diff options
Diffstat (limited to '0046-x86-paging-Delete-update_cr3-s-do_locking-parameter.patch')
| -rw-r--r-- | 0046-x86-paging-Delete-update_cr3-s-do_locking-parameter.patch | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/0046-x86-paging-Delete-update_cr3-s-do_locking-parameter.patch b/0046-x86-paging-Delete-update_cr3-s-do_locking-parameter.patch deleted file mode 100644 index ce397a1..0000000 --- a/0046-x86-paging-Delete-update_cr3-s-do_locking-parameter.patch +++ /dev/null @@ -1,161 +0,0 @@ -From bf70ce8b3449c49eb828d5b1f4934a49b00fef35 Mon Sep 17 00:00:00 2001 -From: Andrew Cooper <andrew.cooper3@citrix.com> -Date: Wed, 20 Sep 2023 20:06:53 +0100 -Subject: [PATCH 46/67] x86/paging: Delete update_cr3()'s do_locking parameter - -Nicola reports that the XSA-438 fix introduced new MISRA violations because of -some incidental tidying it tried to do. The parameter is useless, so resolve -the MISRA regression by removing it. - -hap_update_cr3() discards the parameter entirely, while sh_update_cr3() uses -it to distinguish internal and external callers and therefore whether the -paging lock should be taken. - -However, we have paging_lock_recursive() for this purpose, which also avoids -the ability for the shadow internal callers to accidentally not hold the lock. - -Fixes: fb0ff49fe9f7 ("x86/shadow: defer releasing of PV's top-level shadow reference") -Reported-by: Nicola Vetrini <nicola.vetrini@bugseng.com> -Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> -Reviewed-by: Jan Beulich <jbeulich@suse.com> -Release-acked-by: Henry Wang <Henry.Wang@arm.com> -(cherry picked from commit e71157d1ac2a7fbf413130663cf0a93ff9fbcf7e) ---- - xen/arch/x86/include/asm/paging.h | 5 ++--- - xen/arch/x86/mm/hap/hap.c | 5 ++--- - xen/arch/x86/mm/shadow/common.c | 2 +- - xen/arch/x86/mm/shadow/multi.c | 17 ++++++++--------- - xen/arch/x86/mm/shadow/none.c | 3 +-- - 5 files changed, 14 insertions(+), 18 deletions(-) - -diff --git a/xen/arch/x86/include/asm/paging.h b/xen/arch/x86/include/asm/paging.h -index 94c590f31a..809ff35d9a 100644 ---- a/xen/arch/x86/include/asm/paging.h -+++ b/xen/arch/x86/include/asm/paging.h -@@ -138,8 +138,7 @@ struct paging_mode { - paddr_t ga, uint32_t *pfec, - unsigned int *page_order); - #endif -- pagetable_t (*update_cr3 )(struct vcpu *v, bool do_locking, -- bool noflush); -+ pagetable_t (*update_cr3 )(struct vcpu *v, bool noflush); - void (*update_paging_modes )(struct vcpu *v); - bool (*flush_tlb )(const unsigned long *vcpu_bitmap); - -@@ -312,7 +311,7 @@ static inline unsigned long paging_ga_to_gfn_cr3(struct vcpu *v, - * as the value to load into the host CR3 to schedule this vcpu */ - static inline pagetable_t paging_update_cr3(struct vcpu *v, bool noflush) - { -- return paging_get_hostmode(v)->update_cr3(v, 1, noflush); -+ return paging_get_hostmode(v)->update_cr3(v, noflush); - } - - /* Update all the things that are derived from the guest's CR0/CR3/CR4. -diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c -index 57a19c3d59..3ad39a7dd7 100644 ---- a/xen/arch/x86/mm/hap/hap.c -+++ b/xen/arch/x86/mm/hap/hap.c -@@ -739,8 +739,7 @@ static bool cf_check hap_invlpg(struct vcpu *v, unsigned long linear) - return 1; - } - --static pagetable_t cf_check hap_update_cr3( -- struct vcpu *v, bool do_locking, bool noflush) -+static pagetable_t cf_check hap_update_cr3(struct vcpu *v, bool noflush) - { - v->arch.hvm.hw_cr[3] = v->arch.hvm.guest_cr[3]; - hvm_update_guest_cr3(v, noflush); -@@ -826,7 +825,7 @@ static void cf_check hap_update_paging_modes(struct vcpu *v) - } - - /* CR3 is effectively updated by a mode change. Flush ASIDs, etc. */ -- hap_update_cr3(v, 0, false); -+ hap_update_cr3(v, false); - - unlock: - paging_unlock(d); -diff --git a/xen/arch/x86/mm/shadow/common.c b/xen/arch/x86/mm/shadow/common.c -index c0940f939e..18714dbd02 100644 ---- a/xen/arch/x86/mm/shadow/common.c -+++ b/xen/arch/x86/mm/shadow/common.c -@@ -2579,7 +2579,7 @@ static void sh_update_paging_modes(struct vcpu *v) - } - #endif /* OOS */ - -- v->arch.paging.mode->update_cr3(v, 0, false); -+ v->arch.paging.mode->update_cr3(v, false); - } - - void cf_check shadow_update_paging_modes(struct vcpu *v) -diff --git a/xen/arch/x86/mm/shadow/multi.c b/xen/arch/x86/mm/shadow/multi.c -index c92b354a78..e54a507b54 100644 ---- a/xen/arch/x86/mm/shadow/multi.c -+++ b/xen/arch/x86/mm/shadow/multi.c -@@ -2506,7 +2506,7 @@ static int cf_check sh_page_fault( - * In any case, in the PAE case, the ASSERT is not true; it can - * happen because of actions the guest is taking. */ - #if GUEST_PAGING_LEVELS == 3 -- v->arch.paging.mode->update_cr3(v, 0, false); -+ v->arch.paging.mode->update_cr3(v, false); - #else - ASSERT(d->is_shutting_down); - #endif -@@ -3224,17 +3224,13 @@ static void cf_check sh_detach_old_tables(struct vcpu *v) - } - } - --static pagetable_t cf_check sh_update_cr3(struct vcpu *v, bool do_locking, -- bool noflush) -+static pagetable_t cf_check sh_update_cr3(struct vcpu *v, bool noflush) - /* Updates vcpu->arch.cr3 after the guest has changed CR3. - * Paravirtual guests should set v->arch.guest_table (and guest_table_user, - * if appropriate). - * HVM guests should also make sure hvm_get_guest_cntl_reg(v, 3) works; - * this function will call hvm_update_guest_cr(v, 3) to tell them where the - * shadow tables are. -- * If do_locking != 0, assume we are being called from outside the -- * shadow code, and must take and release the paging lock; otherwise -- * that is the caller's responsibility. - */ - { - struct domain *d = v->domain; -@@ -3252,7 +3248,11 @@ static pagetable_t cf_check sh_update_cr3(struct vcpu *v, bool do_locking, - return old_entry; - } - -- if ( do_locking ) paging_lock(v->domain); -+ /* -+ * This is used externally (with the paging lock not taken) and internally -+ * by the shadow code (with the lock already taken). -+ */ -+ paging_lock_recursive(v->domain); - - #if (SHADOW_OPTIMIZATIONS & SHOPT_OUT_OF_SYNC) - /* Need to resync all the shadow entries on a TLB flush. Resync -@@ -3480,8 +3480,7 @@ static pagetable_t cf_check sh_update_cr3(struct vcpu *v, bool do_locking, - shadow_sync_other_vcpus(v); - #endif - -- /* Release the lock, if we took it (otherwise it's the caller's problem) */ -- if ( do_locking ) paging_unlock(v->domain); -+ paging_unlock(v->domain); - - return old_entry; - } -diff --git a/xen/arch/x86/mm/shadow/none.c b/xen/arch/x86/mm/shadow/none.c -index 743c0ffb85..7e4e386cd0 100644 ---- a/xen/arch/x86/mm/shadow/none.c -+++ b/xen/arch/x86/mm/shadow/none.c -@@ -52,8 +52,7 @@ static unsigned long cf_check _gva_to_gfn( - } - #endif - --static pagetable_t cf_check _update_cr3(struct vcpu *v, bool do_locking, -- bool noflush) -+static pagetable_t cf_check _update_cr3(struct vcpu *v, bool noflush) - { - ASSERT_UNREACHABLE(); - return pagetable_null(); --- -2.44.0 - |