/28] ARM: Expose the VA/IDMAP offset Date: Tue, 21 Mar 2017 19:20:45 +0000 [thread overview] Message-ID: <20170321192058.9300-16-marc.zyngier@arm.com> (raw) In-Reply-To: <20170321192058.9300-1-marc.zyngier@arm.com> The KVM code needs to be able to compute the address of symbols in its idmap page (the equivalent of a virt_to_idmap() call). Unfortunately, virt_to_idmap is slightly complicated, depending on the use of arch_phys_to_idmap_offset or not, and none of that is readily available at HYP. Instead, expose a single kimage_voffset variable which contains the offset between a kernel VA and its idmap address, enabling the VA->IDMAP conversion. This allows the KVM code to behave similarily to its arm64 counterpart. Tested-by: Keerthy <j-keerthy@ti.com> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- arch/arm/mm/mmu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 4e016d7f37b3..e98a2b5c4e85 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -87,6 +87,8 @@ struct cachepolicy { #define s2_policy(policy) 0 #endif +unsigned long kimage_voffset __ro_after_init; + static struct cachepolicy cache_policies[] __initdata = { { .policy = "uncached", @@ -1635,4 +1637,7 @@ void __init paging_init(const struct machine_desc *mdesc) empty_zero_page = virt_to_page(zero_page); __flush_dcache_page(NULL, empty_zero_page); + + /* Compute the virt/idmap offset, mostly for the sake of KVM */ + kimage_voffset = (unsigned long)&kimage_voffset - virt_to_idmap(&kimage_voffset); } -- 2.11.0
next prev parent reply other threads:[~2017-03-21 19:20 UTC|newest] Thread overview: 112+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-03-21 19:20 [PATCH v4 00/28] arm/arm64: KVM: Rework the hyp-stub API Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 01/28] arm64: hyp-stub: Stop pointlessly clobbering lr Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 02/28] arm64: KVM: Move lr save/restore to do_el2_call Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-23 11:57 ` Marc Zyngier 2017-03-23 11:57 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 03/28] arm64: hyp-stub: Don't save lr in the EL1 code Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 04/28] arm64: hyp-stub: Implement HVC_RESET_VECTORS stub hypercall Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 05/28] arm64: KVM: Implement HVC_RESET_VECTORS stub hypercall in the init code Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:45 ` Marc Zyngier 2017-03-24 14:45 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 06/28] arm64: KVM: Implement HVC_GET_VECTORS " Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 07/28] arm64: KVM: Allow the main HYP code to use the init hyp stub implementation Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:56 ` Marc Zyngier 2017-03-24 14:56 ` Marc Zyngier 2017-04-03 17:28 ` Christoffer Dall 2017-04-03 17:28 ` Christoffer Dall 2017-03-21 19:20 ` [PATCH v4 08/28] arm64: KVM: Convert __cpu_reset_hyp_mode to using __hyp_reset_vectors Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 09/28] arm64: KVM: Implement HVC_SOFT_RESTART in the init code Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 10/28] ARM: hyp-stub: improve ABI Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 11/28] ARM: soft-reboot into same mode that we entered the kernel Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 12/28] ARM: KVM: Convert KVM to use HVC_GET_VECTORS Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 13/28] ARM: Update cpu_v7_reset documentation Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 14/28] ARM: hyp-stub: Use r1 for the soft-restart address Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier [this message] 2017-03-21 19:20 ` [PATCH v4 15/28] ARM: Expose the VA/IDMAP offset Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 16/28] ARM: hyp-stub: Implement HVC_RESET_VECTORS stub hypercall Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 17/28] ARM: KVM: Implement HVC_RESET_VECTORS stub hypercall in the init code Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 18/28] ARM: KVM: Implement HVC_GET_VECTORS " Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 19/28] ARM: KVM: Allow the main HYP code to use the init hyp stub implementation Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-24 14:34 ` Christoffer Dall 2017-03-24 14:34 ` Christoffer Dall 2017-03-24 15:01 ` Marc Zyngier 2017-03-24 15:01 ` Marc Zyngier 2017-04-03 17:32 ` Christoffer Dall 2017-04-03 17:32 ` Christoffer Dall 2017-04-03 17:51 ` Marc Zyngier 2017-04-03 17:51 ` Marc Zyngier 2017-04-04 7:36 ` Christoffer Dall 2017-04-04 7:36 ` Christoffer Dall 2017-03-21 19:20 ` [PATCH v4 20/28] ARM: KVM: Convert __cpu_reset_hyp_mode to using __hyp_reset_vectors Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 21/28] ARM: KVM: Implement HVC_SOFT_RESTART in the init code Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 22/28] arm/arm64: KVM: Use __hyp_reset_vectors() directly Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 23/28] arm/arm64: KVM: Remove kvm_get_idmap_start Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 24/28] arm/arm64: KVM: Use HVC_RESET_VECTORS to reinit HYP mode Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 25/28] ARM: decompressor: Remove __hyp_get_vectors usage Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-24 14:34 ` Christoffer Dall 2017-03-24 14:34 ` Christoffer Dall 2017-03-24 15:26 ` Marc Zyngier 2017-03-24 15:26 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 26/28] ARM: hyp-stub/KVM: Kill __hyp_get_vectors Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 27/28] arm64: " Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-21 19:20 ` [PATCH v4 28/28] arm/arm64: Add hyp-stub API documentation Marc Zyngier 2017-03-21 19:20 ` Marc Zyngier 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:33 ` Christoffer Dall 2017-03-24 14:42 ` Marc Zyngier 2017-03-24 14:42 ` Marc Zyngier 2017-03-24 15:23 ` Christoffer Dall 2017-03-24 15:23 ` Christoffer Dall 2017-03-24 15:57 ` Marc Zyngier 2017-03-24 15:57 ` Marc Zyngier 2017-03-24 16:03 ` Christoffer Dall 2017-03-24 16:03 ` Christoffer Dall 2017-03-22 13:37 ` [PATCH v4 00/28] arm/arm64: KVM: Rework the hyp-stub API Christoffer Dall 2017-03-22 13:37 ` Christoffer Dall 2017-03-22 16:14 ` Marc Zyngier 2017-03-22 16:14 ` Marc Zyngier 2017-03-22 17:27 ` Christoffer Dall 2017-03-22 17:27 ` Christoffer Dall 2017-03-23 10:53 ` Marc Zyngier 2017-03-23 10:53 ` Marc Zyngier 2017-03-23 14:39 ` Christoffer Dall 2017-03-23 14:39 ` Christoffer Dall 2017-03-23 15:16 ` Marc Zyngier 2017-03-23 15:16 ` Marc Zyngier 2017-03-23 15:45 ` Christoffer Dall 2017-03-23 15:45 ` Christoffer Dall 2017-03-22 16:20 ` Catalin Marinas 2017-03-22 16:20 ` Catalin Marinas 2017-03-24 14:36 ` Christoffer Dall 2017-03-24 14:36 ` Christoffer Dall
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