linux-kernel - [RFC V3 PATCH 3/6] selftests: kvm: ucall: Allow querying ucall pool gpa

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Date:   Fri, 19 Aug 2022 17:46:56 +0000
From:   Vishal Annapurve <vannapurve@...gle.com>
To:     x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Cc:     pbonzini@...hat.com, vkuznets@...hat.com, wanpengli@...cent.com,
        jmattson@...gle.com, joro@...tes.org, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, shuah@...nel.org, yang.zhong@...el.com,
        drjones@...hat.com, ricarkol@...gle.com, aaronlewis@...gle.com,
        wei.w.wang@...el.com, kirill.shutemov@...ux.intel.com,
        corbet@....net, hughd@...gle.com, jlayton@...nel.org,
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        chao.p.peng@...ux.intel.com, yu.c.zhang@...ux.intel.com,
        jun.nakajima@...el.com, dave.hansen@...el.com,
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        axelrasmussen@...gle.com, maciej.szmigiero@...cle.com,
        mizhang@...gle.com, bgardon@...gle.com,
        Vishal Annapurve <vannapurve@...gle.com>
Subject: [RFC V3 PATCH 3/6] selftests: kvm: ucall: Allow querying ucall pool gpa

Add a helper to query guest physical address for ucall pool
so that guest can mark the page as accessed shared or private.

Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
---
 tools/testing/selftests/kvm/include/ucall_common.h |  2 ++
 tools/testing/selftests/kvm/lib/ucall_common.c     | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/ucall_common.h b/tools/testing/selftests/kvm/include/ucall_common.h
index 279bbab011c7..2c6e5c4df012 100644
--- a/tools/testing/selftests/kvm/include/ucall_common.h
+++ b/tools/testing/selftests/kvm/include/ucall_common.h
@@ -31,6 +31,8 @@ void ucall_arch_uninit(struct kvm_vm *vm);
 void ucall_arch_do_ucall(vm_vaddr_t uc);
 void *ucall_arch_get_ucall(struct kvm_vcpu *vcpu);
 
+vm_paddr_t get_ucall_pool_paddr(void);
+
 void ucall(uint64_t cmd, int nargs, ...);
 uint64_t get_ucall(struct kvm_vcpu *vcpu, struct ucall *uc);
 
diff --git a/tools/testing/selftests/kvm/lib/ucall_common.c b/tools/testing/selftests/kvm/lib/ucall_common.c
index 5a15fa39cd51..4d2abef8ee77 100644
--- a/tools/testing/selftests/kvm/lib/ucall_common.c
+++ b/tools/testing/selftests/kvm/lib/ucall_common.c
@@ -11,6 +11,7 @@ struct ucall_header {
 
 static bool use_ucall_pool;
 static struct ucall_header *ucall_pool;
+static vm_paddr_t ucall_page_paddr;
 
 void ucall_init(struct kvm_vm *vm, void *arg)
 {
@@ -35,7 +36,10 @@ void ucall_init(struct kvm_vm *vm, void *arg)
 	}
 
 	ucall_pool = (struct ucall_header *)vaddr;
+	ucall_page_paddr = addr_gva2gpa(vm, vaddr);
 	sync_global_to_guest(vm, ucall_pool);
+	sync_global_to_guest(vm, ucall_page_paddr);
+	printf("ucall_page_paddr 0x%lx\n", ucall_page_paddr);
 
 out:
 	ucall_arch_init(vm, arg);
@@ -54,6 +58,14 @@ void ucall_uninit(struct kvm_vm *vm)
 	ucall_arch_uninit(vm);
 }
 
+vm_paddr_t get_ucall_pool_paddr(void)
+{
+	if (!use_ucall_pool)
+		return 0;
+
+	return ucall_page_paddr;
+}
+
 static struct ucall *ucall_alloc(void)
 {
 	struct ucall *uc = NULL;
-- 
2.37.1.595.g718a3a8f04-goog